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/* Copyright (c) 1990 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_cone.c - routine to determine ray intersection with cones. |
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* |
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* 2/13/86 |
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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 "otypes.h" |
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#include "rtotypes.h" |
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#include "cone.h" |
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o_cone(o, r) /* intersect ray with cone */ |
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OBJREC *o; |
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register RAY *r; |
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extern int |
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o_cone( /* intersect ray with cone */ |
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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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FVECT rox, rdx; |
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double a, b, c; |
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for (i = 0; i < 3; i++) |
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r->ron[i] = (co->al*r->ron[i] - c*co->ad[i]) |
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/co->sl; |
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a = DOT(r->ron, r->ron); |
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if (a > 1.+FTINY || a < 1.-FTINY) { |
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c = 1./(.5 + .5*a); /* avoid numerical error */ |
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r->ron[0] *= c; r->ron[1] *= c; r->ron[2] *= c; |
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} |
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r->rod = -DOT(r->rdir, r->ron); |
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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); /* good */ |
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} |
