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/* Copyright (c) 1992 Regents of the University of California */ |
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/* Copyright (c) 1993 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 (m->otype == MAT_GLOW) { |
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source[ns].sflags |= SPROX; |
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source[ns].sl.prox = m->oargs.farg[3]; |
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if (o->otype == OBJ_SOURCE) |
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if (source[ns].sflags & SDISTANT) |
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source[ns].sflags |= SSKIP; |
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} else if (m->otype == MAT_SPOT) { |
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source[ns].sflags |= SSPOT; |
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char *p; /* data for f */ |
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{ |
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extern int (*trace)(); |
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extern double pow(); |
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register int sn; |
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register CONTRIB *scp; |
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SRCINDEX si; |
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int nshadcheck, ncnts; |
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int nhits; |
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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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srccnt[sn].sno = sr.rsrc; |
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scp = srccnt + sn; |
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scp->sno = sr.rsrc; |
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/* compute coefficient */ |
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(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
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cntord[sn].brt = bright(srccnt[sn].coef); |
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(*f)(scp->coef, p, sr.rdir, si.dom); |
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cntord[sn].brt = bright(scp->coef); |
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if (cntord[sn].brt <= 0.0) |
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continue; |
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VCOPY(srccnt[sn].dir, sr.rdir); |
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VCOPY(scp->dir, sr.rdir); |
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/* compute potential */ |
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sr.revf = srcvalue; |
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rayvalue(&sr); |
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copycolor(srccnt[sn].val, sr.rcol); |
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multcolor(srccnt[sn].val, srccnt[sn].coef); |
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cntord[sn].brt = bright(srccnt[sn].val); |
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copycolor(scp->val, sr.rcol); |
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multcolor(scp->val, scp->coef); |
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cntord[sn].brt = bright(scp->val); |
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} |
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/* sort contributions */ |
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qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
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/* modify threshold */ |
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ourthresh = shadthresh / r->rweight; |
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/* test for shadows */ |
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nhits = 0; |
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for (sn = 0; sn < ncnts; sn++) { |
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for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
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hwt += (double)source[scp->sno].nhits / |
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(double)source[scp->sno].ntests, |
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sn++) { |
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/* check threshold */ |
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if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
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cntord[sn].brt-cntord[sn+nshadcheck].brt) |
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< ourthresh*bright(r->rcol)) |
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break; |
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scp = srccnt + cntord[sn].sndx; |
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/* test for hit */ |
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rayorigin(&sr, r, SHADOW, 1.0); |
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VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
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sr.rsrc = srccnt[cntord[sn].sndx].sno; |
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source[sr.rsrc].ntests++; /* keep statistics */ |
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VCOPY(sr.rdir, scp->dir); |
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sr.rsrc = scp->sno; |
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source[scp->sno].ntests++; /* keep statistics */ |
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if (localhit(&sr, &thescene) && |
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( sr.ro != source[sr.rsrc].so || |
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source[sr.rsrc].sflags & SFOLLOW )) { |
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( sr.ro != source[scp->sno].so || |
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source[scp->sno].sflags & SFOLLOW )) { |
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/* follow entire path */ |
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raycont(&sr); |
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if (trace != NULL) |
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(*trace)(&sr); /* trace execution */ |
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if (bright(sr.rcol) <= FTINY) |
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continue; /* missed! */ |
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copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
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multcolor(srccnt[cntord[sn].sndx].val, |
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srccnt[cntord[sn].sndx].coef); |
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copycolor(scp->val, sr.rcol); |
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multcolor(scp->val, scp->coef); |
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} |
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/* add contribution if hit */ |
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addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
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addcolor(r->rcol, scp->val); |
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nhits++; |
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source[sr.rsrc].nhits++; |
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source[scp->sno].nhits++; |
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} |
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/* surface hit rate */ |
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if (sn > 0) |
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hwt = (double)nhits / (double)sn; |
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/* source hit rate */ |
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if (hwt > FTINY) |
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hwt = (double)nhits / hwt; |
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else |
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hwt = 0.5; |
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#ifdef DEBUG |
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sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
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sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
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sn, ncnts-sn, hwt); |
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eputs(errmsg); |
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#endif |
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/* add in untested sources */ |
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for ( ; sn < ncnts; sn++) { |
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sr.rsrc = srccnt[cntord[sn].sndx].sno; |
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prob = hwt * (double)source[sr.rsrc].nhits / |
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(double)source[sr.rsrc].ntests; |
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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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scp = srccnt + cntord[sn].sndx; |
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prob = hwt * (double)source[scp->sno].nhits / |
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(double)source[scp->sno].ntests; |
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if (prob > 1.0) |
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prob = 1.0; |
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scalecolor(scp->val, prob); |
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addcolor(r->rcol, scp->val); |
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} |
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} |
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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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/* illumblock * |
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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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* We also prevent an illum from passing to a glow; this provides a |
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* convenient mechanism for defining detailed light source |
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* geometry behind (or inside) an effective radiator. |
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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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static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
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{register OBJREC *o = objptr(obj); |
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return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
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|
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#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
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r->rod > 0.0 && \ |
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weaksrcmod(source[r->rsrc].so->omod)) |
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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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* we hit is not an illum that should be passed. |
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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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(m->otype!=MAT_ILLUM || illumblock(m,r))) |
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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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* (Glows with negative radii should NEVER participate in illumination.) |
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*/ |
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#define distglow(m, r) (m->otype==MAT_GLOW && \ |
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m->oargs.farg[3] >= -FTINY && \ |
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r->rot > m->oargs.farg[3]) |
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|
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/* badcomponent * |
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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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#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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/* 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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* The -dv flag is normally on for sources to be visible. |
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*/ |
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#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
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#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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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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if (badcomponent(m, r)) |
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return(1); |
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if (wrongsource(m,r)) |
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return(1); |
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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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if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
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return(rayshade(r, modifier(m->oargs.sarg[0]))); |
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raytrans(r); |
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return(1); |
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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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return(1); |
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/* check for invisibility */ |
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if (srcignore(m, r)) |
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return; |
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return(1); |
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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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if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
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return(1); |
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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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m->oargs.farg[2]); |
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/* modify value */ |
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multcolor(r->rcol, r->pcol); |
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return(1); |
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} |
