initial commit, 4.5 stable

editor/import/3d/collada.h

@@ -0,0 +1,546 @@
+/**************************************************************************/
+/*  collada.h                                                             */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "core/io/xml_parser.h"
+
+class Collada {
+public:
+	enum ImportFlags {
+		IMPORT_FLAG_SCENE = 1,
+		IMPORT_FLAG_ANIMATION = 2
+	};
+
+	struct Image {
+		String path;
+	};
+
+	struct Material {
+		String name;
+		String instance_effect;
+	};
+
+	struct Effect {
+		String name;
+		HashMap<String, Variant> params;
+
+		struct Channel {
+			int uv_idx = 0;
+			String texture;
+			Color color;
+		};
+
+		Channel diffuse, specular, emission, bump;
+		float shininess = 40;
+		bool found_double_sided = false;
+		bool double_sided = true;
+		bool unshaded = false;
+
+		String get_texture_path(const String &p_source, Collada &p_state) const;
+
+		Effect() {
+			diffuse.color = Color(1, 1, 1, 1);
+		}
+	};
+
+	struct CameraData {
+		enum Mode {
+			MODE_PERSPECTIVE,
+			MODE_ORTHOGONAL
+		};
+
+		Mode mode = MODE_PERSPECTIVE;
+
+		union {
+			struct {
+				float x_fov = 0;
+				float y_fov = 0;
+			} perspective;
+			struct {
+				float x_mag = 0;
+				float y_mag = 0;
+			} orthogonal;
+		};
+
+		float aspect = 1;
+		float z_near = 0.05;
+		float z_far = 4000;
+
+		CameraData() {}
+	};
+
+	struct LightData {
+		enum Mode {
+			MODE_AMBIENT,
+			MODE_DIRECTIONAL,
+			MODE_OMNI,
+			MODE_SPOT
+		};
+
+		Mode mode = MODE_AMBIENT;
+
+		Color color = Color(1, 1, 1, 1);
+
+		float constant_att = 0;
+		float linear_att = 0;
+		float quad_att = 0;
+
+		float spot_angle = 45;
+		float spot_exp = 1;
+	};
+
+	struct MeshData {
+		String name;
+		struct Source {
+			Vector<float> array;
+			int stride = 0;
+		};
+
+		HashMap<String, Source> sources;
+
+		struct Vertices {
+			HashMap<String, String> sources;
+		};
+
+		HashMap<String, Vertices> vertices;
+
+		struct Primitives {
+			struct SourceRef {
+				String source;
+				int offset = 0;
+			};
+
+			String material;
+			HashMap<String, SourceRef> sources;
+			Vector<float> polygons;
+			Vector<float> indices;
+			int count = 0;
+			int vertex_size = 0;
+		};
+
+		Vector<Primitives> primitives;
+
+		bool found_double_sided = false;
+		bool double_sided = true;
+	};
+
+	struct CurveData {
+		String name;
+		bool closed = false;
+
+		struct Source {
+			Vector<String> sarray;
+			Vector<float> array;
+			int stride = 0;
+		};
+
+		HashMap<String, Source> sources;
+
+		HashMap<String, String> control_vertices;
+	};
+
+	struct SkinControllerData {
+		String base;
+		bool use_idrefs = false;
+
+		Transform3D bind_shape;
+
+		struct Source {
+			Vector<String> sarray; //maybe for names
+			Vector<float> array;
+			int stride = 1;
+		};
+
+		HashMap<String, Source> sources;
+
+		struct Joints {
+			HashMap<String, String> sources;
+		} joints;
+
+		struct Weights {
+			struct SourceRef {
+				String source;
+				int offset = 0;
+			};
+
+			String material;
+			HashMap<String, SourceRef> sources;
+			Vector<float> sets;
+			Vector<float> indices;
+			int count = 0;
+		} weights;
+
+		HashMap<String, Transform3D> bone_rest_map;
+	};
+
+	struct MorphControllerData {
+		String mesh;
+		String mode;
+
+		struct Source {
+			int stride = 1;
+			Vector<String> sarray; //maybe for names
+			Vector<float> array;
+		};
+
+		HashMap<String, Source> sources;
+
+		HashMap<String, String> targets;
+	};
+
+	struct Vertex {
+		int idx = 0;
+		Vector3 vertex;
+		Vector3 normal;
+		Vector3 uv;
+		Vector3 uv2;
+		Plane tangent;
+		Color color;
+		int uid = 0;
+		struct Weight {
+			int bone_idx = 0;
+			float weight = 0;
+			bool operator<(const Weight w) const { return weight > w.weight; } //heaviest first
+		};
+
+		Vector<Weight> weights;
+
+		void fix_weights() {
+			weights.sort();
+			if (weights.size() > 4) {
+				//cap to 4 and make weights add up 1
+				weights.resize(4);
+				float total = 0;
+				for (int i = 0; i < 4; i++) {
+					total += weights[i].weight;
+				}
+				if (total) {
+					for (int i = 0; i < 4; i++) {
+						weights.write[i].weight /= total;
+					}
+				}
+			}
+		}
+
+		void fix_unit_scale(const Collada &p_state);
+
+		bool operator<(const Vertex &p_vert) const {
+			if (uid == p_vert.uid) {
+				if (vertex == p_vert.vertex) {
+					if (normal == p_vert.normal) {
+						if (uv == p_vert.uv) {
+							if (uv2 == p_vert.uv2) {
+								if (!weights.is_empty() || !p_vert.weights.is_empty()) {
+									if (weights.size() == p_vert.weights.size()) {
+										for (int i = 0; i < weights.size(); i++) {
+											if (weights[i].bone_idx != p_vert.weights[i].bone_idx) {
+												return weights[i].bone_idx < p_vert.weights[i].bone_idx;
+											}
+
+											if (weights[i].weight != p_vert.weights[i].weight) {
+												return weights[i].weight < p_vert.weights[i].weight;
+											}
+										}
+									} else {
+										return weights.size() < p_vert.weights.size();
+									}
+								}
+
+								return (color < p_vert.color);
+							} else {
+								return (uv2 < p_vert.uv2);
+							}
+						} else {
+							return (uv < p_vert.uv);
+						}
+					} else {
+						return (normal < p_vert.normal);
+					}
+				} else {
+					return vertex < p_vert.vertex;
+				}
+			} else {
+				return uid < p_vert.uid;
+			}
+		}
+	};
+
+	struct Node {
+		enum Type {
+			TYPE_NODE,
+			TYPE_JOINT,
+			TYPE_SKELETON, //this bone is not collada, it's added afterwards as optimization
+			TYPE_LIGHT,
+			TYPE_CAMERA,
+			TYPE_GEOMETRY
+		};
+
+		struct XForm {
+			enum Op {
+				OP_ROTATE,
+				OP_SCALE,
+				OP_TRANSLATE,
+				OP_MATRIX,
+				OP_VISIBILITY
+			};
+
+			String id;
+			Op op = OP_ROTATE;
+			Vector<float> data;
+		};
+
+		Type type = TYPE_NODE;
+
+		String name;
+		String id;
+		String empty_draw_type;
+		bool noname = false;
+		Vector<XForm> xform_list;
+		Transform3D default_transform;
+		Transform3D post_transform;
+		Vector<Node *> children;
+
+		Node *parent = nullptr;
+
+		Transform3D compute_transform(const Collada &p_state) const;
+		Transform3D get_global_transform() const;
+		Transform3D get_transform() const;
+
+		bool ignore_anim = false;
+
+		virtual ~Node() {
+			for (int i = 0; i < children.size(); i++) {
+				memdelete(children[i]);
+			}
+		}
+	};
+
+	struct NodeSkeleton : public Node {
+		NodeSkeleton() { type = TYPE_SKELETON; }
+	};
+
+	struct NodeJoint : public Node {
+		NodeSkeleton *owner = nullptr;
+		String sid;
+		NodeJoint() {
+			type = TYPE_JOINT;
+		}
+	};
+
+	struct NodeGeometry : public Node {
+		bool controller = false;
+		String source;
+
+		struct Material {
+			String target;
+		};
+
+		HashMap<String, Material> material_map;
+		Vector<String> skeletons;
+
+		NodeGeometry() { type = TYPE_GEOMETRY; }
+	};
+
+	struct NodeCamera : public Node {
+		String camera;
+
+		NodeCamera() { type = TYPE_CAMERA; }
+	};
+
+	struct NodeLight : public Node {
+		String light;
+
+		NodeLight() { type = TYPE_LIGHT; }
+	};
+
+	struct VisualScene {
+		String name;
+		Vector<Node *> root_nodes;
+
+		~VisualScene() {
+			for (int i = 0; i < root_nodes.size(); i++) {
+				memdelete(root_nodes[i]);
+			}
+		}
+	};
+
+	struct AnimationClip {
+		String name;
+		float begin = 0;
+		float end = 1;
+		Vector<String> tracks;
+	};
+
+	struct AnimationTrack {
+		String id;
+		String target;
+		String param;
+		String component;
+		bool property = false;
+
+		enum InterpolationType {
+			INTERP_LINEAR,
+			INTERP_BEZIER
+		};
+
+		struct Key {
+			enum Type {
+				TYPE_FLOAT,
+				TYPE_MATRIX
+			};
+
+			float time = 0;
+			Vector<float> data;
+			Point2 in_tangent;
+			Point2 out_tangent;
+			InterpolationType interp_type = INTERP_LINEAR;
+		};
+
+		Vector<float> get_value_at_time(float p_time) const;
+
+		Vector<Key> keys;
+	};
+
+	/****************/
+	/* IMPORT STATE */
+	/****************/
+
+	struct State {
+		int import_flags = 0;
+
+		float unit_scale = 1.0;
+		Vector3::Axis up_axis = Vector3::AXIS_Y;
+		bool z_up = false;
+
+		struct Version {
+			int major = 0, minor = 0, rev = 0;
+
+			bool operator<(const Version &p_ver) const { return (major == p_ver.major) ? ((minor == p_ver.minor) ? (rev < p_ver.rev) : minor < p_ver.minor) : major < p_ver.major; }
+			Version(int p_major = 0, int p_minor = 0, int p_rev = 0) {
+				major = p_major;
+				minor = p_minor;
+				rev = p_rev;
+			}
+		} version;
+
+		HashMap<String, CameraData> camera_data_map;
+		HashMap<String, MeshData> mesh_data_map;
+		HashMap<String, LightData> light_data_map;
+		HashMap<String, CurveData> curve_data_map;
+
+		HashMap<String, String> mesh_name_map;
+		HashMap<String, String> morph_name_map;
+		HashMap<String, String> morph_ownership_map;
+		HashMap<String, SkinControllerData> skin_controller_data_map;
+		HashMap<String, MorphControllerData> morph_controller_data_map;
+
+		HashMap<String, Image> image_map;
+		HashMap<String, Material> material_map;
+		HashMap<String, Effect> effect_map;
+
+		HashMap<String, VisualScene> visual_scene_map;
+		HashMap<String, Node *> scene_map;
+		HashSet<String> idref_joints;
+		HashMap<String, String> sid_to_node_map;
+		//RBMap<String,NodeJoint*> bone_map;
+
+		HashMap<String, Transform3D> bone_rest_map;
+
+		String local_path;
+		String root_visual_scene;
+		String root_physics_scene;
+
+		Vector<AnimationClip> animation_clips;
+		Vector<AnimationTrack> animation_tracks;
+		HashMap<String, Vector<int>> referenced_tracks;
+		HashMap<String, Vector<int>> by_id_tracks;
+
+		float animation_length = 0;
+	} state;
+
+	Error load(const String &p_path, int p_flags = 0);
+
+	Transform3D fix_transform(const Transform3D &p_transform);
+
+	Transform3D get_root_transform() const;
+
+	int get_uv_channel(const String &p_name);
+
+private: // private stuff
+	HashMap<String, int> channel_map;
+
+	void _parse_asset(XMLParser &p_parser);
+	void _parse_image(XMLParser &p_parser);
+	void _parse_material(XMLParser &p_parser);
+	void _parse_effect_material(XMLParser &p_parser, Effect &p_effect, String &p_id);
+	void _parse_effect(XMLParser &p_parser);
+	void _parse_camera(XMLParser &p_parser);
+	void _parse_light(XMLParser &p_parser);
+	void _parse_animation_clip(XMLParser &p_parser);
+
+	void _parse_mesh_geometry(XMLParser &p_parser, const String &p_id, const String &p_name);
+	void _parse_curve_geometry(XMLParser &p_parser, const String &p_id, const String &p_name);
+
+	void _parse_skin_controller(XMLParser &p_parser, const String &p_id);
+	void _parse_morph_controller(XMLParser &p_parser, const String &p_id);
+	void _parse_controller(XMLParser &p_parser);
+
+	Node *_parse_visual_instance_geometry(XMLParser &p_parser);
+	Node *_parse_visual_instance_camera(XMLParser &p_parser);
+	Node *_parse_visual_instance_light(XMLParser &p_parser);
+
+	Node *_parse_visual_node_instance_data(XMLParser &p_parser);
+	Node *_parse_visual_scene_node(XMLParser &p_parser);
+	void _parse_visual_scene(XMLParser &p_parser);
+
+	void _parse_animation(XMLParser &p_parser);
+	void _parse_scene(XMLParser &p_parser);
+	void _parse_library(XMLParser &p_parser);
+
+	Variant _parse_param(XMLParser &p_parser);
+	Vector<float> _read_float_array(XMLParser &p_parser);
+	Vector<String> _read_string_array(XMLParser &p_parser);
+	Transform3D _read_transform(XMLParser &p_parser);
+	String _read_empty_draw_type(XMLParser &p_parser);
+
+	void _joint_set_owner(Collada::Node *p_node, NodeSkeleton *p_owner);
+	void _create_skeletons(Collada::Node **p_node, NodeSkeleton *p_skeleton = nullptr);
+	void _find_morph_nodes(VisualScene *p_vscene, Node *p_node);
+	bool _remove_node(Node *p_parent, Node *p_node);
+	void _remove_node(VisualScene *p_vscene, Node *p_node);
+	void _merge_skeletons2(VisualScene *p_vscene);
+	void _merge_skeletons(VisualScene *p_vscene, Node *p_node);
+	bool _optimize_skeletons(VisualScene *p_vscene, Node *p_node);
+
+	bool _move_geometry_to_skeletons(VisualScene *p_vscene, Node *p_node, List<Node *> *p_mgeom);
+
+	void _optimize();
+};

editor/import/3d/editor_import_collada.h

@@ -0,0 +1,41 @@
+/**************************************************************************/
+/*  editor_import_collada.h                                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "editor/import/3d/resource_importer_scene.h"
+
+class EditorSceneFormatImporterCollada : public EditorSceneFormatImporter {
+	GDCLASS(EditorSceneFormatImporterCollada, EditorSceneFormatImporter);
+
+public:
+	virtual void get_extensions(List<String> *r_extensions) const override;
+	virtual Node *import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps = nullptr, Error *r_err = nullptr) override;
+};

