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 |
|
|
27 |
|
|
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 |
|
|
32 |
< |
SOURCE srcval[MAXSOURCE]; /* our array of sources */ |
32 |
> |
SRCREC *source = NULL; /* our list of sources */ |
33 |
|
int nsources = 0; /* the number of sources */ |
34 |
|
|
35 |
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|
47 |
|
|
48 |
|
m = objptr(o->omod); |
49 |
|
|
50 |
< |
if (m->otype != MAT_LIGHT && |
47 |
< |
m->otype != MAT_ILLUM && |
48 |
< |
m->otype != MAT_GLOW && |
49 |
< |
m->otype != MAT_SPOT) |
50 |
> |
if (!islight(m->otype)) |
51 |
|
continue; |
52 |
|
|
53 |
|
if (m->oargs.nfargs != (m->otype == MAT_GLOW ? 4 : |
59 |
|
m->oargs.farg[3] <= FTINY) |
60 |
|
continue; /* don't bother */ |
61 |
|
|
62 |
< |
if (nsources >= MAXSOURCE) |
63 |
< |
error(INTERNAL, "too many sources in marksources"); |
62 |
> |
if (source == NULL) |
63 |
> |
source = (SRCREC *)malloc(sizeof(SRCREC)); |
64 |
> |
else |
65 |
> |
source = (SRCREC *)realloc((char *)source, |
66 |
> |
(unsigned)(nsources+1)*sizeof(SRCREC)); |
67 |
> |
if (source == NULL) |
68 |
> |
error(SYSTEM, "out of memory in marksources"); |
69 |
|
|
70 |
< |
newsource(&srcval[nsources], o); |
70 |
> |
newsource(&source[nsources], o); |
71 |
|
|
72 |
|
if (m->otype == MAT_GLOW) { |
73 |
< |
srcval[nsources].sflags |= SPROX; |
74 |
< |
srcval[nsources].sl.prox = m->oargs.farg[3]; |
73 |
> |
source[nsources].sflags |= SPROX; |
74 |
> |
source[nsources].sl.prox = m->oargs.farg[3]; |
75 |
|
if (o->otype == OBJ_SOURCE) |
76 |
< |
srcval[nsources].sflags |= SSKIP; |
76 |
> |
source[nsources].sflags |= SSKIP; |
77 |
|
} else if (m->otype == MAT_SPOT) { |
78 |
< |
srcval[nsources].sflags |= SSPOT; |
79 |
< |
srcval[nsources].sl.s = makespot(m); |
78 |
> |
source[nsources].sflags |= SSPOT; |
79 |
> |
source[nsources].sl.s = makespot(m); |
80 |
|
} |
81 |
|
nsources++; |
82 |
|
} |
84 |
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|
85 |
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|
86 |
|
newsource(src, so) /* add a source to the array */ |
87 |
< |
register SOURCE *src; |
87 |
> |
register SRCREC *src; |
88 |
|
register OBJREC *so; |
89 |
|
{ |
90 |
|
double cos(), tan(), sqrt(); |
95 |
|
register int i; |
96 |
|
|
97 |
|
src->sflags = 0; |
98 |
+ |
src->nhits = 1; src->ntests = 2; /* start probability = 1/2 */ |
99 |
|
src->so = so; |
100 |
|
|
101 |
|
switch (so->otype) { |
176 |
|
double d; |
177 |
|
register int i; |
178 |
|
|
179 |
< |
if (srcval[sn].sflags & SSKIP) |
179 |
> |
if (source[sn].sflags & SSKIP) |
180 |
|
return(0.0); /* skip this source */ |
181 |
|
|
182 |
|
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
183 |
|
|
184 |
|
sr->rsrc = sn; /* remember source */ |
185 |
|
/* get source direction */ |
186 |
< |
if (srcval[sn].sflags & SDISTANT) |
186 |
> |
if (source[sn].sflags & SDISTANT) |
187 |
|
/* constant direction */ |
188 |
< |
VCOPY(sr->rdir, srcval[sn].sloc); |
188 |
> |
VCOPY(sr->rdir, source[sn].sloc); |
189 |
|
else { /* compute direction */ |
190 |
|
for (i = 0; i < 3; i++) |
191 |
< |
sr->rdir[i] = srcval[sn].sloc[i] - sr->rorg[i]; |
191 |
> |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
192 |
|
|
193 |
< |
