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/* Copyright (c) 1991 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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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Routines for simulating virtual light sources |
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* Thus far, we only support planar mirrors. |
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* |
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* External symbols declared in source.h |
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*/ |
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#include "copyright.h" |
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#include "ray.h" |
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#include "octree.h" |
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#include "otypes.h" |
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#include "source.h" |
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#define STESTMAX 32 /* maximum seeks per sample */ |
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double getdisk(); |
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static OBJECT *vobject; /* virtual source objects */ |
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static int nvobjects = 0; /* number of virtual source objects */ |
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void |
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markvirtuals() /* find and mark virtual sources */ |
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{ |
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register OBJREC *o; |
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if (directrelay <= 0) |
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return; |
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/* find virtual source objects */ |
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for (i = 0; i < nobjects; i++) { |
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for (i = 0; i < nsceneobjs; i++) { |
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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 (nvobjects == 0) |
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vobject = (OBJECT *)malloc(sizeof(OBJECT)); |
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else |
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vobject = (OBJECT *)realloc((char *)vobject, |
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vobject = (OBJECT *)realloc((void *)vobject, |
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(unsigned)(nvobjects+1)*sizeof(OBJECT)); |
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if (vobject == NULL) |
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error(SYSTEM, "out of memory in addvirtuals"); |
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for (i = nsources; i-- > 0; ) |
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addvirtuals(i, directrelay); |
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/* done with our object list */ |
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free((char *)vobject); |
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free((void *)vobject); |
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nvobjects = 0; |
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} |
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void |
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addvirtuals(sn, nr) /* add virtuals associated with source */ |
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int sn; |
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int nr; |
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} |
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void |
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vproject(o, sn, n) /* create projected source(s) if they exist */ |
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OBJREC *o; |
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int sn; |
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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 = modifier(m->oargs.sarg[0])) < 0) |
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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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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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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++) |
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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]; |
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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++) { |
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sr.rorg[i] -= (d+.0001)*onorm[i]; |
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sr.rdir[i] = onorm[i]; |
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} |
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d = 1. - DOT(offsdir, onorm); |
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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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initsrcindex(&si); |
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si.sn = sn; |
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nopart(&si, &sr); |
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VCOPY(sr.rorg, sr.rop); /* starting from intersection */ |
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samplendx++; |
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if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
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continue; |
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if (si.sp >= si.np-1 || |
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!srcray(&sr, NULL, &si) || sr.rsrc != sn) { |
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si.sn = sn-1; /* reset index to our source */ |
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si.np = 0; |
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if (!srcray(&sr, NULL, &si) || sr.rsrc != sn) |
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continue; /* can't get there from here */ |
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} |
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sr.revf = srcvalue; |
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rayvalue(&sr); |
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rayvalue(&sr); /* check sample validity */ |
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if (bright(sr.rcol) <= FTINY) |
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continue; |
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nok++; |
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/* check against obstructions */ |
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nok++; /* got sample; check obstructions */ |
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rayclear(&sr); |
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sr.revf = raytrace; |
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rayvalue(&sr); |
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#ifdef DEBUG |
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void |
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virtverb(sn, fp) /* print verbose description of virtual source */ |
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register int sn; |
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FILE *fp; |