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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1995 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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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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mirtest = transtest = 0; |
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mirdist = transdist = r->rot; |
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/* get specular component */ |
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if ((nd.rspec = m->oargs.farg[3]) > FTINY) { |
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nd.specfl |= SP_REFL; |
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/* compute specular color */ |
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if (m->otype == MAT_METAL) |
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copycolor(nd.scolor, nd.mcolor); |
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else |
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setcolor(nd.scolor, 1.0, 1.0, 1.0); |
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scalecolor(nd.scolor, nd.rspec); |
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/* check threshold */ |
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if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
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nd.specfl |= SP_RBLT; |
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/* compute reflected ray */ |
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for (i = 0; i < 3; i++) |
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nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
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/* penetration? */ |
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if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
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for (i = 0; i < 3; i++) /* safety measure */ |
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nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
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RAY lr; |
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if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
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VCOPY(lr.rdir, nd.vrefl); |
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rayvalue(&lr); |
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multcolor(lr.rcol, nd.scolor); |
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addcolor(r->rcol, lr.rcol); |
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if (!hastexture && nd.specfl & SP_FLAT) { |
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mirtest = 2.*bright(lr.rcol); |
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mirdist = r->rot + lr.rt; |
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} |
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} |
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} |
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} |
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nd.rspec = m->oargs.farg[3]; |
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/* compute transmission */ |
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if (m->otype == MAT_TRANS) { |
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nd.trans = m->oargs.farg[5]*(1.0 - nd.rspec); |
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if (r->crtype & SHADOW) { /* the rest is shadow */ |
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r->rt = transdist; |
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return(1); |
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} |
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/* get specular reflection */ |
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if (nd.rspec > FTINY) { |
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nd.specfl |= SP_REFL; |
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/* compute specular color */ |
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if (m->otype == MAT_METAL) |
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copycolor(nd.scolor, nd.mcolor); |
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else |
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setcolor(nd.scolor, 1.0, 1.0, 1.0); |
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scalecolor(nd.scolor, nd.rspec); |
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/* check threshold */ |
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if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
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nd.specfl |= SP_RBLT; |
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/* compute reflected ray */ |
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for (i = 0; i < 3; i++) |
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nd.vrefl[i] = r->rdir[i] + 2.*nd.pdot*nd.pnorm[i]; |
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/* penetration? */ |
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if (hastexture && DOT(nd.vrefl, r->ron) <= FTINY) |
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for (i = 0; i < 3; i++) /* safety measure */ |
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nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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|
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if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
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RAY lr; |
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if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
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VCOPY(lr.rdir, nd.vrefl); |
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rayvalue(&lr); |
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multcolor(lr.rcol, nd.scolor); |
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addcolor(r->rcol, lr.rcol); |
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if (!hastexture && nd.specfl & SP_FLAT) { |
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mirtest = 2.*bright(lr.rcol); |
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mirdist = r->rot + lr.rt; |
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} |
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} |
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} |
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} |
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/* diffuse reflection */ |
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nd.rdiff = 1.0 - nd.trans - nd.rspec; |