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extern double ssampdist; /* scatter sampling distance */ |
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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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* Structures used by direct() |
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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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COLOR cumval, ctmp; |
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int i, j; |
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if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY) |
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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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< |
initsrcindex(&si); |
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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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setcolor(cumval, 0., 0., 0.); |
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lastt = r->rot; |
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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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< |
/* sample ray to this source */ |
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if (si.sp >= si.np-1 || !srcray(&sr, NULL, &si) || |
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sr.rsrc != r->slights[i]) { |
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si.sn = r->slights[i]-1; /* reset */ |
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< |
si.np = 0; |
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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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} |
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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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sr.albedo = r->albedo; |
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sr.gecc = r->gecc; |
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multcolor(cumval, ctmp); |
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addcolor(r->rcol, cumval); /* sum into ray result */ |
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} |
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+ |
samplendx = oldsampndx; |
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} |
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