Does several materials in one cluster supported?

[KickRooster]

Hi there,

I'm using meshoptimizer helping me to support Nanite like continuous LOD rendering. As far as I know, meshoptimizer doesn't support more than one material existing in one cluster after function
void nanite(const std::vector<Vertex>& vertices, const std::vector<unsigned int>& indices)
be called now, is it?

Thanks.

[zeux]

clusterlod.h does not have explicit multi-material support. https://meshoptimizer.org/#advanced-simplification covers some ways to resolve this which probably would work here too: splitting the mesh along the material boundary could work (but will have some challenges along the boundary in the simplified result...); pre-processing the input mesh so that vertices have material ids would allow to run the entire cluster LOD generation pipeline and then extract the resulting material from the vertices referenced by the triangles.

[KickRooster]

Yep, thank you for sharing the idea of splitting the mesh by material id as a vertex attribute. I'll try it and hope it works well for group hierarchy generation.

[KickRooster]

Does a merge request to the repository be welcomed to achieve this feature? I'm developing it cover both clusterlod.h and 3 files in the src folder.

[zeux]

Explicit multi material support is not currently planned; if there’s a way to implement it without changing the core library (only changing clusterlod.h) then it could be considered for inclusion, but I am not currently interested in integrating into the src/ folder.

[KickRooster]

Oh, I got it, and I will try to make my implementation works with clusterlod.h be modified only.