ayoubkhammassi / custommeshcomponent Goto Github PK

Hello，Do you have any plans to update the UE5 version？
This is my code, but crash. Engine version 5.2.1
Code

LogClass: Warning: ObjectProperty FDeformMeshSection::StaticMesh is not initialized properly. Module:DeformMesh File:Classes/Components/DeformMeshComponent.h
LogClass: Warning: FDeformMeshSection::DeformTransform is not initialized properly. Module:DeformMesh File:Classes/Components/DeformMeshComponent.h
LogClass: Display: 2 Uninitialized script struct members found
LogAutomationTest: Warning: ObjectProperty FDeformMeshSection::StaticMesh is not initialized properly. Module:DeformMesh File:Classes/Components/DeformMeshComponent.h
LogAutomationTest: Warning: FDeformMeshSection::DeformTransform is not initialized properly. Module:DeformMesh File:Classes/Components/DeformMeshComponent.h

LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: DeformMeshComponent /Game/Maps/MainMap.MainMap:PersistentLevel.DeformMeshActor_1.Deform Mesh Component)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: DeformMeshComponent /Game/Maps/MainMap.MainMap:PersistentLevel.DeformMeshActor_1.Deform Mesh Component)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: DeformMeshComponent /Game/Maps/MainMap.MainMap:PersistentLevel.DeformMeshActor_1.Deform Mesh Component)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: DeformMeshComponent /Game/Maps/MainMap.MainMap:PersistentLevel.DeformMeshActor_1.Deform Mesh Component)
LogNavigationDirtyArea: Warning: Skipping dirty area creation because of empty bounds (object: DeformMeshComponent /Game/Maps/MainMap.MainMap:PersistentLevel.DeformMeshActor_1.Deform Mesh Component)

And render nothing.

I have a question for you. I found your article because I'm in the process of trying to create a custom mesh of a sphere and apply noise to it to generate terrain. The only way to do that in UE is to access the systems you're referencing in your article. I've read through it and I kind of understand the principles you've explained, but the example you give actually still uses a pre-generated mesh. I was wondering if you have any tips on how to create a mesh from say an array of vertices that I determine myself.

The idea being that I generate a large planet with terrain.

Also great work on the article so far, I know theres one more chapter to come but so far you've given me a lot of insight on how UE abstracts away access to the rendering pipeline.

First of all, let me tell you that I highly appreciate your tutorials, I would have found it impossible to get into this topic without them.

I attempted to run your project with 4.28. After patching UpdateDeformTransformsSB_RenderThread to check that DeformTransformsSB != nullptr I got the editor working and it shows the statue just fine. I assume maybe the order in which things are initialized must have changed between versions.

Anyways, when I try to run the game itself I get the following error log:

FD3D11DynamicRHI::RHICreateVertexBuffer()
FD3D11DynamicRHI::CreateVertexBuffer_RenderThread()
FPositionVertexBuffer::CreateRHIBuffer_Internal<1>()
FPositionVertexBuffer::InitRHI()
InitOrUpdateResource() [CustomMeshComponent\Source\DeformMesh\Private\Components\DeformMeshComponent.cpp:1
<lambda_2d7339148efd183a3d3d33b3b2efb563>::operator()() [CustomMeshComponent\Source\DeformMesh\Private\Components\DeformMeshComponent.cpp:2
TEnqueueUniqueRenderCommandType<InitVertexFactoryData'::2'::StaticMeshVertexBuffersLegacyInitName,<lambda_2d7339148efd183a3d3d33b3b2efb563> >::DoTask() [Engine\Source\Runtime\RenderCore\Public\RenderingThread.h:1
TGraphTask<TEnqueueUniqueRenderCommandType<InitVertexFactoryData'::2'::StaticMeshVertexBuffersLegacyInitName,<lambda_2d7339148efd183a3d3d33b3b2efb563> > >::ExecuteTask() [Engine\Source\Runtime\Core\Public\Async\TaskGraphInterfaces.h:8
FNamedTaskThread::ProcessTasksNamedThread()
FNamedTaskThread::ProcessTasksUntilQuit()
RenderingThreadMain()
FRenderingThread::Run()
FRunnableThreadWin::Run()
FRunnableThreadWin::GuardedRun()

From what I can gather, during the initialization of the PositionVertexBuffer in StaticMeshVertexBuffersLegacyInit
a check(Size > 0) fails in FD3D11DynamicRHI::RHICreateVertexBuffer() on line24 D3D11VertexBuffer.cpp:

if (CreateInfo.bWithoutNativeResource)
{
return new FD3D11VertexBuffer();
}

// Explicitly check that the size is nonzero before allowing CreateVertexBuffer to opaquely fail.
check(Size > 0);

Unfortunately I cant seem to debug the launched game (only the editor), so I'm left to look at the code. I see from
FVertexBufferRHIRef FPositionVertexBuffer::CreateRHIBuffer_Internal() in PositionVertexBuffer.cpp

FResourceArrayInterface* RESTRICT ResourceArray = VertexData ? VertexData->GetResourceArray() : nullptr;
const uint32 SizeInBytes = ResourceArray ? ResourceArray->GetResourceDataSize() : 0;
FRHIResourceCreateInfo CreateInfo(ResourceArray);
CreateInfo.bWithoutNativeResource = !VertexData;
if (bRenderThread)
{
	return RHICreateVertexBuffer(SizeInBytes, BUF_Static | BUF_ShaderResource, CreateInfo);
}

I know from PositionVertexBuffer.cpp that bWithoutNativeResource is false, i.e. VertexData is not nullptr so either the VertexData resource is not initialized or its size is 0.

Again, I suppose the order in which things are initialized must have changed and without being able to debug I feel very much stuck. Any chance you could give me a hint on how to approach this?

Best regards,
Oskar