1 |
< |
/* Copyright (c) 1992 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1995 Regents of the University of California */ |
2 |
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|
3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
18 |
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|
19 |
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#include "source.h" |
20 |
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|
21 |
+ |
#include "random.h" |
22 |
+ |
|
23 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
24 |
+ |
|
25 |
+ |
#ifndef MAXSSAMP |
26 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
27 |
+ |
#endif |
28 |
+ |
|
29 |
|
/* |
30 |
|
* Structures used by direct() |
31 |
|
*/ |
76 |
|
o->otype != OBJ_SOURCE && |
77 |
|
m->oargs.farg[3] <= FTINY) |
78 |
|
continue; /* don't bother */ |
79 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
80 |
+ |
m->oargs.farg[2] <= FTINY) |
81 |
+ |
continue; /* don't bother */ |
82 |
|
|
83 |
|
if (sfun[o->otype].of == NULL || |
84 |
|
sfun[o->otype].of->setsrc == NULL) |
92 |
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if (m->otype == MAT_GLOW) { |
93 |
|
source[ns].sflags |= SPROX; |
94 |
|
source[ns].sl.prox = m->oargs.farg[3]; |
95 |
< |
if (o->otype == OBJ_SOURCE) |
95 |
> |
if (source[ns].sflags & SDISTANT) |
96 |
|
source[ns].sflags |= SSKIP; |
97 |
|
} else if (m->otype == MAT_SPOT) { |
98 |
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source[ns].sflags |= SSPOT; |
139 |
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sr->rsrc = si->sn; /* remember source */ |
140 |
|
srcp = source + si->sn; |
141 |
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if (srcp->sflags & SDISTANT) { |
142 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
142 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
143 |
|
continue; |
144 |
|
return(1); /* sample OK */ |
145 |
|
} |
149 |
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continue; |
150 |
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/* check angle */ |
151 |
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if (srcp->sflags & SSPOT) { |
152 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
152 |
> |
if (spotout(sr, srcp->sl.s)) |
153 |
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continue; |
154 |
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/* adjust solid angle */ |
155 |
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si->dom *= d*d; |
163 |
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|
164 |
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|
165 |
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srcvalue(r) /* punch ray to source and compute value */ |
166 |
< |
RAY *r; |
166 |
> |
register RAY *r; |
167 |
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{ |
168 |
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register SRCREC *sp; |
169 |
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|
172 |
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/* check intersection */ |
173 |
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if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
174 |
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return; |
175 |
< |
raycont(r); /* compute contribution */ |
175 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
176 |
> |
goto nomat; |
177 |
> |
rayparticipate(r); |
178 |
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return; |
179 |
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} |
180 |
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/* compute intersection */ |
182 |
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(*ofun[sp->so->otype].funp)(sp->so, r)) { |
183 |
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if (sp->sa.success >= 0) |
184 |
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sp->sa.success++; |
185 |
< |
raycont(r); /* compute contribution */ |
185 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
186 |
> |
goto nomat; |
187 |
> |
rayparticipate(r); |
188 |
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return; |
189 |
|
} |
190 |
+ |
/* we missed our mark! */ |
191 |
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if (sp->sa.success < 0) |
192 |
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return; /* bitched already */ |
193 |
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sp->sa.success -= AIMREQT; |
196 |
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sprintf(errmsg, "aiming failure for light source \"%s\"", |
197 |
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sp->so->oname); |
198 |
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error(WARNING, errmsg); /* issue warning */ |
199 |
+ |
return; |
200 |
+ |
nomat: |
201 |
+ |
objerror(r->ro, USER, "material not found"); |
202 |
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} |
203 |
