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/* Copyright (c) 1995 Regents of the University of California */ |
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/* Copyright (c) 1996 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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extern COLOR ambval; /* ambient value */ |
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extern COLOR cextinction; /* global extinction coefficient */ |
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extern double salbedo; /* global scattering albedo */ |
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extern COLOR salbedo; /* global scattering albedo */ |
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extern double seccg; /* global scattering eccentricity */ |
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extern double ssampdist; /* scatter sampling distance */ |
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r->clipset = NULL; |
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r->revf = raytrace; |
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copycolor(r->cext, cextinction); |
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r->albedo = salbedo; |
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copycolor(r->albedo, salbedo); |
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r->gecc = seccg; |
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r->slights = NULL; |
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} else { /* spawned ray */ |
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} |
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r->revf = ro->revf; |
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copycolor(r->cext, ro->cext); |
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r->albedo = ro->albedo; |
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copycolor(r->albedo, ro->albedo); |
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r->gecc = ro->gecc; |
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r->slights = ro->slights; |
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r->rweight = ro->rweight * rw; |
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{ |
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r->rno = raynum++; |
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r->newcset = r->clipset; |
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r->robj = OVOID; |
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r->ro = NULL; |
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r->rot = FHUGE; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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register RAY *r; |
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{ |
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COLOR ce, ca; |
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double dist; |
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double re, ge, be; |
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if (intens(r->cext) <= 1./FHUGE) |
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return; /* no medium */ |
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if ((dist = r->rot) >= FHUGE) |
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dist = 2.*thescene.cusize; /* what to use for infinity? */ |
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if (r->crtype & SHADOW) |
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dist *= 1. - salbedo; /* no scattering for sources */ |
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if (dist <= FTINY) |
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return; /* no effective ray travel */ |
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re = dist*colval(r->cext,RED); |
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ge = dist*colval(r->cext,GRN); |
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be = dist*colval(r->cext,BLU); |
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setcolor(ce, 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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re = r->rot*colval(r->cext,RED); |
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ge = r->rot*colval(r->cext,GRN); |
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be = r->rot*colval(r->cext,BLU); |
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if (r->crtype & SHADOW) { /* no scattering for sources */ |
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re *= 1. - colval(r->albedo,RED); |
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ge *= 1. - colval(r->albedo,GRN); |
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be *= 1. - colval(r->albedo,BLU); |
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} |
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setcolor(ce, re<=0. ? 1. : re>92. ? 0. : exp(-re), |
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ge<=0. ? 1. : ge>92. ? 0. : exp(-ge), |
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be<=0. ? 1. : be>92. ? 0. : exp(-be)); |
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multcolor(r->rcol, ce); /* path absorption */ |
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if (r->albedo <= FTINY || r->crtype & SHADOW) |
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if (r->crtype & SHADOW || intens(r->albedo) <= FTINY) |
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return; /* no scattering */ |
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setcolor(ca, salbedo*colval(ambval,RED)*(1.-colval(ce,RED)), |
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salbedo*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
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salbedo*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
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setcolor(ca, |
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colval(r->albedo,RED)*colval(ambval,RED)*(1.-colval(ce,RED)), |
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colval(r->albedo,GRN)*colval(ambval,GRN)*(1.-colval(ce,GRN)), |
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colval(r->albedo,BLU)*colval(ambval,BLU)*(1.-colval(ce,BLU))); |
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addcolor(r->rcol, ca); /* ambient in scattering */ |
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srcscatter(r); /* source in scattering */ |
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} |
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checkset(oset, cxs); /* eliminate double-checking */ |
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for (i = oset[0]; i > 0; i--) { |
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o = objptr(oset[i]); |
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(*ofun[o->otype].funp)(o, r); |
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if ((*ofun[o->otype].funp)(o, r)) |
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r->robj = oset[i]; |
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} |
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if (r->ro == NULL) |
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return(0); /* no scores yet */ |
