12 |
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13 |
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#include "ray.h" |
14 |
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|
15 |
+ |
#include "octree.h" |
16 |
+ |
|
17 |
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#include "source.h" |
18 |
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|
19 |
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#include "otypes.h" |
26 |
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|
27 |
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|
28 |
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extern double dstrsrc; /* source distribution amount */ |
29 |
+ |
extern double shadthresh; /* relative shadow threshold */ |
30 |
+ |
extern double shadcert; /* shadow testing certainty */ |
31 |
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|
32 |
< |
SOURCE srcval[MAXSOURCE]; /* our array of sources */ |
32 |
> |
SRCREC *source = NULL; /* our list of sources */ |
33 |
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int nsources = 0; /* the number of sources */ |
34 |
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|
35 |
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|
62 |
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m->oargs.farg[3] <= FTINY) |
63 |
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continue; /* don't bother */ |
64 |
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|
65 |
< |
if (nsources >= MAXSOURCE) |
66 |
< |
error(INTERNAL, "too many sources in marksources"); |
65 |
> |
if (source == NULL) |
66 |
> |
source = (SRCREC *)malloc(sizeof(SRCREC)); |
67 |
> |
else |
68 |
> |
source = (SRCREC *)realloc((char *)source, |
69 |
> |
(unsigned)(nsources+1)*sizeof(SRCREC)); |
70 |
> |
if (source == NULL) |
71 |
> |
error(SYSTEM, "out of memory in marksources"); |
72 |
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|
73 |
< |
newsource(&srcval[nsources], o); |
73 |
> |
newsource(&source[nsources], o); |
74 |
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|
75 |
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if (m->otype == MAT_GLOW) { |
76 |
< |
srcval[nsources].sflags |= SPROX; |
77 |
< |
srcval[nsources].sl.prox = m->oargs.farg[3]; |
76 |
> |
source[nsources].sflags |= SPROX; |
77 |
> |
source[nsources].sl.prox = m->oargs.farg[3]; |
78 |
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if (o->otype == OBJ_SOURCE) |
79 |
< |
srcval[nsources].sflags |= SSKIP; |
79 |
> |
source[nsources].sflags |= SSKIP; |
80 |
|
} else if (m->otype == MAT_SPOT) { |
81 |
< |
srcval[nsources].sflags |= SSPOT; |
82 |
< |
srcval[nsources].sl.s = makespot(m); |
81 |
> |
source[nsources].sflags |= SSPOT; |
82 |
> |
source[nsources].sl.s = makespot(m); |
83 |
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} |
84 |
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nsources++; |
85 |
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} |
87 |
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|
88 |
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|
89 |
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newsource(src, so) /* add a source to the array */ |
90 |
< |
register SOURCE *src; |
90 |
> |
register SRCREC *src; |
91 |
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register OBJREC *so; |
92 |
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{ |
93 |
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double cos(), tan(), sqrt(); |
98 |
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register int i; |
99 |
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|
100 |
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src->sflags = 0; |
101 |
+ |
src->nhits = 1; src->ntests = 2; /* start probability = 1/2 */ |
102 |
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src->so = so; |
103 |
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|
104 |
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switch (so->otype) { |
179 |
