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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 2.2 by greg, Sat Jan 4 19:54:20 1992 UTC vs.
Revision 2.9 by greg, Sat Feb 22 02:07:29 2003 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1992 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   *  Support routines for source objects and materials
6 + *
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  
69   #include  "otypes.h"
# Line 26 | Line 82 | int  nsources = 0;                     /* the number of sources */
82   SRCFUNC  sfun[NUMOTYPE];                /* source dispatch table */
83  
84  
85 + void
86   initstypes()                    /* initialize source dispatch table */
87   {
88          extern VSMATERIAL  mirror_vs, direct1_vs, direct2_vs;
32 –        extern int  fsetsrc(), ssetsrc(), sphsetsrc(), cylsetsrc(), rsetsrc();
33 –        extern int  nopart(), flatpart(), cylpart();
34 –        extern double  fgetplaneq(), rgetplaneq();
35 –        extern double  fgetmaxdisk(), rgetmaxdisk();
89          static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
90          static SOBJECT  ssobj = {ssetsrc, nopart};
91          static SOBJECT  sphsobj = {sphsetsrc, nopart};
# Line 67 | Line 120 | newsource()                    /* allocate new source in our array */
120   }
121  
122  
123 + void
124   setflatss(src)                          /* set sampling for a flat source */
125   register SRCREC  *src;
126   {
# Line 86 | Line 140 | register SRCREC  *src;
140   }
141  
142  
143 + void
144   fsetsrc(src, so)                        /* set a face as a source */
145   register SRCREC  *src;
146   OBJREC  *so;
# Line 119 | Line 174 | OBJREC  *so;
174          }
175          src->srad = sqrt(src->srad);
176                                                  /* compute size vectors */
177 <        if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123 <                        dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
177 >        if (f->nv == 4)                         /* parallelogram case */
178                  for (j = 0; j < 3; j++) {
179                          src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
180                          src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
# Line 130 | Line 184 | OBJREC  *so;
184   }
185  
186  
187 + void
188   ssetsrc(src, so)                        /* set a source as a source */
189   register SRCREC  *src;
190   register OBJREC  *so;
# Line 156 | Line 211 | register OBJREC  *so;
211   }
212  
213  
214 + void
215   sphsetsrc(src, so)                      /* set a sphere as a source */
216   register SRCREC  *src;
217   register OBJREC  *so;
# Line 178 | Line 234 | register OBJREC  *so;
234   }
235  
236  
237 + void
238   rsetsrc(src, so)                        /* set a ring (disk) as a source */
239   register SRCREC  *src;
240   OBJREC  *so;
# Line 199 | Line 256 | OBJREC  *so;
256   }
257  
258  
259 + void
260   cylsetsrc(src, so)                      /* set a cylinder as a source */
261   register SRCREC  *src;
262   OBJREC  *so;
# Line 239 | Line 297 | register OBJREC  *m;
297   {
298          register SPOT  *ns;
299  
300 +        if ((ns = (SPOT *)m->os) != NULL)
301 +                return(ns);
302          if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
303                  return(NULL);
304          ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
305          VCOPY(ns->aim, m->oargs.farg+4);
306          if ((ns->flen = normalize(ns->aim)) == 0.0)
307                  objerror(m, USER, "zero focus vector");
308 +        m->os = (char *)ns;
309          return(ns);
310   }
311  
312  
313 + int
314 + spotout(r, s)                   /* check if we're outside spot region */
315 + register RAY  *r;
316 + register SPOT  *s;
317 + {
318 +        double  d;
319 +        FVECT  vd;
320 +        
321 +        if (s == NULL)
322 +                return(0);
323 +        if (s->flen < -FTINY) {         /* distant source */
324 +                vd[0] = s->aim[0] - r->rorg[0];
325 +                vd[1] = s->aim[1] - r->rorg[1];
326 +                vd[2] = s->aim[2] - r->rorg[2];
327 +                d = DOT(r->rdir,vd);
328 +                /*                      wrong side?
329 +                if (d <= FTINY)
330 +                        return(1);      */
331 +                d = DOT(vd,vd) - d*d;
332 +                if (PI*d > s->siz)
333 +                        return(1);      /* out */
334 +                return(0);      /* OK */
335 +        }
336 +                                        /* local source */
337 +        if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
338 +                return(1);      /* out */
339 +        return(0);      /* OK */
340 + }
341 +
342 +
343   double
344   fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
345   FVECT  ocent;
# Line 320 | Line 411 | OBJREC  *op;
411   }
412  
413  
414 + int
415   commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
416   register SPOT  *sp1, *sp2;
417   FVECT  org;
# Line 343 | Line 435 | FVECT  org;
435   }
436  
437  
438 + int
439   commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
440   register SPOT  *sp1, *sp2;
441   FVECT  dir;
# Line 367 | Line 460 | FVECT  dir;
460   }
461  
462  
463 + int
464   checkspot(sp, nrm)              /* check spotlight for behind source */
465   register SPOT  *sp;     /* spotlight */
466   FVECT  nrm;             /* source surface normal */
# Line 462 | Line 556 | double  r1s, r2s;              /* radii squared */
556          for (i = 0; i < 3; i++)
557                  cc[i] = c1[i] + l*disp[i];
558          return(a2);
465 – }
466 –
467 –
468 – sourcehit(r)                    /* check to see if ray hit distant source */
469 – register RAY  *r;
470 – {
471 –        int  first, last;
472 –        register int  i;
473 –
474 –        if (r->rsrc >= 0) {             /* check only one if aimed */
475 –                first = last = r->rsrc;
476 –        } else {                        /* otherwise check all */
477 –                first = 0; last = nsources-1;
478 –        }
479 –        for (i = first; i <= last; i++)
480 –                if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT)
481 –                        /*
482 –                         * Check to see if ray is within
483 –                         * solid angle of source.
