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03-UnrealEngine/卡通渲染相关资料/渲染功能/阴影控制/ToonShadow.md
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@ -837,13 +837,70 @@ RDG_EVENT_SCOPE(GraphBuilder, "UnbatchedLights");//batchedLights为没有LightFu
=>
for (int32 LightIndex = UnbatchedLightStart; LightIndex < LumenLightStart; LightIndex++)
=>
if (bDrawShadows){...} => ***RenderDeferredShadowProjections()***
if (bDrawShadows){...} => RenderRayTracingShadows()/***RenderDeferredShadowProjections()***
=>
if (bDirectLighting){...}
if (bDirectLighting){...}
if (bDirectLighting){...} => RenderLight()
if (bUseHairLighting){...}=> RenderLightForHair()
## RenderDeferredShadowProjections()
```c++
void FDeferredShadingSceneRenderer::RenderDeferredShadowProjections(
FRDGBuilder& GraphBuilder,
const FMinimalSceneTextures& SceneTextures,
const FTranslucencyLightingVolumeTextures& TranslucencyLightingVolumeTextures,
const FLightSceneInfo* LightSceneInfo,
FRDGTextureRef ScreenShadowMaskTexture,
FRDGTextureRef ScreenShadowMaskSubPixelTexture)
{
CheckShadowDepthRenderCompleted();
SCOPED_NAMED_EVENT(FDeferredShadingSceneRenderer_RenderShadowProjections, FColor::Emerald);
SCOPE_CYCLE_COUNTER(STAT_ProjectedShadowDrawTime);
RDG_EVENT_SCOPE(GraphBuilder, "ShadowProjectionOnOpaque");
RDG_GPU_STAT_SCOPE(GraphBuilder, ShadowProjection);
const FVisibleLightInfo& VisibleLightInfo = VisibleLightInfos[LightSceneInfo->Id];
const bool bProjectingForForwardShading = false;
RenderShadowProjections(GraphBuilder, SceneTextures, ScreenShadowMaskTexture, ScreenShadowMaskSubPixelTexture, LightSceneInfo, bProjectingForForwardShading);
ShadowSceneRenderer->ApplyVirtualShadowMapProjectionForLight(GraphBuilder, SceneTextures, LightSceneInfo, ScreenShadowMaskTexture, ScreenShadowMaskSubPixelTexture);
RenderCapsuleDirectShadows(GraphBuilder, SceneTextures.UniformBuffer, *LightSceneInfo, ScreenShadowMaskTexture, VisibleLightInfo.CapsuleShadowsToProject, bProjectingForForwardShading);
// Inject deep shadow mask for regular shadow map. When using virtual shadow map, it is directly handled in the shadow kernel.
if (HairStrands::HasViewHairStrandsData(Views))
{
bool bNeedHairShadowMaskPass = false;
const bool bVirtualShadowOnePass = VisibleLightInfo.VirtualShadowMapClipmaps.Num() > 0;
if (!bVirtualShadowOnePass)
{
for (int32 ShadowIndex = 0; ShadowIndex < VisibleLightInfo.ShadowsToProject.Num(); ShadowIndex++)
{
FProjectedShadowInfo* ProjectedShadowInfo = VisibleLightInfo.ShadowsToProject[ShadowIndex];
if (ProjectedShadowInfo->HasVirtualShadowMap())
{
bNeedHairShadowMaskPass = false;
break;
}
else
{
bNeedHairShadowMaskPass = true;
break;
}
}
}
if (bNeedHairShadowMaskPass)
{
RenderHairStrandsShadowMask(GraphBuilder, Views, LightSceneInfo, false /*bForward*/, ScreenShadowMaskTexture);
}
}
}
```
RenderShadowProjections():
1. 取得当前FVisibleLightInfo、FLightSceneProxy；创建FProjectedShadowInfoArray DistanceFieldShadows、NormalShadows。
2. 遍历VisibleLightInfo.ShadowsToProject，按照阴影特征将每个FProjectedShadowInfo加入DistanceFieldShadows、NormalShadows。
# 半程阴影
由晨风&Neverwind提出：