vault backup: 2025-06-27 11:02:45

03-UnrealEngine/Rendering/RenderFeature/ShaderWorldPlugin/ShaderWorld.md

@@ -311,12 +311,16 @@ bool AShaderWorldActor::SetupCollisions()
 ```
 
 #### CollisionFinalizeWork()
+结束碰撞生成任务，true为完成，false为任务超时未完成。
+- TMap<FName,FCollisionMeshElement> CollisionMesh：碰撞Name => 碰撞Mesh Map。
+	- FCollisionMeshElement：管理单个碰撞数据的结构体。
+
 ```c++
 bool AShaderWorldActor::CollisionFinalizeWork()
 {
 	SCOPED_NAMED_EVENT_TEXT("AShaderWorldActor::CollisionFinalizeWork()", FColor::Magenta);
 	SW_FCT_CYCLE()
-
+	
 	if (!CollisionReadToProcess.IsEmpty())
 		return true;
 
@@ -324,6 +328,7 @@ bool AShaderWorldActor::CollisionFinalizeWork()
 
 	double TimeStart = FPlatformTime::Seconds();
 
+	//判断处理队列是否为空
 	if(CollisionWorkQueue.Num()<=0)
 		return true;
 
@@ -331,24 +336,117 @@ bool AShaderWorldActor::CollisionFinalizeWork()
 		FScopeLock CollisionMeshArrayAccess(&CollisionMeshAccessLock);
 		for (int i = CollisionWorkQueue.Num() - 1; i >= 0; i--)
 		{
+			//判断生成时间是否是否超过预设数值，如果超过就直接返回。默认为1 ms。
 			if ((FPlatformTime::Seconds() - TimeStart) * 1000.0 > GameThreadBudget_ms)
 				return false;
 
+			//将生成的碰撞数据赋予给对应的碰撞Mesh，最后移除任务队列中的任务。
 			FCollisionProcessingWork& Work = CollisionWorkQueue[i];
-
 			ensure(CollisionMesh.Find(Work.MeshID));
-
 			FCollisionMeshElement& Mesh = CollisionMesh[Work.MeshID];
-
 			Mesh.Mesh->UpdateSectionTriMesh(Work.DestB);
-
 			CollisionWorkQueue.RemoveAt(i);
 		}
 	}
 
 	CollisionWorkQueue.Empty();
 	return true;
+}
 
+void UShaderWorldCollisionComponent::UpdateSectionTriMesh(TSharedPtr<FSWShareableVerticePositionBuffer, ESPMode::ThreadSafe>& Positions)
+{	
+	//UBodySetup
+	if (AsyncBodySetupQueue.Num() > 0)
+	{
+#if SWDEBUG
+		SW_LOG("Collision Update received during alreayd occuring computation %s",*GetName())
+#endif
+
+		UpdatesReceivedDuringCompute.Add(Positions);
+
+		return;
+	}
+	
+	UpdatesReceivedDuringCompute.Empty();
+	
+
+	bool EnsureSameBuffers = ProcMeshSections.Num() > 0 && ProcMeshSections[0].PositionBuffer.IsValid() && (ProcMeshSections[0].PositionBuffer->Positions3f.Num() == 0 || ProcMeshSections[0].PositionBuffer->Positions3f.Num() == Positions->Positions.Num());
+	if(!EnsureSameBuffers)
+	{
+#if SWDEBUG
+		UE_LOG(LogTemp,Warning,TEXT("Error UpdateSectionTriMesh : buffers incompatible"));
+#endif
+
+	}
+	else
+	{
+		ProcMeshSections[0].PositionBuffer.Reset();
+		ProcMeshSections[0].Normals.Reset();
+
+		ProcMeshSections[0].PositionBuffer = Positions;
+		ProcMeshSections[0].SectionLocalBox = Positions->Bound;
+		ProcMeshSections[0].bEnableCollision = true;
+
+		Async(EAsyncExecution::TaskGraph, [WeakThis = MakeWeakObjectPtr(this), PBuffer = Positions, IndexB = ProcMeshSections[0].IndexBuffer]
+		{
+				TSharedPtr<TArray<FVector>, ESPMode::ThreadSafe> Normals = SWComputeNormalsForPatch(PBuffer, IndexB);
+
+				AsyncTask(ENamedThreads::GameThread, [WeakThis,PBuffer, Normals]()
+				{
+						if (WeakThis.IsValid())
+						{
+							if (UShaderWorldCollisionComponent* Comp = Cast<UShaderWorldCollisionComponent>(WeakThis.Get()))
+							{
+								if(IsValid(Comp))
+									Comp->ReceiveComputedNormals(PBuffer, Normals);
+							}
+						}
+				});
+		});
+	}
+	
+	//Materials
+	// Pass new positions to trimesh
+	UpdateCollision();
+	UpdateLocalBounds();		 // Update overall bounds
+	UpdateNavigation();
+
+	if (ProcMeshSections.Num() > 0 && (ProcMeshSections[0].bSectionVisible || (GetWorld() && !GetWorld()->IsGameWorld())))
+	{
+		// If we have a valid proxy and it is not pending recreation
+		if (SceneProxy && !IsRenderStateDirty())
+		{
+			//SW_LOG("Update trimesh SceneProxy && !IsRenderStateDirty()")
+			// Create data to update section
+			FShaderWColProcMeshSectionUpdateData* SectionData = new FShaderWColProcMeshSectionUpdateData;
+			SectionData->TargetSection = 0;
+			SectionData->NewPositionBuffer = ProcMeshSections[0].PositionBuffer;
+
+			if(AShaderWorldActor* owner = Cast<AShaderWorldActor>(GetOwner()))
+			{
+				{
+					// Enqueue command to send to render thread
+					FShaderWProceduralMeshSceneProxy* ProcMeshSceneProxy = (FShaderWProceduralMeshSceneProxy*)(SceneProxy && !IsRenderStateDirty() ? SceneProxy : nullptr);
+					ENQUEUE_RENDER_COMMAND(FGeoCProcMeshSectionUpdate)
+						([ProcMeshSceneProxy, SectionData](FRHICommandListImmediate& RHICmdList)
+						{
+							if(ProcMeshSceneProxy)
+								ProcMeshSceneProxy->UpdateSection_RenderThread(SectionData);
+						});
+				}				
+			}
+			else
+			{
+				//SW_LOG("Update trimesh !owner")
+			}
+		}
+		else
+		{
+			//SW_LOG("Update trimesh !(SceneProxy && !IsRenderStateDirty())")
+		}
+
+		MarkRenderTransformDirty();
+	}
 }
 ```
 ### SpawnablesManagement()