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root/radiance/ray/src/rt/srcsupp.c
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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 2.4 by greg, Wed Feb 26 09:49:37 1992 UTC vs.
Revision 2.11 by greg, Wed Apr 23 00:52:34 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 + #include "copyright.h"
11 +
12   #include  "ray.h"
13  
14   #include  "otypes.h"
# Line 26 | Line 27 | int  nsources = 0;                     /* the number of sources */
27   SRCFUNC  sfun[NUMOTYPE];                /* source dispatch table */
28  
29  
30 + void
31   initstypes()                    /* initialize source dispatch table */
32   {
33          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();
34          static SOBJECT  fsobj = {fsetsrc, flatpart, fgetplaneq, fgetmaxdisk};
35          static SOBJECT  ssobj = {ssetsrc, nopart};
36          static SOBJECT  sphsobj = {sphsetsrc, nopart};
# Line 56 | Line 54 | newsource()                    /* allocate new source in our array */
54          if (nsources == 0)
55                  source = (SRCREC *)malloc(SRCINC*sizeof(SRCREC));
56          else if (nsources%SRCINC == 0)
57 <                source = (SRCREC *)realloc((char *)source,
57 >                source = (SRCREC *)realloc((void *)source,
58                                  (unsigned)(nsources+SRCINC)*sizeof(SRCREC));
59          if (source == NULL)
60                  return(-1);
# Line 67 | Line 65 | newsource()                    /* allocate new source in our array */
65   }
66  
67  
68 + void
69   setflatss(src)                          /* set sampling for a flat source */
70   register SRCREC  *src;
71   {
# Line 86 | Line 85 | register SRCREC  *src;
85   }
86  
87  
88 + void
89   fsetsrc(src, so)                        /* set a face as a source */
90   register SRCREC  *src;
91   OBJREC  *so;
# Line 119 | Line 119 | OBJREC  *so;
119          }
120          src->srad = sqrt(src->srad);
121                                                  /* compute size vectors */
122 <        if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123 <                        dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
122 >        if (f->nv == 4)                         /* parallelogram case */
123                  for (j = 0; j < 3; j++) {
124                          src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
125                          src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
# Line 130 | Line 129 | OBJREC  *so;
129   }
130  
131  
132 + void
133   ssetsrc(src, so)                        /* set a source as a source */
134   register SRCREC  *src;
135   register OBJREC  *so;
# Line 156 | Line 156 | register OBJREC  *so;
156   }
157  
158  
159 + void
160   sphsetsrc(src, so)                      /* set a sphere as a source */
161   register SRCREC  *src;
162   register OBJREC  *so;
# Line 178 | Line 179 | register OBJREC  *so;
179   }
180  
181  
182 + void
183   rsetsrc(src, so)                        /* set a ring (disk) as a source */
184   register SRCREC  *src;
185   OBJREC  *so;
# Line 199 | Line 201 | OBJREC  *so;
201   }
202  
203  
204 + void
205   cylsetsrc(src, so)                      /* set a cylinder as a source */
206   register SRCREC  *src;
207   OBJREC  *so;
# Line 239 | Line 242 | register OBJREC  *m;
242   {
243          register SPOT  *ns;
244  
245 +        if ((ns = (SPOT *)m->os) != NULL)
246 +                return(ns);
247          if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
248                  return(NULL);
249          ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
250          VCOPY(ns->aim, m->oargs.farg+4);
251          if ((ns->flen = normalize(ns->aim)) == 0.0)
252                  objerror(m, USER, "zero focus vector");
253 +        m->os = (char *)ns;
254          return(ns);
255   }
256  
257  
258 + int
259 + spotout(r, s)                   /* check if we're outside spot region */
260 + register RAY  *r;
261 + register SPOT  *s;
262 + {
263 +        double  d;
264 +        FVECT  vd;
265 +        
266 +        if (s == NULL)
267 +                return(0);
268 +        if (s->flen < -FTINY) {         /* distant source */
269 +                vd[0] = s->aim[0] - r->rorg[0];
270 +                vd[1] = s->aim[1] - r->rorg[1];
271 +                vd[2] = s->aim[2] - r->rorg[2];
272 +                d = DOT(r->rdir,vd);
273 +                /*                      wrong side?