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|
204 |
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|
227 |
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} |
228 |
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|
229 |
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if (r->ro != NULL) { |
230 |
+ |
r->robj = objndx(r->ro); |
231 |
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for (i = 0; i < 3; i++) |
232 |
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r->ron[i] = -r->rdir[i]; |
233 |
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r->rod = 1.0; |
257 |
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{ |
258 |
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extern int (*trace)(); |
259 |
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register int sn; |
260 |
+ |
register CONTRIB *scp; |
261 |
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SRCINDEX si; |
262 |
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int nshadcheck, ncnts; |
263 |
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int nhits; |
279 |
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error(SYSTEM, "out of memory in direct"); |
280 |
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} |
281 |
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cntord[sn].sndx = sn; |
282 |
< |
srccnt[sn].sno = sr.rsrc; |
282 |
> |
scp = srccnt + sn; |
283 |
> |
scp->sno = sr.rsrc; |
284 |
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/* compute coefficient */ |
285 |
< |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
286 |
< |
cntord[sn].brt = bright(srccnt[sn].coef); |
285 |
> |
(*f)(scp->coef, p, sr.rdir, si.dom); |
286 |
> |
cntord[sn].brt = bright(scp->coef); |
287 |
|
if (cntord[sn].brt <= 0.0) |
288 |
|
continue; |
289 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
289 |
> |
VCOPY(scp->dir, sr.rdir); |
290 |
|
/* compute potential */ |
291 |
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sr.revf = srcvalue; |
292 |
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rayvalue(&sr); |
293 |
< |
copycolor(srccnt[sn].val, sr.rcol); |
294 |
< |
multcolor(srccnt[sn].val, srccnt[sn].coef); |
295 |
< |
cntord[sn].brt = bright(srccnt[sn].val); |
293 |
> |
copycolor(scp->val, sr.rcol); |
294 |
> |
multcolor(scp->val, scp->coef); |
295 |
> |
cntord[sn].brt = bright(scp->val); |
296 |
|
} |
297 |
|
/* sort contributions */ |
298 |
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qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
319 |
|
/* modify threshold */ |
320 |
|
ourthresh = shadthresh / r->rweight; |
321 |
|
/* test for shadows */ |
322 |
< |
nhits = 0; |
323 |
< |
for (sn = 0; sn < ncnts; sn++) { |
322 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
323 |
> |
hwt += (double)source[scp->sno].nhits / |
324 |
> |
(double)source[scp->sno].ntests, |
325 |
> |
sn++) { |
326 |
|
/* check threshold */ |
327 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
328 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
329 |
|
< ourthresh*bright(r->rcol)) |
330 |
|
break; |
331 |
+ |
scp = srccnt + cntord[sn].sndx; |
332 |
|
/* test for hit */ |
333 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
334 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
335 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
336 |
< |
source[sr.rsrc].ntests++; /* keep statistics */ |
334 |
> |
VCOPY(sr.rdir, scp->dir); |
335 |
> |
sr.rsrc = scp->sno; |
336 |
> |
source[scp->sno].ntests++; /* keep statistics */ |
337 |
|
if (localhit(&sr, &thescene) && |
338 |
< |
( sr.ro != source[sr.rsrc].so || |
339 |
< |
source[sr.rsrc].sflags & SFOLLOW )) { |
338 |
> |
( sr.ro != source[scp->sno].so || |
339 |
> |
source[scp->sno].sflags & SFOLLOW )) { |
340 |
|
/* follow entire path */ |
341 |
|
raycont(&sr); |
342 |
+ |
rayparticipate(&sr); |
343 |
|
if (trace != NULL) |
344 |
|
(*trace)(&sr); /* trace execution */ |
345 |
|
if (bright(sr.rcol) <= FTINY) |
346 |
|
continue; /* missed! */ |
347 |
< |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
348 |
< |
multcolor(srccnt[cntord[sn].sndx].val, |
323 |
< |
srccnt[cntord[sn].sndx].coef); |
347 |
> |
copycolor(scp->val, sr.rcol); |
348 |
> |
multcolor(scp->val, scp->coef); |
349 |
|
} |
350 |
|
/* add contribution if hit */ |
351 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
351 |
> |
addcolor(r->rcol, scp->val); |
352 |
|
nhits++; |
353 |
< |
source[sr.rsrc].nhits++; |
353 |
> |
source[scp->sno].nhits++; |
354 |
|
} |
355 |
< |
/* surface hit rate */ |
356 |
< |
if (sn > 0) |
357 |
< |
hwt = (double)nhits / (double)sn; |
355 |
> |
/* source hit rate */ |
356 |
> |
if (hwt > FTINY) |
357 |
> |
hwt = (double)nhits / hwt; |
358 |
|
else |
359 |
|
hwt = 0.5; |
360 |
|
#ifdef DEBUG |
361 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
361 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
362 |
|
sn, ncnts-sn, hwt); |
363 |
|
eputs(errmsg); |
