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/* Copyright (c) 1991 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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* glass.c - simpler shading function for thin glass surfaces. |
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* |
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* 11/14/86 |
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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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/* |
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* This definition of glass provides for a quick calculation |
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#define RINDEX 1.52 /* refractive index of glass */ |
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m_glass(m, r) /* color a ray which hit a thin glass surface */ |
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OBJREC *m; |
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register RAY *r; |
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extern int |
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m_glass( /* color a ray which hit a thin glass surface */ |
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OBJREC *m, |
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register RAY *r |
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) |
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{ |
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COLOR mcolor; |
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double pdot; |
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setcolor(mcolor, m->oargs.farg[0], m->oargs.farg[1], m->oargs.farg[2]); |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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if (r->rod < 0.0) /* reorient if necessary */ |
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flipsurface(r); |
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mirtest = transtest = 0; |
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mirdist = transdist = r->rot; |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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if (hastexture = DOT(r->pert,r->pert) > FTINY*FTINY) |
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/* perturb normal */ |
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if ( (hastexture = (DOT(r->pert,r->pert) > FTINY*FTINY)) ) { |
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pdot = raynormal(pnorm, r); |
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else { |
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} else { |
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VCOPY(pnorm, r->ron); |
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pdot = r->rod; |
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} |
