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/* Copyright (c) 1993 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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/* |
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* source.c - routines dealing with illumination sources. |
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* |
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* 8/20/85 |
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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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|
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#include "ray.h" |
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#include "octree.h" |
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|
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#include "otypes.h" |
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#include "source.h" |
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#include "random.h" |
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|
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extern double ssampdist; /* scatter sampling distance */ |
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|
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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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/* |
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* Structures used by direct() |
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*/ |
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static int maxcntr = 0; /* size of contribution arrays */ |
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void |
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marksources() /* find and mark source objects */ |
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{ |
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int foundsource = 0; |
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/* initialize dispatch table */ |
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initstypes(); |
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/* find direct sources */ |
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for (i = 0; i < nobjects; i++) { |
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for (i = 0; i < nsceneobjs; i++) { |
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|
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o = objptr(i); |
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|
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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|
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/* find material */ |
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m = objptr(o->omod); |
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|
66 |
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if (!islight(m->otype)) |
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continue; |
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while (!ismaterial(m->otype)) |
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if (ismixture(m->otype) || m->omod == OVOID) { |
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m = NULL; |
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break; |
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} else |
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m = objptr(m->omod); |
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if (m == NULL || !islight(m->otype)) |
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continue; /* not source modifier */ |
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|
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if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
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m->otype == MAT_SPOT ? 7 : 3)) |
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maxcntr = nsources + MAXSPART; /* start with this many */ |
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srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
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if (srccnt == NULL | cntord == NULL) |
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if ((srccnt == NULL) | (cntord == NULL)) |
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goto memerr; |
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return; |
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memerr: |
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} |
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void |
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freesources() /* free all source structures */ |
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{ |
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if (nsources > 0) { |
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free((void *)source); |
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source = NULL; |
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nsources = 0; |
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} |
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if (maxcntr <= 0) |
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return; |
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free((void *)srccnt); |
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srccnt = NULL; |
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free((void *)cntord); |
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cntord = NULL; |
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maxcntr = 0; |
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} |
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|
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|
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int |
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srcray(sr, r, si) /* send a ray to a source, return domega */ |
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register RAY *sr; /* returned source ray */ |
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RAY *r; /* ray which hit object */ |
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sr->rsrc = si->sn; /* remember source */ |
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srcp = source + si->sn; |
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if (srcp->sflags & SDISTANT) { |
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if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
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if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
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continue; |
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return(1); /* sample OK */ |
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} |
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continue; |
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/* check angle */ |
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if (srcp->sflags & SSPOT) { |
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if (spotout(sr, srcp->sl.s, 0)) |
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if (spotout(sr, srcp->sl.s)) |
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continue; |
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/* adjust solid angle */ |
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si->dom *= d*d; |
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} |
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void |
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srcvalue(r) /* punch ray to source and compute value */ |
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register RAY *r; |
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{ |
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return; |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* compute intersection */ |
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sp->sa.success++; |
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if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
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goto nomat; |
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rayparticipate(r); |
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return; |
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} |
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/* we missed our mark! */ |
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} |
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int |
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sourcehit(r) /* check to see if ray hit distant source */ |
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register RAY *r; |
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{ |
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} |
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if (r->ro != NULL) { |
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r->robj = objndx(r->ro); |
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for (i = 0; i < 3; i++) |
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r->ron[i] = -r->rdir[i]; |
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r->rod = 1.0; |
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r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
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r->uv[0] = r->uv[1] = 0.0; |
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r->rox = NULL; |
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return(1); |
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} |
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} |
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void |
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direct(r, f, p) /* add direct component */ |
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RAY *r; /* ray that hit surface */ |
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int (*f)(); /* direct component coefficient function */ |
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void (*f)(); /* direct component coefficient function */ |
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char *p; /* data for f */ |
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{ |
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extern int (*trace)(); |
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extern void (*trace)(); |
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register int sn; |
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register CONTRIB *scp; |
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SRCINDEX si; |
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for (sn = 0; srcray(&sr, r, &si); sn++) { |
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if (sn >= maxcntr) { |
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maxcntr = sn + MAXSPART; |
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srccnt = (CONTRIB *)realloc((char *)srccnt, |
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srccnt = (CONTRIB *)realloc((void *)srccnt, |
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maxcntr*sizeof(CONTRIB)); |
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cntord = (CNTPTR *)realloc((char *)cntord, |
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cntord = (CNTPTR *)realloc((void *)cntord, |
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maxcntr*sizeof(CNTPTR)); |
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if (srccnt == NULL | cntord == NULL) |
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if ((srccnt == NULL) | (cntord == NULL)) |
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error(SYSTEM, "out of memory in direct"); |
