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Comparing ray/src/rt/source.c (file contents):
Revision 2.20 by greg, Sat Dec 9 11:30:19 1995 UTC vs.
Revision 2.29 by greg, Sat Feb 22 02:07:29 2003 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1995 Regents of the University of California */
2 –
1   #ifndef lint
2 < static char SCCSid[] = "$SunId$ LBL";
2 > static const char       RCSid[] = "$Id$";
3   #endif
6 –
4   /*
5   *  source.c - routines dealing with illumination sources.
6   *
7 < *     8/20/85
7 > *  External symbols declared in source.h
8   */
9  
10 + /* ====================================================================
11 + * The Radiance Software License, Version 1.0
12 + *
13 + * Copyright (c) 1990 - 2002 The Regents of the University of California,
14 + * through Lawrence Berkeley National Laboratory.   All rights reserved.
15 + *
16 + * Redistribution and use in source and binary forms, with or without
17 + * modification, are permitted provided that the following conditions
18 + * are met:
19 + *
20 + * 1. Redistributions of source code must retain the above copyright
21 + *         notice, this list of conditions and the following disclaimer.
22 + *
23 + * 2. Redistributions in binary form must reproduce the above copyright
24 + *       notice, this list of conditions and the following disclaimer in
25 + *       the documentation and/or other materials provided with the
26 + *       distribution.
27 + *
28 + * 3. The end-user documentation included with the redistribution,
29 + *           if any, must include the following acknowledgment:
30 + *             "This product includes Radiance software
31 + *                 (http://radsite.lbl.gov/)
32 + *                 developed by the Lawrence Berkeley National Laboratory
33 + *               (http://www.lbl.gov/)."
34 + *       Alternately, this acknowledgment may appear in the software itself,
35 + *       if and wherever such third-party acknowledgments normally appear.
36 + *
37 + * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
38 + *       and "The Regents of the University of California" must
39 + *       not be used to endorse or promote products derived from this
40 + *       software without prior written permission. For written
41 + *       permission, please contact [email protected].
42 + *
43 + * 5. Products derived from this software may not be called "Radiance",
44 + *       nor may "Radiance" appear in their name, without prior written
45 + *       permission of Lawrence Berkeley National Laboratory.
46 + *
47 + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
48 + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
50 + * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
51 + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52 + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53 + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54 + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55 + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56 + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57 + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 + * SUCH DAMAGE.
59 + * ====================================================================
60 + *
61 + * This software consists of voluntary contributions made by many
62 + * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
63 + * information on Lawrence Berkeley National Laboratory, please see
64 + * <http://www.lbl.gov/>.
65 + */
66 +
67   #include  "ray.h"
68  
15 – #include  "octree.h"
16 –
69   #include  "otypes.h"
70  
71   #include  "source.h"
# Line 22 | Line 74 | static char SCCSid[] = "$SunId$ LBL";
74  
75   extern double  ssampdist;               /* scatter sampling distance */
76  
77 + #ifndef MAXSSAMP
78 + #define MAXSSAMP        16              /* maximum samples per ray */
79 + #endif
80 +
81   /*
82   * Structures used by direct()
83   */
# Line 43 | Line 99 | static CNTPTR  *cntord;                        /* source ordering in direct
99   static int  maxcntr = 0;                /* size of contribution arrays */
100  
101  
102 + void
103   marksources()                   /* find and mark source objects */
104   {
105          int  foundsource = 0;
# Line 121 | Line 178 | memerr:
178   }
179  
180  
181 + void
182 + freesources()                   /* free all source structures */
183 + {
184 +        if (nsources > 0) {
185 +                free((void *)source);
186 +                source = NULL;
187 +                nsources = 0;
188 +        }
189 +        if (maxcntr <= 0)
190 +                return;
