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Comparing ray/src/rt/raytrace.c (file contents):
Revision 2.34 by greg, Sat Feb 22 02:07:29 2003 UTC vs.
Revision 2.50 by greg, Thu May 26 06:55:22 2005 UTC

# Line 1 | Line 1
1   #ifndef lint
2 < static const char       RCSid[] = "$Id$";
2 > static const char RCSid[] = "$Id$";
3   #endif
4   /*
5   *  raytrace.c - routines for tracing and shading rays.
# Line 7 | Line 7 | static const char      RCSid[] = "$Id$";
7   *  External symbols declared in ray.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 < */
10 > #include "copyright.h"
11  
12   #include  "ray.h"
13 <
13 > #include  "source.h"
14   #include  "otypes.h"
70 –
15   #include  "otspecial.h"
16  
17   #define  MAXCSET        ((MAXSET+1)*2-1)        /* maximum check set size */
# Line 75 | Line 19 | static const char      RCSid[] = "$Id$";
19   unsigned long  raynum = 0;              /* next unique ray number */
20   unsigned long  nrays = 0;               /* number of calls to localhit */
21  
22 < static FLOAT  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
22 > static RREAL  Lambfa[5] = {PI, PI, PI, 0.0, 0.0};
23   OBJREC  Lamb = {
24          OVOID, MAT_PLASTIC, "Lambertian",
25          {0, 5, NULL, Lambfa}, NULL,
# Line 83 | Line 27 | OBJREC  Lamb = {
27  
28   OBJREC  Aftplane;                       /* aft clipping plane object */
29  
86 – static int  raymove(), checkhit();
87 – static void  checkset();
88 –
89 – #ifndef  MAXLOOP
90 – #define  MAXLOOP        0               /* modifier loop detection */
91 – #endif
92 –
30   #define  RAYHIT         (-1)            /* return value for intercepted ray */
31  
32 + static int raymove(FVECT  pos, OBJECT  *cxs, int  dirf, RAY  *r, CUBE  *cu);
33 + static int checkhit(RAY  *r, CUBE  *cu, OBJECT  *cxs);
34 + static void checkset(OBJECT  *os, OBJECT  *cs);
35  
96 – int
97 – rayorigin(r, ro, rt, rw)                /* start new ray from old one */
98 – register RAY  *r, *ro;
99 – int  rt;
100 – double  rw;
101 – {
102 –        double  re;
36  
37 + extern int
38 + rayorigin(              /* start new ray from old one */
39 +        RAY  *r,
40 +        int  rt,
41 +        const RAY  *ro,
42 +        const COLOR rc
43 + )
44 + {
45 +        double  rw, re;
46 +                                                /* assign coefficient/weight */
47 +        if (rc == NULL) {
48 +                rw = 1.0;
49 +                setcolor(r->rcoef, 1., 1., 1.);
50 +        } else {
51 +                rw = intens(rc);
52 +                if (rc != r->rcoef)
53 +                        copycolor(r->rcoef, rc);
54 +        }
55          if ((r->parent = ro) == NULL) {         /* primary ray */
56                  r->rlvl = 0;
57                  r->rweight = rw;
# Line 113 | Line 64 | double  rw;
64                  r->gecc = seccg;
65                  r->slights = NULL;
66          } else {                                /* spawned ray */
67 +                if (ro->rot >= FHUGE) {
68 +                        memset(r, 0, sizeof(RAY));
69 +                        return(-1);             /* illegal continuation */
70 +                }
71                  r->rlvl = ro->rlvl;
72                  if (rt & RAYREFL) {
73                          r->rlvl++;
# Line 132 | Line 87 | double  rw;
87                  r->crtype = ro->crtype | (r->rtype = rt);
88                  VCOPY(r->rorg, ro->rop);
89                  r->rweight = ro->rweight * rw;
90 <                                                /* estimate absorption */
90 >                                                /* estimate extinction */
91                  re = colval(ro->cext,RED) < colval(ro->cext,GRN) ?