editor/import/3d/post_import_plugin_skeleton_renamer.cpp

@@ -0,0 +1,247 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_renamer.cpp                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "post_import_plugin_skeleton_renamer.h"
+
+#include "scene/3d/bone_attachment_3d.h"
+#include "scene/3d/importer_mesh_instance_3d.h"
+#include "scene/3d/skeleton_3d.h"
+#include "scene/animation/animation_player.h"
+#include "scene/resources/bone_map.h"
+
+void PostImportPluginSkeletonRenamer::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/bone_renamer/rename_bones", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/bone_renamer/unique_node/make_unique"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::STRING, "retarget/bone_renamer/unique_node/skeleton_name"), "GeneralSkeleton"));
+	}
+}
+
+void PostImportPluginSkeletonRenamer::_internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, const HashMap<String, String> &p_rename_map) {
+	// Prepare objects.
+	Object *map = p_options["retarget/bone_map"].get_validated_object();
+	if (!map || !bool(p_options["retarget/bone_renamer/rename_bones"])) {
+		return;
+	}
+	Skeleton3D *skeleton = Object::cast_to<Skeleton3D>(p_node);
+	if (skeleton) {
+		// Rename bones in Skeleton3D.
+		int len = skeleton->get_bone_count();
+		for (int i = 0; i < len; i++) {
+			String current_bone_name = skeleton->get_bone_name(i);
+			const HashMap<String, String>::ConstIterator new_bone_name = p_rename_map.find(current_bone_name);
+			if (new_bone_name) {
+				skeleton->set_bone_name(i, new_bone_name->value);
+			}
+		}
+	}
+
+	// Rename bones in Skin.
+	{
+		TypedArray<Node> nodes = p_base_scene->find_children("*", "ImporterMeshInstance3D");
+		while (nodes.size()) {
+			ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(nodes.pop_back());
+			Ref<Skin> skin = mi->get_skin();
+			if (skin.is_valid()) {
+				Node *node = mi->get_node(mi->get_skeleton_path());
+				if (node) {
+					Skeleton3D *mesh_skeleton = Object::cast_to<Skeleton3D>(node);
+					if (mesh_skeleton && node == skeleton) {
+						int len = skin->get_bind_count();
+
+						for (int i = 0; i < len; i++) {
+							String current_bone_name = skin->get_bind_name(i);
+							const HashMap<String, String>::ConstIterator new_bone_name = p_rename_map.find(current_bone_name);
+
+							if (new_bone_name) {
+								skin->set_bind_name(i, new_bone_name->value);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	// Rename bones in AnimationPlayer.
+	{
+		TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+		while (nodes.size()) {
+			AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+			List<StringName> anims;
+			ap->get_animation_list(&anims);
+			for (const StringName &name : anims) {
+				Ref<Animation> anim = ap->get_animation(name);
+				int len = anim->get_track_count();
+				for (int i = 0; i < len; i++) {
+					if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+						continue;
+					}
+					String track_path = String(anim->track_get_path(i).get_concatenated_names());
+					Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+					if (node) {
+						Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+						if (track_skeleton && track_skeleton == skeleton) {
+							String current_bone_name = anim->track_get_path(i).get_subname(0);
+							const HashMap<String, String>::ConstIterator new_bone_name = p_rename_map.find(current_bone_name);
+							if (new_bone_name) {
+								String new_track_path = track_path + ":" + new_bone_name->value;
+								anim->track_set_path(i, new_track_path);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	// Rename bones in all Nodes by calling method.
+	{
+		Dictionary rename_map_dict;
+		for (HashMap<String, String>::ConstIterator E = p_rename_map.begin(); E; ++E) {
+			rename_map_dict[E->key] = E->value;
+		}
+
+		TypedArray<Node> nodes = p_base_scene->find_children("*", "BoneAttachment3D");
+		while (nodes.size()) {
+			BoneAttachment3D *attachment = Object::cast_to<BoneAttachment3D>(nodes.pop_back());
+			if (attachment) {
+				attachment->notify_skeleton_bones_renamed(p_base_scene, skeleton, rename_map_dict);
+			}
+		}
+	}
+}
+
+void PostImportPluginSkeletonRenamer::internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		// Prepare objects.
+		Object *map = p_options["retarget/bone_map"].get_validated_object();
+		if (!map || !bool(p_options["retarget/bone_renamer/rename_bones"])) {
+			return;
+		}
+		Skeleton3D *skeleton = Object::cast_to<Skeleton3D>(p_node);
+		BoneMap *bone_map = Object::cast_to<BoneMap>(map);
+		int len = skeleton->get_bone_count();
+
+		// First, prepare main rename map.
+		HashMap<String, String> main_rename_map;
+		for (int i = 0; i < len; i++) {
+			String bone_name = skeleton->get_bone_name(i);
+			String target_name = bone_map->find_profile_bone_name(bone_name);
+			if (target_name.is_empty()) {
+				continue;
+			}
+			main_rename_map.insert(bone_name, target_name);
+		}
+
+		// Preprocess of renaming bones to avoid to conflict with original bone name.
+		HashMap<String, String> pre_rename_map; // HashMap<skeleton bone name, target(profile) bone name>
+		{
+			Vector<String> solved_name_stack;
+			for (int i = 0; i < len; i++) {
+				String bone_name = skeleton->get_bone_name(i);
+				String target_name = bone_map->find_profile_bone_name(bone_name);
+				if (target_name.is_empty() || bone_name == target_name || skeleton->find_bone(target_name) == -1) {
+					continue; // No conflicting.
+				}
+
+				// Solve conflicting.
+				Ref<SkeletonProfile> profile = bone_map->get_profile();
+				String solved_name = target_name;
+				for (int j = 2; skeleton->find_bone(solved_name) >= 0 || profile->find_bone(solved_name) >= 0 || solved_name_stack.has(solved_name); j++) {
+					solved_name = target_name + itos(j);
+				}
+				solved_name_stack.push_back(solved_name);
+				pre_rename_map.insert(target_name, solved_name);
+			}
+			_internal_process(p_category, p_base_scene, p_node, p_resource, p_options, pre_rename_map);
+		}
+
+		// Main process of renaming bones.
+		{
+			// Apply pre-renaming result to prepared main rename map.
+			Vector<String> remove_queue;
+			for (HashMap<String, String>::Iterator E = main_rename_map.begin(); E; ++E) {
+				if (pre_rename_map.has(E->key)) {
+					remove_queue.push_back(E->key);
+				}
+			}
+			for (int i = 0; i < remove_queue.size(); i++) {
+				main_rename_map.insert(pre_rename_map[remove_queue[i]], main_rename_map[remove_queue[i]]);
+				main_rename_map.erase(remove_queue[i]);
+			}
+			_internal_process(p_category, p_base_scene, p_node, p_resource, p_options, main_rename_map);
+		}
+
+		// Make unique skeleton.
+		if (bool(p_options["retarget/bone_renamer/unique_node/make_unique"])) {
+			String unique_name = String(p_options["retarget/bone_renamer/unique_node/skeleton_name"]);
+			ERR_FAIL_COND_MSG(unique_name.is_empty(), "Skeleton unique name cannot be empty.");
+
+			TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+			while (nodes.size()) {
+				AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+				List<StringName> anims;
+				ap->get_animation_list(&anims);
+				for (const StringName &name : anims) {
+					Ref<Animation> anim = ap->get_animation(name);
+					int track_len = anim->get_track_count();
+					for (int i = 0; i < track_len; i++) {
+						String track_path = String(anim->track_get_path(i).get_concatenated_names());
+						Node *orig_node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+						Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+						while (node) {
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (track_skeleton && track_skeleton == skeleton) {
+								if (node == orig_node) {
+									if (anim->track_get_path(i).get_subname_count() > 0) {
+										anim->track_set_path(i, UNIQUE_NODE_PREFIX + unique_name + String(":") + anim->track_get_path(i).get_concatenated_subnames());
+									} else {
+										anim->track_set_path(i, UNIQUE_NODE_PREFIX + unique_name);
+									}
+								} else {
+									if (anim->track_get_path(i).get_subname_count() > 0) {
+										anim->track_set_path(i, UNIQUE_NODE_PREFIX + unique_name + "/" + String(node->get_path_to(orig_node)) + String(":") + anim->track_get_path(i).get_concatenated_subnames());
+									} else {
+										anim->track_set_path(i, UNIQUE_NODE_PREFIX + unique_name + "/" + String(node->get_path_to(orig_node)));
+									}
+								}
+								break;
+							}
+							node = node->get_parent();
+						}
+					}
+				}
+			}
+			skeleton->set_name(unique_name);
+			skeleton->set_unique_name_in_owner(true);
+		}
+	}
+}

editor/import/3d/post_import_plugin_skeleton_renamer.h

@@ -0,0 +1,43 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_renamer.h                                 */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "resource_importer_scene.h"
+
+class PostImportPluginSkeletonRenamer : public EditorScenePostImportPlugin {
+	GDCLASS(PostImportPluginSkeletonRenamer, EditorScenePostImportPlugin);
+
+public:
+	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) override;
+	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) override;
+
+	void _internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, const HashMap<String, String> &p_rename_map);
+};

