UE4.27.2 自定义 PrimitiveComponent 出现的问题

news2024/12/27 15:06:24

CreatePrimitiveUniformBufferImmediate

然后是 CreatePrimitiveUniformBufferImmediate 这个函数的用法发生了改变，具体看：

在 https://github.com/TriAxis-Games/RealtimeMeshComponent/issues/144

代码上来看，就是要改成

		FBoxSphereBounds PreSkinnedLocalBounds;
		GetPreSkinnedLocalBounds(PreSkinnedLocalBounds);
		BatchElement.PrimitiveUniformBuffer = CreatePrimitiveUniformBufferImmediate(GetLocalToWorld(), GetBounds()
			, GetLocalBounds(), PreSkinnedLocalBounds, ReceivesDecals(), DrawsVelocity(), LpvBiasMultiplier);

FLocalVertexFactory 默认构造函数

然后是顶点工厂这个类没有默认构造函数了，所以需要在派生类里面显式调用顶点工厂基类的构造函数

	FTestCustomComponentVertexFactory() : FLocalVertexFactory(ERHIFeatureLevel::SM5, "FTestCustomComponentVertexFactory") { }

这个 level 我随便填的，我也不懂

GetTypeHash

然后是派生自 FPrimitiveSceneProxy 的类差一个虚函数没有实现，所以仍然是抽象类，不能实例化

差的这个是 GetTypeHash

我找了一些引用，抄了一个

	SIZE_T GetTypeHash() const override
	{
		static size_t UniquePointer;
		return reinterpret_cast<size_t>(&UniquePointer);
	}

ENQUEUE_RENDER_COMMAND

然后是 DataType 改成 FDataType

然后是 ENQUEUE_UNIQUE_RENDER_COMMAND_ONEPARAMETER 改成了 ENQUEUE_RENDER_COMMAND 于是新的命令为

			ENQUEUE_RENDER_COMMAND(InitTestCustomComponentVertexFactor)([VertexBuffer, this](FRHICommandListImmediate& RHICmdList) {
				//Initialize the vertex factory's stream componnents,
				FDataType NewData;
				NewData.PositionComponent = STRUCTMEMBER_VERTEXSTREAMCOMPONENT(
					VertexBuffer, FDynamicMeshVertex, Position, VET_Float3);
				NewData.TextureCoordinates.Add(FVertexStreamComponent(VertexBuffer, STRUCT_OFFSET(FDynamicMeshVertex, TextureCoordinate), sizeof(FDynamicMeshVertex), VET_Float2));
				NewData.TangentBasisComponents[0] = STRUCTMEMBER_VERTEXSTREAMCOMPONENT(VertexBuffer,
					FDynamicMeshVertex, TangentX, VET_PackedNormal);
				NewData.TangentBasisComponents[1] = STRUCTMEMBER_VERTEXSTREAMCOMPONENT(VertexBuffer,
					FDynamicMeshVertex, TangentZ, VET_PackedNormal);
				SetData(NewData);
			});