92                                  colval(ro->cext,RED) : colval(ro->cext,GRN);
93                  if (colval(ro->cext,BLU) < re) re = colval(ro->cext,BLU);
94 <                if (re > 0.)
95 <                        r->rweight *= exp(-re*ro->rot);
94 >                re *= ro->rot;
95 >                if (re > .1)
96 >                        r->rweight *= exp(-re);
97          }
98          rayclear(r);
99          return(r->rlvl <= maxdepth && r->rweight >= minweight ? 0 : -1);
100   }
101  
102  
103 < void
104 < rayclear(r)                     /* clear a ray for (re)evaluation */
105 < register RAY  *r;
103 > extern void
104 > rayclear(                       /* clear a ray for (re)evaluation */
105 >        register RAY  *r
106 > )
107   {
108          r->rno = raynum++;
109          r->newcset = r->clipset;
110 +        r->hitf = rayhit;
111          r->robj = OVOID;
112          r->ro = NULL;
113          r->rox = NULL;
114          r->rt = r->rot = FHUGE;
115          r->pert[0] = r->pert[1] = r->pert[2] = 0.0;
116 +        r->uv[0] = r->uv[1] = 0.0;
117          setcolor(r->pcol, 1.0, 1.0, 1.0);
118          setcolor(r->rcol, 0.0, 0.0, 0.0);
119   }
120  
121  
122 < void
123 < raytrace(r)                     /* trace a ray and compute its value */
124 < RAY  *r;
122 > extern void
123 > raytrace(                       /* trace a ray and compute its value */
124 >        RAY  *r
125 > )
126   {
127          if (localhit(r, &thescene))
128                  raycont(r);             /* hit local surface, evaluate */
# Line 172 | Line 132 | RAY  *r;
132          } else if (sourcehit(r))
133                  rayshade(r, r->ro->omod);       /* distant source */
134  
175 –        rayparticipate(r);              /* for participating medium */
176 –
135          if (trace != NULL)
136                  (*trace)(r);            /* trace execution */
137 +
138 +        rayparticipate(r);              /* for participating medium */
139   }
140  
141  
142 < void
143 < raycont(r)                      /* check for clipped object and continue */
144 < register RAY  *r;
142 > extern void
143 > raycont(                        /* check for clipped object and continue */
144 >        register RAY  *r
145 > )
146   {
147          if ((r->clipset != NULL && inset(r->clipset, r->ro->omod)) ||
148                          !rayshade(r, r->ro->omod))
# Line 189 | Line 150 | register RAY  *r;
150   }
151  
152  
153 < void
154 < raytrans(r)                     /* transmit ray as is */
155 < register RAY  *r;
153 > extern void
154 > raytrans(                       /* transmit ray as is */
155 >        register RAY  *r
156 > )
157   {
158          RAY  tr;
159  
160 <        if (rayorigin(&tr, r, TRANS, 1.0) == 0) {
160 >        if (rayorigin(&tr, TRANS, r, NULL) == 0) {
161                  VCOPY(tr.rdir, r->rdir);
162                  rayvalue(&tr);
163                  copycolor(r->rcol, tr.rcol);
# Line 204 | Line 166 | register RAY  *r;
166   }
167  
168  
169 < int
170 < rayshade(r, mod)                /* shade ray r with material mod */
171 < register RAY  *r;
172 < int  mod;
169 > extern int
170 > rayshade(               /* shade ray r with material mod */
171 >        register RAY  *r,
172 >        int  mod
173 > )
174   {
212 –        int  gotmat;
175          register OBJREC  *m;
176 < #if  MAXLOOP
215 <        static int  depth = 0;
216 <                                        /* check for infinite loop */
217 <        if (depth++ >= MAXLOOP)
218 <                objerror(r->ro, USER, "possible modifier loop");
219 < #endif
176 >
177          r->rt = r->rot;                 /* set effective ray length */
178 <        for (gotmat = 0; !gotmat && mod != OVOID; mod = m->omod) {
178 >        for ( ; mod != OVOID; mod = m->omod) {
179                  m = objptr(mod);
180                  /****** unnecessary test since modifier() is always called
