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/* Copyright (c) 1986 Regents of the University of California */ |
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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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double cos2; |
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COLOR trans, refl; |
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double d, r1; |
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double transtest, transdist; |
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RAY p; |
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register int i; |
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if (r->rod < 0.0) /* reorient if necessary */ |
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flipsurface(r); |
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transtest = 0; |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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pdot = raynormal(pnorm, r); |
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} |
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/* transmitted ray */ |
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if (rayorigin(&p, r, TRANS, bright(trans)) == 0) { |
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VCOPY(p.rdir, r->rdir); |
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if (!(r->crtype & SHADOW) && |
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DOT(r->pert,r->pert) > FTINY*FTINY) { |
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for (i = 0; i < 3; i++) /* perturb direction */ |
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p.rdir[i] = r->rdir[i] - r->pert[i]/RINDEX; |
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normalize(p.rdir); |
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} else { |
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VCOPY(p.rdir, r->rdir); |
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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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addcolor(r->rcol, p.rcol); |
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r->rt = r->rot + p.rt; |
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transtest *= bright(p.rcol); |
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transdist = r->rot + p.rt; |
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} |
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if (r->crtype & SHADOW) /* skip reflected ray */ |
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rayvalue(&p); |
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multcolor(p.rcol, refl); |
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addcolor(r->rcol, p.rcol); |
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if (bright(refl) > bright(trans)) |
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r->rt = r->rot + p.rt; |
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} |
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if (transtest > bright(r->rcol)) |
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r->rt = transdist; |
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} |
