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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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3
servers/rendering/renderer_scene_render.h
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@@ -56,6 +56,9 @@ public:
virtual void geometry_instance_set_transform(GeometryInstance *p_geometry_instance, const Transform3D &p_transform, const AABB &p_aabb, const AABB &p_transformed_aabbb) = 0;
virtual void geometry_instance_set_layer_mask(GeometryInstance *p_geometry_instance, uint32_t p_layer_mask) = 0;
virtual void geometry_instance_set_lod_bias(GeometryInstance *p_geometry_instance, float p_lod_bias) = 0;
virtual void geometry_instance_set_transparency(GeometryInstance *p_geometry_instance, float p_transparency) = 0;
virtual void geometry_instance_set_fade_range(GeometryInstance *p_geometry_instance, bool p_enable_near, float p_near_begin, float p_near_end, bool p_enable_far, float p_far_begin, float p_far_end) = 0;
virtual void geometry_instance_set_parent_fade_alpha(GeometryInstance *p_geometry_instance, float p_alpha) = 0;
virtual void geometry_instance_set_use_baked_light(GeometryInstance *p_geometry_instance, bool p_enable) = 0;
virtual void geometry_instance_set_use_dynamic_gi(GeometryInstance *p_geometry_instance, bool p_enable) = 0;
virtual void geometry_instance_set_use_lightmap(GeometryInstance *p_geometry_instance, RID p_lightmap_instance, const Rect2 &p_lightmap_uv_scale, int p_lightmap_slice_index) = 0;