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double d; |
180 |
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register int i; |
181 |
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|
182 |
< |
if (srcval[sn].sflags & SSKIP) |
182 |
> |
if (source[sn].sflags & SSKIP) |
183 |
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return(0.0); /* skip this source */ |
184 |
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|
185 |
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rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
186 |
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|
187 |
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sr->rsrc = sn; /* remember source */ |
188 |
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/* get source direction */ |
189 |
< |
if (srcval[sn].sflags & SDISTANT) |
189 |
> |
if (source[sn].sflags & SDISTANT) |
190 |
|
/* constant direction */ |
191 |
< |
VCOPY(sr->rdir, srcval[sn].sloc); |
191 |
> |
VCOPY(sr->rdir, source[sn].sloc); |
192 |
|
else { /* compute direction */ |
193 |
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for (i = 0; i < 3; i++) |
194 |
< |
sr->rdir[i] = srcval[sn].sloc[i] - sr->rorg[i]; |
194 |
> |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
195 |
|
|
196 |
< |
if (srcval[sn].so->otype == OBJ_FACE) |
197 |
< |
norm = getface(srcval[sn].so)->norm; |
198 |
< |
else if (srcval[sn].so->otype == OBJ_RING) |
199 |
< |
norm = getcone(srcval[sn].so,0)->ad; |
196 |
> |
if (source[sn].so->otype == OBJ_FACE) |
197 |
> |
norm = getface(source[sn].so)->norm; |
198 |
> |
else if (source[sn].so->otype == OBJ_RING) |
199 |
> |
norm = getcone(source[sn].so,0)->ad; |
200 |
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|
201 |
|
if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= FTINY) |
202 |
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return(0.0); /* behind surface! */ |
204 |
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if (dstrsrc > FTINY) { |
205 |
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/* distribute source direction */ |
206 |
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for (i = 0; i < 3; i++) |
207 |
< |
vd[i] = dstrsrc * srcval[sn].ss * (1.0 - 2.0*frandom()); |
207 |
> |
vd[i] = dstrsrc * source[sn].ss * (1.0 - 2.0*frandom()); |
208 |
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|
209 |
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if (norm != NULL) { /* project offset */ |
210 |
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d = DOT(vd, norm); |
214 |
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for (i = 0; i < 3; i++) /* offset source direction */ |
215 |
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sr->rdir[i] += vd[i]; |
216 |
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|
217 |
< |
} else if (srcval[sn].sflags & SDISTANT) |
217 |
> |
} else if (source[sn].sflags & SDISTANT) |
218 |
|
/* already normalized */ |
219 |
< |
return(srcval[sn].ss2); |
219 |
> |
return(source[sn].ss2); |
220 |
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|
221 |
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if ((d = normalize(sr->rdir)) == 0.0) |
222 |
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/* at source! */ |
223 |
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return(0.0); |
224 |
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|
225 |
< |
if (srcval[sn].sflags & SDISTANT) |
225 |
> |
if (source[sn].sflags & SDISTANT) |
226 |
|
/* domega constant */ |
227 |
< |
return(srcval[sn].ss2); |
227 |
> |
return(source[sn].ss2); |
228 |
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|
229 |
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else { |
230 |
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/* check proximity */ |
231 |
< |
if (srcval[sn].sflags & SPROX && |
232 |
< |
d > srcval[sn].sl.prox) |
231 |
> |
if (source[sn].sflags & SPROX && |
232 |
> |
d > source[sn].sl.prox) |
233 |
|
return(0.0); |
234 |
