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root/radiance/ray/src/rt/srcsupp.c
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Comparing ray/src/rt/srcsupp.c (file contents):
Revision 2.1 by greg, Tue Nov 12 17:10:22 1991 UTC vs.
Revision 2.17 by greg, Sat Dec 6 01:08:53 2008 UTC

# Line 1 | Line 1
1 – /* Copyright (c) 1991 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 18 | Line 19 | static char SCCSid[] = "$SunId$ LBL";
19  
20   #include  "face.h"
21  
22 < #define SRCINC          4               /* realloc increment for array */
22 > #define SRCINC          8               /* realloc increment for array */
23  
24   SRCREC  *source = NULL;                 /* our list of sources */
25   int  nsources = 0;                      /* the number of sources */
# 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);
61          source[nsources].sflags = 0;
62          source[nsources].nhits = 1;
63 <        source[nsources].ntests = 2;    /* initial hit probability = 1/2 */
63 >        source[nsources].ntests = 2;    /* initial hit probability = 50% */
64 > #if SHADCACHE
65 >        source[nsources].obscache = NULL;
66 > #endif
67          return(nsources++);
68   }
69  
70  
71 + void
72   setflatss(src)                          /* set sampling for a flat source */
73   register SRCREC  *src;
74   {
# Line 86 | Line 88 | register SRCREC  *src;
88   }
89  
90  
91 + void
92   fsetsrc(src, so)                        /* set a face as a source */
93   register SRCREC  *src;
94   OBJREC  *so;
# Line 98 | Line 101 | OBJREC  *so;
101          src->so = so;
102                                                  /* get the face */
103          f = getface(so);
104 +        if (f->area == 0.0)
105 +                objerror(so, USER, "zero source area");
106                                                  /* find the center */
107          for (j = 0; j < 3; j++) {
108                  src->sloc[j] = 0.0;
# Line 106 | Line 111 | OBJREC  *so;
111                  src->sloc[j] /= (double)f->nv;
112          }
113          if (!inface(src->sloc, f))
114 <                objerror(so, USER, "cannot hit center");
114 >                objerror(so, USER, "cannot hit source center");
115          src->sflags |= SFLAT;
116          VCOPY(src->snorm, f->norm);
117          src->ss2 = f->area;
# Line 119 | Line 124 | OBJREC  *so;
124          }
125          src->srad = sqrt(src->srad);
126                                                  /* compute size vectors */
127 <        if (f->nv == 4 || (f->nv == 5 &&        /* parallelogram case */
123 <                        dist2(VERTEX(f,0),VERTEX(f,4)) <= FTINY*FTINY))
127 >        if (f->nv == 4)                         /* parallelogram case */
128                  for (j = 0; j < 3; j++) {
129                          src->ss[SU][j] = .5*(VERTEX(f,1)[j]-VERTEX(f,0)[j]);
130                          src->ss[SV][j] = .5*(VERTEX(f,3)[j]-VERTEX(f,0)[j]);
# Line 130 | Line 134 | OBJREC  *so;
134   }
135  
136  
137 + void
138   ssetsrc(src, so)                        /* set a source as a source */
139   register SRCREC  *src;
140   register OBJREC  *so;
# Line 140 | Line 145 | register OBJREC  *so;
145          src->so = so;
146          if (so->oargs.nfargs != 4)
147                  objerror(so, USER, "bad arguments");
148 <        src->sflags |= SDISTANT;
148 >        src->sflags |= (SDISTANT|SCIR);
149          VCOPY(src->sloc, so->oargs.farg);
150          if (normalize(src->sloc) == 0.0)
151                  objerror(so, USER, "zero direction");
# Line 156 | Line 161 | register OBJREC  *so;
161   }
162  
163  
164 + void
165   sphsetsrc(src, so)                      /* set a sphere as a source */
166   register SRCREC  *src;
167   register OBJREC  *so;
# Line 167 | Line 173 | register OBJREC  *so;
173          if (so->oargs.nfargs != 4)
174                  objerror(so, USER, "bad # arguments");
175          if (so->oargs.farg[3] <= FTINY)
176 <                objerror(so, USER, "illegal radius");
176 >                objerror(so, USER, "illegal source radius");
177 >        src->sflags |= SCIR;
178          VCOPY(src->sloc, so->oargs.farg);
179          src->srad = so->oargs.farg[3];
180          src->ss2 = PI * src->srad * src->srad;
181          for (i = 0; i < 3; i++)
182                  src->ss[SU][i] = src->ss[SV][i] = src->ss[SW][i] = 0.0;
183          for (i = 0; i < 3; i++)
184 <                src->ss[i][i] = .7236 * so->oargs.farg[3];
184 >                src->ss[i][i] = 0.7236 * so->oargs.farg[3];
185   }
186  
187  
188 + void
189   rsetsrc(src, so)                        /* set a ring (disk) as a source */
190   register SRCREC  *src;
191   OBJREC  *so;
# Line 188 | Line 196 | OBJREC  *so;
196          src->so = so;
197                                                  /* get the ring */
198          co = getcone(so, 0);
199 +        if (CO_R1(co) <= FTINY)
200 +                objerror(so, USER, "illegal source radius");
201          VCOPY(src->sloc, CO_P0(co));
202          if (CO_R0(co) > 0.0)
203 <                objerror(so, USER, "cannot hit center");
204 <        src->sflags |= SFLAT;
203 >                objerror(so, USER, "cannot hit source center");
204 >        src->sflags |= (SFLAT|SCIR);
205          VCOPY(src->snorm, co->ad);
206          src->srad = CO_R1(co);
207          src->ss2 = PI * src->srad * src->srad;
# Line 199 | Line 209 | OBJREC  *so;
209   }
210  
211  
212 + void
213   cylsetsrc(src, so)                      /* set a cylinder as a source */
214   register SRCREC  *src;
215   OBJREC  *so;
# Line 210 | Line 221 | OBJREC  *so;
221          src->so = so;
222                                                  /* get the cylinder */