191 +        free((void *)srccnt);
192 +        srccnt = NULL;
193 +        free((void *)cntord);
194 +        cntord = NULL;
195 +        maxcntr = 0;
196 + }
197 +
198 +
199 + int
200   srcray(sr, r, si)               /* send a ray to a source, return domega */
201   register RAY  *sr;              /* returned source ray */
202   RAY  *r;                        /* ray which hit object */
# Line 158 | Line 234 | SRCINDEX  *si;                 /* source sample index */
234   }
235  
236  
237 + void
238   srcvalue(r)                     /* punch ray to source and compute value */
239   register RAY  *r;
240   {
# Line 198 | Line 275 | nomat:
275   }
276  
277  
278 + int
279   sourcehit(r)                    /* check to see if ray hit distant source */
280   register RAY  *r;
281   {
# Line 223 | Line 301 | register RAY  *r;
301                          }
302  
303          if (r->ro != NULL) {
304 +                r->robj = objndx(r->ro);
305                  for (i = 0; i < 3; i++)
306                          r->ron[i] = -r->rdir[i];
307                  r->rod = 1.0;
# Line 245 | Line 324 | register CNTPTR  *sc1, *sc2;
324   }
325  
326  
327 + void
328   direct(r, f, p)                         /* add direct component */
329   RAY  *r;                        /* ray that hit surface */
330 < int  (*f)();                    /* direct component coefficient function */
330 > void  (*f)();                   /* direct component coefficient function */
331   char  *p;                       /* data for f */
332   {
333 <        extern int  (*trace)();
333 >        extern void  (*trace)();
334          register int  sn;
335          register CONTRIB  *scp;
336          SRCINDEX  si;
# Line 333 | Line 413 | char  *p;                      /* data for f */
413                                  ( sr.ro != source[scp->sno].so ||
414                                  source[scp->sno].sflags & SFOLLOW )) {
415                                                  /* follow entire path */
416 <                        if (!raycont(&sr))
337 <                                objerror(sr.ro, USER, "material not found");
416 >                        raycont(&sr);
417                          rayparticipate(&sr);
418                          if (trace != NULL)
419                                  (*trace)(&sr);  /* trace execution */
# Line 371 | Line 450 | char  *p;                      /* data for f */
450   }
451  
452  
453 + void
454   srcscatter(r)                   /* compute source scattering into ray */
455   register RAY  *r;
456   {
# Line 378 | Line 458 | register RAY  *r;
458          int  nsamps;
459          RAY  sr;
460          SRCINDEX  si;
461 <        double  t, lastt, d;
462 <        COLOR  cumval, ctmp;
461 >        double  t, d;
462 >        double  re, ge, be;
463 >        COLOR  cvext;
464          int  i, j;
465  
466 <        if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY)
466 >        if (r->slights == NULL || r->slights[0] == 0
467 >                        || r->gecc >= 1.-FTINY || r->rot >= FHUGE)
468                  return;
469          if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1)
470                  nsamps = 1;
471 + #if MAXSSAMP
472 +        else if (nsamps > MAXSSAMP)
473 +                nsamps = MAXSSAMP;
474 + #endif
475          oldsampndx = samplendx;
476          samplendx = random()&0x7fff;            /* randomize */
391 –        initsrcindex(&si);
477          for (i = r->slights[0]; i > 0; i--) {   /* for each source */
478 <                setcolor(cumval, 0., 0., 0.);
394 <                lastt = r->rot;
395 <                for (j = nsamps; j-- > 0; ) {   /* for each sample position */
478 >                for (j = 0; j < nsamps; j++) {  /* for each sample position */
479                          samplendx++;
480                          t = r->rot * (j+frandom())/nsamps;
481 +                                                        /* extinction */
482 +                        re = t*colval(r->cext,RED);
483 +                        ge = t*colval(r->cext,GRN);
484 +                        be = t*colval(r->cext,BLU);
485 +                        setcolor(cvext, re > 92. ? 0. : exp(-re),
486 +                                        ge > 92. ? 0. : exp(-ge),
487 +                                        be > 92. ? 0. : exp(-be));
488 +                        if (intens(cvext) <= FTINY)
489 +                                break;                  /* too far away */
490                          sr.rorg[0] = r->rorg[0] + r->rdir[0]*t;