181                  if (!ismodifier(m->otype)) {
# Line 227 | Line 184 | int  mod;
184                  }
185                  ******/
186                                          /* hack for irradiance calculation */
187 <                if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS))) {
187 >                if (do_irrad && !(r->crtype & ~(PRIMARY|TRANS)) &&
188 >                                m->otype != MAT_CLIP &&
189 >                                (ofun[m->otype].flags & (T_M|T_X))) {
190                          if (irr_ignore(m->otype)) {
232 – #if  MAXLOOP
233 –                                depth--;
234 – #endif
191                                  raytrans(r);
192                                  return(1);
193                          }
194                          if (!islight(m->otype))
195                                  m = &Lamb;
196                  }
197 <                                        /* materials call raytexture */
198 <                gotmat = (*ofun[m->otype].funp)(m, r);
197 >                if ((*ofun[m->otype].funp)(m, r))
198 >                        return(1);      /* materials call raytexture() */
199          }
200 < #if  MAXLOOP
245 <        depth--;
246 < #endif
247 <        return(gotmat);
200 >        return(0);                      /* no material! */
201   }
202  
203  
204 < void
205 < rayparticipate(r)                       /* compute ray medium participation */
206 < register RAY  *r;
204 > extern void
205 > rayparticipate(                 /* compute ray medium participation */
206 >        register RAY  *r
207 > )
208   {
209          COLOR   ce, ca;
210          double  re, ge, be;
# Line 265 | Line 219 | register RAY  *r;
219                  ge *= 1. - colval(r->albedo,GRN);
220                  be *= 1. - colval(r->albedo,BLU);
221          }
222 <        setcolor(ce,    re<=0. ? 1. : re>92. ? 0. : exp(-re),
223 <                        ge<=0. ? 1. : ge>92. ? 0. : exp(-ge),
224 <                        be<=0. ? 1. : be>92. ? 0. : exp(-be));
225 <        multcolor(r->rcol, ce);                 /* path absorption */
222 >        setcolor(ce,    re<=FTINY ? 1. : re>92. ? 0. : exp(-re),
223 >                        ge<=FTINY ? 1. : ge>92. ? 0. : exp(-ge),
224 >                        be<=FTINY ? 1. : be>92. ? 0. : exp(-be));
225 >        multcolor(r->rcol, ce);                 /* path extinction */
226          if (r->crtype & SHADOW || intens(r->albedo) <= FTINY)
227                  return;                         /* no scattering */
228          setcolor(ca,
# Line 280 | Line 234 | register RAY  *r;
234   }
235  
236  
237 < raytexture(r, mod)                      /* get material modifiers */
238 < RAY  *r;
239 < int  mod;
237 > extern void
238 > raytexture(                     /* get material modifiers */
239 >        RAY  *r,
240 >        OBJECT  mod
241 > )
242   {
243          register OBJREC  *m;
288 – #if  MAXLOOP
289 –        static int  depth = 0;
290 –                                        /* check for infinite loop */
291 –        if (depth++ >= MAXLOOP)
292 –                objerror(r->ro, USER, "modifier loop");
293 – #endif
244                                          /* execute textures and patterns */
245          for ( ; mod != OVOID; mod = m->omod) {
246                  m = objptr(mod);
# Line 306 | Line 256 | int  mod;
256                          objerror(r->ro, USER, errmsg);
257                  }
258          }
309 – #if  MAXLOOP
310 –        depth--;                        /* end here */
311 – #endif
259   }
260  
261  
262 < int
263 < raymixture(r, fore, back, coef)         /* mix modifiers */
264 < register RAY  *r;
265 < OBJECT  fore, back;
266 < double  coef;
262 > extern int
263 > raymixture(             /* mix modifiers */
264 >        register RAY  *r,
265 >        OBJECT  fore,
266 >        OBJECT  back,
267 >        double  coef
268 > )
269   {
270          RAY  fr, br;
