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Implement distance fade and transparency

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The built-in ALPHA in spatial shaders comes pre-set with a per-instance
transparency value. Multiply by it if you want to keep it.

The transparency value of any given GeometryInstance3D is affected by:
   - Its new "transparency" property.
   - Its own visiblity range when the new "visibility_range_fade_mode"
     property is set to "Self".
   - Its parent visibility range when the parent's fade mode is
     set to "Dependencies".

The "Self" mode will fade-out the instance when reaching the visibility
range limits, while the "Dependencies" mode will fade-in its
dependencies.

Per-instance transparency is only implemented in the forward clustered
renderer, support for mobile should be added in the future.

Co-authored-by: reduz <reduzio@gmail.com>
This commit is contained in:
JFonS
2021-07-20 15:17:34 -03:00
committed by jfons
parent 88d9914519
commit c571e4a7f4
21 changed files with 371 additions and 92 deletions
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2
scene/resources/material.cpp
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@@ -1086,7 +1086,7 @@ void BaseMaterial3D::_update_shader() {
code += " ALPHA = 1.0;\n";
} else if (transparency != TRANSPARENCY_DISABLED || flags[FLAG_USE_SHADOW_TO_OPACITY] || (distance_fade == DISTANCE_FADE_PIXEL_ALPHA) || proximity_fade_enabled) {
code += " ALPHA = albedo.a * albedo_tex.a;\n";
code += " ALPHA *= albedo.a * albedo_tex.a;\n";
}
if (transparency == TRANSPARENCY_ALPHA_HASH) {
code += " ALPHA_HASH_SCALE = alpha_hash_scale;\n";