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/* Copyright (c) 1991 Regents of the University of California */ |
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/* Copyright (c) 1992 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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marksources() /* find and mark source objects */ |
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{ |
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int foundsource = 0; |
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int i; |
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register OBJREC *o, *m; |
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register int ns; |
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source[ns].sflags |= SSKIP; |
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} |
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} |
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if (!(source[ns].sflags & SSKIP)) |
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foundsource++; |
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} |
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if (nsources <= 0) { |
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if (!foundsource) { |
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error(WARNING, "no light sources found"); |
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return; |
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} |
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markvirtuals(); /* find and add virtual sources */ |
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/* allocate our contribution arrays */ |
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maxcntr = nsources + MAXSPART*2; /* start with this many */ |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
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if (srccnt == NULL || cntord == NULL) |
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if (srccnt == NULL | cntord == NULL) |
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goto memerr; |
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return; |
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memerr: |
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SRCINDEX *si; /* source sample index */ |
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{ |
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double d; /* distance to source */ |
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FVECT vd; |
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register SRCREC *srcp; |
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register int i; |
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rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
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sr->rsrc = si->sn; /* remember source */ |
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srcp = source + si->sn; |
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if (srcp->sflags & SDISTANT) { |
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if (srcp->sflags & SSPOT) { /* check location */ |
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for (i = 0; i < 3; i++) |
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vd[i] = srcp->sl.s->aim[i] - sr->rorg[i]; |
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d = DOT(sr->rdir,vd); |
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if (d <= FTINY) |
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continue; |
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d = DOT(vd,vd) - d*d; |
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if (PI*d > srcp->sl.s->siz) |
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continue; |
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} |
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if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
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continue; |
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return(1); /* sample OK */ |
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} |
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/* local source */ |
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continue; |
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/* check angle */ |
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if (srcp->sflags & SSPOT) { |
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if (srcp->sl.s->siz < 2.0*PI * |
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(1.0 + DOT(srcp->sl.s->aim,sr->rdir))) |
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if (spotout(sr, srcp->sl.s, 0)) |
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continue; |
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/* adjust solid angle */ |
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si->dom *= d*d; |
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} |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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{ |
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int first, last; |
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register int i; |
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|
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if (r->rsrc >= 0) { /* check only one if aimed */ |
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first = last = r->rsrc; |
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} else { /* otherwise check all */ |
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first = 0; last = nsources-1; |
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} |
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for (i = first; i <= last; i++) |
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if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
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/* |
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* Check to see if ray is within |
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* solid angle of source. |
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*/ |
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if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
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<= source[i].ss2) { |
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r->ro = source[i].so; |
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if (!(source[i].sflags & SSKIP)) |
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break; |
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} |
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|
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if (r->ro != NULL) { |
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for (i = 0; i < 3; i++) |
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r->ron[i] = -r->rdir[i]; |
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r->rod = 1.0; |
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r->rox = NULL; |
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return(1); |
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} |
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return(0); |
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} |
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|
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|
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static int |
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
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register CNTPTR *sc1, *sc2; |
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maxcntr*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)realloc((char *)cntord, |
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maxcntr*sizeof(CNTPTR)); |
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if (srccnt == NULL || cntord == NULL) |
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if (srccnt == NULL | cntord == NULL) |
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error(SYSTEM, "out of memory in direct"); |
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} |
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cntord[sn].sndx = sn; |
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l = m; |
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} |
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} |
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if (ncnts == 0) |
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return; /* no contributions! */ |
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/* accumulate tail */ |
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for (sn = ncnts-1; sn > 0; sn--) |
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cntord[sn-1].brt += cntord[sn].brt; |
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scalecolor(srccnt[cntord[sn].sndx].val, prob); |
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addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
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} |
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} |
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|
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|
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/**************************************************************** |
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* The following macros were separated from the m_light() routine |
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* because they are very nasty and difficult to understand. |
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*/ |
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|
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/* wrongillum * |
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* |
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* We cannot allow an illum to pass to another illum, because that |
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* would almost certainly constitute overcounting. |
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* However, we do allow an illum to pass to another illum |
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* that is actually going to relay to a virtual light source. |
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*/ |
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|
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#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
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objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
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|
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/* wrongsource * |
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* |
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* This source is the wrong source (ie. overcounted) if we are |
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* aimed to a different source than the one we hit and the one |
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* we hit is not an illum which should be passed. |
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*/ |
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|
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#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
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(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
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|
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/* distglow * |
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* |
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* A distant glow is an object that sometimes acts as a light source, |
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* but is too far away from the test point to be one in this case. |
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*/ |
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|
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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r->rot > m->oargs.farg[3]) |
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|
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/* badcomponent * |
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* |
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* We must avoid counting light sources in the ambient calculation, |
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* since the direct component is handled separately. Therefore, any |
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* ambient ray which hits an active light source must be discarded. |
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* The same is true for stray specular samples, since the specular |
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* contribution from light sources is calculated separately. |
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*/ |
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|
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#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
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!(r->crtype&SHADOW || r->rod < 0.0 || \ |
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distglow(m, r))) |
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|
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/* overcount * |
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* |
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* All overcounting possibilities are contained here. |
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*/ |
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|
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#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
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|
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/* passillum * |
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* |
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* An illum passes to another material type when we didn't hit it |
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* on purpose (as part of a direct calculation), or it is relaying |
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* a virtual light source. |
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*/ |
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|
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#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
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(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
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source[r->rsrc].sflags&SVIRTUAL)) |
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|
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/* srcignore * |
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* |
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* The -di flag renders light sources invisible, and here is the test. |
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*/ |
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|
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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|
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|
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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register RAY *r; |
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{ |
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/* check for over-counting */ |
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if (overcount(m, r)) |
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return; |
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/* check for passed illum */ |
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if (passillum(m, r)) { |
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if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
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raytrans(r); |
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else |
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rayshade(r, modifier(m->oargs.sarg[0])); |
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return; |
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} |
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/* otherwise treat as source */ |
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/* check for behind */ |
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if (r->rod < 0.0) |
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return; |
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/* check for invisibility */ |
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if (srcignore(m, r)) |
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return; |
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/* check for outside spot */ |
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if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
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return; |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |
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/* get source color */ |
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setcolor(r->rcol, m->oargs.farg[0], |
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m->oargs.farg[1], |
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m->oargs.farg[2]); |
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/* modify value */ |
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multcolor(r->rcol, r->pcol); |
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} |