491                          sr.rorg[1] = r->rorg[1] + r->rdir[1]*t;
492                          sr.rorg[2] = r->rorg[2] + r->rdir[2]*t;
493                          sr.rmax = 0.;
494 <                                                /* sample ray to this source */
495 <                        if (si.sp >= si.np-1 || !srcray(&sr, NULL, &si) ||
496 <                                        sr.rsrc != r->slights[i]) {
497 <                                si.sn = r->slights[i]-1;        /* reset */
498 <                                si.np = 0;
499 <                                if (!srcray(&sr, NULL, &si) ||
408 <                                                sr.rsrc != r->slights[i])
409 <                                        continue;               /* no path */
410 <                        }
494 >                        initsrcindex(&si);      /* sample ray to this source */
495 >                        si.sn = r->slights[i];
496 >                        nopart(&si, &sr);
497 >                        if (!srcray(&sr, NULL, &si) ||
498 >                                        sr.rsrc != r->slights[i])
499 >                                continue;               /* no path */
500                          copycolor(sr.cext, r->cext);
501 <                        sr.albedo = r->albedo;
501 >                        copycolor(sr.albedo, r->albedo);
502                          sr.gecc = r->gecc;
503 +                        sr.slights = r->slights;
504                          rayvalue(&sr);                  /* eval. source ray */
505                          if (bright(sr.rcol) <= FTINY)
506                                  continue;
417 –                                                        /* compute fall-off */
418 –                        d = lastt - t;
419 –                        setcolor(ctmp,  1.-d*colval(r->cext,RED),
420 –                                        1.-d*colval(r->cext,GRN),
421 –                                        1.-d*colval(r->cext,BLU));
422 –                        multcolor(cumval, ctmp);
423 –                        lastt = t;
507                          if (r->gecc <= FTINY)           /* compute P(theta) */
508                                  d = 1.;
509                          else {
510                                  d = DOT(r->rdir, sr.rdir);
511 <                                d = sqrt(1. + r->gecc*r->gecc - 2.*r->gecc*d);
512 <                                d = (1. - r->gecc*r->gecc) / (d*d*d);
511 >                                d = 1. + r->gecc*r->gecc - 2.*r->gecc*d;
512 >                                d = (1. - r->gecc*r->gecc) / (d*sqrt(d));
513                          }
514                                                          /* other factors */
515 <                        d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps);
515 >                        d *= si.dom * r->rot / (4.*PI*nsamps);
516                          multcolor(sr.rcol, r->cext);
517 +                        multcolor(sr.rcol, r->albedo);
518                          scalecolor(sr.rcol, d);
519 <                        addcolor(cumval, sr.rcol);
519 >                        multcolor(sr.rcol, cvext);
520 >                        addcolor(r->rcol, sr.rcol);     /* add it in */
521                  }
437 –                                                /* final fall-off */
438 –                setcolor(ctmp,  1.-lastt*colval(r->cext,RED),
439 –                                1.-lastt*colval(r->cext,GRN),
440 –                                1.-lastt*colval(r->cext,BLU));
441 –                multcolor(cumval, ctmp);
442 –                addcolor(r->rcol, cumval);      /* sum into ray result */
522          }
523          samplendx = oldsampndx;
524   }
# Line 523 | Line 602 | return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);}
602                                  distglow(m, r, raydist(r,PRIMARY)))
603  
604  
605 + int
606   m_light(m, r)                   /* ray hit a light source */
607   register OBJREC  *m;
608   register RAY  *r;
# Line 535 | Line 615 | register RAY  *r;
615                                                  /* check for passed illum */
616          if (passillum(m, r)) {
617                  if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID))
618 <                        return(rayshade(r, modifier(m->oargs.sarg[0])));
618 >                        return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0])));
619                  raytrans(r);
620                  return(1);
621          }

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