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BlueRose 2025-02-13 12:49:39 +08:00
parent 5321a467c5
commit 152f067a54
1 changed files with 4 additions and 4 deletions
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8
03-UnrealEngine/Rendering/RenderingPipeline/Lighting/Lighting.md
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@ -663,7 +663,7 @@ void GetShadowTerms(float SceneDepth, half4 PrecomputedShadowFactors, uint Shadi
half StaticShadowing = 1.0f; half StaticShadowing = 1.0f;
#endif #endif
if (LightData.bRadialLight || SHADING_PATH_MOBILE)//一般是 PointLight or SpotLight。径向衰减（radial attenuation）：指光照强度随距离光源的远近而衰减的特性（通常遵循平方反比定律）。 if (LightData.bRadialLight || SHADING_PATH_MOBILE)//RadialLight或者是移动端使用以下逻辑。bRadialLight一般是 PointLight or SpotLight。径向衰减（radial attenuation）：指光照强度随距离光源的远近而衰减的特性（通常遵循平方反比定律）。
{ {
// Remapping the light attenuation buffer (see ShadowRendering.cpp) // Remapping the light attenuation buffer (see ShadowRendering.cpp)
@ -682,11 +682,11 @@ void GetShadowTerms(float SceneDepth, half4 PrecomputedShadowFactors, uint Shadi
float DynamicShadowFraction = DistanceFromCameraFade(SceneDepth, LightData); float DynamicShadowFraction = DistanceFromCameraFade(SceneDepth, LightData);
// For a directional light, fade between static shadowing and the whole scene dynamic shadowing based on distance + per object shadows // For a directional light, fade between static shadowing and the whole scene dynamic shadowing based on distance + per object shadows
Shadow.SurfaceShadow = lerp(LightAttenuation.x, StaticShadowing, DynamicShadowFraction); Shadow.SurfaceShadow = lerp(LightAttenuation.x, StaticShadowing, DynamicShadowFraction);//根据计算出动态阴影的衰减值来插值ShadowProject与静态阴影。x:方向光阴影
// Fade between SSS dynamic shadowing and static shadowing based on distance // Fade between SSS dynamic shadowing and static shadowing based on distance
Shadow.TransmissionShadow = min(lerp(LightAttenuation.y, StaticShadowing, DynamicShadowFraction), LightAttenuation.w); Shadow.TransmissionShadow = min(lerp(LightAttenuation.y, StaticShadowing, DynamicShadowFraction), LightAttenuation.w);// w:per-object SSS shadowing
Shadow.SurfaceShadow *= LightAttenuation.z; Shadow.SurfaceShadow *= LightAttenuation.z;//Light function + per-object shadows in z
Shadow.TransmissionShadow *= LightAttenuation.z; Shadow.TransmissionShadow *= LightAttenuation.z;
// Need this min or backscattering will leak when in shadow which cast by non perobject shadow(Only for directional light) // Need this min or backscattering will leak when in shadow which cast by non perobject shadow(Only for directional light)