editor/import/3d/post_import_plugin_skeleton_rest_fixer.cpp

@@ -0,0 +1,958 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_rest_fixer.cpp                            */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "post_import_plugin_skeleton_rest_fixer.h"
+
+#include "scene/3d/bone_attachment_3d.h"
+#include "scene/3d/importer_mesh_instance_3d.h"
+#include "scene/3d/retarget_modifier_3d.h"
+#include "scene/3d/skeleton_3d.h"
+#include "scene/animation/animation_player.h"
+#include "scene/resources/bone_map.h"
+
+void PostImportPluginSkeletonRestFixer::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/apply_node_transforms"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/normalize_position_tracks"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/reset_all_bone_poses_after_import"), true));
+
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::INT, "retarget/rest_fixer/retarget_method", PROPERTY_HINT_ENUM, "None,Overwrite Axis,Use Retarget Modifier", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), 1));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/keep_global_rest_on_leftovers"), true));
+		String skeleton_bones_must_be_renamed_warning = String(
+				"The skeleton modifier option uses SkeletonProfile as a list of bone names and retargets by name matching. Without renaming, retargeting by modifier will not work and the track path of the animation will be broken and it will be not playbacked correctly."); // TODO: translate.
+		r_options->push_back(ResourceImporter::ImportOption(
+				PropertyInfo(
+						Variant::STRING, U"retarget/rest_fixer/\u26A0_validation_warning/skeleton_bones_must_be_renamed",
+						PROPERTY_HINT_MULTILINE_TEXT, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY),
+				Variant(skeleton_bones_must_be_renamed_warning)));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/use_global_pose"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::STRING, "retarget/rest_fixer/original_skeleton_name"), "OriginalSkeleton"));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/rest_fixer/fix_silhouette/enable", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
+		// TODO: PostImportPlugin need to be implemented such as validate_option(PropertyInfo &property, const Dictionary &p_options).
+		// get_internal_option_visibility() is not sufficient because it can only retrieve options implemented in the core and can only read option values.
+		// r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::ARRAY, "retarget/rest_fixer/filter", PROPERTY_HINT_ARRAY_TYPE, vformat("%s/%s:%s", Variant::STRING_NAME, PROPERTY_HINT_ENUM, "Hips,Spine,Chest")), Array()));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::ARRAY, "retarget/rest_fixer/fix_silhouette/filter", PROPERTY_HINT_ARRAY_TYPE, vformat("%s:", Variant::STRING_NAME)), Array()));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::FLOAT, "retarget/rest_fixer/fix_silhouette/threshold"), 15));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::FLOAT, "retarget/rest_fixer/fix_silhouette/base_height_adjustment", PROPERTY_HINT_RANGE, "-1,1,0.01"), 0.0));
+	}
+}
+
+Variant PostImportPluginSkeletonRestFixer::get_internal_option_visibility(InternalImportCategory p_category, const String &p_scene_import_type, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		if (p_option.begins_with("retarget/rest_fixer/fix_silhouette/")) {
+			if (!bool(p_options["retarget/rest_fixer/fix_silhouette/enable"])) {
+				if (!p_option.ends_with("enable")) {
+					return false;
+				}
+			}
+		} else if (p_option == "retarget/rest_fixer/keep_global_rest_on_leftovers") {
+			return int(p_options["retarget/rest_fixer/retarget_method"]) == 1;
+		} else if (p_option == "retarget/rest_fixer/original_skeleton_name" || p_option == "retarget/rest_fixer/use_global_pose") {
+			return int(p_options["retarget/rest_fixer/retarget_method"]) == 2;
+		} else if (p_option.begins_with("retarget/") && p_option.ends_with("skeleton_bones_must_be_renamed")) {
+			return int(p_options["retarget/rest_fixer/retarget_method"]) == 2 && bool(p_options["retarget/bone_renamer/rename_bones"]) == false;
+		}
+	}
+	return true;
+}
+
+void PostImportPluginSkeletonRestFixer::internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		// Prepare objects.
+		Object *map = p_options["retarget/bone_map"].get_validated_object();
+		if (!map) {
+			return;
+		}
+		BoneMap *bone_map = Object::cast_to<BoneMap>(map);
+		Ref<SkeletonProfile> profile = bone_map->get_profile();
+		if (profile.is_null()) {
+			return;
+		}
+		Skeleton3D *src_skeleton = Object::cast_to<Skeleton3D>(p_node);
+		if (!src_skeleton) {
+			return;
+		}
+
+		bool is_renamed = bool(p_options["retarget/bone_renamer/rename_bones"]);
+		Array filter = p_options["retarget/rest_fixer/fix_silhouette/filter"];
+		bool is_rest_changed = false;
+
+		// Build profile skeleton.
+		Skeleton3D *prof_skeleton = memnew(Skeleton3D);
+		{
+			int prof_bone_len = profile->get_bone_size();
+			// Add single bones.
+			for (int i = 0; i < prof_bone_len; i++) {
+				prof_skeleton->add_bone(profile->get_bone_name(i));
+				prof_skeleton->set_bone_rest(i, profile->get_reference_pose(i));
+			}
+			// Set parents.
+			for (int i = 0; i < prof_bone_len; i++) {
+				int parent = profile->find_bone(profile->get_bone_parent(i));
+				if (parent >= 0) {
+					prof_skeleton->set_bone_parent(i, parent);
+				}
+			}
+		}
+
+		// Get global transform.
+		Transform3D global_transform;
+		if (bool(p_options["retarget/rest_fixer/apply_node_transforms"])) {
+			Node *pr = src_skeleton;
+			while (pr) {
+				Node3D *pr3d = Object::cast_to<Node3D>(pr);
+				if (pr3d) {
+					global_transform = pr3d->get_transform() * global_transform;
+					pr3d->set_transform(Transform3D());
+				}
+				pr = pr->get_parent();
+			}
+			global_transform.origin = Vector3(); // Translation by a Node is not a bone animation, so the retargeted model should be at the origin.
+		}
+
+		// Apply node transforms.
+		if (bool(p_options["retarget/rest_fixer/apply_node_transforms"])) {
+			Vector3 scl = global_transform.basis.get_scale_global();
+
+			Vector<int> bones_to_process = src_skeleton->get_parentless_bones();
+			for (int i = 0; i < bones_to_process.size(); i++) {
+				src_skeleton->set_bone_rest(bones_to_process[i], global_transform.orthonormalized() * src_skeleton->get_bone_rest(bones_to_process[i]));
+
+				src_skeleton->set_bone_pose_position(bones_to_process[i], global_transform.orthonormalized().xform(src_skeleton->get_bone_pose_position(bones_to_process[i])));
+				src_skeleton->set_bone_pose_rotation(bones_to_process[i], global_transform.basis.get_rotation_quaternion() * src_skeleton->get_bone_pose_rotation(bones_to_process[i]));
+				src_skeleton->set_bone_pose_scale(bones_to_process[i], (global_transform.orthonormalized().basis * Basis().scaled(src_skeleton->get_bone_pose_scale((bones_to_process[i])))).get_scale());
+			}
+
+			while (bones_to_process.size() > 0) {
+				int src_idx = bones_to_process[0];
+				bones_to_process.erase(src_idx);
+				Vector<int> src_children = src_skeleton->get_bone_children(src_idx);
+				for (int i = 0; i < src_children.size(); i++) {
+					bones_to_process.push_back(src_children[i]);
+				}
+				src_skeleton->set_bone_rest(src_idx, Transform3D(src_skeleton->get_bone_rest(src_idx).basis, src_skeleton->get_bone_rest(src_idx).origin * scl));
+				src_skeleton->set_bone_pose_position(src_idx, src_skeleton->get_bone_pose_position(src_idx) * scl);
+			}
+
+			// Fix animation by changing node transform.
+			bones_to_process = src_skeleton->get_parentless_bones();
+			{
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+				while (nodes.size()) {
+					AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+					List<StringName> anims;
+					ap->get_animation_list(&anims);
+					for (const StringName &name : anims) {
+						Ref<Animation> anim = ap->get_animation(name);
+						int track_len = anim->get_track_count();
+						for (int i = 0; i < track_len; i++) {
+							if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+								continue;
+							}
+
+							if (anim->track_is_compressed(i)) {
+								continue; // Shouldn't occur in internal_process().
+							}
+
+							String track_path = String(anim->track_get_path(i).get_concatenated_names());
+							Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+							ERR_CONTINUE(!node);
+
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (!track_skeleton || track_skeleton != src_skeleton) {
+								continue;
+							}
+
+							StringName bn = anim->track_get_path(i).get_subname(0);
+							if (!bn) {
+								continue;
+							}
+
+							int bone_idx = src_skeleton->find_bone(bn);
+							int key_len = anim->track_get_key_count(i);
+							if (anim->track_get_type(i) == Animation::TYPE_POSITION_3D) {
+								if (bones_to_process.has(bone_idx)) {
+									for (int j = 0; j < key_len; j++) {
+										Vector3 ps = static_cast<Vector3>(anim->track_get_key_value(i, j));
+										anim->track_set_key_value(i, j, global_transform.basis.xform(ps) + global_transform.origin);
+									}
+								} else {
+									for (int j = 0; j < key_len; j++) {
+										Vector3 ps = static_cast<Vector3>(anim->track_get_key_value(i, j));
+										anim->track_set_key_value(i, j, ps * scl);
+									}
+								}
+							} else if (bones_to_process.has(bone_idx)) {
+								if (anim->track_get_type(i) == Animation::TYPE_ROTATION_3D) {
+									for (int j = 0; j < key_len; j++) {
+										Quaternion qt = static_cast<Quaternion>(anim->track_get_key_value(i, j));
+										anim->track_set_key_value(i, j, global_transform.basis.get_rotation_quaternion() * qt);
+									}
+								} else {
+									for (int j = 0; j < key_len; j++) {
+										Basis sc = Basis().scaled(static_cast<Vector3>(anim->track_get_key_value(i, j)));
+										anim->track_set_key_value(i, j, (global_transform.orthonormalized().basis * sc).get_scale());
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+
+			is_rest_changed = true;
+		}
+
+		// Complement Rotation track for compatibility between different rests.
+		{
+			TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+			while (nodes.size()) {
+				AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+				List<StringName> anims;
+				ap->get_animation_list(&anims);
+				for (const StringName &name : anims) {
+					if (String(name).contains_char('/')) {
+						continue; // Avoid animation library which may be created by importer dynamically.
+					}
+
+					Ref<Animation> anim = ap->get_animation(name);
+					int track_len = anim->get_track_count();
+
+					// Detect does the animation have skeleton's TRS track.
+					String track_path;
+					bool found_skeleton = false;
+					for (int i = 0; i < track_len; i++) {
+						if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+							continue;
+						}
+						track_path = String(anim->track_get_path(i).get_concatenated_names());
+						Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+						if (node) {
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (track_skeleton && track_skeleton == src_skeleton) {
+								found_skeleton = true;
+								break;
+							}
+						}
+					}
+
+					if (!found_skeleton) {
+						continue;
+					}
+
+					// Search and insert rot track if it doesn't exist.
+					for (int prof_idx = 0; prof_idx < prof_skeleton->get_bone_count(); prof_idx++) {
+						String bone_name = is_renamed ? prof_skeleton->get_bone_name(prof_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_idx)));
+						if (bone_name.is_empty()) {
+							continue;
+						}
+						int src_idx = src_skeleton->find_bone(bone_name);
+						if (src_idx == -1) {
+							continue;
+						}
+						String insert_path = track_path + ":" + bone_name;
+						int rot_track = anim->find_track(insert_path, Animation::TYPE_ROTATION_3D);
+						if (rot_track == -1) {
+							int track = anim->add_track(Animation::TYPE_ROTATION_3D);
+							anim->track_set_path(track, insert_path);
+							anim->track_set_imported(track, true);
+							anim->rotation_track_insert_key(track, 0, src_skeleton->get_bone_rest(src_idx).basis.get_rotation_quaternion());
+						}
+					}
+				}
+			}
+		}
+
+		// Fix silhouette.
+		Vector<Transform3D> silhouette_diff; // Transform values to be ignored when overwrite axis.
+		silhouette_diff.resize(src_skeleton->get_bone_count());
+		Transform3D *silhouette_diff_w = silhouette_diff.ptrw();
+		LocalVector<Transform3D> pre_silhouette_skeleton_global_rest;
+		for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+			pre_silhouette_skeleton_global_rest.push_back(src_skeleton->get_bone_global_rest(i));
+		}
+		if (bool(p_options["retarget/rest_fixer/fix_silhouette/enable"])) {
+			Vector<int> bones_to_process = prof_skeleton->get_parentless_bones();
+			while (bones_to_process.size() > 0) {
+				int prof_idx = bones_to_process[0];
+				bones_to_process.erase(prof_idx);
+				Vector<int> prof_children = prof_skeleton->get_bone_children(prof_idx);
+				for (int i = 0; i < prof_children.size(); i++) {
+					bones_to_process.push_back(prof_children[i]);
+				}
+
+				// Calc virtual/looking direction with origins.
+				bool is_filtered = false;
+				for (int i = 0; i < filter.size(); i++) {
+					if (String(filter[i]) == prof_skeleton->get_bone_name(prof_idx)) {
+						is_filtered = true;
+						break;
+					}
+				}
+				if (is_filtered) {
+					continue;
+				}
+
+				int src_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_idx))));
+				if (src_idx < 0 || profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_END) {
+					continue;
+				}
+				Vector3 prof_tail;
+				Vector3 src_tail;
+				if (profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_AVERAGE_CHILDREN) {
+					PackedInt32Array prof_bone_children = prof_skeleton->get_bone_children(prof_idx);
+					int children_size = prof_bone_children.size();
+					if (children_size == 0) {
+						continue;
+					}
+					bool exist_all_children = true;
+					for (int i = 0; i < children_size; i++) {
+						int prof_child_idx = prof_bone_children[i];
+						int src_child_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_child_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_child_idx))));
+						if (src_child_idx < 0) {
+							exist_all_children = false;
+							break;
+						}
+						prof_tail = prof_tail + prof_skeleton->get_bone_global_rest(prof_child_idx).origin;
+						src_tail = src_tail + src_skeleton->get_bone_global_rest(src_child_idx).origin;
+					}
+					if (!exist_all_children) {
+						continue;
+					}
+					prof_tail = prof_tail / children_size;
+					src_tail = src_tail / children_size;
+				}
+				if (profile->get_tail_direction(prof_idx) == SkeletonProfile::TAIL_DIRECTION_SPECIFIC_CHILD) {
+					int prof_tail_idx = prof_skeleton->find_bone(profile->get_bone_tail(prof_idx));
+					if (prof_tail_idx < 0) {
+						continue;
+					}
+					int src_tail_idx = src_skeleton->find_bone(is_renamed ? prof_skeleton->get_bone_name(prof_tail_idx) : String(bone_map->get_skeleton_bone_name(prof_skeleton->get_bone_name(prof_tail_idx))));
+					if (src_tail_idx < 0) {
+						continue;
+					}
+					prof_tail = prof_skeleton->get_bone_global_rest(prof_tail_idx).origin;
+					src_tail = src_skeleton->get_bone_global_rest(src_tail_idx).origin;
+				}
+
+				Vector3 prof_head = prof_skeleton->get_bone_global_rest(prof_idx).origin;
+				Vector3 src_head = src_skeleton->get_bone_global_rest(src_idx).origin;
+
+				Vector3 prof_dir = prof_tail - prof_head;
+				Vector3 src_dir = src_tail - src_head;
+				if (Math::is_zero_approx(prof_dir.length_squared()) || Math::is_zero_approx(src_dir.length_squared())) {
+					continue;
+				}
+				prof_dir.normalize();
+				src_dir.normalize();
+
+				// Rotate rest.
+				if (Math::abs(Math::rad_to_deg(src_dir.angle_to(prof_dir))) > float(p_options["retarget/rest_fixer/fix_silhouette/threshold"])) {
+					Basis diff_b = Basis(Quaternion(src_dir, prof_dir));
+					// Apply rotation difference as global transform to skeleton.
+					Basis src_pg;
+					int src_parent = src_skeleton->get_bone_parent(src_idx);
+					if (src_parent >= 0) {
+						src_pg = src_skeleton->get_bone_global_rest(src_parent).basis;
+					}
+					Transform3D fixed_rest = Transform3D(src_pg.inverse() * diff_b * src_pg * src_skeleton->get_bone_rest(src_idx).basis, src_skeleton->get_bone_rest(src_idx).origin);
+					src_skeleton->set_bone_rest(src_idx, fixed_rest);
+				}
+			}
+
+			// Adjust scale base bone height.
+			float base_adjustment = float(p_options["retarget/rest_fixer/fix_silhouette/base_height_adjustment"]);
+			if (!Math::is_zero_approx(base_adjustment)) {
+				StringName scale_base_bone_name = profile->get_scale_base_bone();
+				int src_bone_idx = src_skeleton->find_bone(scale_base_bone_name);
+				Transform3D src_rest = src_skeleton->get_bone_rest(src_bone_idx);
+				src_skeleton->set_bone_rest(src_bone_idx, Transform3D(src_rest.basis, Vector3(src_rest.origin.x, src_rest.origin.y + base_adjustment, src_rest.origin.z)));
+
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+				while (nodes.size()) {
+					AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+					List<StringName> anims;
+					ap->get_animation_list(&anims);
+					for (const StringName &name : anims) {
+						Ref<Animation> anim = ap->get_animation(name);
+						int track_len = anim->get_track_count();
+						for (int i = 0; i < track_len; i++) {
+							if (anim->track_get_path(i).get_subname_count() != 1 || anim->track_get_type(i) != Animation::TYPE_POSITION_3D) {
+								continue;
+							}
+
+							if (anim->track_is_compressed(i)) {
+								continue; // Shouldn't occur in internal_process().
+							}
+
+							String track_path = String(anim->track_get_path(i).get_concatenated_names());
+							Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+							ERR_CONTINUE(!node);
+
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (!track_skeleton || track_skeleton != src_skeleton) {
+								continue;
+							}
+
+							StringName bn = anim->track_get_path(i).get_concatenated_subnames();
+							if (bn != scale_base_bone_name) {
+								continue;
+							}
+
+							int key_len = anim->track_get_key_count(i);
+							for (int j = 0; j < key_len; j++) {
+								Vector3 pos = static_cast<Vector3>(anim->track_get_key_value(i, j));
+								pos.y += base_adjustment;
+								anim->track_set_key_value(i, j, pos);
+							}
+						}
+					}
+				}
+			}
+
+			// For skin modification in overwrite rest.
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				silhouette_diff_w[i] = pre_silhouette_skeleton_global_rest[i] * src_skeleton->get_bone_global_rest(i).affine_inverse();
+			}
+
+			is_rest_changed = true;
+		}
+
+		// Set motion scale to Skeleton if normalize position tracks.
+		if (bool(p_options["retarget/rest_fixer/normalize_position_tracks"])) {
+			int src_bone_idx = src_skeleton->find_bone(profile->get_scale_base_bone());
+			if (src_bone_idx >= 0) {
+				real_t motion_scale = std::abs(src_skeleton->get_bone_global_rest(src_bone_idx).origin.y);
+				if (motion_scale > 0) {
+					src_skeleton->set_motion_scale(motion_scale);
+				}
+			}
+		}
+
+		bool is_using_modifier = int(p_options["retarget/rest_fixer/retarget_method"]) == 2;
+		bool is_using_global_pose = bool(p_options["retarget/rest_fixer/use_global_pose"]);
+		Skeleton3D *orig_skeleton = nullptr;
+		Skeleton3D *profile_skeleton = nullptr;
+
+		// Retarget in some way.
+		if (int(p_options["retarget/rest_fixer/retarget_method"]) > 0) {
+			LocalVector<Transform3D> old_skeleton_rest;
+			LocalVector<Transform3D> old_skeleton_global_rest;
+			for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+				old_skeleton_rest.push_back(src_skeleton->get_bone_rest(i));
+				old_skeleton_global_rest.push_back(src_skeleton->get_bone_global_rest(i));
+			}
+
+			// Build structure for modifier.
+			if (is_using_modifier) {
+				orig_skeleton = src_skeleton;
+
+				// Duplicate src_skeleton to modify animation tracks, it will memdelele after that animation track modification.
+				src_skeleton = memnew(Skeleton3D);
+				for (int i = 0; i < orig_skeleton->get_bone_count(); i++) {
+					src_skeleton->add_bone(orig_skeleton->get_bone_name(i));
+					src_skeleton->set_bone_rest(i, orig_skeleton->get_bone_rest(i));
+					src_skeleton->set_bone_pose(i, orig_skeleton->get_bone_pose(i));
+				}
+				for (int i = 0; i < orig_skeleton->get_bone_count(); i++) {
+					src_skeleton->set_bone_parent(i, orig_skeleton->get_bone_parent(i));
+				}
+				src_skeleton->set_motion_scale(orig_skeleton->get_motion_scale());
