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If I select one object, say a slab, render it from ArchiCAD to Maxwell, open the MXS in Studio, I see a bunch of materials (like 30) that are not in the ArchiCAD 3d view of the slab. I would expect that I would only get materials linked to the slab object I am viewing. Is this something that can be corrected? I often have to manually delete unused textures. I don't understand why they need to export when not used in the scene.

I will look into this - the material should be cleaned up after the export (only the used materials should be kept in MXS file) but there might be a bug there.

All textures of the project are exported at the moment - this is the way the ArchiCAD rendering SDK presents them but the truth is that it can be optimized. I am putting this on my ToDo list.