271          int  foremat, backmat;
# Line 329 | Line 278 | double  coef;
278                                          /* compute foreground and background */
279          foremat = backmat = 0;
280                                          /* foreground */
281 <        copystruct(&fr, r);
281 >        fr = *r;
282          if (coef > FTINY)
283                  foremat = rayshade(&fr, fore);
284                                          /* background */
285 <        copystruct(&br, r);
285 >        br = *r;
286          if (coef < 1.0-FTINY)
287                  backmat = rayshade(&br, back);
288                                          /* check for transparency */
289 <        if (backmat ^ foremat)
289 >        if (backmat ^ foremat) {
290                  if (backmat && coef > FTINY)
291                          raytrans(&fr);
292                  else if (foremat && coef < 1.0-FTINY)
293                          raytrans(&br);
294 +        }
295                                          /* mix perturbations */
296          for (i = 0; i < 3; i++)
297                  r->pert[i] = coef*fr.pert[i] + (1.0-coef)*br.pert[i];
# Line 363 | Line 313 | double  coef;
313   }
314  
315  
316 < double
317 < raydist(r, flags)               /* compute (cumulative) ray distance */
318 < register RAY  *r;
319 < register int  flags;
316 > extern double
317 > raydist(                /* compute (cumulative) ray distance */
318 >        register const RAY  *r,
319 >        register int  flags
320 > )
321   {
322          double  sum = 0.0;
323  
# Line 378 | Line 329 | register int  flags;
329   }
330  
331  
332 < double
333 < raynormal(norm, r)              /* compute perturbed normal for ray */
334 < FVECT  norm;
335 < register RAY  *r;
332 > extern void
333 > raycontrib(             /* compute (cumulative) ray contribution */
334 >        COLOR  rc,
335 >        const RAY  *r,
336 >        int  flags
337 > )
338   {
339 +        COLOR   eext, ext1;
340 +        
341 +        setcolor(eext, 0., 0., 0.);
342 +        setcolor(rc, 1., 1., 1.);
343 +
344 +        while (r != NULL && r->crtype&flags) {
345 +                multcolor(rc, r->rcoef);
346 +                copycolor(ext1, r->cext);
347 +                scalecolor(ext1, r->rot);
348 +                addcolor(eext, ext1);
349 +                r = r->parent;
350 +        }
351 +        if (intens(eext) > FTINY) {
352 +                setcolor(ext1,  exp(-colval(eext,RED)),
353 +                                exp(-colval(eext,GRN)),
354 +                                exp(-colval(eext,BLU)));
355 +                multcolor(rc, ext1);
356 +        }
357 + }
358 +
359 +
360 + extern double
361 + raynormal(              /* compute perturbed normal for ray */
362 +        FVECT  norm,
363 +        register RAY  *r
364 + )
365 + {
366          double  newdot;
367          register int  i;
368  
# Line 413 | Line 393 | register RAY  *r;
393   }
394  
395  
396 < void
397 < newrayxf(r)                     /* get new tranformation matrix for ray */
398 < RAY  *r;
396 > extern void
397 > newrayxf(                       /* get new tranformation matrix for ray */
398 >        RAY  *r
399 > )
400   {
401          static struct xfn {
402                  struct xfn  *next;
403                  FULLXF  xf;
404          }  xfseed = { &xfseed }, *xflast = &xfseed;
405          register struct xfn  *xp;
406 <        register RAY  *rp;
406 >        register const RAY  *rp;
407  
408          /*
409           * Search for transform in circular list that
# Line 450 | Line 431 | RAY  *r;
431   }
432  
433  
434 < void
435 < flipsurface(r)                  /* reverse surface orientation */
436 < register RAY  *r;
434 > extern void
435 > flipsurface(                    /* reverse surface orientation */
436 >        register RAY  *r
437 > )
438   {
439          r->rod = -r->rod;
440          r->ron[0] = -r->ron[0];
# Line 464 | Line 446 | register RAY  *r;
446   }