+
+				// Rename orig_skeleton (previous src_skeleton), since it is not animated by animation track with GeneralSkeleton.
+				String original_skeleton_name = String(p_options["retarget/rest_fixer/original_skeleton_name"]);
+				String skel_name = orig_skeleton->get_name();
+				ERR_FAIL_COND_MSG(original_skeleton_name.is_empty(), "Original skeleton name cannot be empty.");
+				ERR_FAIL_COND_MSG(original_skeleton_name == skel_name, "Original skeleton name must be different from unique skeleton name.");
+
+				// Rename profile skeleton to be general skeleton.
+				profile_skeleton = memnew(Skeleton3D);
+				bool is_unique = orig_skeleton->is_unique_name_in_owner();
+				if (is_unique) {
+					orig_skeleton->set_unique_name_in_owner(false);
+				}
+				orig_skeleton->set_name(original_skeleton_name);
+				profile_skeleton->set_name(skel_name);
+				if (is_unique) {
+					profile_skeleton->set_unique_name_in_owner(true);
+				}
+				// Build profile skeleton bones.
+				int len = profile->get_bone_size();
+				for (int i = 0; i < len; i++) {
+					profile_skeleton->add_bone(profile->get_bone_name(i));
+					profile_skeleton->set_bone_rest(i, profile->get_reference_pose(i));
+				}
+				for (int i = 0; i < len; i++) {
+					int target_parent = profile_skeleton->find_bone(profile->get_bone_parent(i));
+					if (target_parent >= 0) {
+						profile_skeleton->set_bone_parent(i, target_parent);
+					}
+				}
+				for (int i = 0; i < len; i++) {
+					Vector3 origin;
+					int found = orig_skeleton->find_bone(profile->get_bone_name(i));
+					String parent_name = profile->get_bone_parent(i);
+					if (found >= 0) {
+						origin = orig_skeleton->get_bone_global_rest(found).origin;
+						if (profile->get_bone_name(i) != profile->get_root_bone()) {
+							int src_parent = -1;
+							while (src_parent < 0 && !parent_name.is_empty()) {
+								src_parent = orig_skeleton->find_bone(parent_name);
+								parent_name = profile->get_bone_parent(profile->find_bone(parent_name));
+							}
+							if (src_parent >= 0) {
+								Transform3D parent_grest = orig_skeleton->get_bone_global_rest(src_parent);
+								origin = origin - parent_grest.origin;
+							}
+						}
+					}
+					int target_parent = profile_skeleton->find_bone(profile->get_bone_parent(i));
+					if (target_parent >= 0) {
+						origin = profile_skeleton->get_bone_global_rest(target_parent).basis.get_rotation_quaternion().xform_inv(origin);
+					}
+					profile_skeleton->set_bone_rest(i, Transform3D(profile_skeleton->get_bone_rest(i).basis, origin));
+				}
+				profile_skeleton->set_motion_scale(orig_skeleton->get_motion_scale());
+				profile_skeleton->reset_bone_poses();
+				// Make structure with modifier.
+				Node *owner = p_node->get_owner();
+
+				Node *pr = orig_skeleton->get_parent();
+				pr->add_child(profile_skeleton);
+				profile_skeleton->set_owner(owner);
+
+				RetargetModifier3D *mod = memnew(RetargetModifier3D);
+				profile_skeleton->add_child(mod);
+				mod->set_owner(owner);
+				mod->set_name("RetargetModifier3D");
+
+				orig_skeleton->set_owner(nullptr);
+				orig_skeleton->reparent(mod, false);
+				orig_skeleton->set_owner(owner);
+				orig_skeleton->set_unique_name_in_owner(true);
+
+				mod->set_use_global_pose(is_using_global_pose);
+				mod->set_profile(profile);
+
+				// Fix skeleton name in animation.
+				// Mapped skeleton is animated by %GenerarSkeleton:RenamedBoneName.
+				// Unmapped skeleton is animated by %OriginalSkeleton:OriginalBoneName.
+				if (is_using_modifier) {
+					TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+					String general_skeleton_pathname = UNIQUE_NODE_PREFIX + profile_skeleton->get_name();
+					while (nodes.size()) {
+						AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+						List<StringName> anims;
+						ap->get_animation_list(&anims);
+						for (const StringName &name : anims) {
+							Ref<Animation> anim = ap->get_animation(name);
+							int track_len = anim->get_track_count();
+							for (int i = 0; i < track_len; i++) {
+								if (anim->track_get_path(i).get_name_count() == 0) {
+									return;
+								}
+								if (anim->track_get_path(i).get_name(0) == general_skeleton_pathname) {
+									bool replace = false;
+									if (anim->track_get_path(i).get_subname_count() > 0) {
+										int found = profile_skeleton->find_bone(anim->track_get_path(i).get_concatenated_subnames());
+										if (found < 0) {
+											replace = true;
+										}
+									} else {
+										replace = true;
+									}
+									if (replace) {
+										String path_string = UNIQUE_NODE_PREFIX + original_skeleton_name;
+										if (anim->track_get_path(i).get_name_count() > 1) {
+											Vector<StringName> names = anim->track_get_path(i).get_names();
+											names.remove_at(0);
+											for (int j = 0; j < names.size(); j++) {
+												path_string += "/" + names[i].operator String();
+											}
+										}
+										if (anim->track_get_path(i).get_subname_count() > 0) {
+											path_string = path_string + String(":") + anim->track_get_path(i).get_concatenated_subnames();
+										}
+										anim->track_set_path(i, path_string);
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+
+			bool keep_global_rest_leftovers = bool(p_options["retarget/rest_fixer/keep_global_rest_on_leftovers"]);
+
+			// Scan hierarchy and populate a whitelist of unmapped bones without mapped descendants.
+			// When both is_using_modifier and is_using_global_pose are enabled, this array is used for detecting warning.
+			Vector<int> keep_bone_rest;
+			if (is_using_modifier || keep_global_rest_leftovers) {
+				Vector<int> bones_to_process = src_skeleton->get_parentless_bones();
+				while (bones_to_process.size() > 0) {
+					int src_idx = bones_to_process[0];
+					bones_to_process.erase(src_idx);
+					Vector<int> src_children = src_skeleton->get_bone_children(src_idx);
+					for (const int &src_child : src_children) {
+						bones_to_process.push_back(src_child);
+					}
+
+					StringName src_bone_name = is_renamed ? StringName(src_skeleton->get_bone_name(src_idx)) : bone_map->find_profile_bone_name(src_skeleton->get_bone_name(src_idx));
+					if (src_bone_name != StringName() && !profile->has_bone(src_bone_name)) {
+						// Scan descendants for mapped bones.
+						bool found_mapped = false;
+
+						Vector<int> descendants_to_process = src_skeleton->get_bone_children(src_idx);
+						while (descendants_to_process.size() > 0) {
+							int desc_idx = descendants_to_process[0];
+							descendants_to_process.erase(desc_idx);
+							Vector<int> desc_children = src_skeleton->get_bone_children(desc_idx);
+							for (const int &desc_child : desc_children) {
+								descendants_to_process.push_back(desc_child);
+							}
+
+							StringName desc_bone_name = is_renamed ? StringName(src_skeleton->get_bone_name(desc_idx)) : bone_map->find_profile_bone_name(src_skeleton->get_bone_name(desc_idx));
+							if (desc_bone_name != StringName() && profile->has_bone(desc_bone_name)) {
+								found_mapped = true;
+								break;
+							}
+						}
+
+						if (!found_mapped) {
+							keep_bone_rest.push_back(src_idx); // No mapped descendants. Add to whitelist.
+						}
+					}
+				}
+			}
+
+			Vector<Basis> diffs;
+			diffs.resize(src_skeleton->get_bone_count());
+			Basis *diffs_w = diffs.ptrw();
+
+			Vector<int> bones_to_process = src_skeleton->get_parentless_bones();
+			while (bones_to_process.size() > 0) {
+				int src_idx = bones_to_process[0];
+				bones_to_process.erase(src_idx);
+				Vector<int> src_children = src_skeleton->get_bone_children(src_idx);
+				for (int i = 0; i < src_children.size(); i++) {
+					bones_to_process.push_back(src_children[i]);
+				}
+
+				Basis tgt_rot;
+				StringName src_bone_name = is_renamed ? StringName(src_skeleton->get_bone_name(src_idx)) : bone_map->find_profile_bone_name(src_skeleton->get_bone_name(src_idx));
+				if (src_bone_name != StringName()) {
+					Basis src_pg;
+					int src_parent_idx = src_skeleton->get_bone_parent(src_idx);
+					if (src_parent_idx >= 0) {
+						src_pg = src_skeleton->get_bone_global_rest(src_parent_idx).basis;
+					}
+					int prof_idx = profile->find_bone(src_bone_name);
+					if (prof_idx >= 0) {
+						// Mapped bone uses reference pose.
+						// It is fine to change rest here even though is_using_modifier is enabled, since next process is aborted with unmapped bones.
+						tgt_rot = src_pg.inverse() * prof_skeleton->get_bone_global_rest(prof_idx).basis;
+					} else if (keep_global_rest_leftovers && keep_bone_rest.has(src_idx)) {
+						// Non-Mapped bones without mapped children keeps global rest.
+						tgt_rot = src_pg.inverse() * old_skeleton_global_rest[src_idx].basis;
+					}
+				}
+
+				if (src_skeleton->get_bone_parent(src_idx) >= 0) {
+					diffs_w[src_idx] = tgt_rot.inverse() * diffs[src_skeleton->get_bone_parent(src_idx)] * src_skeleton->get_bone_rest(src_idx).basis;
+				} else {
+					diffs_w[src_idx] = tgt_rot.inverse() * src_skeleton->get_bone_rest(src_idx).basis;
+				}
+
+				Basis diff;
+				if (src_skeleton->get_bone_parent(src_idx) >= 0) {
+					diff = diffs[src_skeleton->get_bone_parent(src_idx)];
+				}
+				src_skeleton->set_bone_rest(src_idx, Transform3D(tgt_rot, diff.xform(src_skeleton->get_bone_rest(src_idx).origin)));
+			}
+
+			// Fix animation by changing rest.
+			bool warning_detected = false;
+			{
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+				while (nodes.size()) {
+					AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+					ERR_CONTINUE(!ap);
+					List<StringName> anims;
+					ap->get_animation_list(&anims);
+					for (const StringName &name : anims) {
+						Ref<Animation> anim = ap->get_animation(name);
+						int track_len = anim->get_track_count();
+						for (int i = 0; i < track_len; i++) {
+							if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+								continue;
+							}
+
+							if (anim->track_is_compressed(i)) {
+								continue; // Shouldn't occur in internal_process().
+							}
+
+							String track_path = String(anim->track_get_path(i).get_concatenated_names());
+							Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+							ERR_CONTINUE(!node);
+
+							Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+							if (!track_skeleton ||
+									(is_using_modifier && track_skeleton != profile_skeleton && track_skeleton != orig_skeleton) ||
+									(!is_using_modifier && track_skeleton != src_skeleton)) {
+								continue;
+							}
+
+							StringName bn = anim->track_get_path(i).get_subname(0);
+							if (!bn) {
+								continue;
+							}
+
+							int bone_idx = src_skeleton->find_bone(bn);
+
+							if (is_using_modifier) {
+								int prof_idx = profile->find_bone(bn);
+								if (prof_idx < 0) {
+									if (keep_bone_rest.has(bone_idx)) {
+										warning_detected = true;
+									}
+									continue; // If is_using_modifier, the original skeleton rest is not changed.
+								}
+							}
+
+							Transform3D old_rest = old_skeleton_rest[bone_idx];
+							Transform3D new_rest = src_skeleton->get_bone_rest(bone_idx);
+							Transform3D old_pg;
+							Transform3D new_pg;
+							int parent_idx = src_skeleton->get_bone_parent(bone_idx);
+							if (parent_idx >= 0) {
+								old_pg = old_skeleton_global_rest[parent_idx];
+								new_pg = src_skeleton->get_bone_global_rest(parent_idx);
+							}
+
+							int key_len = anim->track_get_key_count(i);
+							if (anim->track_get_type(i) == Animation::TYPE_ROTATION_3D) {
+								Quaternion old_rest_q = old_rest.basis.get_rotation_quaternion();
+								Quaternion new_rest_q = new_rest.basis.get_rotation_quaternion();
+								Quaternion old_pg_q = old_pg.basis.get_rotation_quaternion();
+								Quaternion new_pg_q = new_pg.basis.get_rotation_quaternion();
+								for (int j = 0; j < key_len; j++) {
+									Quaternion qt = static_cast<Quaternion>(anim->track_get_key_value(i, j));
+									anim->track_set_key_value(i, j, new_pg_q.inverse() * old_pg_q * qt * old_rest_q.inverse() * old_pg_q.inverse() * new_pg_q * new_rest_q);
+								}
+							} else if (anim->track_get_type(i) == Animation::TYPE_SCALE_3D) {
+								Basis old_rest_b_inv = old_rest.basis.inverse();
+								Basis new_rest_b = new_rest.basis;
+								Basis old_pg_b = old_pg.basis;
+								Basis new_pg_b = new_pg.basis;
+								Basis old_pg_b_inv = old_pg.basis.inverse();
+								Basis new_pg_b_inv = new_pg.basis.inverse();
+								for (int j = 0; j < key_len; j++) {
+									Basis sc = Basis().scaled(static_cast<Vector3>(anim->track_get_key_value(i, j)));
+									anim->track_set_key_value(i, j, (new_pg_b_inv * old_pg_b * sc * old_rest_b_inv * old_pg_b_inv * new_pg_b * new_rest_b).get_scale());
+								}
+							} else {
+								Vector3 old_rest_o = old_rest.origin;
+								Vector3 new_rest_o = new_rest.origin;
+								Basis old_pg_b = old_pg.basis;
+								Basis new_pg_b = new_pg.basis;
+								for (int j = 0; j < key_len; j++) {
+									Vector3 ps = static_cast<Vector3>(anim->track_get_key_value(i, j));
+									anim->track_set_key_value(i, j, new_pg_b.xform_inv(old_pg_b.xform(ps - old_rest_o)) + new_rest_o);
+								}
+							}
+						}
+					}
+				}
+			}
+			if (is_using_global_pose && warning_detected) {
+				// TODO:
+				// Theoretically, if A and its conversion are calculated correctly taking into account the difference in the number of bones,
+				// there is no need to disable use_global_pose, but this is probably a fairly niche case.
+				WARN_PRINT_ED("Animated extra bone between mapped bones detected, consider disabling Use Global Pose option to prevent that the pose origin be overridden by the RetargetModifier3D.");
+			}
+
+			if (p_options.has("retarget/rest_fixer/reset_all_bone_poses_after_import") && !bool(p_options["retarget/rest_fixer/reset_all_bone_poses_after_import"])) {
+				// If Reset All Bone Poses After Import is disabled, preserve the original bone pose, adjusted for the new bone rolls.
+				for (int bone_idx = 0; bone_idx < src_skeleton->get_bone_count(); bone_idx++) {
+					Transform3D old_rest = old_skeleton_rest[bone_idx];
+					Transform3D new_rest = src_skeleton->get_bone_rest(bone_idx);
+					Transform3D old_pg;
+					Transform3D new_pg;
+					int parent_idx = src_skeleton->get_bone_parent(bone_idx);
+					if (parent_idx >= 0) {
+						old_pg = old_skeleton_global_rest[parent_idx];
+						new_pg = src_skeleton->get_bone_global_rest(parent_idx);
+					}
+
+					Quaternion old_pg_q = old_pg.basis.get_rotation_quaternion();
+					Quaternion new_pg_q = new_pg.basis.get_rotation_quaternion();
+					Quaternion qt = src_skeleton->get_bone_pose_rotation(bone_idx);
+					src_skeleton->set_bone_pose_rotation(bone_idx, new_pg_q.inverse() * old_pg_q * qt * old_rest.basis.get_rotation_quaternion().inverse() * old_pg_q.inverse() * new_pg_q * new_rest.basis.get_rotation_quaternion());
+
+					Basis sc = Basis().scaled(src_skeleton->get_bone_pose_scale(bone_idx));
+					src_skeleton->set_bone_pose_scale(bone_idx, (new_pg.basis.inverse() * old_pg.basis * sc * old_rest.basis.inverse() * old_pg.basis.inverse() * new_pg.basis * new_rest.basis).get_scale());
+					Vector3 ps = src_skeleton->get_bone_pose_position(bone_idx);
+					src_skeleton->set_bone_pose_position(bone_idx, new_pg_q.xform_inv(old_pg_q.xform(ps - old_rest.origin)) + new_rest.origin);
+				}
+			}
+
+			if (is_using_modifier) {
+				memdelete(src_skeleton);
+				src_skeleton = profile_skeleton;
+			}
+
+			is_rest_changed = true;
+		}
+
+		// Scale position tracks by motion scale if normalize position tracks.
+		if (bool(p_options["retarget/rest_fixer/normalize_position_tracks"])) {
+			TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+			while (nodes.size()) {
+				AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+				List<StringName> anims;
+				ap->get_animation_list(&anims);
+				for (const StringName &name : anims) {
+					Ref<Animation> anim = ap->get_animation(name);
+					int track_len = anim->get_track_count();
+					for (int i = 0; i < track_len; i++) {
+						if (anim->track_get_path(i).get_subname_count() != 1 || anim->track_get_type(i) != Animation::TYPE_POSITION_3D) {
+							continue;
+						}
+
+						if (anim->track_is_compressed(i)) {
+							continue; // Shouldn't occur in internal_process().
+						}
+
+						String track_path = String(anim->track_get_path(i).get_concatenated_names());
+						Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+						ERR_CONTINUE(!node);
+
+						Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+						if (!track_skeleton ||
+								(is_using_modifier && track_skeleton != profile_skeleton && track_skeleton != orig_skeleton) ||
+								(!is_using_modifier && track_skeleton != src_skeleton)) {
+							continue;
+						}
+
+						real_t mlt = 1 / src_skeleton->get_motion_scale();
+						int key_len = anim->track_get_key_count(i);
+						for (int j = 0; j < key_len; j++) {
+							Vector3 pos = static_cast<Vector3>(anim->track_get_key_value(i, j));
+							anim->track_set_key_value(i, j, pos * mlt);
+						}
+					}
+				}
+			}
+		}
+
+		if (!is_using_modifier && is_rest_changed) {
+			// Fix skin.
+			{
+				HashSet<Ref<Skin>> mutated_skins;
+				TypedArray<Node> nodes = p_base_scene->find_children("*", "ImporterMeshInstance3D");
+				while (nodes.size()) {
+					ImporterMeshInstance3D *mi = Object::cast_to<ImporterMeshInstance3D>(nodes.pop_back());
+					ERR_CONTINUE(!mi);
+
+					Ref<Skin> skin = mi->get_skin();
+					if (skin.is_null()) {
+						continue;
+					}
+					if (mutated_skins.has(skin)) {
+						continue;
+					}
+					mutated_skins.insert(skin);
+
+					Node *node = mi->get_node(mi->get_skeleton_path());
+					ERR_CONTINUE(!node);
+
+					Skeleton3D *mesh_skeleton = Object::cast_to<Skeleton3D>(node);
+					if (!mesh_skeleton || mesh_skeleton != src_skeleton) {
+						continue;
+					}
+
+					int skin_len = skin->get_bind_count();
+					for (int i = 0; i < skin_len; i++) {
+						StringName bn = skin->get_bind_name(i);
+						int bone_idx = src_skeleton->find_bone(bn);
+						if (bone_idx >= 0) {
+							Transform3D adjust_transform = src_skeleton->get_bone_global_rest(bone_idx).affine_inverse() * silhouette_diff[bone_idx].affine_inverse() * pre_silhouette_skeleton_global_rest[bone_idx];
+							adjust_transform.scale(global_transform.basis.get_scale_global());
+							skin->set_bind_pose(i, adjust_transform * skin->get_bind_pose(i));
+						}
+					}
+				}
+				nodes = src_skeleton->get_children();
+				while (nodes.size()) {
+					BoneAttachment3D *attachment = Object::cast_to<BoneAttachment3D>(nodes.pop_back());
+					if (attachment == nullptr) {
+						continue;
+					}
+					int bone_idx = attachment->get_bone_idx();
+					if (bone_idx == -1) {
+						bone_idx = src_skeleton->find_bone(attachment->get_bone_name());
+					}
+					ERR_CONTINUE(bone_idx < 0 || bone_idx >= src_skeleton->get_bone_count());
+					Transform3D adjust_transform = src_skeleton->get_bone_global_rest(bone_idx).affine_inverse() * silhouette_diff[bone_idx].affine_inverse() * pre_silhouette_skeleton_global_rest[bone_idx];
+					adjust_transform.scale(global_transform.basis.get_scale_global());
+
+					TypedArray<Node> child_nodes = attachment->get_children();
+					while (child_nodes.size()) {
+						Node3D *child = Object::cast_to<Node3D>(child_nodes.pop_back());
+						if (child == nullptr) {
+							continue;
+						}
+						child->set_transform(adjust_transform * child->get_transform());
+					}
+				}
+			}
+
+			if (!p_options.has("retarget/rest_fixer/reset_all_bone_poses_after_import") || bool(p_options["retarget/rest_fixer/reset_all_bone_poses_after_import"])) {
+				// Init skeleton pose to new rest.
+				for (int i = 0; i < src_skeleton->get_bone_count(); i++) {
+					Transform3D fixed_rest = src_skeleton->get_bone_rest(i);
+					src_skeleton->set_bone_pose_position(i, fixed_rest.origin);
+					src_skeleton->set_bone_pose_rotation(i, fixed_rest.basis.get_rotation_quaternion());
+					src_skeleton->set_bone_pose_scale(i, fixed_rest.basis.get_scale());
+				}
+				if (orig_skeleton) {
+					for (int i = 0; i < orig_skeleton->get_bone_count(); i++) {
+						Transform3D fixed_rest = orig_skeleton->get_bone_rest(i);
+						orig_skeleton->set_bone_pose_position(i, fixed_rest.origin);
+						orig_skeleton->set_bone_pose_rotation(i, fixed_rest.basis.get_rotation_quaternion());
+						orig_skeleton->set_bone_pose_scale(i, fixed_rest.basis.get_scale());
+					}
+				}
+			}
+		}
+
+		memdelete(prof_skeleton);
+	}
+}

