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wish: multi-primitive loading for GLTF #48

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@xqms

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@xqms

First of all, nice work on the engine! I'm trying to use magnum for generating renderings in a deep learning pipeline.

I currently get this one a lot and end up with parts of my meshes missing:

Trade::TinyGltfImporter::mesh3D(): more than one primitive per mesh is not supported at the moment, only the first will be imported

How involved would it be to implement this properly? I'm new both to magnum and GLTF, so I'm not sure I understand all the implications (Does magnum support multiple primitive types for one mesh? ...).

If you give me some roadmap of what needs to be done, I could probably work on this :-)

Here is an example mesh file: https://uni-bonn.sciebo.de/s/psUuQOVBmxAfwXU

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