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Comparing ray/src/rt/source.c (file contents):
Revision 2.17 by greg, Thu Nov 2 17:37:58 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"
72  
73 + #include  "random.h"
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 39 | 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 117 | 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 131 | Line 211 | SRCINDEX  *si;                 /* source sample index */
211          sr->rsrc = si->sn;                      /* remember source */
212          srcp = source + si->sn;
213          if (srcp->sflags & SDISTANT) {
214 <                if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1))
214 >                if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s))
215                          continue;
216                  return(1);              /* sample OK */
217          }
# Line 141 | Line 221 | SRCINDEX  *si;                 /* source sample index */
221                  continue;
222                                                  /* check angle */
223          if (srcp->sflags & SSPOT) {
224 <                if (spotout(sr, srcp->sl.s, 0))
224 >                if (spotout(sr, srcp->sl.s))
225                          continue;
226                                          /* adjust solid angle */
227                  si->dom *= d*d;
# Line 154 | 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 166 | Line 247 | register RAY  *r;
247                          return;
248                  if (!rayshade(r, r->ro->omod))  /* compute contribution */
249                          goto nomat;
250 +                rayparticipate(r);
251                  return;
252          }
253                                          /* compute intersection */
# Line 175 | Line 257 | register RAY  *r;
257                          sp->sa.success++;
258                  if (!rayshade(r, r->ro->omod))  /* compute contribution */
259                          goto nomat;
260 +                rayparticipate(r);
261                  return;
262          }
263                                          /* we missed our mark! */
# Line 192 | 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 217 | 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 239 | 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 327 | 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))
417 <                                objerror(sr.ro, USER, "material not found");
416 >                        raycont(&sr);
417 >                        rayparticipate(&sr);
418                          if (trace != NULL)
419                                  (*trace)(&sr);  /* trace execution */
420                          if (bright(sr.rcol) <= FTINY)
# Line 364 | 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 + {
457 +        int  oldsampndx;
458 +        int  nsamps;
459 +        RAY  sr;
460 +        SRCINDEX  si;
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
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 */
477 +        for (i = r->slights[0]; i > 0; i--) {   /* for each source */
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 +                        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 +                        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;
507 +                        if (r->gecc <= FTINY)           /* compute P(theta) */
508 +                                d = 1.;
509 +                        else {
510 +                                d = DOT(r->rdir, sr.rdir);
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->rot / (4.*PI*nsamps);
516 +                        multcolor(sr.rcol, r->cext);
517 +                        multcolor(sr.rcol, r->albedo);
518 +                        scalecolor(sr.rcol, d);
519 +                        multcolor(sr.rcol, cvext);
520 +                        addcolor(r->rcol, sr.rcol);     /* add it in */
521 +                }
522 +        }
523 +        samplendx = oldsampndx;
524 + }
525 +
526 +
527   /****************************************************************
528   * The following macros were separated from the m_light() routine
529   * because they are very nasty and difficult to understand.
# Line 442 | 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 454 | 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          }
# Line 466 | Line 627 | register RAY  *r;
627          if (srcignore(m, r))
628                  return(1);
629                                                  /* check for outside spot */
630 <        if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE))
630 >        if (m->otype==MAT_SPOT && spotout(r, makespot(m)))
631                  return(1);
632                                                  /* get distribution pattern */
633          raytexture(r, m->omod);

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