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|
235 |
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if (norm != NULL) |
237 |
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else |
238 |
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ddot = 1.0; |
239 |
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/* check angle */ |
240 |
< |
if (srcval[sn].sflags & SSPOT) { |
241 |
< |
if (srcval[sn].sl.s->siz < 2.0*PI * |
242 |
< |
(1.0 + DOT(srcval[sn].sl.s->aim,sr->rdir))) |
240 |
> |
if (source[sn].sflags & SSPOT) { |
241 |
> |
if (source[sn].sl.s->siz < 2.0*PI * |
242 |
> |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
243 |
|
return(0.0); |
244 |
< |
d += srcval[sn].sl.s->flen; |
244 |
> |
d += source[sn].sl.s->flen; |
245 |
|
} |
246 |
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/* return domega */ |
247 |
< |
return(ddot*srcval[sn].ss2/(d*d)); |
247 |
> |
return(ddot*source[sn].ss2/(d*d)); |
248 |
|
} |
249 |
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} |
250 |
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|
261 |
|
first = 0; last = nsources-1; |
262 |
|
} |
263 |
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for (i = first; i <= last; i++) |
264 |
< |
if (srcval[i].sflags & SDISTANT) |
264 |
> |
if (source[i].sflags & SDISTANT) |
265 |
|
/* |
266 |
|
* Check to see if ray is within |
267 |
|
* solid angle of source. |
268 |
|
*/ |
269 |
< |
if (2.0*PI * (1.0 - DOT(srcval[i].sloc,r->rdir)) |
270 |
< |
<= srcval[i].ss2) { |
271 |
< |
r->ro = srcval[i].so; |
272 |
< |
if (!(srcval[i].sflags & SSKIP)) |
269 |
> |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
270 |
> |
<= source[i].ss2) { |
271 |
> |
r->ro = source[i].so; |
272 |
> |
if (!(source[i].sflags & SSKIP)) |
273 |
|
break; |
274 |
|
} |
275 |
|
|
277 |
|
for (i = 0; i < 3; i++) |
278 |
|
r->ron[i] = -r->rdir[i]; |
279 |
|
r->rod = 1.0; |
280 |
+ |
r->rofs = 1.0; setident4(r->rofx); |
281 |
+ |
r->robs = 1.0; setident4(r->robx); |
282 |
|
return(1); |
283 |
|
} |
284 |
|
return(0); |
285 |
|
} |
286 |
|
|
287 |
|
|
288 |
+ |
static int |
289 |
+ |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
290 |
+ |
register CNTPTR *sc1, *sc2; |
291 |
+ |
{ |
292 |
+ |
if (sc1->brt > sc2->brt) |
293 |
+ |
return(-1); |
294 |
+ |
if (sc1->brt < sc2->brt) |
295 |
+ |
return(1); |
296 |
+ |
return(0); |
297 |
+ |
} |
298 |
+ |
|
299 |
+ |
|
300 |
+ |
direct(r, f, p) /* add direct component */ |
301 |
+ |
RAY *r; /* ray that hit surface */ |
302 |
+ |
int (*f)(); /* direct component coefficient function */ |
303 |
+ |
char *p; /* data for f */ |
304 |
+ |
{ |
305 |
+ |
extern double pow(); |
306 |
+ |
register int sn; |
307 |
+ |
register CONTRIB *srccnt; |
308 |
+ |
register CNTPTR *cntord; |
309 |
+ |
int nshadcheck, ncnts; |
310 |
+ |
double prob, ourthresh, hwt, test2, hit2; |
311 |
+ |
RAY sr; |
312 |
+ |
|
313 |
+ |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
314 |
+ |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
315 |
+ |
if (srccnt == NULL || cntord == NULL) |
316 |
+ |
error(SYSTEM, "out of memory in direct"); |
317 |
+ |
/* compute number to check */ |
318 |
+ |
nshadcheck = pow((double)nsources, shadcert) + .5; |
319 |
+ |
/* modify threshold */ |
320 |
+ |
ourthresh = shadthresh / r->rweight; |
321 |
+ |
/* potential contributions */ |
322 |
+ |
for (sn = 0; sn < nsources; sn++) { |
323 |
+ |
cntord[sn].sno = sn; |
324 |
+ |
cntord[sn].brt = 0.0; |
325 |
+ |
/* get source ray */ |
326 |
+ |
if ((srccnt[sn].dom = srcray(&sr, r, sn)) == 0.0) |
327 |
+ |
continue; |
328 |
+ |
VCOPY(srccnt[sn].dir, sr.rdir); |
329 |
+ |
/* compute coefficient */ |
330 |
+ |
(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
331 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
332 |
+ |
if (cntord[sn].brt <= 0.0) |
333 |
+ |
continue; |
334 |
+ |
/* compute intersection */ |
335 |
+ |
if (!( source[sn].sflags & SDISTANT ? |
336 |
+ |
sourcehit(&sr) : |
337 |
+ |
(*ofun[source[sn].so->otype].funp) |
338 |
+ |
(source[sn].so, &sr) )) |
339 |