if (srcval[sn].so->otype == OBJ_FACE) |
194 |
< |
norm = getface(srcval[sn].so)->norm; |
195 |
< |
else if (srcval[sn].so->otype == OBJ_RING) |
196 |
< |
norm = getcone(srcval[sn].so,0)->ad; |
193 |
> |
if (source[sn].so->otype == OBJ_FACE) |
194 |
> |
norm = getface(source[sn].so)->norm; |
195 |
> |
else if (source[sn].so->otype == OBJ_RING) |
196 |
> |
norm = getcone(source[sn].so,0)->ad; |
197 |
|
|
198 |
< |
if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= 0.0) |
198 |
> |
if (norm != NULL && (ddot = -DOT(sr->rdir, norm)) <= FTINY) |
199 |
|
return(0.0); /* behind surface! */ |
200 |
|
} |
201 |
|
if (dstrsrc > FTINY) { |
202 |
|
/* distribute source direction */ |
203 |
|
for (i = 0; i < 3; i++) |
204 |
< |
vd[i] = dstrsrc * srcval[sn].ss * (1.0 - 2.0*frandom()); |
204 |
> |
vd[i] = dstrsrc * source[sn].ss * (1.0 - 2.0*frandom()); |
205 |
|
|
206 |
|
if (norm != NULL) { /* project offset */ |
207 |
|
d = DOT(vd, norm); |
211 |
|
for (i = 0; i < 3; i++) /* offset source direction */ |
212 |
|
sr->rdir[i] += vd[i]; |
213 |
|
|
214 |
< |
} else if (srcval[sn].sflags & SDISTANT) |
214 |
> |
} else if (source[sn].sflags & SDISTANT) |
215 |
|
/* already normalized */ |
216 |
< |
return(srcval[sn].ss2); |
216 |
> |
return(source[sn].ss2); |
217 |
|
|
218 |
|
if ((d = normalize(sr->rdir)) == 0.0) |
219 |
|
/* at source! */ |
220 |
|
return(0.0); |
221 |
|
|
222 |
< |
if (srcval[sn].sflags & SDISTANT) |
222 |
> |
if (source[sn].sflags & SDISTANT) |
223 |
|
/* domega constant */ |
224 |
< |
return(srcval[sn].ss2); |
224 |
> |
return(source[sn].ss2); |
225 |
|
|
226 |
|
else { |
227 |
|
/* check proximity */ |
228 |
< |
if (srcval[sn].sflags & SPROX && |
229 |
< |
d > srcval[sn].sl.prox) |
228 |
> |
if (source[sn].sflags & SPROX && |
229 |
> |
d > source[sn].sl.prox) |
230 |
|
return(0.0); |
231 |
|
|
232 |
|
if (norm != NULL) |
234 |
|
else |
235 |
|
ddot = 1.0; |
236 |
|
/* check angle */ |
237 |
< |
if (srcval[sn].sflags & SSPOT) { |
238 |
< |
if (srcval[sn].sl.s->siz < 2.0*PI * |
239 |
< |
(1.0 + DOT(srcval[sn].sl.s->aim,sr->rdir))) |
237 |
> |
if (source[sn].sflags & SSPOT) { |
238 |
> |
if (source[sn].sl.s->siz < 2.0*PI * |
239 |
> |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
240 |
|
return(0.0); |
241 |
< |
d += srcval[sn].sl.s->flen; |
241 |
> |
d += source[sn].sl.s->flen; |
242 |
|
} |
243 |
|
/* return domega */ |
244 |
< |
return(ddot*srcval[sn].ss2/(d*d)); |
244 |
> |
return(ddot*source[sn].ss2/(d*d)); |
245 |
|
} |
246 |
|
} |
247 |
|
|
258 |
|
first = 0; last = nsources-1; |
259 |
|
} |
260 |
|
for (i = first; i <= last; i++) |
261 |
< |
if (srcval[i].sflags & SDISTANT) |
261 |
> |
if (source[i].sflags & SDISTANT) |
262 |
|
/* |
263 |
|
* Check to see if ray is within |
264 |
|
* solid angle of source. |
265 |
|
*/ |
266 |
< |
if (2.0*PI * (1.0 - DOT(srcval[i].sloc,r->rdir)) |
267 |
< |
<= srcval[i].ss2) { |
268 |
< |
r->ro = srcval[i].so; |
269 |
< |
if (!(srcval[i].sflags & SSKIP)) |
266 |
> |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
267 |
> |
<= source[i].ss2) { |
268 |
> |
r->ro = source[i].so; |
269 |
> |
if (!(source[i].sflags & SSKIP)) |
270 |
|
break; |
271 |
|
} |
272 |
|
|
274 |
|
for (i = 0; i < 3; i++) |
275 |
|
