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/* Copyright (c) 1986 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* o_face.c - routines for creating octrees for polygonal faces. |
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* |
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* 5) If test 4 fails, we have no intersection. |
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*/ |
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o_face(o, cu) /* determine if face intersects cube */ |
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OBJREC *o; |
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CUBE *cu; |
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/* XXX this is extern, but not declared in any header file yet */ |
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int |
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o_face( /* determine if face intersects cube */ |
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OBJREC *o, |
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CUBE *cu |
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) |
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{ |
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FVECT cumin, cumax; |
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FVECT v1, v2; |
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vloc = ABOVE | BELOW; /* check vertices */ |
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for (i = 0; i < f->nv; i++) |
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if (j = plocate(VERTEX(f,i), cumin, cumax)) |
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if ( (j = plocate(VERTEX(f,i), cumin, cumax)) ) |
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vloc &= j; |
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else |
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return(O_HIT); /* vertex inside */ |
