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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 - compute ray intersection with faces. |
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* |
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* 8/29/85 |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "face.h" |
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if (rdot <= FTINY && rdot >= -FTINY) /* ray parallels plane */ |
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t = FHUGE; |
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else |
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t = (DOT(r->rorg, f->norm) - f->const) / rdot; |
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t = (DOT(r->rorg, f->norm) - f->offset) / rdot; |
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if (t <= FTINY || t >= r->rot) /* not good enough */ |
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return(0); |
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for (i = 0; i < 3; i++) |
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pisect[i] = r->rorg[i] + r->rdir[i]*t; |
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if (inface(pisect, f)) { /* ray intersects face? */ |
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if (!inface(pisect, f)) /* ray intersects face? */ |
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return(0); |
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r->ro = o; |
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r->rot = t; |
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VCOPY(r->rop, pisect); |
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VCOPY(r->ron, f->norm); |
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r->rod = rdot; |
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} |
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r->ro = o; |
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r->rot = t; |
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VCOPY(r->rop, pisect); |
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VCOPY(r->ron, f->norm); |
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r->rod = rdot; |
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r->rox = NULL; |
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return(1); /* hit */ |
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} |
