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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 "ray.h" |
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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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#include "rtotypes.h" |
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o_face(o, r) /* compute intersection with polygonal face */ |
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OBJREC *o; |
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register RAY *r; |
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extern int |
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o_face( /* compute intersection with polygonal face */ |
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OBJREC *o, |
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register RAY *r |
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) |
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{ |
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double rdot; /* direction . normal */ |
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double t; /* distance to intersection */ |
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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->rofs = 1.0; setident4(r->rofx); |
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r->robs = 1.0; setident4(r->robx); |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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r->rox = NULL; |
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return(1); /* hit */ |
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} |
