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/* Copyright (c) 1991 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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o = objptr(i); |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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if (!isvlight(objptr(o->omod)->otype)) |
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if (!isvlight(vsmaterial(o)->otype)) |
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continue; |
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if (sfun[o->otype].of == NULL || |
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sfun[o->otype].of->getpleq == NULL) { |
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if (o == source[sn].so) /* objects cannot project themselves */ |
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return; |
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/* get virtual source material */ |
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vsmat = sfun[objptr(o->omod)->otype].mf; |
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vsmat = sfun[vsmaterial(o)->otype].mf; |
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/* project virtual sources */ |
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for (i = 0; i < vsmat->nproj; i++) |
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if ((*vsmat->vproj)(proj, o, &source[sn], i)) |
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} |
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OBJREC * |
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vsmaterial(o) /* get virtual source material pointer */ |
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OBJREC *o; |
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{ |
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register int i; |
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register OBJREC *m; |
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|
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i = o->omod; |
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m = objptr(i); |
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if (m->otype != MAT_ILLUM || m->oargs.nsargs < 1 || |
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!strcmp(m->oargs.sarg[0], VOIDID) || |
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(i = lastmod(objndx(m), m->oargs.sarg[0])) == OVOID) |
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return(m); /* direct modifier */ |
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return(objptr(i)); /* illum alternate */ |
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} |
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|
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|
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int |
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makevsrc(op, sn, pm) /* make virtual source if reasonable */ |
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OBJREC *op; |
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normalize(nsloc); |
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VCOPY(ourspot.aim, ocent); |
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ourspot.siz = PI*maxrad2; |
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ourspot.flen = 0.; |
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ourspot.flen = -1.; |
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if (source[sn].sflags & SSPOT) { |
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multp3(theirspot.aim, source[sn].sl.s->aim, pm); |
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/* adjust for source size */ |
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d = sqrt(dist2(ourspot.aim, theirspot.aim)); |
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d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].ss; |
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d = sqrt(source[sn].sl.s->siz/PI) + d*source[sn].srad; |
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theirspot.siz = PI*d*d; |
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ourspot.flen = theirspot.flen = source[sn].sl.s->flen; |
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d = ourspot.siz; |
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if (source[sn].sflags & SPROX && d > source[sn].sl.prox) |
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return(-1); /* too far away */ |
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ourspot.flen = 0.; |
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d = (sqrt(maxrad2) + source[sn].ss) / d; |
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/* adjust for source size */ |
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d = (sqrt(maxrad2) + source[sn].srad) / d; |
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if (d < 1.-FTINY) |
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ourspot.siz = 2.*PI*(1. - sqrt(1.-d*d)); |
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else |
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goto memerr; |
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source[i].sflags = nsflags; |
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VCOPY(source[i].sloc, nsloc); |
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multv3(source[i].ss[SU], source[sn].ss[SU], pm); |
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multv3(source[i].ss[SV], source[sn].ss[SV], pm); |
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if (nsflags & SFLAT) |
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VCOPY(source[i].snorm, nsnorm); |
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source[i].ss = source[sn].ss; source[i].ss2 = source[sn].ss2; |
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else |
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multv3(source[i].ss[SW], source[sn].ss[SW], pm); |
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source[i].srad = source[sn].srad; |
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source[i].ss2 = source[sn].ss2; |
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if (nsflags & SSPOT) { |
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if ((source[i].sl.s = (SPOT *)malloc(sizeof(SPOT))) == NULL) |
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goto memerr; |
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RAY sr; |
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FVECT onorm; |
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FVECT offsdir; |
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SRCINDEX si; |
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double or, d; |
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int infront; |
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int stestlim, ssn; |
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int nhit, nok; |
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register int i, n; |
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if (source[sn].sflags & SDISTANT) { |
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/* 32. == heuristic constant */ |
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n = 32.*or2/(thescene.cusize*thescene.cusize)*vspretest + .5; |
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infront = DOT(onorm, source[sn].sloc) > 0.; |
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} else { |
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for (i = 0; i < 3; i++) |
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offsdir[i] = source[sn].sloc[i] - oc[i]; |
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n = 2.*PI * vspretest + .5; |
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else |
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n = 2.*PI * (1.-sqrt(1./(1.+or2/d)))*vspretest + .5; |
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infront = DOT(onorm, offsdir) > 0.; |
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} |
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if (n < MINSAMPLES) n = MINSAMPLES; |
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#ifdef DEBUG |
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stestlim = n*STESTMAX; |
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ssn = 0; |
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nhit = nok = 0; |
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initsrcindex(&si); |
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while (n-- > 0) { |
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/* get sample point */ |
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do { |
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for (i = 0; i < 3; i++) |
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offsdir[i] = or*(1. - 2.*offsdir[i]); |
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ssn++; |
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for (i = 0; i < 3; i++) |
350 |
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sr.rorg[i] = oc[i] + offsdir[i]; |
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d = DOT(offsdir,onorm); |
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if (infront) |
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for (i = 0; i < 3; i++) { |
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sr.rorg[i] -= (d-.0001)*onorm[i]; |
332 |
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sr.rdir[i] = -onorm[i]; |
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} |
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else |
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for (i = 0; i < 3; i++) { |
336 |
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sr.rorg[i] -= (d+.0001)*onorm[i]; |
337 |
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sr.rdir[i] = onorm[i]; |
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} |
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d = 1. - DOT(offsdir, onorm); |
350 |
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for (i = 0; i < 3; i++) { |
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sr.rorg[i] = oc[i] + offsdir[i] + d*onorm[i]; |
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sr.rdir[i] = -onorm[i]; |
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} |
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sr.rmax = 0.0; |
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rayorigin(&sr, NULL, PRIMARY, 1.0); |
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} while (!(*ofun[o->otype].funp)(o, &sr)); |
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/* check against source */ |
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VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
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samplendx++; |
360 |
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if (srcray(&sr, NULL, sn) == 0.) |
361 |
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continue; |
360 |
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if (si.sp >= si.np-1 || |
361 |
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!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
362 |
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si.sn = sn-1; /* reset index to our source */ |
363 |
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si.np = 0; |
364 |
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if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
365 |
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continue; /* can't get there from here */ |
366 |
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} |
367 |
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sr.revf = srcvalue; |
368 |
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rayvalue(&sr); |
368 |
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rayvalue(&sr); /* check sample validity */ |
369 |
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if (bright(sr.rcol) <= FTINY) |
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continue; |
371 |
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nok++; |
350 |
< |
/* check against obstructions */ |
371 |
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nok++; /* got sample; check obstructions */ |
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rayclear(&sr); |
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sr.revf = raytrace; |
374 |
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rayvalue(&sr); |