r->ron[i] = -r->rdir[i]; |
276 |
|
r->rod = 1.0; |
277 |
+ |
r->rofs = 1.0; setident4(r->rofx); |
278 |
+ |
r->robs = 1.0; setident4(r->robx); |
279 |
|
return(1); |
280 |
|
} |
281 |
|
return(0); |
282 |
|
} |
283 |
|
|
284 |
|
|
285 |
+ |
static int |
286 |
+ |
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
287 |
+ |
register CNTPTR *sc1, *sc2; |
288 |
+ |
{ |
289 |
+ |
if (sc1->brt > sc2->brt) |
290 |
+ |
return(-1); |
291 |
+ |
if (sc1->brt < sc2->brt) |
292 |
+ |
return(1); |
293 |
+ |
return(0); |
294 |
+ |
} |
295 |
+ |
|
296 |
+ |
|
297 |
+ |
direct(r, f, p) /* add direct component */ |
298 |
+ |
RAY *r; /* ray that hit surface */ |
299 |
+ |
int (*f)(); /* direct component coefficient function */ |
300 |
+ |
char *p; /* data for f */ |
301 |
+ |
{ |
302 |
+ |
extern double pow(); |
303 |
+ |
register int sn; |
304 |
+ |
register CONTRIB *srccnt; |
305 |
+ |
register CNTPTR *cntord; |
306 |
+ |
int nshadcheck, ncnts; |
307 |
+ |
double prob, ourthresh, hwt, test2, hit2; |
308 |
+ |
RAY sr; |
309 |
+ |
|
310 |
+ |
if (nsources <= 0) |
311 |
+ |
return; |
312 |
+ |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
313 |
+ |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
314 |
+ |
if (srccnt == NULL || cntord == NULL) |
315 |
+ |
error(SYSTEM, "out of memory in direct"); |
316 |
+ |
/* compute number to check */ |
317 |
+ |
nshadcheck = pow((double)nsources, shadcert) + .5; |
318 |
+ |
/* modify threshold */ |
319 |
+ |
ourthresh = shadthresh / r->rweight; |
320 |
+ |
/* potential contributions */ |
321 |
+ |
for (sn = 0; sn < nsources; sn++) { |
322 |
+ |
cntord[sn].sno = sn; |
323 |
+ |
cntord[sn].brt = 0.0; |
324 |
+ |
/* get source ray */ |
325 |
+ |
if ((srccnt[sn].dom = srcray(&sr, r, sn)) == 0.0) |
326 |
+ |
continue; |
327 |
+ |
VCOPY(srccnt[sn].dir, sr.rdir); |
328 |
+ |
/* compute coefficient */ |
329 |
+ |
(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
330 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
331 |
+ |
if (cntord[sn].brt <= 0.0) |
332 |
+ |
continue; |
333 |
+ |
/* compute intersection */ |
334 |
+ |
if (!( source[sn].sflags & SDISTANT ? |
335 |
+ |
sourcehit(&sr) : |
336 |
+ |
(*ofun[source[sn].so->otype].funp) |
337 |
+ |
(source[sn].so, &sr) )) |
338 |
+ |
continue; |
339 |
+ |
/* compute contribution */ |
340 |
+ |
raycont(&sr); |
341 |
+ |
multcolor(srccnt[sn].val, sr.rcol); |
342 |
+ |
cntord[sn].brt = bright(srccnt[sn].val); |
343 |
+ |
} |
344 |
+ |
/* sort contributions */ |
345 |
+ |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
346 |
+ |
{ /* find last */ |
347 |
+ |
register int l, m; |
348 |
+ |
|
349 |
+ |
sn = 0; ncnts = l = nsources; |
350 |
+ |
while ((m = (sn + ncnts) >> 1) != l) { |
351 |
+ |
if (cntord[m].brt > 0.0) |
352 |
+ |
sn = m; |
353 |
+ |
else |
354 |
+ |
ncnts = m; |
355 |
+ |
l = m; |
356 |
+ |
} |
357 |
+ |
} |
358 |
+ |
/* accumulate tail */ |
359 |
+ |
for (sn = ncnts-1; sn > 0; sn--) |
360 |
+ |
cntord[sn-1].brt += cntord[sn].brt; |
361 |
+ |
/* start with prob=.5 */ |
362 |
+ |
hit2 = 0.5; test2 = 1.0; |
363 |
+ |
/* test for shadows */ |
364 |
+ |
for (sn = 0; sn < ncnts; sn++) { |
365 |
+ |
/* check threshold */ |
366 |
+ |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
367 |
+ |
