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leeminardi
en respuesta a: autoid374ceb4990

Point P is initially at #1 on the surface of the 3DFACE. Where its path leaves the face is point Q.  Point Q becomes point P for the adjacent face and a new Q is calculated.  The process continues until there's nowhere lower to go from the last point P.  As noted, the adjacet faces for when P is at #2 slope upwards, the path from there follow the edge (crevice) to the corner at #3.

lee.minardi