editor/import/3d/post_import_plugin_skeleton_rest_fixer.h

@@ -0,0 +1,42 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_rest_fixer.h                              */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "resource_importer_scene.h"
+
+class PostImportPluginSkeletonRestFixer : public EditorScenePostImportPlugin {
+	GDCLASS(PostImportPluginSkeletonRestFixer, EditorScenePostImportPlugin);
+
+public:
+	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) override;
+	virtual Variant get_internal_option_visibility(InternalImportCategory p_category, const String &p_scene_import_type, const String &p_option, const HashMap<StringName, Variant> &p_options) const override;
+	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) override;
+};

editor/import/3d/post_import_plugin_skeleton_track_organizer.cpp

@@ -0,0 +1,155 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_track_organizer.cpp                       */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "post_import_plugin_skeleton_track_organizer.h"
+
+#include "scene/3d/skeleton_3d.h"
+#include "scene/animation/animation_player.h"
+#include "scene/resources/bone_map.h"
+
+void PostImportPluginSkeletonTrackOrganizer::get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/remove_tracks/except_bone_transform"), false));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::BOOL, "retarget/remove_tracks/unimportant_positions"), true));
+		r_options->push_back(ResourceImporter::ImportOption(PropertyInfo(Variant::INT, "retarget/remove_tracks/unmapped_bones", PROPERTY_HINT_ENUM, "None,Remove,Separate Library"), 0));
+	}
+}
+
+void PostImportPluginSkeletonTrackOrganizer::internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) {
+	if (p_category == INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE) {
+		// Prepare objects.
+		Object *map = p_options["retarget/bone_map"].get_validated_object();
+		if (!map) {
+			return;
+		}
+		BoneMap *bone_map = Object::cast_to<BoneMap>(map);
+		Ref<SkeletonProfile> profile = bone_map->get_profile();
+		if (profile.is_null()) {
+			return;
+		}
+		Skeleton3D *src_skeleton = Object::cast_to<Skeleton3D>(p_node);
+		if (!src_skeleton) {
+			return;
+		}
+		bool remove_except_bone = bool(p_options["retarget/remove_tracks/except_bone_transform"]);
+		bool remove_positions = bool(p_options["retarget/remove_tracks/unimportant_positions"]);
+		int separate_unmapped_bones = int(p_options["retarget/remove_tracks/unmapped_bones"]);
+
+		if (!remove_positions && separate_unmapped_bones == 0) {
+			return;
+		}
+
+		TypedArray<Node> nodes = p_base_scene->find_children("*", "AnimationPlayer");
+		while (nodes.size()) {
+			AnimationPlayer *ap = Object::cast_to<AnimationPlayer>(nodes.pop_back());
+			List<StringName> anims;
+			ap->get_animation_list(&anims);
+
+			Ref<AnimationLibrary> unmapped_al;
+			unmapped_al.instantiate();
+
+			for (const StringName &name : anims) {
+				Ref<Animation> anim = ap->get_animation(name);
+				int track_len = anim->get_track_count();
+				Vector<int> remove_indices;
+				Vector<int> mapped_bone_indices;
+				Vector<int> unmapped_bone_indices;
+				for (int i = 0; i < track_len; i++) {
+					String track_path = String(anim->track_get_path(i).get_concatenated_names());
+					Node *node = (ap->get_node(ap->get_root_node()))->get_node(NodePath(track_path));
+					if (!node) {
+						if (remove_except_bone) {
+							remove_indices.push_back(i);
+						}
+						continue;
+					}
+					Skeleton3D *track_skeleton = Object::cast_to<Skeleton3D>(node);
+					if (track_skeleton && track_skeleton == src_skeleton) {
+						if (anim->track_get_path(i).get_subname_count() != 1 || !(anim->track_get_type(i) == Animation::TYPE_POSITION_3D || anim->track_get_type(i) == Animation::TYPE_ROTATION_3D || anim->track_get_type(i) == Animation::TYPE_SCALE_3D)) {
+							if (remove_except_bone) {
+								remove_indices.push_back(i);
+							}
+							continue;
+						}
+						StringName bn = anim->track_get_path(i).get_subname(0);
+						if (bn) {
+							int prof_idx = profile->find_bone(bone_map->find_profile_bone_name(bn));
+							if (prof_idx < 0) {
+								unmapped_bone_indices.push_back(i);
+								continue;
+							}
+							if (remove_positions && anim->track_get_type(i) == Animation::TYPE_POSITION_3D && prof_idx >= 0) {
+								StringName prof_bn = profile->get_bone_name(prof_idx);
+								if (prof_bn == profile->get_root_bone() || prof_bn == profile->get_scale_base_bone()) {
+									mapped_bone_indices.push_back(i);
+									continue;
+								}
+								remove_indices.push_back(i);
+							} else {
+								mapped_bone_indices.push_back(i);
+							}
+						}
+					}
+					if (remove_except_bone) {
+						remove_indices.push_back(i);
+					}
+				}
+
+				if (separate_unmapped_bones == 2 && !unmapped_bone_indices.is_empty()) {
+					Ref<Animation> unmapped_anim = anim->duplicate();
+					Vector<int> to_delete;
+					to_delete.append_array(mapped_bone_indices);
+					to_delete.append_array(remove_indices);
+					to_delete.sort();
+					to_delete.reverse();
+					for (int E : to_delete) {
+						unmapped_anim->remove_track(E);
+					}
+					unmapped_al->add_animation(name, unmapped_anim);
+				}
+
+				if (separate_unmapped_bones >= 1) {
+					remove_indices.append_array(unmapped_bone_indices);
+					remove_indices.sort();
+				}
+				remove_indices.reverse();
+				for (int i = 0; i < remove_indices.size(); i++) {
+					anim->remove_track(remove_indices[i]);
+				}
+			}
+
+			if (unmapped_al->get_animation_list_size() == 0) {
+				unmapped_al.unref();
+			} else if (separate_unmapped_bones == 2) {
+				ap->add_animation_library("unmapped_bones", unmapped_al);
+			}
+		}
+	}
+}

editor/import/3d/post_import_plugin_skeleton_track_organizer.h

@@ -0,0 +1,41 @@
+/**************************************************************************/
+/*  post_import_plugin_skeleton_track_organizer.h                         */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "resource_importer_scene.h"
+
+class PostImportPluginSkeletonTrackOrganizer : public EditorScenePostImportPlugin {
+	GDCLASS(PostImportPluginSkeletonTrackOrganizer, EditorScenePostImportPlugin);
+
+public:
+	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) override;
+	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) override;
+};

