| http://www.w3.org/ns/prov#value | - a face and Q is a vertex. . . a q - ((p-q)???n)n. . . b q. . . go to CLIP.. . if P is a face and Q is an edge. . . t (n ??? (q0 -p))/(n ??? (q1-q0)). . . if 0 < t < 1. . . . a p0 + t (p1 -p0). . . . b a. . . . r a. . . . F P. . . . go to CLIP. . . else. . . . go to REJECT. ..
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