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BlueRose 2025-01-08 22:09:25 +08:00
parent ba8b25b537
commit a9d6e139a6
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27
03-UnrealEngine/卡通渲染相关资料/渲染功能/阴影控制/ToonShadow.md
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@ -41,17 +41,36 @@ if(PrimitiveSceneinfo->Proxy->IsToonDisableSelfShadow())
{
const FViewInfo& View = Views[ViewIndex];
const FMatrix& ViewMatrix = View.ShadowViewMatrices.GetViewMatrix()
FVector LightDirection = Lightsceneinfo->Proxy- GetDirection();
const FVector CameraDirection = ViewMatrix.GetColumn(2).GetSafeNonmal()
FVector LightDirection = Lightsceneinfo->Proxy->GetDirection();
const FVector CameraDirection = ViewMatrix.GetColumn(2).GetSafeNormal()
float LightViewBlendFactor = PrimitiveSceneinfo->Proxy->GetToonHalfVienShadowFactor();
Fvector HalfViewLightDir = (LightDirection + ( 1 - LightViewBlendFactor) + CameraDirection * LightViewBlendFactor).GetSafeNormal();
FMatrix FinalCombineMatrix = FNnverseRotationMatrix(HalfViewLightDir.Rotation())
ShadowInitializer.WorldTolight = FinalCombineMatrix;
FMatrix FinalCombineMatrix = FInverseRotationMatrix(HalfViewLightDir.Rotation())
ShadowInitializer.WorldToLight = FinalCombineMatrix;
}
...
}
```
相关代码位于`FDirectionalLightSceneProxy::GetPerObjectProjectedShadowInitializer()`，在在FSceneRenderer::CreatePerObjectProjectedShadow()被调用。
```c++
virtual bool GetPerObjectProjectedShadowInitializer(const FBoxSphereBounds& SubjectBounds,FPerObjectProjectedShadowInitializer& OutInitializer) const override
{
OutInitializer.PreShadowTranslation = -SubjectBounds.Origin;
OutInitializer.WorldToLight = FInverseRotationMatrix(FVector(WorldToLight.M[0][0],WorldToLight.M[1][0],WorldToLight.M[2][0]).GetSafeNormal().Rotation());
OutInitializer.Scales = FVector2D(1.0f / SubjectBounds.SphereRadius,1.0f / SubjectBounds.SphereRadius);
OutInitializer.SubjectBounds = FBoxSphereBounds(FVector::ZeroVector,SubjectBounds.BoxExtent,SubjectBounds.SphereRadius);
OutInitializer.WAxis = FVector4(0,0,0,1);
OutInitializer.MinLightW = -UE_OLD_HALF_WORLD_MAX;
// Reduce casting distance on a directional light
// This is necessary to improve floating point precision in several places, especially when deriving frustum verts from InvReceiverMatrix
// This takes the object size into account to ensure that large objects get an extended distance
OutInitializer.MaxDistanceToCastInLightW = FMath::Clamp(SubjectBounds.SphereRadius * CVarPerObjectCastDistanceRadiusScale.GetValueOnRenderThread(), CVarPerObjectCastDistanceMin.GetValueOnRenderThread(), (float)WORLD_MAX);
return true;
}
```
PS.很有可能需要创建2个Atlas。Atlas的创建位于***FSceneRenderer::AllocateCachedShadowDepthTargets()***。数据存储在***SortedShadowsForShadowDepthPass.ShadowMapAtlases***中。大致由FSceneRenderer::FinishInitDynamicShadows()调用。
**阴影Projection阶段**: