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/* Copyright (c) 1990 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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if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
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return; /* no specular component */ |
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/* set up function */ |
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setfunc(np->mp, np->pr); |
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setbrdfunc(np); |
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sa = np->mp->oargs.sarg; |
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errno = 0; |
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/* transform light vector */ |
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/* compute BRTDF */ |
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if (np->mp->otype == MAT_BRTDF) { |
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colval(ctmp,RED) = funvalue(sa[6], 3, ldx); |
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if (sa[7] == sa[6]) |
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if (!strcmp(sa[7],sa[6])) |
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colval(ctmp,GRN) = colval(ctmp,RED); |
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else |
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colval(ctmp,GRN) = funvalue(sa[7], 3, ldx); |
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if (sa[8] == sa[6]) |
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if (!strcmp(sa[8],sa[6])) |
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colval(ctmp,BLU) = colval(ctmp,RED); |
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else if (sa[8] == sa[7]) |
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else if (!strcmp(sa[8],sa[7])) |
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colval(ctmp,BLU) = colval(ctmp,GRN); |
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else |
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colval(ctmp,BLU) = funvalue(sa[8], 3, ldx); |
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{ |
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int minsa, minfa; |
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BRDFDAT nd; |
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double transtest, transdist; |
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COLOR ctmp; |
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double dtmp; |
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FVECT vec; |
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register int i; |
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/* check arguments */ |
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switch (m->otype) { |
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raytexture(r, m->omod); |
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nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
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multcolor(nd.mcolor, r->pcol); /* modify material color */ |
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r->rt = r->rot; /* default ray length */ |
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transtest = 0; |
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/* load auxiliary files */ |
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if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
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|| m->otype == MAT_TDATA) { |
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loadfunc(m->oargs.sarg[1]); |
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} |
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/* set special variables */ |
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setfunc(m, r); |
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multv3(vec, nd.pnorm, funcxf.xfm); |
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varset("NxP", '=', vec[0]/funcxf.sca); |
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varset("NyP", '=', vec[1]/funcxf.sca); |
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varset("NzP", '=', vec[2]/funcxf.sca); |
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varset("RdotP", '=', nd.pdot); |
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varset("CrP", '=', colval(nd.mcolor,RED)); |
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varset("CgP", '=', colval(nd.mcolor,GRN)); |
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varset("CbP", '=', colval(nd.mcolor,BLU)); |
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setbrdfunc(&nd); |
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/* compute transmitted ray */ |
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if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
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RAY sr; |
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errno = 0; |
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setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
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varvalue(m->oargs.sarg[1]), |
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varvalue(m->oargs.sarg[2])); |
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setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
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varvalue(m->oargs.sarg[4]), |
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varvalue(m->oargs.sarg[5])); |
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scalecolor(ctmp, nd.tspec); |
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if (errno) |
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objerror(m, WARNING, "compute error"); |
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else if ((dtmp = bright(ctmp)) > FTINY && |
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rayorigin(&sr, r, TRANS, dtmp) == 0) { |
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VCOPY(sr.rdir, r->rdir); |
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if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
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for (i = 0; i < 3; i++) /* perturb direction */ |
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sr.rdir[i] = r->rdir[i] - |
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.75*r->pert[i]; |
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normalize(sr.rdir); |
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} else { |
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VCOPY(sr.rdir, r->rdir); |
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transtest = 2; |
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} |
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rayvalue(&sr); |
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multcolor(sr.rcol, ctmp); |
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addcolor(r->rcol, sr.rcol); |
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if (dtmp > .5) |
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r->rt = r->rot + sr.rt; |
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transtest *= bright(sr.rcol); |
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transdist = r->rot + sr.rt; |
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} |
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} |
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if (r->crtype & SHADOW) /* the rest is shadow */ |
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if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
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RAY sr; |
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errno = 0; |
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setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
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varvalue(m->oargs.sarg[4]), |
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varvalue(m->oargs.sarg[5])); |
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setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
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varvalue(m->oargs.sarg[1]), |
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varvalue(m->oargs.sarg[2])); |
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scalecolor(ctmp, nd.rspec); |
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if (errno) |
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objerror(m, WARNING, "compute error"); |
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} |
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/* add direct component */ |
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direct(r, dirbrdf, &nd); |
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/* check distance */ |
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if (transtest > bright(r->rcol)) |
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r->rt = transdist; |
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} |
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setbrdfunc(np) /* set up brdf function and variables */ |
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register BRDFDAT *np; |
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{ |
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FVECT vec; |
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|
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if (setfunc(np->mp, np->pr) == 0) |
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return(0); /* it's OK, setfunc says we're done */ |
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/* else (re)assign special variables */ |
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multv3(vec, np->pnorm, funcxf.xfm); |
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varset("NxP", '=', vec[0]/funcxf.sca); |
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varset("NyP", '=', vec[1]/funcxf.sca); |
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varset("NzP", '=', vec[2]/funcxf.sca); |
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varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
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np->pdot >= 1.0 ? 1.0 : np->pdot); |
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varset("CrP", '=', colval(np->mcolor,RED)); |
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varset("CgP", '=', colval(np->mcolor,GRN)); |
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varset("CbP", '=', colval(np->mcolor,BLU)); |
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return(1); |
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} |
