Alter Camera3D FOV bounds error conditions from between 1 and 179 inclusive to between 0 and 180 exclusive.

This is to allow for vertical viewing angles of less than one, for virtual broadcast productions and real world lens matching. Most 40x sports broadcast lenses have a sub one degree vertical viewing angle, as do most zoom lenses with extenders. At present Godot cannot be used for a good deal of virtual production / sports AR scenarios.

Tested on 4.6, no attempt made to change the editor hint as it remains sensible for most use cases.

scene/3d/camera_3d.cpp

@@ -729,7 +729,7 @@ Camera3D::ProjectionType Camera3D::get_projection() const {
 }
 
 void Camera3D::set_fov(real_t p_fov) {
-	ERR_FAIL_COND(p_fov < 1 || p_fov > 179);
+	ERR_FAIL_COND(p_fov <= CMP_EPSILON || p_fov >= 180.0 - CMP_EPSILON);
 	fov = p_fov;
 	_update_camera_mode();
 }