Setting material on UDynamicMeshComponent

Development Programming & Scripting
1

I’ve decided to try out UDynamicMeshComponent as an alternative to UProceduralMeshComponent which I got working. I’ve created a FDynamicMesh3 and called SetMesh(std::move(*dynamicMesh)) and SetMaterial(0, materialInstance) on UDynamicMeshComponent. The mesh appears but the material doesn’t. I’ve also tried ConfigureMaterialSet(). Has anybody successfully got materials working with UDynamicMeshComponent?

2

Have you took a look at ADynamicMeshActor?
It’s constructor sets up Material for UDynamicMeshComponent in the following way:

DynamicMeshComponent->SetMaterial(0, UMaterial::GetDefaultMaterial(MD_Surface));

See: Engine/Source/Runtime/GeometryFramework/Private/DynamicMeshActor.cpp#L13-L26

There is no more Material manipulation code in said Actor so I suspect that you have to manipulate it at runtime on your own.

3

Thanks, I’ll check out the source code of ADynamicMeshActor to see if there are more hints on how to use the component.

4

The material was been applied but not the UVs so the textures weren’t showing up.

auto mesh = new FDynamicMesh3(true, false, true, false); // check the constructor what attributes you want to enable: https://docs.unrealengine.com/4.27/en-US/API/Plugins/DynamicMesh/FDynamicMesh3/__ctor/6/

mesh->EnableAttributes();

// Add positions, uvs, normals, triangles

UE::Geometry::CopyVertexUVsToOverlay(*mesh, *(mesh->Attributes()->PrimaryUV()));
UE::Geometry::CopyVertexNormalsToOverlay(*mesh, *(mesh->Attributes()->PrimaryNormals()));
5

So all good now? Problem solved or is still something not working as expected? Not sure if I understand right.