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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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4
servers/rendering/rendering_server_default.h
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@@ -702,10 +702,10 @@ public:
FUNC2(instance_geometry_set_cast_shadows_setting, RID, ShadowCastingSetting)
FUNC2(instance_geometry_set_material_override, RID, RID)
FUNC5(instance_geometry_set_visibility_range, RID, float, float, float, float)
FUNC6(instance_geometry_set_visibility_range, RID, float, float, float, float, VisibilityRangeFadeMode)
FUNC4(instance_geometry_set_lightmap, RID, RID, const Rect2 &, int)
FUNC2(instance_geometry_set_lod_bias, RID, float)
FUNC2(instance_geometry_set_transparency, RID, float)
FUNC3(instance_geometry_set_shader_parameter, RID, const StringName &, const Variant &)
FUNC2RC(Variant, instance_geometry_get_shader_parameter, RID, const StringName &)
FUNC2RC(Variant, instance_geometry_get_shader_parameter_default_value, RID, const StringName &)