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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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RAY *r; |
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{ |
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extern int (*trace)(); |
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int gotmat; |
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if (localhit(r, &thescene)) |
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gotmat = raycont(r); /* hit local surface, evaluate */ |
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raycont(r); /* hit local surface, evaluate */ |
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else if (r->ro == &Aftplane) { |
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r->ro = NULL; /* hit aft clipping plane */ |
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r->rot = FHUGE; |
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} else if (sourcehit(r)) |
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gotmat = rayshade(r, r->ro->omod); /* distant source */ |
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rayshade(r, r->ro->omod); /* distant source */ |
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if (r->ro != NULL && !gotmat) |
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objerror(r->ro, USER, "material not found"); |
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rayparticipate(r); /* for participating medium */ |
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if (trace != NULL) |
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register RAY *r; |
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{ |
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if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) || |
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r->ro->omod == OVOID) { |
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!rayshade(r, r->ro->omod)) |
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raytrans(r); |
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return(1); |
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} |
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return(rayshade(r, r->ro->omod)); |
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} |
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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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RAY fr, br; |
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int foremat, backmat; |
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register int i; |
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/* clip coefficient */ |
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/* bound coefficient */ |
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if (coef > 1.0) |
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coef = 1.0; |
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else if (coef < 0.0) |
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coef = 0.0; |
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/* compute foreground and background */ |
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foremat = backmat = -1; |
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foremat = backmat = 0; |
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/* foreground */ |
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copystruct(&fr, r); |
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if (fore != OVOID && coef > FTINY) |
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if (coef > FTINY) |
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foremat = rayshade(&fr, fore); |
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/* background */ |
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copystruct(&br, r); |
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if (back != OVOID && coef < 1.0-FTINY) |
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if (coef < 1.0-FTINY) |
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backmat = rayshade(&br, back); |
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/* check */ |
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if (foremat < 0) |
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if (backmat < 0) |
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foremat = backmat = 0; |
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/* check for transparency */ |
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if (backmat ^ foremat) |
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if (backmat) |
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raytrans(&fr); |
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else |
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foremat = backmat; |
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else if (backmat < 0) |
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backmat = foremat; |
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if ((foremat==0) != (backmat==0)) |
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objerror(r->ro, USER, "mixing material with non-material"); |
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raytrans(&br); |
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/* mix perturbations */ |
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for (i = 0; i < 3; i++) |
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r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i]; |
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scalecolor(br.pcol, 1.0-coef); |
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copycolor(r->pcol, fr.pcol); |
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addcolor(r->pcol, br.pcol); |
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/* mix returned ray values */ |
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if (foremat) { |
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scalecolor(fr.rcol, coef); |
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scalecolor(br.rcol, 1.0-coef); |
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copycolor(r->rcol, fr.rcol); |
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addcolor(r->rcol, br.rcol); |
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r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
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} |
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/* return value tells if material */ |
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return(foremat); |
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if (!foremat & !backmat) |
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return(0); |
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/* mix returned ray values */ |
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scalecolor(fr.rcol, coef); |
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scalecolor(br.rcol, 1.0-coef); |
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copycolor(r->rcol, fr.rcol); |
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addcolor(r->rcol, br.rcol); |
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r->rt = bright(fr.rcol) > bright(br.rcol) ? fr.rt : br.rt; |
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return(1); |
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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 */ |