It all amounts to the same thing :).  If I understand your question, In the actual code, we don't go 3-deep (to start with), because we just grab v0, v1, v2 (3 vertices of a triangle), but to multiply (or otherwise deal with) the X/Y/Z elements of those, we're effectively going 3-deep, because we later de-reference v0[0], v0[1], v0[2] as well as v1[0]], v1[1], v1[2] and the same for the third vertex.

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