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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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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 "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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static int maxcntr = 0; /* size of contribution arrays */ |
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OBJREC * /* find an object's actual material */ |
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findmaterial(register OBJREC *o) |
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{ |
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while (!ismaterial(o->otype)) { |
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if (ismixture(o->otype)) |
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return(NULL); /* reject mixed materials */ |
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if (o->otype == MOD_ALIAS && o->oargs.nsargs) { |
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OBJECT aobj; |
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OBJREC *ao; |
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aobj = lastmod(objndx(o), o->oargs.sarg[0]); |
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if (aobj < 0) |
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objerror(o, USER, "bad reference"); |
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ao = objptr(aobj); |
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if (ismaterial(ao->otype)) |
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return(ao); |
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} |
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if (o->omod == OVOID) |
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return(NULL); |
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o = objptr(o->omod); |
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} |
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return(o); |
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} |
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|
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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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o = objptr(i); |
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if (!issurface(o->otype) || o->omod == OVOID) |
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continue; |
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m = objptr(o->omod); |
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if (!islight(m->otype)) |
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continue; |
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/* find material */ |
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m = findmaterial(o); |
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if (m == NULL || !islight(m->otype)) |
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continue; /* not source modifier */ |
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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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source[ns].sflags |= SSKIP; |
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} |
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} |
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#if SHADCACHE |
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source[ns].obscache = NULL; |
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#endif |
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if (!(source[ns].sflags & SSKIP)) |
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foundsource++; |
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} |
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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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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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SRCINDEX *si; /* source sample index */ |
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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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#if SHADCACHE |
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while (nsources--) |
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freeobscache(&source[nsources]); |
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#endif |
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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( /* 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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SRCINDEX *si /* source sample index */ |
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) |
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{ |
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double d; /* distance to source */ |
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register SRCREC *srcp; |
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} |
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srcvalue(r) /* punch ray to source and compute value */ |
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register RAY *r; |
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void |
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srcvalue( /* punch ray to source and compute value */ |
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register RAY *r |
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) |
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{ |
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register SRCREC *sp; |
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} |
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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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int |
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sourcehit( /* 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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int first, last; |
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register int i; |
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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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static int |
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cntcmp(sc1, sc2) /* contribution compare (descending) */ |
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register CNTPTR *sc1, *sc2; |
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cntcmp( /* contribution compare (descending) */ |
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const void *p1, |
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const void *p2 |
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) |
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{ |
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register const CNTPTR *sc1 = (const CNTPTR *)p1; |
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register const CNTPTR *sc2 = (const CNTPTR *)p2; |
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|
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if (sc1->brt > sc2->brt) |
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return(-1); |
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if (sc1->brt < sc2->brt) |
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} |
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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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char *p; /* data for f */ |
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void |
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direct( /* add direct component */ |
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RAY *r, /* ray that hit surface */ |
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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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{ |
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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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cntord[sn].brt = bright(scp->coef); |
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if (cntord[sn].brt <= 0.0) |
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continue; |
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#if SHADCACHE |
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/* check shadow cache */ |
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if (si.np == 1 && srcblocked(&sr)) { |
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cntord[sn].brt = 0.0; |
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continue; |
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} |
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#endif |
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VCOPY(scp->dir, sr.rdir); |
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/* compute potential */ |
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sr.revf = srcvalue; |
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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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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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if (bright(sr.rcol) <= FTINY) { |
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#if SHADCACHE |
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if ((scp <= srccnt || scp[-1].sno != scp->sno) |
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&& (scp >= srccnt+ncnts-1 || |
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scp[1].sno != scp->sno)) |
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srcblocker(&sr); |
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#endif |
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continue; /* missed! */ |
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} |
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copycolor(scp->val, sr.rcol); |
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multcolor(scp->val, scp->coef); |
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} |
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} |
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srcscatter(r) /* compute source scattering into ray */ |
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register RAY *r; |
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void |
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srcscatter( /* compute source scattering into ray */ |
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register RAY *r |
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) |
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{ |
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int oldsampndx; |
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int nsamps; |
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* geometry behind (or inside) an effective radiator. |
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*/ |
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static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
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{register OBJREC *o = objptr(obj); |
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return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
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static int |
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weaksrcmat(int obj) /* identify material */ |
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{ |
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register OBJREC *o = objptr(obj); |
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|
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while (!ismaterial(o->otype)) /* find material */ |
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o = objptr(o->omod); |
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return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW)); |
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} |
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#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
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r->rod > 0.0 && \ |
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weaksrcmod(source[r->rsrc].so->omod)) |
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weaksrcmat(source[r->rsrc].so->omod)) |
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/* wrongsource * |
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* |
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distglow(m, r, raydist(r,PRIMARY))) |
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m_light(m, r) /* ray hit a light source */ |
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register OBJREC *m; |
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register RAY *r; |
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int |
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m_light( /* ray hit a light source */ |
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register OBJREC *m, |
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register RAY *r |
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) |
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{ |
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/* check for over-counting */ |
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if (badcomponent(m, r)) |