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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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#include "source.h" |
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|
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#include "random.h" |
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|
23 |
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extern double ssampdist; /* scatter sampling distance */ |
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|
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/* |
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* Structures used by direct() |
27 |
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*/ |
72 |
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o->otype != OBJ_SOURCE && |
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m->oargs.farg[3] <= FTINY) |
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continue; /* don't bother */ |
75 |
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if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
76 |
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m->oargs.farg[2] <= FTINY) |
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continue; /* don't bother */ |
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|
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if (sfun[o->otype].of == NULL || |
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sfun[o->otype].of->setsrc == NULL) |
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sr->rsrc = si->sn; /* remember source */ |
136 |
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srcp = source + si->sn; |
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if (srcp->sflags & SDISTANT) { |
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if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
138 |
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if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
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continue; |
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return(1); /* sample OK */ |
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} |
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continue; |
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/* check angle */ |
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if (srcp->sflags & SSPOT) { |
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if (spotout(sr, srcp->sl.s, 0)) |
148 |
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if (spotout(sr, srcp->sl.s)) |
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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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|
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srcvalue(r) /* punch ray to source and compute value */ |
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RAY *r; |
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register RAY *r; |
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{ |
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register SRCREC *sp; |
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|
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/* check intersection */ |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
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return; |
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raycont(r); /* compute contribution */ |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* compute intersection */ |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
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if (sp->sa.success >= 0) |
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sp->sa.success++; |
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raycont(r); /* compute contribution */ |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* we missed our mark! */ |
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if (sp->sa.success < 0) |
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return; /* bitched already */ |
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sp->sa.success -= AIMREQT; |
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
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sp->so->oname); |
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error(WARNING, errmsg); /* issue warning */ |
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return; |
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nomat: |
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objerror(r->ro, USER, "material not found"); |
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} |
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|
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|
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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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( 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 (!raycont(&sr)) |
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objerror(sr.ro, USER, "material not found"); |
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rayparticipate(&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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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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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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|
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|
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srcscatter(r) /* compute source scattering into ray */ |
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register RAY *r; |
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{ |
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int oldsampndx; |
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int nsamps; |
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RAY sr; |
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SRCINDEX si; |
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double t, lastt, d; |
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COLOR cumval, ctmp; |
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int i, j; |
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|
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if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY) |
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return; |
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if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
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nsamps = 1; |
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oldsampndx = samplendx; |
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samplendx = random()&0x7fff; /* randomize */ |
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for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
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setcolor(cumval, 0., 0., 0.); |
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lastt = r->rot; |
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for (j = nsamps; j-- > 0; ) { /* for each sample position */ |
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samplendx++; |
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t = r->rot * (j+frandom())/nsamps; |
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sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
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sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
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sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
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sr.rmax = 0.; |
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initsrcindex(&si); /* sample ray to this source */ |
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si.sn = r->slights[i]; |
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nopart(&si, &sr); |
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if (!srcray(&sr, NULL, &si) || |
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sr.rsrc != r->slights[i]) |
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continue; /* no path */ |
407 |
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copycolor(sr.cext, r->cext); |
408 |
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sr.albedo = r->albedo; |
409 |
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sr.gecc = r->gecc; |
410 |
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rayvalue(&sr); /* eval. source ray */ |
411 |
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if (bright(sr.rcol) <= FTINY) |
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continue; |
413 |
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/* compute fall-off */ |
414 |
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d = lastt - t; |
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setcolor(ctmp, 1.-d*colval(r->cext,RED), |
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1.-d*colval(r->cext,GRN), |
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1.-d*colval(r->cext,BLU)); |
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multcolor(cumval, ctmp); |
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lastt = t; |
420 |
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if (r->gecc <= FTINY) /* compute P(theta) */ |
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d = 1.; |
