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/* Copyright (c) 1993 Regents of the University of California */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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/* |
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#include "source.h" |
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#include "random.h" |
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|
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extern double ssampdist; /* scatter sampling distance */ |
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|
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#ifndef MAXSSAMP |
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#define MAXSSAMP 16 /* maximum samples per ray */ |
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#endif |
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|
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/* |
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* Structures used by direct() |
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*/ |
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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 && spotout(sr, srcp->sl.s, 1)) |
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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)) |
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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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return; |
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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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sp->sa.success++; |
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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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} |
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if (r->ro != NULL) { |
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r->robj = objndx(r->ro); |
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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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( 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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if (!raycont(&sr)) |
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objerror(sr.ro, USER, "material not found"); |
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raycont(&sr); |
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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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} |
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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, d; |
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double re, ge, be; |
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COLOR cvext; |
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int i, j; |
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|
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if (r->slights == NULL || r->slights[0] == 0 |
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|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
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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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#if MAXSSAMP |
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else if (nsamps > MAXSSAMP) |
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nsamps = MAXSSAMP; |
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#endif |
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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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for (j = 0; j < nsamps; j++) { /* for each sample position */ |
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samplendx++; |
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t = r->rot * (j+frandom())/nsamps; |
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/* extinction */ |
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re = t*colval(r->cext,RED); |
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ge = t*colval(r->cext,GRN); |
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be = t*colval(r->cext,BLU); |
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setcolor(cvext, re > 92. ? 0. : exp(-re), |
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ge > 92. ? 0. : exp(-ge), |
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be > 92. ? 0. : exp(-be)); |
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if (intens(cvext) <= FTINY) |
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break; /* too far away */ |
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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 */ |
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copycolor(sr.cext, r->cext); |
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copycolor(sr.albedo, r->albedo); |
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sr.gecc = r->gecc; |
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sr.slights = r->slights; |
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rayvalue(&sr); /* eval. source ray */ |
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if (bright(sr.rcol) <= FTINY) |
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continue; |
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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 = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
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d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
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} |
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/* other factors */ |
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d *= si.dom * r->rot / (4.*PI*nsamps); |
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multcolor(sr.rcol, r->cext); |
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multcolor(sr.rcol, r->albedo); |
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scalecolor(sr.rcol, d); |
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multcolor(sr.rcol, cvext); |
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addcolor(r->rcol, sr.rcol); /* add it in */ |
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} |
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} |
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samplendx = oldsampndx; |
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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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* (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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#define distglow(m, r, d) (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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d > m->oargs.farg[3]) |
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/* badcomponent * |
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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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/* not 100% correct */ distglow(m, r, r->rot))) |
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/* passillum * |
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* |
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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) (!directvis && !(r->crtype&SHADOW) && \ |
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!distglow(m, r)) |
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#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
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distglow(m, r, raydist(r,PRIMARY))) |
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m_light(m, r) /* ray hit a light source */ |
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/* check for over-counting */ |
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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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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 && strcmp(m->oargs.sarg[0], VOIDID)) |
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return(rayshade(r, modifier(m->oargs.sarg[0]))); |
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return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
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raytrans(r); |
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return(1); |
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} |
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if (srcignore(m, r)) |
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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, makespot(m), r->rot>=FHUGE)) |
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if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
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return(1); |
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/* get distribution pattern */ |
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raytexture(r, m->omod); |