editor/import/3d/resource_importer_obj.cpp

@@ -0,0 +1,681 @@
+/**************************************************************************/
+/*  resource_importer_obj.cpp                                             */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "resource_importer_obj.h"
+
+#include "core/io/file_access.h"
+#include "core/io/resource_saver.h"
+#include "scene/3d/importer_mesh_instance_3d.h"
+#include "scene/3d/node_3d.h"
+#include "scene/resources/3d/importer_mesh.h"
+#include "scene/resources/mesh.h"
+#include "scene/resources/surface_tool.h"
+
+static Error _parse_material_library(const String &p_path, HashMap<String, Ref<StandardMaterial3D>> &material_map, List<String> *r_missing_deps) {
+	Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
+	ERR_FAIL_COND_V_MSG(f.is_null(), ERR_CANT_OPEN, vformat("Couldn't open MTL file '%s', it may not exist or not be readable.", p_path));
+
+	Ref<StandardMaterial3D> current;
+	String current_name;
+	String base_path = p_path.get_base_dir();
+	while (true) {
+		String l = f->get_line().strip_edges();
+
+		if (l.begins_with("newmtl ")) {
+			//vertex
+
+			current_name = l.replace("newmtl", "").strip_edges();
+			current.instantiate();
+			current->set_name(current_name);
+			material_map[current_name] = current;
+		} else if (l.begins_with("Ka ")) {
+			//uv
+			WARN_PRINT("OBJ: Ambient light for material '" + current_name + "' is ignored in PBR");
+
+		} else if (l.begins_with("Kd ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 4, ERR_INVALID_DATA);
+			Color c = current->get_albedo();
+			c.r = v[1].to_float();
+			c.g = v[2].to_float();
+			c.b = v[3].to_float();
+			current->set_albedo(c);
+		} else if (l.begins_with("Ks ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 4, ERR_INVALID_DATA);
+			float r = v[1].to_float();
+			float g = v[2].to_float();
+			float b = v[3].to_float();
+			float metalness = MAX(r, MAX(g, b));
+			current->set_metallic(metalness);
+		} else if (l.begins_with("Ns ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
+			float s = v[1].to_float();
+			current->set_metallic((1000.0 - s) / 1000.0);
+		} else if (l.begins_with("d ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
+			float d = v[1].to_float();
+			Color c = current->get_albedo();
+			c.a = d;
+			current->set_albedo(c);
+			if (c.a < 0.99) {
+				current->set_transparency(StandardMaterial3D::TRANSPARENCY_ALPHA);
+			}
+		} else if (l.begins_with("Tr ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() != 2, ERR_INVALID_DATA);
+			float d = v[1].to_float();
+			Color c = current->get_albedo();
+			c.a = 1.0 - d;
+			current->set_albedo(c);
+			if (c.a < 0.99) {
+				current->set_transparency(StandardMaterial3D::TRANSPARENCY_ALPHA);
+			}
+
+		} else if (l.begins_with("map_Ka ")) {
+			//uv
+			WARN_PRINT("OBJ: Ambient light texture for material '" + current_name + "' is ignored in PBR");
+
+		} else if (l.begins_with("map_Kd ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+
+			String p = l.replace("map_Kd", "").replace_char('\\', '/').strip_edges();
+			String path;
+			if (p.is_absolute_path()) {
+				path = p;
+			} else {
+				path = base_path.path_join(p);
+			}
+
+			Ref<Texture2D> texture = ResourceLoader::load(path);
+
+			if (texture.is_valid()) {
+				current->set_texture(StandardMaterial3D::TEXTURE_ALBEDO, texture);
+			} else if (r_missing_deps) {
+				r_missing_deps->push_back(path);
+			}
+
+		} else if (l.begins_with("map_Ks ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+
+			String p = l.replace("map_Ks", "").replace_char('\\', '/').strip_edges();
+			String path;
+			if (p.is_absolute_path()) {
+				path = p;
+			} else {
+				path = base_path.path_join(p);
+			}
+
+			Ref<Texture2D> texture = ResourceLoader::load(path);
+
+			if (texture.is_valid()) {
+				current->set_texture(StandardMaterial3D::TEXTURE_METALLIC, texture);
+			} else if (r_missing_deps) {
+				r_missing_deps->push_back(path);
+			}
+
+		} else if (l.begins_with("map_Ns ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+
+			String p = l.replace("map_Ns", "").replace_char('\\', '/').strip_edges();
+			String path;
+			if (p.is_absolute_path()) {
+				path = p;
+			} else {
+				path = base_path.path_join(p);
+			}
+
+			Ref<Texture2D> texture = ResourceLoader::load(path);
+
+			if (texture.is_valid()) {
+				current->set_texture(StandardMaterial3D::TEXTURE_ROUGHNESS, texture);
+			} else if (r_missing_deps) {
+				r_missing_deps->push_back(path);
+			}
+		} else if (l.begins_with("map_bump ")) {
+			//normal
+			ERR_FAIL_COND_V(current.is_null(), ERR_FILE_CORRUPT);
+
+			String p = l.replace("map_bump", "").replace_char('\\', '/').strip_edges();
+			String path = base_path.path_join(p);
+
+			Ref<Texture2D> texture = ResourceLoader::load(path);
+
+			if (texture.is_valid()) {
+				current->set_feature(StandardMaterial3D::FEATURE_NORMAL_MAPPING, true);
+				current->set_texture(StandardMaterial3D::TEXTURE_NORMAL, texture);
+			} else if (r_missing_deps) {
+				r_missing_deps->push_back(path);
+			}
+		} else if (f->eof_reached()) {
+			break;
+		}
+	}
+
+	return OK;
+}
+
+static Error _parse_obj(const String &p_path, List<Ref<ImporterMesh>> &r_meshes, bool p_single_mesh, bool p_generate_tangents, bool p_generate_lods, bool p_generate_shadow_mesh, bool p_generate_lightmap_uv2, float p_generate_lightmap_uv2_texel_size, const PackedByteArray &p_src_lightmap_cache, Vector3 p_scale_mesh, Vector3 p_offset_mesh, bool p_disable_compression, Vector<Vector<uint8_t>> &r_lightmap_caches, List<String> *r_missing_deps) {
+	Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
+	ERR_FAIL_COND_V_MSG(f.is_null(), ERR_CANT_OPEN, vformat("Couldn't open OBJ file '%s', it may not exist or not be readable.", p_path));
+
+	// Avoid trying to load/interpret potential build artifacts from Visual Studio (e.g. when compiling native plugins inside the project tree).
+	// This should only match if it's indeed a COFF file header.
+	// https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#machine-types
+	const int first_bytes = f->get_16();
+	static const Vector<int> coff_header_machines{
+		0x0, // IMAGE_FILE_MACHINE_UNKNOWN
+		0x8664, // IMAGE_FILE_MACHINE_AMD64
+		0x1c0, // IMAGE_FILE_MACHINE_ARM
+		0x14c, // IMAGE_FILE_MACHINE_I386
+		0x200, // IMAGE_FILE_MACHINE_IA64
+	};
+	ERR_FAIL_COND_V_MSG(coff_header_machines.has(first_bytes), ERR_FILE_CORRUPT, vformat("Couldn't read OBJ file '%s', it seems to be binary, corrupted, or empty.", p_path));
+	f->seek(0);
+
+	Ref<ImporterMesh> mesh;
+	mesh.instantiate();
+
+	bool generate_tangents = p_generate_tangents;
+	Vector3 scale_mesh = p_scale_mesh;
+	Vector3 offset_mesh = p_offset_mesh;
+
+	Vector<Vector3> vertices;
+	Vector<Vector3> normals;
+	Vector<Vector2> uvs;
+	Vector<Color> colors;
+	const String default_name = "Mesh";
+	String name = default_name;
+
+	HashMap<String, HashMap<String, Ref<StandardMaterial3D>>> material_map;
+
+	Ref<SurfaceTool> surf_tool = memnew(SurfaceTool);
+	surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
+
+	String current_material_library;
+	String current_material;
+	String current_group;
+	uint32_t smooth_group = 0;
+	bool smoothing = true;
+	const uint32_t no_smoothing_smooth_group = (uint32_t)-1;
+
+	bool uses_uvs = false;
+
+	while (true) {
+		String l = f->get_line().strip_edges();
+		while (l.length() && l[l.length() - 1] == '\\') {
+			String add = f->get_line().strip_edges();
+			l += add;
+			if (add.is_empty()) {
+				break;
+			}
+		}
+
+		if (l.begins_with("v ")) {
+			//vertex
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
+			Vector3 vtx;
+			vtx.x = v[1].to_float() * scale_mesh.x + offset_mesh.x;
+			vtx.y = v[2].to_float() * scale_mesh.y + offset_mesh.y;
+			vtx.z = v[3].to_float() * scale_mesh.z + offset_mesh.z;
+			vertices.push_back(vtx);
+			//vertex color
+			if (v.size() >= 7) {
+				while (colors.size() < vertices.size() - 1) {
+					colors.push_back(Color(1.0, 1.0, 1.0));
+				}
+				Color c;
+				c.r = v[4].to_float();
+				c.g = v[5].to_float();
+				c.b = v[6].to_float();
+				colors.push_back(c);
+			} else if (!colors.is_empty()) {
+				colors.push_back(Color(1.0, 1.0, 1.0));
+			}
+		} else if (l.begins_with("vt ")) {
+			//uv
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 3, ERR_FILE_CORRUPT);
+			Vector2 uv;
+			uv.x = v[1].to_float();
+			uv.y = 1.0 - v[2].to_float();
+			uvs.push_back(uv);
+		} else if (l.begins_with("vn ")) {
+			//normal
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
+			Vector3 nrm;
+			nrm.x = v[1].to_float();
+			nrm.y = v[2].to_float();
+			nrm.z = v[3].to_float();
+			normals.push_back(nrm);
+		} else if (l.begins_with("f ")) {
+			//vertex
+
+			Vector<String> v = l.split(" ", false);
+			ERR_FAIL_COND_V(v.size() < 4, ERR_FILE_CORRUPT);
+
+			//not very fast, could be sped up
+
+			Vector<String> face[3];
+			face[0] = v[1].split("/");
+			face[1] = v[2].split("/");
+			ERR_FAIL_COND_V(face[0].is_empty(), ERR_FILE_CORRUPT);
+
+			ERR_FAIL_COND_V(face[0].size() != face[1].size(), ERR_FILE_CORRUPT);
+			for (int i = 2; i < v.size() - 1; i++) {
+				face[2] = v[i + 1].split("/");
+
+				ERR_FAIL_COND_V(face[0].size() != face[2].size(), ERR_FILE_CORRUPT);
+				for (int j = 0; j < 3; j++) {
+					int idx = j;
+
+					if (idx < 2) {
+						idx = 1 ^ idx;
+					}
+
+					// Check UVs before faces as we may need to generate dummy tangents if there are no UVs.
+					if (face[idx].size() >= 2 && !face[idx][1].is_empty()) {
+						int uv = face[idx][1].to_int() - 1;
+						if (uv < 0) {
+							uv += uvs.size() + 1;
+						}
+						ERR_FAIL_INDEX_V(uv, uvs.size(), ERR_FILE_CORRUPT);
+						surf_tool->set_uv(uvs[uv]);
+						uses_uvs = true;
+					}
+
+					if (face[idx].size() == 3) {
+						int norm = face[idx][2].to_int() - 1;
+						if (norm < 0) {
+							norm += normals.size() + 1;
+						}
+						ERR_FAIL_INDEX_V(norm, normals.size(), ERR_FILE_CORRUPT);
+						surf_tool->set_normal(normals[norm]);
+						if (generate_tangents && !uses_uvs) {
+							// We can't generate tangents without UVs, so create dummy tangents.
+							Vector3 tan = Vector3(normals[norm].z, -normals[norm].x, normals[norm].y).cross(normals[norm].normalized()).normalized();
+							surf_tool->set_tangent(Plane(tan.x, tan.y, tan.z, 1.0));
+						}
+					} else {
+						// No normals, use a dummy tangent since normals and tangents will be generated.
+						if (generate_tangents && !uses_uvs) {
+							// We can't generate tangents without UVs, so create dummy tangents.
+							surf_tool->set_tangent(Plane(1.0, 0.0, 0.0, 1.0));
+						}
+					}
+
+					int vtx = face[idx][0].to_int() - 1;
+					if (vtx < 0) {
+						vtx += vertices.size() + 1;
+					}
+					ERR_FAIL_INDEX_V(vtx, vertices.size(), ERR_FILE_CORRUPT);
+
+					Vector3 vertex = vertices[vtx];
+					if (!colors.is_empty()) {
+						surf_tool->set_color(colors[vtx]);
+					}
+					surf_tool->set_smooth_group(smoothing ? smooth_group : no_smoothing_smooth_group);
+					surf_tool->add_vertex(vertex);
+				}
+
+				face[1] = face[2];
+			}
+		} else if (l.begins_with("s ")) { //smoothing
+			String what = l.substr(2).strip_edges();
+			bool do_smooth;
+			if (what == "off") {
+				do_smooth = false;
+			} else {
+				do_smooth = true;
+			}
+			if (do_smooth != smoothing) {
+				smoothing = do_smooth;
+				if (smoothing) {
+					smooth_group++;
+				}
+			}
+		} else if (/*l.begins_with("g ") ||*/ l.begins_with("usemtl ") || (l.begins_with("o ") || f->eof_reached())) { //commit group to mesh
+			uint64_t mesh_flags = RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES;
+
+			if (p_disable_compression) {
+				mesh_flags = 0;
+			} else {
+				bool is_mesh_2d = true;
+
+				// Disable compression if all z equals 0 (the mesh is 2D).
+				for (int i = 0; i < vertices.size(); i++) {
+					if (!Math::is_zero_approx(vertices[i].z)) {
+						is_mesh_2d = false;
+						break;
+					}
+				}
+
+				if (is_mesh_2d) {
+					mesh_flags = 0;
+				}
+			}
+
+			//groups are too annoying
+			if (surf_tool->get_vertex_array().size()) {
+				//another group going on, commit it
+				if (normals.is_empty()) {
+					surf_tool->generate_normals();
+				}
+
+				if (generate_tangents && uses_uvs) {
+					surf_tool->generate_tangents();
+				}
+
+				surf_tool->index();
+
+				print_verbose("OBJ: Current material library " + current_material_library + " has " + itos(material_map.has(current_material_library)));
+				print_verbose("OBJ: Current material " + current_material + " has " + itos(material_map.has(current_material_library) && material_map[current_material_library].has(current_material)));
+				Ref<StandardMaterial3D> material;
+				if (material_map.has(current_material_library) && material_map[current_material_library].has(current_material)) {
+					material = material_map[current_material_library][current_material];
+					if (!colors.is_empty()) {
+						material->set_flag(StandardMaterial3D::FLAG_SRGB_VERTEX_COLOR, true);
+					}
+					surf_tool->set_material(material);
+				}
+
+				Array array = surf_tool->commit_to_arrays();
+
+				if (mesh_flags & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES && generate_tangents && uses_uvs) {
+					// Compression is enabled, so let's validate that the normals and generated tangents are correct.
+					Vector<Vector3> norms = array[Mesh::ARRAY_NORMAL];
+					Vector<float> tangents = array[Mesh::ARRAY_TANGENT];
+					ERR_FAIL_COND_V(tangents.is_empty(), ERR_FILE_CORRUPT);
+					for (int vert = 0; vert < norms.size(); vert++) {
+						Vector3 tan = Vector3(tangents[vert * 4 + 0], tangents[vert * 4 + 1], tangents[vert * 4 + 2]);
+						if (std::abs(tan.dot(norms[vert])) > 0.0001) {
+							// Tangent is not perpendicular to the normal, so we can't use compression.
+							mesh_flags &= ~RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES;
+						}
+					}
+				}
+
+				mesh->add_surface(Mesh::PRIMITIVE_TRIANGLES, array, TypedArray<Array>(), Dictionary(), material, name, mesh_flags);
+
+				print_verbose("OBJ: Added surface :" + mesh->get_surface_name(mesh->get_surface_count() - 1));
+
+				if (!current_material.is_empty()) {
+					if (mesh->get_surface_count() >= 1) {
+						mesh->set_surface_name(mesh->get_surface_count() - 1, current_material.get_basename());
+					}
+				} else if (!current_group.is_empty()) {
+					if (mesh->get_surface_count() >= 1) {
+						mesh->set_surface_name(mesh->get_surface_count() - 1, current_group);
+					}
+				}
+
+				surf_tool->clear();
+				surf_tool->begin(Mesh::PRIMITIVE_TRIANGLES);
+				uses_uvs = false;
+			}
+
+			if (l.begins_with("o ") || f->eof_reached()) {
+				if (!p_single_mesh) {
+					if (mesh->get_surface_count() > 0) {
+						mesh->set_name(name);
+						r_meshes.push_back(mesh);
+						mesh.instantiate();
+					}
+					name = default_name;
+					current_group = "";
+					current_material = "";
+				}
+			}
+
+			if (f->eof_reached()) {
+				break;
+			}
+
+			if (l.begins_with("o ")) {
+				name = l.substr(2).strip_edges();
+			}
+
+			if (l.begins_with("usemtl ")) {
+				current_material = l.replace("usemtl", "").strip_edges();
+			}
+
+			if (l.begins_with("g ")) {
+				current_group = l.substr(2).strip_edges();
+			}
+
+		} else if (l.begins_with("mtllib ")) { //parse material
+
+			current_material_library = l.replace("mtllib", "").strip_edges();
+			if (!material_map.has(current_material_library)) {
+				HashMap<String, Ref<StandardMaterial3D>> lib;
+				String lib_path = current_material_library;
+				if (lib_path.is_relative_path()) {
+					lib_path = p_path.get_base_dir().path_join(current_material_library);
+				}
+				Error err = _parse_material_library(lib_path, lib, r_missing_deps);
+				if (err == OK) {
+					material_map[current_material_library] = lib;
+				}
+			}
+		}
+	}
+
+	if (p_generate_lightmap_uv2) {
+		Vector<uint8_t> lightmap_cache;
+		mesh->lightmap_unwrap_cached(Transform3D(), p_generate_lightmap_uv2_texel_size, p_src_lightmap_cache, lightmap_cache);
+
+		if (!lightmap_cache.is_empty()) {
+			if (r_lightmap_caches.is_empty()) {
+				r_lightmap_caches.push_back(lightmap_cache);
+			} else {
+				// MD5 is stored at the beginning of the cache data.
+				const String new_md5 = String::md5(lightmap_cache.ptr());
+
+				for (int i = 0; i < r_lightmap_caches.size(); i++) {
+					const String md5 = String::md5(r_lightmap_caches[i].ptr());
+					if (new_md5 < md5) {
+						r_lightmap_caches.insert(i, lightmap_cache);
+						break;
+					}
+
+					if (new_md5 == md5) {
+						break;
+					}
+				}
+			}
+		}
+	}
+
+	if (p_generate_lods) {
+		// Use normal merge/split angles that match the defaults used for 3D scene importing.
+		mesh->generate_lods(60.0f, {});
+	}
+
+	if (p_generate_shadow_mesh) {
+		mesh->create_shadow_mesh();
+	}
+
+	mesh->optimize_indices();
+
+	if (p_single_mesh && mesh->get_surface_count() > 0) {
+		r_meshes.push_back(mesh);
+	}
+
+	return OK;
+}
+
+Node *EditorOBJImporter::import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err) {
+	List<Ref<ImporterMesh>> meshes;
+
+	// LOD, shadow mesh and lightmap UV2 generation are handled by ResourceImporterScene in this case,
+	// so disable it within the OBJ mesh import.
+	Vector<Vector<uint8_t>> mesh_lightmap_caches;
+	Error err = _parse_obj(p_path, meshes, false, p_flags & IMPORT_GENERATE_TANGENT_ARRAYS, false, false, false, 0.2, PackedByteArray(), Vector3(1, 1, 1), Vector3(0, 0, 0), p_flags & IMPORT_FORCE_DISABLE_MESH_COMPRESSION, mesh_lightmap_caches, r_missing_deps);
+
+	if (err != OK) {
+		if (r_err) {
+			*r_err = err;
+		}
+		return nullptr;
+	}
+
+	Node3D *scene = memnew(Node3D);
+
+	for (Ref<ImporterMesh> m : meshes) {
+		ImporterMeshInstance3D *mi = memnew(ImporterMeshInstance3D);
+		mi->set_mesh(m);
+		mi->set_name(m->get_name());
+		scene->add_child(mi, true);
+		mi->set_owner(scene);
+	}
+
+	if (r_err) {
+		*r_err = OK;
+	}
+
+	return scene;
+}
+
+void EditorOBJImporter::get_extensions(List<String> *r_extensions) const {
+	r_extensions->push_back("obj");
+}
+
+////////////////////////////////////////////////////
+
+String ResourceImporterOBJ::get_importer_name() const {
+	return "wavefront_obj";
+}
+
+String ResourceImporterOBJ::get_visible_name() const {
+	return "OBJ as Mesh";
+}
+
+void ResourceImporterOBJ::get_recognized_extensions(List<String> *p_extensions) const {
+	p_extensions->push_back("obj");
+}
+
+String ResourceImporterOBJ::get_save_extension() const {
+	return "mesh";
+}
+
+String ResourceImporterOBJ::get_resource_type() const {
+	return "Mesh";
+}
+
+int ResourceImporterOBJ::get_format_version() const {
+	return 1;
+}
+
+int ResourceImporterOBJ::get_preset_count() const {
+	return 0;
+}
+
+String ResourceImporterOBJ::get_preset_name(int p_idx) const {
+	return "";
+}
+
+void ResourceImporterOBJ::get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset) const {
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_tangents"), true));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_lods"), true));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_shadow_mesh"), true));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "generate_lightmap_uv2", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_UPDATE_ALL_IF_MODIFIED), false));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::FLOAT, "generate_lightmap_uv2_texel_size", PROPERTY_HINT_RANGE, "0.001,100,0.001"), 0.2));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "scale_mesh"), Vector3(1, 1, 1)));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::VECTOR3, "offset_mesh"), Vector3(0, 0, 0)));
+	r_options->push_back(ImportOption(PropertyInfo(Variant::BOOL, "force_disable_mesh_compression"), false));
+}
+
+bool ResourceImporterOBJ::get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const {
+	if (p_option == "generate_lightmap_uv2_texel_size" && !p_options["generate_lightmap_uv2"]) {
+		// Only display the lightmap texel size import option when lightmap UV2 generation is enabled.
+		return false;
+	}
+
+	return true;
+}
+
+Error ResourceImporterOBJ::import(ResourceUID::ID p_source_id, const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
+	List<Ref<ImporterMesh>> meshes;
+
+	Vector<uint8_t> src_lightmap_cache;
+	Vector<Vector<uint8_t>> mesh_lightmap_caches;
+
+	Error err;
+	{
+		src_lightmap_cache = FileAccess::get_file_as_bytes(p_source_file + ".unwrap_cache", &err);
+		if (err != OK) {
+			src_lightmap_cache.clear();
+		}
+	}
+
+	err = _parse_obj(p_source_file, meshes, true, p_options["generate_tangents"], p_options["generate_lods"], p_options["generate_shadow_mesh"], p_options["generate_lightmap_uv2"], p_options["generate_lightmap_uv2_texel_size"], src_lightmap_cache, p_options["scale_mesh"], p_options["offset_mesh"], p_options["force_disable_mesh_compression"], mesh_lightmap_caches, nullptr);
+
+	if (mesh_lightmap_caches.size()) {
+		Ref<FileAccess> f = FileAccess::open(p_source_file + ".unwrap_cache", FileAccess::WRITE);
+		if (f.is_valid()) {
+			f->store_32(mesh_lightmap_caches.size());
+			for (int i = 0; i < mesh_lightmap_caches.size(); i++) {
+				String md5 = String::md5(mesh_lightmap_caches[i].ptr());
+				f->store_buffer(mesh_lightmap_caches[i].ptr(), mesh_lightmap_caches[i].size());
+			}
+		}
+	}
+	err = OK;
+
+	ERR_FAIL_COND_V(err != OK, err);
+	ERR_FAIL_COND_V(meshes.size() != 1, ERR_BUG);
+
+	String save_path = p_save_path + ".mesh";
+
+	err = ResourceSaver::save(meshes.front()->get()->get_mesh(), save_path);
+
+	ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save Mesh to file '" + save_path + "'.");
+
+	r_gen_files->push_back(save_path);
+
+	return OK;
+}

editor/import/3d/resource_importer_obj.h

@@ -0,0 +1,61 @@
+/**************************************************************************/
+/*  resource_importer_obj.h                                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "resource_importer_scene.h"
+
+class EditorOBJImporter : public EditorSceneFormatImporter {
+	GDCLASS(EditorOBJImporter, EditorSceneFormatImporter);
+
+public:
+	virtual void get_extensions(List<String> *r_extensions) const override;
+	virtual Node *import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err = nullptr) override;
+};
+
+class ResourceImporterOBJ : public ResourceImporter {
+	GDCLASS(ResourceImporterOBJ, ResourceImporter);
+
+public:
+	virtual String get_importer_name() const override;
+	virtual String get_visible_name() const override;
+	virtual void get_recognized_extensions(List<String> *p_extensions) const override;
+	virtual String get_save_extension() const override;
+	virtual String get_resource_type() const override;
+	virtual int get_format_version() const override;
+
+	virtual int get_preset_count() const override;
+	virtual String get_preset_name(int p_idx) const override;
+
+	virtual void get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset = 0) const override;
+	virtual bool get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const override;
+
+	virtual Error import(ResourceUID::ID p_source_id, const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = nullptr, Variant *r_metadata = nullptr) override;
+};

