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03-UnrealEngine/Rendering/RenderingPipeline/Materials&MeshDraw/UE5.5 MeshDraw&SceneProxy探索.md
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@ -7,85 +7,14 @@ rating: ⭐
---
# 前言
探索思路：
- [ ] SceneProxy收集机制的改变。
- [ ] GetDynamicMeshElements的调用方式。
- [ ] 在SendRenderDynamicData_Concurrent中添加（模仿USkeletalMeshComponent::SendRenderDynamicData_Concurrent()与FDebugSkelMeshSceneProxy）
# GetDynamicMeshElements
看得出主要在FDynamicMeshElementContext::GatherDynamicMeshElementsForPrimitive()中调用Primitive->Proxy->GetDynamicMeshElements()。
# 问题解决方法
添加相关性overrider，将bDynamicRelevance设置成true。
```c++
UE::Tasks::FTask FDynamicMeshElementContext::LaunchAsyncTask(FDynamicPrimitiveIndexQueue* PrimitiveIndexQueue, UE::Tasks::ETaskPriority TaskPriority)
FPrimitiveViewRelevance FOutlineSkeletalMeshSceneProxy::GetViewRelevance(const FSceneView* View) const
{
return Pipe.Launch(UE_SOURCE_LOCATION, [this, PrimitiveIndexQueue]
{
FOptionalTaskTagScope Scope(ETaskTag::EParallelRenderingThread);
FDynamicPrimitiveIndex PrimitiveIndex;
while (PrimitiveIndexQueue->Pop(PrimitiveIndex))
{
GatherDynamicMeshElementsForPrimitive(Primitives[PrimitiveIndex.Index], PrimitiveIndex.ViewMask);
}
#if WITH_EDITOR
while (PrimitiveIndexQueue->PopEditor(PrimitiveIndex))
{
GatherDynamicMeshElementsForEditorPrimitive(Primitives[PrimitiveIndex.Index], PrimitiveIndex.ViewMask);
}
#endif
}, TaskPriority);
}
void FDynamicMeshElementContext::GatherDynamicMeshElementsForPrimitive(FPrimitiveSceneInfo* Primitive, uint8 ViewMask)
{
SCOPED_NAMED_EVENT(DynamicPrimitive, FColor::Magenta);
TArray<int32, TInlineAllocator<4>> MeshBatchCountBefore;
MeshBatchCountBefore.SetNumUninitialized(Views.Num());
for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
{
MeshBatchCountBefore[ViewIndex] = MeshCollector.GetMeshBatchCount(ViewIndex);
}
MeshCollector.SetPrimitive(Primitive->Proxy, Primitive->DefaultDynamicHitProxyId);
// If Custom Render Passes aren't in use, there will be only one group, which is the common case.
if (ViewFamilyGroups.Num() == 1 || Primitive->Proxy->SinglePassGDME())
{
Primitive->Proxy->GetDynamicMeshElements(FirstViewFamily.AllViews, FirstViewFamily, ViewMask, MeshCollector);
}
else
{
for (FViewFamilyGroup& Group : ViewFamilyGroups)
{
if (uint8 MaskedViewMask = ViewMask & Group.ViewSubsetMask)
{
Primitive->Proxy->GetDynamicMeshElements(FirstViewFamily.AllViews, *Group.Family, MaskedViewMask, MeshCollector);
}
}
}
for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
{
FViewInfo& View = *Views[ViewIndex];
if (ViewMask & (1 << ViewIndex))
{
FDynamicPrimitive& DynamicPrimitive = DynamicPrimitives.Emplace_GetRef();
DynamicPrimitive.PrimitiveIndex = Primitive->GetIndex();
DynamicPrimitive.ViewIndex = ViewIndex;
DynamicPrimitive.StartElementIndex = MeshBatchCountBefore[ViewIndex];
DynamicPrimitive.EndElementIndex = MeshCollector.GetMeshBatchCount(ViewIndex);
}
}
FPrimitiveViewRelevance Result = FSkeletalMeshSceneProxy::GetViewRelevance(View);
Result.bDynamicRelevance = true;
return Result;
}
```
# SendRenderDynamicData_Concurrent
## FDebugSkelMeshSceneProxy::GetDynamicMeshElements
# 其他？
MeshBuilderSurface.GetMesh(GetLocalToWorld(), MatProxySurface, SDPG_Foreground, false, false, ViewIndex, Collector);