Tomas Slancik

At this point Id assume every implementation has limits, for example last time I checked Karma XPU supported only up to 2 standard surfaces being mixed and did not support building shaders from Bsdf nodes

So its always good to find out the extends of MtlX support in any particular DCC rather than automatically assuming full support

should not be detail specific are you not getting it for point, prim, vertex attribute?

every custom attribute should give you separate :indices array, which is populated by indices if you import attribute as indexed primvar otherwise is empty, but it's important it is there in case you are layering nonindexed primvar over indexed one, as then it needs to zero out the indices array

if your primitives are all separate you can do this in Point Wrangle

if any of the points is shared among multiple primitives it will get the vertex index value from first connected primitive