editor/import/3d/resource_importer_scene.h

@@ -0,0 +1,520 @@
+/**************************************************************************/
+/*  resource_importer_scene.h                                             */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "core/error/error_macros.h"
+#include "core/io/resource_importer.h"
+#include "core/variant/dictionary.h"
+#include "scene/3d/importer_mesh_instance_3d.h"
+#include "scene/resources/3d/box_shape_3d.h"
+#include "scene/resources/3d/capsule_shape_3d.h"
+#include "scene/resources/3d/cylinder_shape_3d.h"
+#include "scene/resources/3d/importer_mesh.h"
+#include "scene/resources/3d/sphere_shape_3d.h"
+#include "scene/resources/animation.h"
+#include "scene/resources/mesh.h"
+
+class AnimationPlayer;
+class ImporterMesh;
+class Material;
+
+class EditorSceneFormatImporter : public RefCounted {
+	GDCLASS(EditorSceneFormatImporter, RefCounted);
+
+	List<ResourceImporter::ImportOption> *current_option_list = nullptr;
+
+protected:
+	static void _bind_methods();
+
+	Node *import_scene_wrapper(const String &p_path, uint32_t p_flags, const Dictionary &p_options);
+	Ref<Animation> import_animation_wrapper(const String &p_path, uint32_t p_flags, const Dictionary &p_options);
+
+	GDVIRTUAL0RC(Vector<String>, _get_extensions)
+	GDVIRTUAL3R(Object *, _import_scene, String, uint32_t, Dictionary)
+	GDVIRTUAL1(_get_import_options, String)
+	GDVIRTUAL3RC(Variant, _get_option_visibility, String, bool, String)
+
+public:
+	enum ImportFlags {
+		IMPORT_SCENE = 1,
+		IMPORT_ANIMATION = 2,
+		IMPORT_FAIL_ON_MISSING_DEPENDENCIES = 4,
+		IMPORT_GENERATE_TANGENT_ARRAYS = 8,
+		IMPORT_USE_NAMED_SKIN_BINDS = 16,
+		IMPORT_DISCARD_MESHES_AND_MATERIALS = 32, //used for optimizing animation import
+		IMPORT_FORCE_DISABLE_MESH_COMPRESSION = 64,
+	};
+
+	void add_import_option(const String &p_name, const Variant &p_default_value);
+	void add_import_option_advanced(Variant::Type p_type, const String &p_name, const Variant &p_default_value, PropertyHint p_hint = PROPERTY_HINT_NONE, const String &p_hint_string = String(), int p_usage_flags = PROPERTY_USAGE_DEFAULT);
+	virtual void get_extensions(List<String> *r_extensions) const;
+	virtual Node *import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err = nullptr);
+	virtual void get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options);
+	virtual Variant get_option_visibility(const String &p_path, const String &p_scene_import_type, const String &p_option, const HashMap<StringName, Variant> &p_options);
+	virtual void handle_compatibility_options(HashMap<StringName, Variant> &p_import_params) const {}
+};
+
+class EditorScenePostImport : public RefCounted {
+	GDCLASS(EditorScenePostImport, RefCounted);
+
+	String source_file;
+
+protected:
+	static void _bind_methods();
+
+	GDVIRTUAL1R(Object *, _post_import, Node *)
+
+public:
+	String get_source_file() const;
+	virtual Node *post_import(Node *p_scene);
+	virtual void init(const String &p_source_file);
+};
+
+class EditorScenePostImportPlugin : public RefCounted {
+	GDCLASS(EditorScenePostImportPlugin, RefCounted);
+
+public:
+	enum InternalImportCategory {
+		INTERNAL_IMPORT_CATEGORY_NODE,
+		INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE,
+		INTERNAL_IMPORT_CATEGORY_MESH,
+		INTERNAL_IMPORT_CATEGORY_MATERIAL,
+		INTERNAL_IMPORT_CATEGORY_ANIMATION,
+		INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE,
+		INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE,
+		INTERNAL_IMPORT_CATEGORY_MAX
+	};
+
+private:
+	mutable const HashMap<StringName, Variant> *current_options = nullptr;
+	mutable const Dictionary *current_options_dict = nullptr;
+	List<ResourceImporter::ImportOption> *current_option_list = nullptr;
+	InternalImportCategory current_category = INTERNAL_IMPORT_CATEGORY_MAX;
+
+protected:
+	GDVIRTUAL1(_get_internal_import_options, int)
+	GDVIRTUAL3RC(Variant, _get_internal_option_visibility, int, bool, String)
+	GDVIRTUAL2RC(Variant, _get_internal_option_update_view_required, int, String)
+	GDVIRTUAL4(_internal_process, int, Node *, Node *, Ref<Resource>)
+	GDVIRTUAL1(_get_import_options, String)
+	GDVIRTUAL3RC(Variant, _get_option_visibility, String, bool, String)
+	GDVIRTUAL1(_pre_process, Node *)
+	GDVIRTUAL1(_post_process, Node *)
+
+	static void _bind_methods();
+
+public:
+	Variant get_option_value(const StringName &p_name) const;
+	void add_import_option(const String &p_name, const Variant &p_default_value);
+	void add_import_option_advanced(Variant::Type p_type, const String &p_name, const Variant &p_default_value, PropertyHint p_hint = PROPERTY_HINT_NONE, const String &p_hint_string = String(), int p_usage_flags = PROPERTY_USAGE_DEFAULT);
+
+	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options);
+	virtual Variant get_internal_option_visibility(InternalImportCategory p_category, const String &p_scene_import_type, const String &p_option, const HashMap<StringName, Variant> &p_options) const;
+	virtual Variant get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const;
+
+	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options);
+
+	virtual void get_import_options(const String &p_path, List<ResourceImporter::ImportOption> *r_options);
+	virtual Variant get_option_visibility(const String &p_path, const String &p_scene_import_type, const String &p_option, const HashMap<StringName, Variant> &p_options) const;
+
+	virtual void pre_process(Node *p_scene, const HashMap<StringName, Variant> &p_options);
+	virtual void post_process(Node *p_scene, const HashMap<StringName, Variant> &p_options);
+};
+
+VARIANT_ENUM_CAST(EditorScenePostImportPlugin::InternalImportCategory)
+
+class ResourceImporterScene : public ResourceImporter {
+	GDCLASS(ResourceImporterScene, ResourceImporter);
+
+	static Vector<Ref<EditorSceneFormatImporter>> scene_importers;
+	static Vector<Ref<EditorScenePostImportPlugin>> post_importer_plugins;
+
+	static ResourceImporterScene *scene_singleton;
+	static ResourceImporterScene *animation_singleton;
+
+	enum LightBakeMode {
+		LIGHT_BAKE_DISABLED,
+		LIGHT_BAKE_STATIC,
+		LIGHT_BAKE_STATIC_LIGHTMAPS,
+		LIGHT_BAKE_DYNAMIC,
+	};
+
+	enum MeshPhysicsMode {
+		MESH_PHYSICS_DISABLED,
+		MESH_PHYSICS_MESH_AND_STATIC_COLLIDER,
+		MESH_PHYSICS_RIGID_BODY_AND_MESH,
+		MESH_PHYSICS_STATIC_COLLIDER_ONLY,
+		MESH_PHYSICS_AREA_ONLY,
+	};
+
+	enum NavMeshMode {
+		NAVMESH_DISABLED,
+		NAVMESH_MESH_AND_NAVMESH,
+		NAVMESH_NAVMESH_ONLY,
+	};
+
+	enum OccluderMode {
+		OCCLUDER_DISABLED,
+		OCCLUDER_MESH_AND_OCCLUDER,
+		OCCLUDER_OCCLUDER_ONLY,
+	};
+
+	enum MeshOverride {
+		MESH_OVERRIDE_DEFAULT,
+		MESH_OVERRIDE_ENABLE,
+		MESH_OVERRIDE_DISABLE,
+	};
+
+	enum BodyType {
+		BODY_TYPE_STATIC,
+		BODY_TYPE_DYNAMIC,
+		BODY_TYPE_AREA
+	};
+
+	enum ShapeType {
+		SHAPE_TYPE_DECOMPOSE_CONVEX,
+		SHAPE_TYPE_SIMPLE_CONVEX,
+		SHAPE_TYPE_TRIMESH,
+		SHAPE_TYPE_BOX,
+		SHAPE_TYPE_SPHERE,
+		SHAPE_TYPE_CYLINDER,
+		SHAPE_TYPE_CAPSULE,
+		SHAPE_TYPE_AUTOMATIC,
+	};
+
+	static Error _check_resource_save_paths(ResourceUID::ID p_source_id, const String &p_hash_suffix, const Dictionary &p_data);
+	Array _get_skinned_pose_transforms(ImporterMeshInstance3D *p_src_mesh_node);
+	void _replace_owner(Node *p_node, Node *p_scene, Node *p_new_owner);
+	Node *_generate_meshes(Node *p_node, const Dictionary &p_mesh_data, bool p_generate_lods, bool p_create_shadow_meshes, LightBakeMode p_light_bake_mode, float p_lightmap_texel_size, const Vector<uint8_t> &p_src_lightmap_cache, Vector<Vector<uint8_t>> &r_lightmap_caches);
+	void _add_shapes(Node *p_node, const Vector<Ref<Shape3D>> &p_shapes);
+	void _copy_meta(Object *p_src_object, Object *p_dst_object);
+	Node *_replace_node_with_type_and_script(Node *p_node, String p_node_type, Ref<Script> p_script);
+
+	enum AnimationImportTracks {
+		ANIMATION_IMPORT_TRACKS_IF_PRESENT,
+		ANIMATION_IMPORT_TRACKS_IF_PRESENT_FOR_ALL,
+		ANIMATION_IMPORT_TRACKS_NEVER,
+	};
+	enum TrackChannel {
+		TRACK_CHANNEL_POSITION,
+		TRACK_CHANNEL_ROTATION,
+		TRACK_CHANNEL_SCALE,
+		TRACK_CHANNEL_BLEND_SHAPE,
+		TRACK_CHANNEL_MAX
+	};
+
+	void _optimize_track_usage(AnimationPlayer *p_player, AnimationImportTracks *p_track_actions);
+
+	String _scene_import_type = "PackedScene";
+
+public:
+	static const String material_extension[3];
+	static ResourceImporterScene *get_scene_singleton() { return scene_singleton; }
+	static ResourceImporterScene *get_animation_singleton() { return animation_singleton; }
+
+	static void add_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin, bool p_first_priority = false);
+	static void remove_post_importer_plugin(const Ref<EditorScenePostImportPlugin> &p_plugin);
+
+	const Vector<Ref<EditorSceneFormatImporter>> &get_scene_importers() const { return scene_importers; }
+	static void add_scene_importer(Ref<EditorSceneFormatImporter> p_importer, bool p_first_priority = false);
+	static void remove_scene_importer(Ref<EditorSceneFormatImporter> p_importer);
+	static void get_scene_importer_extensions(List<String> *p_extensions);
+
+	static void clean_up_importer_plugins();
+
+	String get_scene_import_type() const { return _scene_import_type; }
+	void set_scene_import_type(const String &p_type) { _scene_import_type = p_type; }
+
+	virtual String get_importer_name() const override;
+	virtual String get_visible_name() const override;
+	virtual void get_recognized_extensions(List<String> *p_extensions) const override;
+	virtual String get_save_extension() const override;
+	virtual String get_resource_type() const override;
+	virtual int get_format_version() const override;
+
+	virtual int get_preset_count() const override;
+	virtual String get_preset_name(int p_idx) const override;
+
+	enum InternalImportCategory {
+		INTERNAL_IMPORT_CATEGORY_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_NODE,
+		INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH_3D_NODE,
+		INTERNAL_IMPORT_CATEGORY_MESH = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MESH,
+		INTERNAL_IMPORT_CATEGORY_MATERIAL = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MATERIAL,
+		INTERNAL_IMPORT_CATEGORY_ANIMATION = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION,
+		INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_ANIMATION_NODE,
+		INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_SKELETON_3D_NODE,
+		INTERNAL_IMPORT_CATEGORY_MAX = EditorScenePostImportPlugin::INTERNAL_IMPORT_CATEGORY_MAX
+	};
+
+	void get_internal_import_options(InternalImportCategory p_category, List<ImportOption> *r_options) const;
+	bool get_internal_option_visibility(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const;
+	bool get_internal_option_update_view_required(InternalImportCategory p_category, const String &p_option, const HashMap<StringName, Variant> &p_options) const;
+
+	virtual void get_import_options(const String &p_path, List<ImportOption> *r_options, int p_preset = 0) const override;
+	virtual bool get_option_visibility(const String &p_path, const String &p_option, const HashMap<StringName, Variant> &p_options) const override;
+	virtual void handle_compatibility_options(HashMap<StringName, Variant> &p_import_params) const override;
+	// Import scenes *after* everything else (such as textures).
+	virtual int get_import_order() const override { return ResourceImporter::IMPORT_ORDER_SCENE; }
+
+	void _pre_fix_global(Node *p_scene, const HashMap<StringName, Variant> &p_options) const;
+	Node *_pre_fix_node(Node *p_node, Node *p_root, HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &r_collision_map, Pair<PackedVector3Array, PackedInt32Array> *r_occluder_arrays, List<Pair<NodePath, Node *>> &r_node_renames, const HashMap<StringName, Variant> &p_options);
+	Node *_pre_fix_animations(Node *p_node, Node *p_root, const Dictionary &p_node_data, const Dictionary &p_animation_data, float p_animation_fps);
+	Node *_post_fix_node(Node *p_node, Node *p_root, HashMap<Ref<ImporterMesh>, Vector<Ref<Shape3D>>> &collision_map, Pair<PackedVector3Array, PackedInt32Array> &r_occluder_arrays, HashSet<Ref<ImporterMesh>> &r_scanned_meshes, const Dictionary &p_node_data, const Dictionary &p_material_data, const Dictionary &p_animation_data, float p_animation_fps, float p_applied_root_scale, const String &p_source_file, const HashMap<StringName, Variant> &p_options);
+	Node *_post_fix_animations(Node *p_node, Node *p_root, const Dictionary &p_node_data, const Dictionary &p_animation_data, float p_animation_fps, bool p_remove_immutable_tracks);
+
+	Ref<Animation> _save_animation_to_file(Ref<Animation> anim, bool p_save_to_file, const String &p_save_to_path, bool p_keep_custom_tracks);
+	void _create_slices(AnimationPlayer *ap, Ref<Animation> anim, const Array &p_clips, bool p_bake_all);
+	void _optimize_animations(AnimationPlayer *anim, float p_max_vel_error, float p_max_ang_error, int p_prc_error);
+	void _compress_animations(AnimationPlayer *anim, int p_page_size_kb);
+
+	Node *pre_import(const String &p_source_file, const HashMap<StringName, Variant> &p_options);
+	virtual Error import(ResourceUID::ID p_source_id, const String &p_source_file, const String &p_save_path, const HashMap<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files = nullptr, Variant *r_metadata = nullptr) override;
+
+	virtual bool has_advanced_options() const override;
+	virtual void show_advanced_options(const String &p_path) override;
+
+	ResourceImporterScene(const String &p_scene_import_type = "PackedScene", bool p_singleton = false);
+	~ResourceImporterScene();
+
+	template <typename M>
+	static Vector<Ref<Shape3D>> get_collision_shapes(const Ref<ImporterMesh> &p_mesh, const M &p_options, float p_applied_root_scale);
+
+	template <typename M>
+	static Transform3D get_collision_shapes_transform(const M &p_options);
+};
+
+class EditorSceneFormatImporterESCN : public EditorSceneFormatImporter {
+	GDCLASS(EditorSceneFormatImporterESCN, EditorSceneFormatImporter);
+
+public:
+	virtual void get_extensions(List<String> *r_extensions) const override;
+	virtual Node *import_scene(const String &p_path, uint32_t p_flags, const HashMap<StringName, Variant> &p_options, List<String> *r_missing_deps, Error *r_err = nullptr) override;
+};
+
+template <typename M>
+Vector<Ref<Shape3D>> ResourceImporterScene::get_collision_shapes(const Ref<ImporterMesh> &p_mesh, const M &p_options, float p_applied_root_scale) {
+	ERR_FAIL_COND_V(p_mesh.is_null(), Vector<Ref<Shape3D>>());
+
+	ShapeType generate_shape_type = SHAPE_TYPE_AUTOMATIC;
+	if (p_options.has(SNAME("physics/shape_type"))) {
+		generate_shape_type = (ShapeType)p_options[SNAME("physics/shape_type")].operator int();
+	}
+
+	if (generate_shape_type == SHAPE_TYPE_AUTOMATIC) {
+		BodyType body_type = BODY_TYPE_STATIC;
+		if (p_options.has(SNAME("physics/body_type"))) {
+			body_type = (BodyType)p_options[SNAME("physics/body_type")].operator int();
+		}
+
+		generate_shape_type = body_type == BODY_TYPE_DYNAMIC ? SHAPE_TYPE_DECOMPOSE_CONVEX : SHAPE_TYPE_TRIMESH;
+	}
+
+	if (generate_shape_type == SHAPE_TYPE_DECOMPOSE_CONVEX) {
+		Ref<MeshConvexDecompositionSettings> decomposition_settings = Ref<MeshConvexDecompositionSettings>();
+		decomposition_settings.instantiate();
+		bool advanced = false;
+		if (p_options.has(SNAME("decomposition/advanced"))) {
+			advanced = p_options[SNAME("decomposition/advanced")];
+		}
+
+		if (advanced) {
+			if (p_options.has(SNAME("decomposition/max_concavity"))) {
+				decomposition_settings->set_max_concavity(p_options[SNAME("decomposition/max_concavity")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/symmetry_planes_clipping_bias"))) {
+				decomposition_settings->set_symmetry_planes_clipping_bias(p_options[SNAME("decomposition/symmetry_planes_clipping_bias")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/revolution_axes_clipping_bias"))) {
+				decomposition_settings->set_revolution_axes_clipping_bias(p_options[SNAME("decomposition/revolution_axes_clipping_bias")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/min_volume_per_convex_hull"))) {
+				decomposition_settings->set_min_volume_per_convex_hull(p_options[SNAME("decomposition/min_volume_per_convex_hull")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/resolution"))) {
+				decomposition_settings->set_resolution(p_options[SNAME("decomposition/resolution")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/max_num_vertices_per_convex_hull"))) {
+				decomposition_settings->set_max_num_vertices_per_convex_hull(p_options[SNAME("decomposition/max_num_vertices_per_convex_hull")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/plane_downsampling"))) {
+				decomposition_settings->set_plane_downsampling(p_options[SNAME("decomposition/plane_downsampling")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/convexhull_downsampling"))) {
+				decomposition_settings->set_convex_hull_downsampling(p_options[SNAME("decomposition/convexhull_downsampling")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/normalize_mesh"))) {
+				decomposition_settings->set_normalize_mesh(p_options[SNAME("decomposition/normalize_mesh")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/mode"))) {
+				decomposition_settings->set_mode((MeshConvexDecompositionSettings::Mode)p_options[SNAME("decomposition/mode")].operator int());
+			}
+
+			if (p_options.has(SNAME("decomposition/convexhull_approximation"))) {
+				decomposition_settings->set_convex_hull_approximation(p_options[SNAME("decomposition/convexhull_approximation")]);
+			}
+
+			if (p_options.has(SNAME("decomposition/max_convex_hulls"))) {
+				decomposition_settings->set_max_convex_hulls(MAX(1, (int)p_options[SNAME("decomposition/max_convex_hulls")]));
+			}
+
+			if (p_options.has(SNAME("decomposition/project_hull_vertices"))) {
+				decomposition_settings->set_project_hull_vertices(p_options[SNAME("decomposition/project_hull_vertices")]);
+			}
+		} else {
+			int precision_level = 5;
+			if (p_options.has(SNAME("decomposition/precision"))) {
+				precision_level = p_options[SNAME("decomposition/precision")];
+			}
+
+			const real_t precision = real_t(precision_level - 1) / 9.0;
+
+			decomposition_settings->set_max_concavity(Math::lerp(real_t(1.0), real_t(0.001), precision));
+			decomposition_settings->set_min_volume_per_convex_hull(Math::lerp(real_t(0.01), real_t(0.0001), precision));
+			decomposition_settings->set_resolution(Math::lerp(10'000, 100'000, precision));
+			decomposition_settings->set_max_num_vertices_per_convex_hull(Math::lerp(32, 64, precision));
+			decomposition_settings->set_plane_downsampling(Math::lerp(3, 16, precision));
+			decomposition_settings->set_convex_hull_downsampling(Math::lerp(3, 16, precision));
+			decomposition_settings->set_max_convex_hulls(Math::lerp(1, 32, precision));
+		}
+
+		return p_mesh->convex_decompose(decomposition_settings);
+	} else if (generate_shape_type == SHAPE_TYPE_SIMPLE_CONVEX) {
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(p_mesh->create_convex_shape(true, /*Passing false, otherwise VHACD will be used to simplify (Decompose) the Mesh.*/ false));
+		return shapes;
+	} else if (generate_shape_type == SHAPE_TYPE_TRIMESH) {
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(p_mesh->create_trimesh_shape());
+		return shapes;
+	} else if (generate_shape_type == SHAPE_TYPE_BOX) {
+		Ref<BoxShape3D> box;
+		box.instantiate();
+		if (p_options.has(SNAME("primitive/size"))) {
+			box->set_size(p_options[SNAME("primitive/size")].operator Vector3() * p_applied_root_scale);
+		} else {
+			box->set_size(Vector3(2, 2, 2) * p_applied_root_scale);
+		}
+
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(box);
+		return shapes;
+
+	} else if (generate_shape_type == SHAPE_TYPE_SPHERE) {
+		Ref<SphereShape3D> sphere;
+		sphere.instantiate();
+		if (p_options.has(SNAME("primitive/radius"))) {
+			sphere->set_radius(p_options[SNAME("primitive/radius")].operator float() * p_applied_root_scale);
+		} else {
+			sphere->set_radius(1.0f * p_applied_root_scale);
+		}
+
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(sphere);
+		return shapes;
+	} else if (generate_shape_type == SHAPE_TYPE_CYLINDER) {
+		Ref<CylinderShape3D> cylinder;
+		cylinder.instantiate();
+		if (p_options.has(SNAME("primitive/height"))) {
+			cylinder->set_height(p_options[SNAME("primitive/height")].operator float() * p_applied_root_scale);
+		} else {
+			cylinder->set_height(1.0f * p_applied_root_scale);
+		}
+		if (p_options.has(SNAME("primitive/radius"))) {
+			cylinder->set_radius(p_options[SNAME("primitive/radius")].operator float() * p_applied_root_scale);
+		} else {
+			cylinder->set_radius(1.0f * p_applied_root_scale);
+		}
+
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(cylinder);
+		return shapes;
+	} else if (generate_shape_type == SHAPE_TYPE_CAPSULE) {
+		Ref<CapsuleShape3D> capsule;
+		capsule.instantiate();
+		if (p_options.has(SNAME("primitive/height"))) {
+			capsule->set_height(p_options[SNAME("primitive/height")].operator float() * p_applied_root_scale);
+		} else {
+			capsule->set_height(1.0f * p_applied_root_scale);
+		}
+		if (p_options.has(SNAME("primitive/radius"))) {
+			capsule->set_radius(p_options[SNAME("primitive/radius")].operator float() * p_applied_root_scale);
+		} else {
+			capsule->set_radius(1.0f * p_applied_root_scale);
+		}
+
+		Vector<Ref<Shape3D>> shapes;
+		shapes.push_back(capsule);
+		return shapes;
+	}
+	return Vector<Ref<Shape3D>>();
+}
+
+template <typename M>
+Transform3D ResourceImporterScene::get_collision_shapes_transform(const M &p_options) {
+	Transform3D transform;
+
+	ShapeType generate_shape_type = SHAPE_TYPE_AUTOMATIC;
+	if (p_options.has(SNAME("physics/shape_type"))) {
+		generate_shape_type = (ShapeType)p_options[SNAME("physics/shape_type")].operator int();
+	}
+
+	if (generate_shape_type == SHAPE_TYPE_AUTOMATIC) {
+		BodyType body_type = BODY_TYPE_STATIC;
+		if (p_options.has(SNAME("physics/body_type"))) {
+			body_type = (BodyType)p_options[SNAME("physics/body_type")].operator int();
+		}
+
+		generate_shape_type = body_type == BODY_TYPE_DYNAMIC ? SHAPE_TYPE_DECOMPOSE_CONVEX : SHAPE_TYPE_TRIMESH;
+	}
+
+	if (generate_shape_type == SHAPE_TYPE_BOX ||
+			generate_shape_type == SHAPE_TYPE_SPHERE ||
+			generate_shape_type == SHAPE_TYPE_CYLINDER ||
+			generate_shape_type == SHAPE_TYPE_CAPSULE) {
+		if (p_options.has(SNAME("primitive/position"))) {
+			transform.origin = p_options[SNAME("primitive/position")];
+		}
+
+		if (p_options.has(SNAME("primitive/rotation"))) {
+			transform.basis = Basis::from_euler(p_options[SNAME("primitive/rotation")].operator Vector3() * (Math::PI / 180.0));
+		}
+	}
+	return transform;
+}