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} |
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cntord[sn].sndx = sn; |
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rayorigin(&sr, r, SHADOW, 1.0); |
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VCOPY(sr.rdir, scp->dir); |
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sr.rsrc = scp->sno; |
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source[scp->sno].ntests++; /* keep statistics */ |
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/* keep statistics */ |
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if (source[scp->sno].ntests++ > 0xfffffff0) { |
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source[scp->sno].ntests >>= 1; |
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source[scp->sno].nhits >>= 1; |
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} |
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if (localhit(&sr, &thescene) && |
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( sr.ro != source[scp->sno].so || |
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source[scp->sno].sflags & SFOLLOW )) { |
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/* follow entire path */ |
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if (!raycont(&sr)) |
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objerror(sr.ro, USER, "material not found"); |
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raycont(&sr); |
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rayparticipate(&sr); |
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if (trace != NULL) |
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(*trace)(&sr); /* trace execution */ |
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if (bright(sr.rcol) <= FTINY) |
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} |
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|
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void |
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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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double t, d; |
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double re, ge, be; |
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COLOR cvext; |
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int i, j; |
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|
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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) |
426 |
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nsamps = 1; |
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#if MAXSSAMP |
428 |
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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 */ |
433 |
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for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
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for (j = 0; j < nsamps; j++) { /* for each sample position */ |
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samplendx++; |
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t = r->rot * (j+frandom())/nsamps; |
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/* extinction */ |
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re = t*colval(r->cext,RED); |
439 |
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ge = t*colval(r->cext,GRN); |
440 |
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be = t*colval(r->cext,BLU); |
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setcolor(cvext, re > 92. ? 0. : exp(-re), |
442 |
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ge > 92. ? 0. : exp(-ge), |
443 |
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be > 92. ? 0. : exp(-be)); |
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if (intens(cvext) <= FTINY) |
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break; /* too far away */ |
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sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
447 |
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sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
448 |
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sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
449 |
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sr.rmax = 0.; |
450 |
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initsrcindex(&si); /* sample ray to this source */ |
451 |
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si.sn = r->slights[i]; |
452 |
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nopart(&si, &sr); |
453 |
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if (!srcray(&sr, NULL, &si) || |
454 |
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sr.rsrc != r->slights[i]) |
455 |
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continue; /* no path */ |
456 |
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copycolor(sr.cext, r->cext); |
457 |
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copycolor(sr.albedo, r->albedo); |
458 |
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sr.gecc = r->gecc; |
459 |
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sr.slights = r->slights; |
460 |
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rayvalue(&sr); /* eval. source ray */ |
461 |
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if (bright(sr.rcol) <= FTINY) |
462 |
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continue; |
463 |
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if (r->gecc <= FTINY) /* compute P(theta) */ |
464 |
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d = 1.; |
465 |
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else { |
466 |
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d = DOT(r->rdir, sr.rdir); |
467 |
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d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
468 |
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d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
469 |
+ |
} |
470 |
+ |
/* other factors */ |
471 |
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d *= si.dom * r->rot / (4.*PI*nsamps); |
472 |
+ |
multcolor(sr.rcol, r->cext); |
473 |
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multcolor(sr.rcol, r->albedo); |
474 |
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scalecolor(sr.rcol, d); |
475 |
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multcolor(sr.rcol, cvext); |
476 |
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addcolor(r->rcol, sr.rcol); /* add it in */ |
477 |
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} |
478 |
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} |
479 |
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samplendx = oldsampndx; |
480 |
+ |
} |
481 |
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|
482 |
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|
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/**************************************************************** |
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* The following macros were separated from the m_light() routine |
485 |
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* because they are very nasty and difficult to understand. |
498 |
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|
499 |
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static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
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{register OBJREC *o = objptr(obj); |
501 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
501 |
> |
return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW));} |
502 |
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|
503 |
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#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
504 |
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r->rod > 0.0 && \ |
521 |
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* (Glows with negative radii should NEVER participate in illumination.) |
522 |
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*/ |
523 |
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|
524 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
524 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
525 |
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m->oargs.farg[3] >= -FTINY && \ |
526 |
< |
r->rot > m->oargs.farg[3]) |
526 |
> |
d > m->oargs.farg[3]) |
527 |
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|
528 |
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/* badcomponent * |
529 |
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* |
536 |
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|
537 |
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#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
538 |
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!(r->crtype&SHADOW || r->rod < 0.0 || \ |
539 |
< |
distglow(m, r))) |
539 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
540 |
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|
541 |
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/* passillum * |
542 |
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* |
554 |
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* The -dv flag is normally on for sources to be visible. |
555 |
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*/ |
556 |
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|
557 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
558 |
< |
!distglow(m, r)) |
557 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
558 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
559 |
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|
560 |
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|
561 |
+ |
int |
562 |
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m_light(m, r) /* ray hit a light source */ |
563 |
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register OBJREC *m; |
564 |
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register RAY *r; |
566 |
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/* check for over-counting */ |
567 |
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if (badcomponent(m, r)) |
568 |
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return(1); |
569 |
< |
if (wrongsource(m,r)) |
569 |
> |
if (wrongsource(m, r)) |
570 |
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return(1); |
571 |
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/* check for passed illum */ |
572 |
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if (passillum(m, r)) { |
573 |
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if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
574 |
< |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
574 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
575 |
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raytrans(r); |
576 |
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return(1); |
577 |
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} |
583 |
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if (srcignore(m, r)) |
584 |
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return(1); |
585 |
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/* check for outside spot */ |
586 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
586 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
587 |
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return(1); |
588 |
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/* get distribution pattern */ |
589 |
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raytexture(r, m->omod); |