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else { |
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d = DOT(r->rdir, sr.rdir); |
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d = sqrt(1. + r->gecc*r->gecc - 2.*r->gecc*d); |
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d = (1. - r->gecc*r->gecc) / (d*d*d); |
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} |
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/* other factors */ |
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d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps); |
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multcolor(sr.rcol, r->cext); |
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scalecolor(sr.rcol, d); |
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addcolor(cumval, sr.rcol); |
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} |
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/* final fall-off */ |
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setcolor(ctmp, 1.-lastt*colval(r->cext,RED), |
435 |
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1.-lastt*colval(r->cext,GRN), |
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1.-lastt*colval(r->cext,BLU)); |
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multcolor(cumval, ctmp); |
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addcolor(r->rcol, cumval); /* sum into ray result */ |
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} |
440 |
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samplendx = oldsampndx; |
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} |
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|
443 |
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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 * |
449 |
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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. |
455 |
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* We also prevent an illum from passing to a glow; this provides a |
456 |
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* convenient mechanism for defining detailed light source |
457 |
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* geometry behind (or inside) an effective radiator. |
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*/ |
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|
460 |
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#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
461 |
< |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
460 |
> |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
461 |
> |
{register OBJREC *o = objptr(obj); |
462 |
> |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
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|
464 |
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#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
465 |
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r->rod > 0.0 && \ |
466 |
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weaksrcmod(source[r->rsrc].so->omod)) |
467 |
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|
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/* wrongsource * |
469 |
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* |
470 |
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* This source is the wrong source (ie. overcounted) if we are |
471 |
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* aimed to a different source than the one we hit and the one |
472 |
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* we hit is not an illum which should be passed. |
472 |
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* we hit is not an illum that should be passed. |
473 |
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*/ |
474 |
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|
475 |
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#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
476 |
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(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
476 |
> |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
477 |
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|
478 |
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/* distglow * |
479 |
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* |
480 |
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* A distant glow is an object that sometimes acts as a light source, |
481 |
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* but is too far away from the test point to be one in this case. |
482 |
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* (Glows with negative radii should NEVER participate in illumination.) |
483 |
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*/ |
484 |
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|
485 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
486 |
< |
r->rot > m->oargs.farg[3]) |
485 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
486 |
> |
m->oargs.farg[3] >= -FTINY && \ |
487 |
> |
d > m->oargs.farg[3]) |
488 |
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|
489 |
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/* badcomponent * |
490 |
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* |
497 |
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|
498 |
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#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
499 |
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!(r->crtype&SHADOW || r->rod < 0.0 || \ |
500 |
< |
distglow(m, r))) |
500 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
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|
401 |
– |
/* overcount * |
402 |
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* |
403 |
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* All overcounting possibilities are contained here. |
404 |
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*/ |
405 |
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|
406 |
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#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
407 |
– |
|
502 |
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/* passillum * |
503 |
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* |
504 |
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* An illum passes to another material type when we didn't hit it |
512 |
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|
513 |
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/* srcignore * |
514 |
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* |
515 |
< |
* The -di flag renders light sources invisible, and here is the test. |
515 |
> |
* The -dv flag is normally on for sources to be visible. |
516 |
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*/ |
517 |
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|
518 |
< |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
519 |
< |
!distglow(m, r)) |
518 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
519 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
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|
521 |
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|
522 |
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m_light(m, r) /* ray hit a light source */ |
524 |
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register RAY *r; |
525 |
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{ |
526 |
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/* check for over-counting */ |
527 |
< |
if (overcount(m, r)) |
528 |
< |
return; |
527 |
> |
if (badcomponent(m, r)) |
528 |
> |
return(1); |
529 |
> |
if (wrongsource(m, r)) |
530 |
> |
return(1); |
531 |
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/* check for passed illum */ |
532 |
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if (passillum(m, r)) { |
533 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
534 |
< |
raytrans(r); |
535 |
< |
else |
536 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
441 |
< |
return; |
533 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
534 |
> |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
535 |
> |
raytrans(r); |
536 |
> |
return(1); |
537 |
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} |
538 |
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/* otherwise treat as source */ |
539 |
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/* check for behind */ |
540 |
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if (r->rod < 0.0) |
541 |
< |
return; |
541 |
> |
return(1); |
542 |
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/* check for invisibility */ |
543 |
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if (srcignore(m, r)) |
544 |
< |
return; |
544 |
> |
return(1); |
545 |
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/* check for outside spot */ |
546 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
547 |
< |
return; |
546 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
547 |
> |
return(1); |
548 |
|
/* get distribution pattern */ |
549 |
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raytexture(r, m->omod); |
550 |
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/* get source color */ |
553 |
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m->oargs.farg[2]); |
554 |
|
/* modify value */ |
555 |
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multcolor(r->rcol, r->pcol); |
556 |
+ |
return(1); |
557 |
|
} |