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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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* modifier glass id |
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* 0 |
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* 0 |
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* 3 red grn blu |
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* 3+ red grn blu [refractive_index] |
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* |
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* The color is used for the transmission at normal incidence. |
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* To compute transmissivity (tn) from transmittance (Tn) use: |
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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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} |
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colval(trans,i) = .5*(1.0-r1e)*(1.0-r1e)*d/(1.0-r1e*r1e*d*d); |
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colval(trans,i) += .5*(1.0-r1m)*(1.0-r1m)*d/(1.0-r1m*r1m*d*d); |
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} |
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multcolor(trans, r->pcol); /* modify by pattern */ |
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/* transmitted ray */ |
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if (rayorigin(&p, r, TRANS, bright(trans)) == 0) { |
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if (rayorigin(&p, TRANS, r, trans) == 0) { |
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if (!(r->crtype & SHADOW) && hastexture) { |
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for (i = 0; i < 3; i++) /* perturb direction */ |
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p.rdir[i] = r->rdir[i] + |
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transtest = 2; |
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} |
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rayvalue(&p); |
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multcolor(p.rcol, r->pcol); /* modify */ |
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multcolor(p.rcol, trans); |
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multcolor(p.rcol, p.rcoef); |
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addcolor(r->rcol, p.rcol); |
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transtest *= bright(p.rcol); |
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transdist = r->rot + p.rt; |
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colval(refl,i) += .5*r1m*(1.0+(1.0-2.0*r1m)*d)/(1.0-r1m*r1m*d); |
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} |
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/* reflected ray */ |
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if (rayorigin(&p, r, REFLECTED, bright(refl)) == 0) { |
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if (rayorigin(&p, REFLECTED, r, refl) == 0) { |
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for (i = 0; i < 3; i++) |
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p.rdir[i] = r->rdir[i] + 2.0*pdot*pnorm[i]; |
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rayvalue(&p); |
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multcolor(p.rcol, refl); |
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multcolor(p.rcol, p.rcoef); |
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addcolor(r->rcol, p.rcol); |
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if (!hastexture && r->ro != NULL && isflat(r->ro->otype)) { |
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mirtest = 2.0*bright(p.rcol); |