447  
448  
449 < int
450 < localhit(r, scene)              /* check for hit in the octree */
451 < register RAY  *r;
452 < register CUBE  *scene;
449 > extern void
450 > rayhit(                 /* standard ray hit test */
451 >        OBJECT  *oset,
452 >        RAY  *r
453 > )
454   {
455 +        OBJREC  *o;
456 +        int     i;
457 +
458 +        for (i = oset[0]; i > 0; i--) {
459 +                o = objptr(oset[i]);
460 +                if ((*ofun[o->otype].funp)(o, r))
461 +                        r->robj = oset[i];
462 +        }
463 + }
464 +
465 +
466 + extern int
467 + localhit(               /* check for hit in the octree */
468 +        register RAY  *r,
469 +        register CUBE  *scene
470 + )
471 + {
472          OBJECT  cxset[MAXCSET+1];       /* set of checked objects */
473          FVECT  curpos;                  /* current cube position */
474          int  sflags;                    /* sign flags */
# Line 522 | Line 522 | register CUBE  *scene;
522          }
523          cxset[0] = 0;
524          raymove(curpos, cxset, sflags, r, scene);
525 <        return(r->ro != NULL & r->ro != &Aftplane);
525 >        return((r->ro != NULL) & (r->ro != &Aftplane));
526   }
527  
528  
529   static int
530 < raymove(pos, cxs, dirf, r, cu)          /* check for hit as we move */
531 < FVECT  pos;                     /* current position, modified herein */
532 < OBJECT  *cxs;                   /* checked objects, modified by checkhit */
533 < int  dirf;                      /* direction indicators to speed tests */
534 < register RAY  *r;
535 < register CUBE  *cu;
530 > raymove(                /* check for hit as we move */
531 >        FVECT  pos,                     /* current position, modified herein */
532 >        OBJECT  *cxs,                   /* checked objects, modified by checkhit */
533 >        int  dirf,                      /* direction indicators to speed tests */
534 >        register RAY  *r,
535 >        register CUBE  *cu
536 > )
537   {
538          int  ax;
539          double  dt, t;
# Line 613 | Line 614 | register CUBE  *cu;
614  
615  
616   static int
617 < checkhit(r, cu, cxs)            /* check for hit in full cube */
618 < register RAY  *r;
619 < CUBE  *cu;
620 < OBJECT  *cxs;
617 > checkhit(               /* check for hit in full cube */
618 >        register RAY  *r,
619 >        CUBE  *cu,
620 >        OBJECT  *cxs
621 > )
622   {
623          OBJECT  oset[MAXSET+1];
622 –        register OBJREC  *o;
623 –        register int  i;
624  
625          objset(oset, cu->cutree);
626 <        checkset(oset, cxs);                    /* eliminate double-checking */
627 <        for (i = oset[0]; i > 0; i--) {
628 <                o = objptr(oset[i]);
629 <                if ((*ofun[o->otype].funp)(o, r))
630 <                        r->robj = oset[i];
631 <        }
632 <        if (r->ro == NULL)
626 >        checkset(oset, cxs);                    /* avoid double-checking */
627 >
628 >        (*r->hitf)(oset, r);                    /* test for hit in set */
629 >
630 >        if (r->robj == OVOID)
631                  return(0);                      /* no scores yet */
632  
633          return(incube(cu, r->rop));             /* hit OK if in current cube */
# Line 637 | Line 635 | OBJECT  *cxs;
635  
636  
637   static void
638 < checkset(os, cs)                /* modify checked set and set to check */
639 < register OBJECT  *os;                   /* os' = os - cs */
640 < register OBJECT  *cs;                   /* cs' = cs + os */
638 > checkset(               /* modify checked set and set to check */
639 >        register OBJECT  *os,                   /* os' = os - cs */
640 >        register OBJECT  *cs                    /* cs' = cs + os */
641 > )
642   {
643          OBJECT  cset[MAXCSET+MAXSET+1];
644          register int  i, j;

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