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/* Copyright (c) 1991 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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{ |
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COLOR mcolor; |
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RAY nr; |
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int rpure = 1; |
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register int i; |
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/* check arguments */ |
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if (m->oargs.nfargs != 3 || m->oargs.nsargs > 1) |
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objerror(m, USER, "bad number of arguments"); |
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/* check if source ray */ |
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if (r->rsrc >= 0) { /* aiming for somebody */ |
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if (source[r->rsrc].so != r->ro) |
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return; /* but not us */ |
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} else if (m->oargs.nsargs > 0) { /* else call substitute? */ |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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/* check for substitute material */ |
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if (m->oargs.nsargs > 0 && |
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(r->rsrc < 0 || source[r->rsrc].so != r->ro)) { |
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if (!strcmp(m->oargs.sarg[0], VOIDID)) { |
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raytrans(r); |
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return(1); |
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} |
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return(rayshade(r, modifier(m->oargs.sarg[0]))); |
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} |
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/* check for bad source ray */ |
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if (r->rsrc >= 0 && source[r->rsrc].so != r->ro) |
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return(1); |
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|
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if (r->rod < 0.) /* back is black */ |
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return; |
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return(1); |
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/* get modifiers */ |
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raytexture(r, m->omod); |
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/* assign material color */ |
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double pdot; |
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if (rayorigin(&nr, r, REFLECTED, bright(mcolor)) < 0) |
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return; |
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pdot = raynormal(pnorm, r); /* use textures */ |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*pdot*pnorm[i]; |
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return(1); |
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if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
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pdot = raynormal(pnorm, r); /* use textures */ |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*pdot*pnorm[i]; |
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rpure = 0; |
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} |
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/* check for penetration */ |
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if (rpure || DOT(nr.rdir, r->ron) <= FTINY) |
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for (i = 0; i < 3; i++) |
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nr.rdir[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
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} |
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rayvalue(&nr); |
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multcolor(nr.rcol, mcolor); |
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addcolor(r->rcol, nr.rcol); |
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if (rpure && r->ro != NULL && isflat(r->ro->otype)) |
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r->rt = r->rot + nr.rt; |
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return(1); |
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} |
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SRCREC *s; |
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int n; |
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{ |
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FVECT nv; |
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FVECT nv, sc; |
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double od; |
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register int i, j; |
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/* get surface normal and offset */ |
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od = getplaneq(nv, o); |
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/* check for behind */ |
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if (DOT(s->sloc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY)) |
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/* check for extreme point for behind */ |
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VCOPY(sc, s->sloc); |
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for (i = s->sflags & SFLAT ? SV : SW; i >= 0; i--) |
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if (DOT(nv, s->ss[i]) > 0.) |
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for (j = 0; j < 3; j++) |
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sc[j] += s->ss[i][j]; |
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else |
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for (j = 0; j < 3; j++) |
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sc[j] -= s->ss[i][j]; |
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if (DOT(sc, nv) <= (s->sflags & SDISTANT ? FTINY : od+FTINY)) |
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return(0); |
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/* everything OK -- compute projection */ |
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mirrorproj(pm, nv, od); |
