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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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7
servers/rendering_server.cpp
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@@ -2433,6 +2433,7 @@ void RenderingServer::_bind_methods() {
ClassDB::bind_method(D_METHOD("instance_set_blend_shape_weight", "instance", "shape", "weight"), &RenderingServer::instance_set_blend_shape_weight);
ClassDB::bind_method(D_METHOD("instance_set_surface_override_material", "instance", "surface", "material"), &RenderingServer::instance_set_surface_override_material);
ClassDB::bind_method(D_METHOD("instance_set_visible", "instance", "visible"), &RenderingServer::instance_set_visible);
ClassDB::bind_method(D_METHOD("instance_geometry_set_transparency", "instance", "transparency"), &RenderingServer::instance_geometry_set_transparency);
ClassDB::bind_method(D_METHOD("instance_set_custom_aabb", "instance", "aabb"), &RenderingServer::instance_set_custom_aabb);
@@ -2443,7 +2444,7 @@ void RenderingServer::_bind_methods() {
ClassDB::bind_method(D_METHOD("instance_geometry_set_flag", "instance", "flag", "enabled"), &RenderingServer::instance_geometry_set_flag);
ClassDB::bind_method(D_METHOD("instance_geometry_set_cast_shadows_setting", "instance", "shadow_casting_setting"), &RenderingServer::instance_geometry_set_cast_shadows_setting);
ClassDB::bind_method(D_METHOD("instance_geometry_set_material_override", "instance", "material"), &RenderingServer::instance_geometry_set_material_override);
ClassDB::bind_method(D_METHOD("instance_geometry_set_visibility_range", "instance", "min", "max", "min_margin", "max_margin"), &RenderingServer::instance_geometry_set_visibility_range);
ClassDB::bind_method(D_METHOD("instance_geometry_set_visibility_range", "instance", "min", "max", "min_margin", "max_margin", "fade_mode"), &RenderingServer::instance_geometry_set_visibility_range);
ClassDB::bind_method(D_METHOD("instance_geometry_set_lightmap", "instance", "lightmap", "lightmap_uv_scale", "lightmap_slice"), &RenderingServer::instance_geometry_set_lightmap);
ClassDB::bind_method(D_METHOD("instance_geometry_set_lod_bias", "instance", "lod_bias"), &RenderingServer::instance_geometry_set_lod_bias);
@@ -2483,6 +2484,10 @@ void RenderingServer::_bind_methods() {
BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_DOUBLE_SIDED);
BIND_ENUM_CONSTANT(SHADOW_CASTING_SETTING_SHADOWS_ONLY);
BIND_ENUM_CONSTANT(VISIBILITY_RANGE_FADE_DISABLED);
BIND_ENUM_CONSTANT(VISIBILITY_RANGE_FADE_SELF);
BIND_ENUM_CONSTANT(VISIBILITY_RANGE_FADE_DEPENDENCIES);
/* Bake 3D Object */
ClassDB::bind_method(D_METHOD("bake_render_uv2", "base", "material_overrides", "image_size"), &RenderingServer::bake_render_uv2);