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/* Copyright (c) 1995 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 "ray.h" |
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|
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#include "octree.h" |
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|
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#include "otypes.h" |
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|
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#include "source.h" |
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static int maxcntr = 0; /* size of contribution arrays */ |
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|
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|
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OBJREC * /* find an object's actual material */ |
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findmaterial(register OBJREC *o) |
47 |
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{ |
48 |
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while (!ismaterial(o->otype)) { |
49 |
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if (ismixture(o->otype)) |
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return(NULL); /* reject mixed materials */ |
51 |
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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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|
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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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m = objptr(o->omod); |
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|
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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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|
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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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|
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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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} |
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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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} |
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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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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)(); |
317 |
> |
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; |
405 |
> |
source[scp->sno].nhits >>= 1; |
406 |
> |
} |
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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 */ |
415 |
< |
if (bright(sr.rcol) <= FTINY) |
415 |
> |
if (bright(sr.rcol) <= FTINY) { |
416 |
> |
#if SHADCACHE |
417 |
> |
if ((scp <= srccnt || scp[-1].sno != scp->sno) |
418 |
> |
&& (scp >= srccnt+ncnts-1 || |
419 |
> |
scp[1].sno != scp->sno)) |
420 |
> |
srcblocker(&sr); |
421 |
> |
#endif |
422 |
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continue; /* missed! */ |
423 |
+ |
} |
424 |
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copycolor(scp->val, sr.rcol); |
425 |
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multcolor(scp->val, scp->coef); |
426 |
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} |
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} |
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|
454 |
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|
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< |
srcscatter(r) /* compute source scattering into ray */ |
456 |
< |
register RAY *r; |
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> |
void |
456 |
> |
srcscatter( /* compute source scattering into ray */ |
457 |
> |
register RAY *r |
458 |
> |
) |
459 |
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{ |
460 |
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int oldsampndx; |
461 |
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int nsamps; |
462 |
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RAY sr; |
463 |
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SRCINDEX si; |
464 |
< |
double t, lastt, d; |
465 |
< |
COLOR cumval, ctmp; |
464 |
> |
double t, d; |
465 |
> |
double re, ge, be; |
466 |
> |
COLOR cvext; |
467 |
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int i, j; |
468 |
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|
469 |
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if (r->slights == NULL || r->slights[0] == 0 |
478 |
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oldsampndx = samplendx; |
479 |
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samplendx = random()&0x7fff; /* randomize */ |
480 |
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for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
481 |
< |
setcolor(cumval, 0., 0., 0.); |
401 |
< |
lastt = r->rot; |
402 |
< |
for (j = nsamps; j-- > 0; ) { /* for each sample position */ |
481 |
> |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
482 |
|
samplendx++; |
483 |
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t = r->rot * (j+frandom())/nsamps; |
484 |
+ |
/* extinction */ |
485 |
+ |
re = t*colval(r->cext,RED); |
486 |
+ |
ge = t*colval(r->cext,GRN); |
487 |
+ |
be = t*colval(r->cext,BLU); |
488 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
489 |
+ |
ge > 92. ? 0. : exp(-ge), |
490 |
+ |
be > 92. ? 0. : exp(-be)); |
491 |
+ |
if (intens(cvext) <= FTINY) |
492 |
+ |
break; /* too far away */ |
493 |
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sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
494 |
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sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
495 |
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sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
501 |
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sr.rsrc != r->slights[i]) |
502 |
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continue; /* no path */ |
503 |
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copycolor(sr.cext, r->cext); |
504 |
< |
sr.albedo = r->albedo; |
504 |
> |
copycolor(sr.albedo, r->albedo); |
505 |
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sr.gecc = r->gecc; |
506 |
+ |
sr.slights = r->slights; |
507 |
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rayvalue(&sr); /* eval. source ray */ |
508 |
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if (bright(sr.rcol) <= FTINY) |
509 |
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continue; |
421 |
– |
/* compute fall-off */ |
422 |
– |
d = lastt - t; |
423 |
– |
setcolor(ctmp, 1.-d*colval(r->cext,RED), |
424 |
– |
1.-d*colval(r->cext,GRN), |
425 |
– |
1.-d*colval(r->cext,BLU)); |
426 |
– |
multcolor(cumval, ctmp); |
427 |
– |
lastt = t; |
510 |
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if (r->gecc <= FTINY) /* compute P(theta) */ |
511 |
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d = 1.; |
512 |
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else { |
513 |
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d = DOT(r->rdir, sr.rdir); |
514 |
< |
d = sqrt(1. + r->gecc*r->gecc - 2.*r->gecc*d); |
515 |
< |
d = (1. - r->gecc*r->gecc) / (d*d*d); |
514 |
> |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
515 |
> |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
516 |
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} |
517 |
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/* other factors */ |
518 |
< |
d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps); |
518 |
> |
d *= si.dom * r->rot / (4.*PI*nsamps); |
519 |
|
multcolor(sr.rcol, r->cext); |
520 |
+ |
multcolor(sr.rcol, r->albedo); |
521 |
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scalecolor(sr.rcol, d); |
522 |
< |
addcolor(cumval, sr.rcol); |
522 |
> |
multcolor(sr.rcol, cvext); |
523 |
> |
addcolor(r->rcol, sr.rcol); /* add it in */ |
524 |
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} |
441 |
– |
/* final fall-off */ |
442 |
– |
setcolor(ctmp, 1.-lastt*colval(r->cext,RED), |
443 |
– |
1.-lastt*colval(r->cext,GRN), |
444 |
– |
1.-lastt*colval(r->cext,BLU)); |
445 |
– |
multcolor(cumval, ctmp); |
446 |
– |
addcolor(r->rcol, cumval); /* sum into ray result */ |
525 |
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} |
526 |
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samplendx = oldsampndx; |
527 |
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} |
543 |
|
* geometry behind (or inside) an effective radiator. |
544 |
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*/ |
545 |
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|
546 |
< |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
547 |
< |
{register OBJREC *o = objptr(obj); |
548 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
546 |
> |
static int |
547 |
> |
weaksrcmat(int obj) /* identify material */ |
548 |
> |
{ |
549 |
> |
register OBJREC *o = objptr(obj); |
550 |
> |
|
551 |
> |
while (!ismaterial(o->otype)) /* find material */ |
552 |
> |
o = objptr(o->omod); |
553 |
> |
return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW)); |
554 |
> |
} |
555 |
|
|
556 |
|
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
557 |
|
r->rod > 0.0 && \ |
558 |
< |
weaksrcmod(source[r->rsrc].so->omod)) |
558 |
> |
weaksrcmat(source[r->rsrc].so->omod)) |
559 |
|
|
560 |
|
/* wrongsource * |
561 |
|
* |
611 |
|
distglow(m, r, raydist(r,PRIMARY))) |
612 |
|
|
613 |
|
|
614 |
< |
m_light(m, r) /* ray hit a light source */ |
615 |
< |
register OBJREC *m; |
616 |
< |
register RAY *r; |
614 |
> |
int |
615 |
> |
m_light( /* ray hit a light source */ |
616 |
> |
register OBJREC *m, |
617 |
> |
register RAY *r |
618 |
> |
) |
619 |
|
{ |
620 |
|
/* check for over-counting */ |
621 |
|
if (badcomponent(m, r)) |
625 |
|
/* check for passed illum */ |
626 |
|
if (passillum(m, r)) { |
627 |
|
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
628 |
< |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
628 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
629 |
|
raytrans(r); |
630 |
|
return(1); |
631 |
|
} |