274 +                if (d <= FTINY)
275 +                        return(1);      */
276 +                d = DOT(vd,vd) - d*d;
277 +                if (PI*d > s->siz)
278 +                        return(1);      /* out */
279 +                return(0);      /* OK */
280 +        }
281 +                                        /* local source */
282 +        if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
283 +                return(1);      /* out */
284 +        return(0);      /* OK */
285 + }
286 +
287 +
288   double
289   fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
290   FVECT  ocent;
# Line 320 | Line 356 | OBJREC  *op;
356   }
357  
358  
359 + int
360   commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
361   register SPOT  *sp1, *sp2;
362   FVECT  org;
# Line 343 | Line 380 | FVECT  org;
380   }
381  
382  
383 + int
384   commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
385   register SPOT  *sp1, *sp2;
386   FVECT  dir;
# Line 367 | Line 405 | FVECT  dir;
405   }
406  
407  
408 + int
409   checkspot(sp, nrm)              /* check spotlight for behind source */
410   register SPOT  *sp;     /* spotlight */
411   FVECT  nrm;             /* source surface normal */
# Line 462 | Line 501 | double  r1s, r2s;              /* radii squared */
501          for (i = 0; i < 3; i++)
502                  cc[i] = c1[i] + l*disp[i];
503          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 – /* distglow *
530 – *
531 – * A distant glow is an object that sometimes acts as a light source,
532 – * but is too far away from the test point to be one in this case.
533 – */
534 –
535 – #define  distglow(m, r)         (m->otype==MAT_GLOW && \
536 –                                r->rot > m->oargs.farg[3])
537 –
538 – /* badcomponent *
539 – *
540 – * We must avoid counting light sources in the ambient calculation,
541 – * since the direct component is handled separately.  Therefore, any
542 – * ambient ray which hits an active light source must be discarded.
543 – * The same is true for stray specular samples, since the specular
544 – * contribution from light sources is calculated separately.
545 – */
546 –
547 – #define  badcomponent(m, r)     (r->crtype&(AMBIENT|SPECULAR) && \
548 –                                !(r->crtype&SHADOW || r->rod < 0.0 || \
549 –                                        distglow(m, r)))
550 –
551 – /* overcount *
552 – *
553 – * All overcounting possibilities are contained here.
554 – */
555 –
556 – #define  overcount(m, r)        (badcomponent(m,r) || wrongsource(m,r))
557 –
558 – /* passillum *
559 – *
560 – * An illum passes to another material type when we didn't hit it
561 – * on purpose (as part of a direct calculation), or it is relaying
562 – * a virtual light source.
563 – */
564 –
565 – #define  passillum(m, r)        (m->otype==MAT_ILLUM && \
566 –                                (r->rsrc<0 || source[r->rsrc].so!=r->ro || \
567 –                                source[r->rsrc].sflags&SVIRTUAL))
568 –
569 – /* srcignore *
570 – *
571 – * The -di flag renders light sources invisible, and here is the test.
572 – */
573 –
574 – #define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
575 –                                !distglow(m, r))
576 –
577 –
578 – m_light(m, r)                   /* ray hit a light source */
579 – register OBJREC  *m;
580 – register RAY  *r;
581 – {
582 –                                                /* check for over-counting */
583 –        if (overcount(m, r))
584 –                return;
585 –                                                /* check for passed illum */
586 –        if (passillum(m, r)) {
587 –                if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
588 –                        raytrans(r);
589 –                else
590 –                        rayshade(r, modifier(m->oargs.sarg[0]));
591 –                return;
592 –        }
593 –                                        /* otherwise treat as source */
594 –                                                /* check for behind */
595 –        if (r->rod < 0.0)
596 –                return;
597 –                                                /* check for invisibility */
598 –        if (srcignore(m, r))
599 –                return;
600 –                                                /* get distribution pattern */
601 –        raytexture(r, m->omod);
602 –                                                /* get source color */
603 –        setcolor(r->rcol, m->oargs.farg[0],
604 –                          m->oargs.farg[1],
605 –                          m->oargs.farg[2]);
606 –                                                /* modify value */
607 –        multcolor(r->rcol, r->pcol);
504   }

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