| An array of indices representing the vertices of the polygons to build. Each positive integer in this array is a reference to the index of an element in the Vertex Position Array. You should specify
the indices of each polygon in counter-clockwise order when the normal is facing you. Any negative value means "End of the
polygon".
For example to describe one triangle and one quad it could be like this: "0, 1, 2, -2, 1, 3, 4, 2, -2" where "0, 1, 2" is
a triangle and "1, 3, 4, 2" is a quad.
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