223          co = getcone(so, 0);
224 +        if (CO_R0(co) <= FTINY)
225 +                objerror(so, USER, "illegal source radius");
226          if (CO_R0(co) > .2*co->al)              /* heuristic constraint */
227                  objerror(so, WARNING, "source aspect too small");
228          src->sflags |= SCYL;
# Line 239 | Line 252 | register OBJREC  *m;
252   {
253          register SPOT  *ns;
254  
255 +        if ((ns = (SPOT *)m->os) != NULL)
256 +                return(ns);
257          if ((ns = (SPOT *)malloc(sizeof(SPOT))) == NULL)
258                  return(NULL);
259 +        if (m->oargs.farg[3] <= FTINY)
260 +                objerror(m, USER, "zero angle");
261          ns->siz = 2.0*PI * (1.0 - cos(PI/180.0/2.0 * m->oargs.farg[3]));
262          VCOPY(ns->aim, m->oargs.farg+4);
263          if ((ns->flen = normalize(ns->aim)) == 0.0)
264                  objerror(m, USER, "zero focus vector");
265 +        m->os = (char *)ns;
266          return(ns);
267   }
268  
269  
270 + int
271 + spotout(r, s)                   /* check if we're outside spot region */
272 + register RAY  *r;
273 + register SPOT  *s;
274 + {
275 +        double  d;
276 +        FVECT  vd;
277 +        
278 +        if (s == NULL)
279 +                return(0);
280 +        if (s->flen < -FTINY) {         /* distant source */
281 +                vd[0] = s->aim[0] - r->rorg[0];
282 +                vd[1] = s->aim[1] - r->rorg[1];
283 +                vd[2] = s->aim[2] - r->rorg[2];
284 +                d = DOT(r->rdir,vd);
285 +                /*                      wrong side?
286 +                if (d <= FTINY)
287 +                        return(1);      */
288 +                d = DOT(vd,vd) - d*d;
289 +                if (PI*d > s->siz)
290 +                        return(1);      /* out */
291 +                return(0);      /* OK */
292 +        }
293 +                                        /* local source */
294 +        if (s->siz < 2.0*PI * (1.0 + DOT(s->aim,r->rdir)))
295 +                return(1);      /* out */
296 +        return(0);      /* OK */
297 + }
298 +
299 +
300   double
301   fgetmaxdisk(ocent, op)          /* get center and squared radius of face */
302   FVECT  ocent;
# Line 320 | Line 368 | OBJREC  *op;
368   }
369  
370  
371 + int
372   commonspot(sp1, sp2, org)       /* set sp1 to intersection of sp1 and sp2 */
373   register SPOT  *sp1, *sp2;
374   FVECT  org;
# Line 343 | Line 392 | FVECT  org;
392   }
393  
394  
395 + int
396   commonbeam(sp1, sp2, dir)       /* set sp1 to intersection of sp1 and sp2 */
397   register SPOT  *sp1, *sp2;
398   FVECT  dir;
# Line 367 | Line 417 | FVECT  dir;
417   }
418  
419  
420 + int
421   checkspot(sp, nrm)              /* check spotlight for behind source */
422   register SPOT  *sp;     /* spotlight */
423   FVECT  nrm;             /* source surface normal */
# Line 462 | Line 513 | double  r1s, r2s;              /* radii squared */
513          for (i = 0; i < 3; i++)
514                  cc[i] = c1[i] + l*disp[i];
515          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 – /* badambient *
539 – *
540 – * We must avoid including 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 – */
544 –
545 – #define  badambient(m, r)       ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \
546 –                                !distglow(m, r))
547 –
548 – /* passillum *
549 – *
550 – * An illum passes to another material type when we didn't hit it
551 – * on purpose (as part of a direct calculation), or it is relaying
552 – * a virtual light source.
553 – */
554 –
555 – #define  passillum(m, r)        (m->otype==MAT_ILLUM && \
556 –                                (r->rsrc<0 || source[r->rsrc].so!=r->ro || \
557 –                                source[r->rsrc].sflags&SVIRTUAL))
558 –
559 – /* srcignore *
560 – *
561 – * The -di flag renders light sources invisible, and here is the test.
562 – */
563 –
564 – #define  srcignore(m, r)        (directinvis && !(r->crtype&SHADOW) && \
565 –                                !distglow(m, r))
566 –
567 –
568 – m_light(m, r)                   /* ray hit a light source */
569 – register OBJREC  *m;
570 – register RAY  *r;
571 – {
572 –                                                /* check for over-counting */
573 –        if (wrongsource(m, r) || badambient(m, r))
574 –                return;
575 –                                                /* check for passed illum */
576 –        if (passillum(m, r)) {
577 –                if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID))
578 –                        raytrans(r);
579 –                else
580 –                        rayshade(r, modifier(m->oargs.sarg[0]));
581 –                return;
582 –        }
583 –                                        /* otherwise treat as source */
584 –                                                /* check for behind */
585 –        if (r->rod < 0.0)
586 –                return;
587 –                                                /* check for invisibility */
588 –        if (srcignore(m, r))
589 –                return;
590 –                                                /* get distribution pattern */
591 –        raytexture(r, m->omod);
592 –                                                /* get source color */
593 –        setcolor(r->rcol, m->oargs.farg[0],
594 –                          m->oargs.farg[1],
595 –                          m->oargs.farg[2]);
596 –                                                /* modify value */
597 –        multcolor(r->rcol, r->pcol);
516   }

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