editor/import/3d/scene_import_settings.h

@@ -0,0 +1,254 @@
+/**************************************************************************/
+/*  scene_import_settings.h                                               */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#pragma once
+
+#include "editor/import/3d/resource_importer_scene.h"
+#include "scene/3d/camera_3d.h"
+#include "scene/3d/light_3d.h"
+#include "scene/3d/mesh_instance_3d.h"
+#include "scene/3d/skeleton_3d.h"
+#include "scene/gui/dialogs.h"
+#include "scene/gui/menu_button.h"
+#include "scene/gui/option_button.h"
+#include "scene/gui/panel_container.h"
+#include "scene/gui/slider.h"
+#include "scene/gui/split_container.h"
+#include "scene/gui/tab_container.h"
+#include "scene/gui/tree.h"
+#include "scene/resources/3d/primitive_meshes.h"
+#include "scene/resources/3d/sky_material.h"
+
+class EditorFileDialog;
+class EditorInspector;
+class SceneImportSettingsData;
+
+class SceneImportSettingsDialog : public ConfirmationDialog {
+	GDCLASS(SceneImportSettingsDialog, ConfirmationDialog)
+
+	static SceneImportSettingsDialog *singleton;
+
+	enum Actions {
+		ACTION_EXTRACT_MATERIALS,
+		ACTION_CHOOSE_MESH_SAVE_PATHS,
+		ACTION_CHOOSE_ANIMATION_SAVE_PATHS,
+	};
+
+	Node *scene = nullptr;
+
+	HSplitContainer *tree_split = nullptr;
+	HSplitContainer *property_split = nullptr;
+	TabContainer *data_mode = nullptr;
+	Tree *scene_tree = nullptr;
+	Tree *mesh_tree = nullptr;
+	Tree *material_tree = nullptr;
+
+	EditorInspector *inspector = nullptr;
+
+	SubViewport *base_viewport = nullptr;
+
+	Camera3D *camera = nullptr;
+	Ref<CameraAttributesPractical> camera_attributes;
+	Ref<Environment> environment;
+	Ref<Sky> sky;
+	Ref<ProceduralSkyMaterial> procedural_sky_material;
+	bool first_aabb = false;
+	AABB contents_aabb;
+
+	Button *light_1_switch = nullptr;
+	Button *light_2_switch = nullptr;
+	Button *light_rotate_switch = nullptr;
+
+	struct ThemeCache {
+		Ref<Texture2D> light_1_icon;
+		Ref<Texture2D> light_2_icon;
+		Ref<Texture2D> rotate_icon;
+	} theme_cache;
+
+	DirectionalLight3D *light1 = nullptr;
+	DirectionalLight3D *light2 = nullptr;
+	Ref<ArrayMesh> selection_mesh;
+	MeshInstance3D *node_selected = nullptr;
+
+	MeshInstance3D *mesh_preview = nullptr;
+	Ref<SphereMesh> material_preview;
+
+	AnimationPlayer *animation_player = nullptr;
+	List<Skeleton3D *> skeletons;
+	PanelContainer *animation_preview = nullptr;
+	HSlider *animation_slider = nullptr;
+	Button *animation_play_button = nullptr;
+	Button *animation_stop_button = nullptr;
+	Button *animation_toggle_skeleton_visibility = nullptr;
+	Animation::LoopMode animation_loop_mode = Animation::LOOP_NONE;
+	bool animation_pingpong = false;
+	bool previous_import_as_skeleton = false;
+	bool previous_rest_as_reset = false;
+	MeshInstance3D *bones_mesh_preview = nullptr;
+
+	Ref<StandardMaterial3D> collider_mat;
+
+	float cam_rot_x = 0.0f;
+	float cam_rot_y = 0.0f;
+	float cam_zoom = 0.0f;
+
+	void _update_scene();
+
+	struct MaterialData {
+		bool has_import_id;
+		Ref<Material> material;
+		TreeItem *scene_node = nullptr;
+		TreeItem *mesh_node = nullptr;
+		TreeItem *material_node = nullptr;
+
+		float cam_rot_x = -Math::PI / 4;
+		float cam_rot_y = -Math::PI / 4;
+		float cam_zoom = 1;
+
+		HashMap<StringName, Variant> settings;
+	};
+	HashMap<String, MaterialData> material_map;
+	HashMap<Ref<Material>, String> unnamed_material_name_map;
+
+	struct MeshData {
+		bool has_import_id;
+		Ref<Mesh> mesh;
+		TreeItem *scene_node = nullptr;
+		TreeItem *mesh_node = nullptr;
+
+		float cam_rot_x = -Math::PI / 4;
+		float cam_rot_y = -Math::PI / 4;
+		float cam_zoom = 1;
+		HashMap<StringName, Variant> settings;
+	};
+	HashMap<String, MeshData> mesh_map;
+
+	struct AnimationData {
+		Ref<Animation> animation;
+		TreeItem *scene_node = nullptr;
+		HashMap<StringName, Variant> settings;
+	};
+	HashMap<String, AnimationData> animation_map;
+
+	struct NodeData {
+		Node *node = nullptr;
+		TreeItem *scene_node = nullptr;
+		HashMap<StringName, Variant> settings;
+	};
+	HashMap<String, NodeData> node_map;
+
+	bool _get_current(const StringName &p_name, Variant &r_ret) const;
+	void _set_default(const StringName &p_name, const Variant &p_value);
+	void _fill_material(Tree *p_tree, const Ref<Material> &p_material, TreeItem *p_parent);
+	void _fill_mesh(Tree *p_tree, const Ref<Mesh> &p_mesh, TreeItem *p_parent);
+	void _fill_animation(Tree *p_tree, const Ref<Animation> &p_anim, const String &p_name, TreeItem *p_parent);
+	void _fill_scene(Node *p_node, TreeItem *p_parent_item);
+
+	HashSet<Ref<Mesh>> mesh_set;
+
+	String selected_type;
+	String selected_id;
+
+	bool selecting = false;
+
+	void _update_view_gizmos();
+	void _update_camera();
+	void _select(Tree *p_from, const String &p_type, const String &p_id);
+	void _inspector_property_edited(const String &p_name);
+	void _reset_bone_transforms();
+	void _play_animation();
+	void _stop_current_animation();
+	void _reset_animation(const String &p_animation_name = "");
+	void _animation_slider_value_changed(double p_value);
+	void _animation_finished(const StringName &p_name);
+	void _animation_update_skeleton_visibility();
+	void _material_tree_selected();
+	void _mesh_tree_selected();
+	void _scene_tree_selected();
+	void _skeleton_tree_entered(Skeleton3D *p_skeleton);
+	void _cleanup();
+	void _on_light_1_switch_pressed();
+	void _on_light_2_switch_pressed();
+	void _on_light_rotate_switch_pressed();
+
+	void _viewport_input(const Ref<InputEvent> &p_input);
+
+	HashMap<StringName, Variant> defaults;
+
+	SceneImportSettingsData *scene_import_settings_data = nullptr;
+
+	void _re_import();
+
+	String base_path;
+
+	MenuButton *action_menu = nullptr;
+
+	ConfirmationDialog *external_paths = nullptr;
+	Tree *external_path_tree = nullptr;
+	EditorFileDialog *save_path = nullptr;
+	OptionButton *external_extension_type = nullptr;
+
+	EditorFileDialog *item_save_path = nullptr;
+
+	void _menu_callback(int p_id);
+	void _save_dir_callback(const String &p_path);
+
+	int current_action = 0;
+
+	Vector<TreeItem *> save_path_items;
+
+	TreeItem *save_path_item = nullptr;
+	void _save_path_changed(const String &p_path);
+	void _browse_save_callback(Object *p_item, int p_column, int p_id, MouseButton p_button);
+	void _save_dir_confirm();
+
+	Dictionary base_subresource_settings;
+
+	void _load_default_subresource_settings(HashMap<StringName, Variant> &settings, const String &p_type, const String &p_import_id, ResourceImporterScene::InternalImportCategory p_category);
+
+	bool editing_animation = false;
+	bool generate_collider = false;
+
+	Timer *update_view_timer = nullptr;
+
+protected:
+	virtual void _update_theme_item_cache() override;
+	void _notification(int p_what);
+
+public:
+	bool is_editing_animation() const { return editing_animation; }
+	void request_generate_collider();
+	void update_view();
+	void open_settings(const String &p_path, const String &p_scene_import_type = "PackedScene");
+	static SceneImportSettingsDialog *get_singleton();
+	Node *get_selected_node();
+	SceneImportSettingsDialog();
+	~SceneImportSettingsDialog();
+};