cntord[sn].brt-cntord[sn+nshadcheck].brt) < |
368 |
+ |
ourthresh*bright(r->rcol)) |
369 |
+ |
break; |
370 |
+ |
/* get statistics */ |
371 |
+ |
hwt = (double)source[cntord[sn].sno].nhits / |
372 |
+ |
(double)source[cntord[sn].sno].ntests; |
373 |
+ |
test2 += hwt; |
374 |
+ |
source[cntord[sn].sno].ntests++; |
375 |
+ |
/* test for hit */ |
376 |
+ |
rayorigin(&sr, r, SHADOW, 1.0); |
377 |
+ |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
378 |
+ |
sr.rsrc = cntord[sn].sno; |
379 |
+ |
if (localhit(&sr, &thescene) && |
380 |
+ |
sr.ro != source[cntord[sn].sno].so) { |
381 |
+ |
/* check for transmission */ |
382 |
+ |
raycont(&sr); |
383 |
+ |
if (bright(sr.rcol) <= FTINY) |
384 |
+ |
continue; /* missed! */ |
385 |
+ |
(*f)(srccnt[cntord[sn].sno].val, p, |
386 |
+ |
srccnt[cntord[sn].sno].dir, |
387 |
+ |
srccnt[cntord[sn].sno].dom); |
388 |
+ |
multcolor(srccnt[cntord[sn].sno].val, sr.rcol); |
389 |
+ |
} |
390 |
+ |
/* add contribution if hit */ |
391 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
392 |
+ |
hit2 += hwt; |
393 |
+ |
source[cntord[sn].sno].nhits++; |
394 |
+ |
} |
395 |
+ |
/* weighted hit rate */ |
396 |
+ |
hwt = hit2 / test2; |
397 |
+ |
#ifdef DEBUG |
398 |
+ |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
399 |
+ |
sn, ncnts-sn, hwt); |
400 |
+ |
eputs(errmsg); |
401 |
+ |
#endif |
402 |
+ |
/* add in untested sources */ |
403 |
+ |
for ( ; sn < ncnts; sn++) { |
404 |
+ |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
405 |
+ |
(double)source[cntord[sn].sno].ntests; |
406 |
+ |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
407 |
+ |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
408 |
+ |
} |
409 |
+ |
|
410 |
+ |
free((char *)srccnt); |
411 |
+ |
free((char *)cntord); |
412 |
+ |
} |
413 |
+ |
|
414 |
+ |
|
415 |
|
#define wrongsource(m, r) (m->otype!=MAT_ILLUM && \ |
416 |
|
r->rsrc>=0 && \ |
417 |
< |
srcval[r->rsrc].so!=r->ro) |
417 |
> |
source[r->rsrc].so!=r->ro) |
418 |
|
|
419 |
|
#define badambient(m, r) ((r->crtype&(AMBIENT|SHADOW))==AMBIENT && \ |
420 |
|
!(r->rtype&REFLECTED) && /* hack! */\ |
421 |
|
!(m->otype==MAT_GLOW&&r->rot>m->oargs.farg[3])) |
422 |
|
|
423 |
|
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
424 |
< |
!(r->rsrc>=0&&srcval[r->rsrc].so==r->ro)) |
424 |
> |
!(r->rsrc>=0&&source[r->rsrc].so==r->ro)) |
425 |
|
|
426 |
|
|
427 |
|
m_light(m, r) /* ray hit a light source */ |
428 |
|
register OBJREC *m; |
429 |
|
register RAY *r; |
430 |
|
{ |
292 |
– |
/* check for behind */ |
293 |
– |
if (r->rod < 0.0) |
294 |
– |
return; |
431 |
|
/* check for over-counting */ |
432 |
|
if (wrongsource(m, r) || badambient(m, r)) |
433 |
|
return; |
441 |
|
|
442 |
|
/* otherwise treat as source */ |
443 |
|
} else { |
444 |
+ |
/* check for behind */ |
445 |
+ |
if (r->rod < 0.0) |
446 |
+ |
return; |
447 |
|
/* get distribution pattern */ |
448 |
|
raytexture(r, m->omod); |
449 |
|
/* get source color */ |
452 |
|
m->oargs.farg[2]); |
453 |
|
/* modify value */ |
454 |
|
multcolor(r->rcol, r->pcol); |
455 |
+ |
/* assign distance */ |
456 |
+ |
r->rt = r->rot; |
457 |
|
} |
458 |
|
} |
318 |
– |
|
319 |
– |
|
320 |
– |
o_source() {} /* intersection with a source is done elsewhere */ |