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sub-index buffers and color calculations

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Hello I need some consultation whit what I’m going to do. I’m keeping the whole world in a large mesh. I want to divide this mesh into several index buffers. I want to compute the bounding box and the unshaded average color over the index buffers. Now to my questions: • Is there a possibility to attach id to parts of the mesh through the x-file (I create the model whit 3dsmax)? The only way I came up whit, was to do it by name conversion of the meshes materials, maybe there is better ways. • How do divide the mesh into sub-index buffers? • How do I get the average color over the surface made up by the index buffer?

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