484 –                         */
485 –                        if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir))
486 –                                        <= source[i].ss2) {
487 –                                r->ro = source[i].so;
488 –                                if (!(source[i].sflags & SSKIP))
489 –                                        break;
490 –                        }
491 –
492 –        if (r->ro != NULL) {
493 –                for (i = 0; i < 3; i++)
494 –                        r->ron[i] = -r->rdir[i];
495 –                r->rod = 1.0;
496 –                r->rox = NULL;
497 –                return(1);
498 –        }
499 –        return(0);
500 – }
501 –
502 –
503 – /****************************************************************
504 – * The following macros were separated from the m_light() routine
505 – * because they are very nasty and difficult to understand.
506 – */
507 –
508 – /* wrongillum *
509 – *
510 – * We cannot allow an illum to pass to another illum, because that
511 – * would almost certainly constitute overcounting.
512 – * However, we do allow an illum to pass to another illum
513 – * that is actually going to relay to a virtual light source.
514 – */
515 –
516 – #define  wrongillum(m, r)       (!(source[r->rsrc].sflags&SVIRTUAL) && \
517 –                        objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM)
518 –
519 – /* wrongsource *
520 – *
521 – * This source is the wrong source (ie. overcounted) if we are
522 – * aimed to a different source than the one we hit and the one
523 – * we hit is not an illum which should be passed.
524 – */
525 –
526 – #define  wrongsource(m, r)      (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \
527 –                                (m->otype!=MAT_ILLUM || wrongillum(m,r)))
528 –
529 – /* badspecular *
530 – *
531 – * Any undirected specular ray that hits a light source
532 – * should be discarded.  This is because the source contribution to
533 – * specular components is calculated separately to reduce variance.
534 – */
535 –
536 – #define  badspecular(m, r)      (r->rsrc<0 && r->crtype&SPECULAR)
537 –
538 – /* distglow *
539 – *
540 – * A distant glow is an object that sometimes acts as a light source,
541 – * but is too far away from the test point to be one in this case.
542 – */
543 –
544 – #define  distglow(m, r)         (m->otype==MAT_GLOW && \
545 –                                r->rot > m->oargs.farg[3])
546 –
547 – /* badambient *
548 – *
549 – * We must avoid including counting light sources in the ambient calculation,
550 – * since the direct component is handled separately.  Therefore, any
551 – * ambient ray which hits an active light source must be discarded.
552 – */
553 –
554 – #define  badambient(m, r)       ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \
555 –                                !distglow(m, r))
556 –
557 – /* overcount *
558 – *
559 – * All overcounting possibilities are contained here.
560 – */
561 –
562 – #define  overcount(m, r)        (badspecular(m,r) || wrongsource(m,r) || \
563 –                                badambient(m,r))
564 –
565 – /* passillum *
566 – *
567 – * An illum passes to another material type when we didn't hit it
568 – * on purpose (as part of a direct calculation), or it is relaying
569 – * a virtual light source.
570 – */
571 –
572 – #define  passillum(m, r)        (m->otype==MAT_ILLUM && \
573 –                                (r->rsrc<0 || source[r->rsrc].so!=r->ro || \
574 –                                source[r->rsrc].sflags&SVIRTUAL))
575 –
576 – /* srcignore *
577 – *
578 – * The -di flag renders light sources invisible, and here is the test.
579 – */
580 –
581 – #define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
582 –                                !distglow(m, r))
583 –
584 –
585 – m_light(m, r)                   /* ray hit a light source */
586 – register OBJREC  *m;
587 – register RAY  *r;
588 – {
589 –                                                /* check for over-counting */
590 –        if (overcount(m, r))
591 –                return;
592 –                                                /* check for passed illum */
593 –        if (passillum(m, r)) {
594 –                if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
595 –                        raytrans(r);
596 –                else
597 –                        rayshade(r, modifier(m->oargs.sarg[0]));
598 –                return;
599 –        }
600 –                                        /* otherwise treat as source */
601 –                                                /* check for behind */
602 –        if (r->rod < 0.0)
603 –                return;
604 –                                                /* check for invisibility */
605 –        if (srcignore(m, r))
606 –                return;
607 –                                                /* get distribution pattern */
608 –        raytexture(r, m->omod);
609 –                                                /* get source color */
610 –        setcolor(r->rcol, m->oargs.farg[0],
611 –                          m->oargs.farg[1],
612 –                          m->oargs.farg[2]);
613 –                                                /* modify value */
614 –        multcolor(r->rcol, r->pcol);
559   }

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