Add a point to a Bsp node before a specified vertex (between it and the previous one). VertexNumber can be from 0 (before first) to Node->NumVertices (after last). Splits node into two coplanar polys if necessary. If the polygon is split, the vertices will be distributed among this node and it's newly-linked iPlane node in an arbitrary way, that preserves the clockwise orientation of the vertices
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