+ |
continue; |
340 |
+ |
/* compute contribution */ |
341 |
+ |
rayshade(&sr, sr.ro->omod); |
342 |
+ |
multcolor(srccnt[sn].val, sr.rcol); |
343 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
344 |
+ |
} |
345 |
+ |
/* sort contributions */ |
346 |
+ |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
347 |
+ |
{ /* find last */ |
348 |
+ |
register int l, m; |
349 |
+ |
|
350 |
+ |
sn = 0; ncnts = l = nsources; |
351 |
+ |
while ((m = (sn + ncnts) >> 1) != l) { |
352 |
+ |
if (cntord[m].brt > 0.0) |
353 |
+ |
sn = m; |
354 |
+ |
else |
355 |
+ |
ncnts = m; |
356 |
+ |
l = m; |
357 |
+ |
} |
358 |
+ |
} |
359 |
+ |
/* accumulate tail */ |
360 |
+ |
for (sn = ncnts-1; sn > 0; sn--) |
361 |
+ |
cntord[sn-1].brt += cntord[sn].brt; |
362 |
+ |
/* start with prob=.5 */ |
363 |
+ |
hit2 = 0.5; test2 = 1.0; |
364 |
+ |
/* test for shadows */ |
365 |
+ |
for (sn = 0; sn < ncnts; sn++) { |
366 |
+ |
/* check threshold */ |
367 |
+ |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
368 |
+ |
cntord[sn].brt-cntord[sn+nshadcheck].brt) < |
369 |
+ |
ourthresh*bright(r->rcol)) |
370 |
+ |
break; |
371 |
+ |
/* get statistics */ |
372 |
+ |
hwt = (double)source[cntord[sn].sno].nhits / |
373 |
+ |
(double)source[cntord[sn].sno].ntests; |
374 |
+ |
test2 += hwt; |
375 |
+ |
source[cntord[sn].sno].ntests++; |
376 |
+ |
/* test for hit */ |
377 |
+ |
rayorigin(&sr, r, SHADOW, 1.0); |
378 |
+ |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
379 |
+ |
if (localhit(&sr, &thescene) && |
380 |
+ |
sr.ro != source[cntord[sn].sno].so) { |
381 |
+ |
/* check for transmission */ |
382 |
+ |
if (sr.clipset != NULL && inset(sr.clipset, sr.ro->omod)) |
383 |
+ |
raytrans(&sr); |
384 |
+ |
else |
385 |
+ |
rayshade(&sr, sr.ro->omod); |
386 |
+ |
if (bright(sr.rcol) <= FTINY) |
387 |
+ |
continue; /* missed! */ |
388 |
+ |
(*f)(srccnt[cntord[sn].sno].val, p, |
389 |
+ |
srccnt[cntord[sn].sno].dir, |
390 |
+ |
srccnt[cntord[sn].sno].dom); |
391 |
+ |
multcolor(srccnt[cntord[sn].sno].val, sr.rcol); |
392 |
+ |
} |
393 |
+ |
/* add contribution if hit */ |
394 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
395 |
+ |
hit2 += hwt; |
396 |
+ |
source[cntord[sn].sno].nhits++; |
397 |
+ |
} |
398 |
+ |
/* weighted hit rate */ |
399 |
+ |
hwt = hit2 / test2; |
400 |
+ |
#ifdef notdef |
401 |
+ |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
402 |
+ |
sn, ncnts-sn, hwt); |
403 |
+ |
eputs(errmsg); |
404 |
+ |
#endif |
405 |
+ |
/* add in untested sources */ |
406 |
+ |
for ( ; sn < ncnts; sn++) { |
407 |
+ |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
408 |
+ |
(double)source[cntord[sn].sno].ntests; |
409 |
+ |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
410 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
411 |
+ |
} |
412 |
+ |
|
413 |
+ |
free(srccnt); |
414 |
+ |
free(cntord); |
415 |
+ |
} |
416 |
+ |
|
417 |
+ |
|
418 |
|
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
419 |
|
r->rsrc>=0 && \ |
420 |
< |
srcval[r->rsrc].so!=r->ro) |
420 |
> |
source[r->rsrc].so!=r->ro) |
421 |
|
|
422 |
|
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
423 |
|
!(r->rtype&REFLECTED) && /* hack! */\ |
424 |
|
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
425 |
|
|
426 |
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
427 |
< |
!(r->rsrc>=0&&srcval[r->rsrc].so==r->ro)) |
427 |
> |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
428 |
|
|
429 |
|
|
430 |
|
m_light(m, r) /* ray hit a light source */ |
431 |
|
register OBJREC *m; |
432 |
|
register RAY *r; |
433 |
|
{ |
292 |
– |
/* check for behind */ |
293 |
– |
if (r->rod < 0.0) |
294 |
– |
return; |
434 |
|
/* check for over-counting */ |
435 |
|
if (wrongsource(m, r) || badambient(m, r)) |
436 |
|
return; |
444 |
|
|
445 |
|
/* otherwise treat as source */ |
446 |
|
} else { |
447 |
+ |
/* check for behind */ |
448 |
+ |
if (r->rod < 0.0) |
449 |
+ |
return; |
450 |
|
/* get distribution pattern */ |
451 |
|
raytexture(r, m->omod); |
452 |
|
/* get source color */ |