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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/renderer_scene.h
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@ -76,6 +76,7 @@ public:
virtual void instance_set_blend_shape_weight(RID p_instance, int p_shape, float p_weight) = 0;
virtual void instance_set_surface_override_material(RID p_instance, int p_surface, RID p_material) = 0;
virtual void instance_set_visible(RID p_instance, bool p_visible) = 0;
virtual void instance_geometry_set_transparency(RID p_instance, float p_transparency) = 0;
virtual void instance_set_custom_aabb(RID p_instance, AABB p_aabb) = 0;
@ -93,10 +94,9 @@ public:
virtual void instance_geometry_set_cast_shadows_setting(RID p_instance, RS::ShadowCastingSetting p_shadow_casting_setting) = 0;
virtual void instance_geometry_set_material_override(RID p_instance, RID p_material) = 0;
virtual void instance_geometry_set_visibility_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin) = 0;
virtual void instance_geometry_set_visibility_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin, RS::VisibilityRangeFadeMode p_fade_mode) = 0;
virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_slice_index) = 0;
virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias) = 0;
virtual void instance_geometry_set_shader_parameter(RID p_instance, const StringName &p_parameter, const Variant &p_value) = 0;
virtual void instance_geometry_get_shader_parameter_list(RID p_instance, List<PropertyInfo> *p_parameters) const = 0;
virtual Variant instance_geometry_get_shader_parameter(RID p_instance, const StringName &p_parameter) const = 0;