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A vertex is not just a spatial position, but a whole bag of attributes. A position p is a point in some spatial space or a homogeneous coordinate. A texcoord tc is a point in texture space. A normal n is a bivector, and so on. If you represented a vertex with multiple indices, a vertex V_k could be represented by a tuple of indices {p_a, tc_b, n_c}. In a ...

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