HI Werner, I can't think of think of reason that would cause a problem. It's quite a while since I look at the associated code so it might be simply that I've forgotten constraints. Have a look at the osg::Geometry::drawImplementation() to see if there is a constraint on vertex attributes needing to be BIND_PER_VERTEX.
If you were using the VSG that I'd suggest running with Vulkan debug and API layer as it's great for picking up errors. Are there any OpenGL errors being produced? Robert.
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