364 |
|
#endif |
365 |
|
/* add in untested sources */ |
366 |
|
for ( ; sn < ncnts; sn++) { |
367 |
< |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
368 |
< |
prob = hwt * (double)source[sr.rsrc].nhits / |
369 |
< |
(double)source[sr.rsrc].ntests; |
370 |
< |
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
371 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
367 |
> |
scp = srccnt + cntord[sn].sndx; |
368 |
> |
prob = hwt * (double)source[scp->sno].nhits / |
369 |
> |
(double)source[scp->sno].ntests; |
370 |
> |
if (prob > 1.0) |
371 |
> |
prob = 1.0; |
372 |
> |
scalecolor(scp->val, prob); |
373 |
> |
addcolor(r->rcol, scp->val); |
374 |
|
} |
375 |
|
} |
376 |
|
|
377 |
|
|
378 |
+ |
srcscatter(r) /* compute source scattering into ray */ |
379 |
+ |
register RAY *r; |
380 |
+ |
{ |
381 |
+ |
int oldsampndx; |
382 |
+ |
int nsamps; |
383 |
+ |
RAY sr; |
384 |
+ |
SRCINDEX si; |
385 |
+ |
double t, d; |
386 |
+ |
double re, ge, be; |
387 |
+ |
COLOR cvext; |
388 |
+ |
int i, j; |
389 |
+ |
|
390 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
391 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
392 |
+ |
return; |
393 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
394 |
+ |
nsamps = 1; |
395 |
+ |
#if MAXSSAMP |
396 |
+ |
else if (nsamps > MAXSSAMP) |
397 |
+ |
nsamps = MAXSSAMP; |
398 |
+ |
#endif |
399 |
+ |
oldsampndx = samplendx; |
400 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
401 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
402 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
403 |
+ |
samplendx++; |
404 |
+ |
t = r->rot * (j+frandom())/nsamps; |
405 |
+ |
/* extinction */ |
406 |
+ |
re = t*colval(r->cext,RED); |
407 |
+ |
ge = t*colval(r->cext,GRN); |
408 |
+ |
be = t*colval(r->cext,BLU); |
409 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
410 |
+ |
ge > 92. ? 0. : exp(-ge), |
411 |
+ |
be > 92. ? 0. : exp(-be)); |
412 |
+ |
if (intens(cvext) <= FTINY) |
413 |
+ |
break; /* too far away */ |
414 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
415 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
416 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
417 |
+ |
sr.rmax = 0.; |
418 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
419 |
+ |
si.sn = r->slights[i]; |
420 |
+ |
nopart(&si, &sr); |
421 |
+ |
if (!srcray(&sr, NULL, &si) || |
422 |
+ |
sr.rsrc != r->slights[i]) |
423 |
+ |
continue; /* no path */ |
424 |
+ |
copycolor(sr.cext, r->cext); |
425 |
+ |
copycolor(sr.albedo, r->albedo); |
426 |
+ |
sr.gecc = r->gecc; |
427 |
+ |
sr.slights = r->slights; |
428 |
+ |
rayvalue(&sr); /* eval. source ray */ |
429 |
+ |
if (bright(sr.rcol) <= FTINY) |
430 |
+ |
continue; |
431 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
432 |
+ |
d = 1.; |
433 |
+ |
else { |
434 |
+ |
d = DOT(r->rdir, sr.rdir); |
435 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
436 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
437 |
+ |
} |
438 |
+ |
/* other factors */ |
439 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
440 |
+ |
multcolor(sr.rcol, r->cext); |
441 |
+ |
multcolor(sr.rcol, r->albedo); |
442 |
+ |
scalecolor(sr.rcol, d); |
443 |
+ |
multcolor(sr.rcol, cvext); |
444 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
445 |
+ |
} |
446 |
+ |
} |
447 |
+ |
samplendx = oldsampndx; |
448 |
+ |
} |
449 |
+ |
|
450 |
+ |
|
451 |
|
/**************************************************************** |
452 |
|
* The following macros were separated from the m_light() routine |
453 |
|
* because they are very nasty and difficult to understand. |
454 |
|
*/ |
455 |
|
|
456 |
< |
/* wrongillum * |
456 |
> |
/* illumblock * |
457 |
|
* |
458 |
|
* We cannot allow an illum to pass to another illum, because that |
459 |
|
* would almost certainly constitute overcounting. |
460 |
|
* However, we do allow an illum to pass to another illum |
461 |
|
* that is actually going to relay to a virtual light source. |
462 |
+ |
* We also prevent an illum from passing to a glow; this provides a |
463 |
+ |
* convenient mechanism for defining detailed light source |
464 |
+ |
* geometry behind (or inside) an effective radiator. |
465 |
|
*/ |
466 |
|
|
467 |
< |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
468 |
< |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
467 |
> |
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
468 |
> |
{register OBJREC *o = objptr(obj); |
469 |
> |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
470 |
|
|
471 |
+ |
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
472 |
+ |
r->rod > 0.0 && \ |
473 |
+ |
weaksrcmod(source[r->rsrc].so->omod)) |
474 |
+ |
|
475 |
|
/* wrongsource * |
476 |
|
* |
477 |
|
* This source is the wrong source (ie. overcounted) if we are |
478 |
|
* aimed to a different source than the one we hit and the one |
479 |
< |
* we hit is not an illum which should be passed. |
479 |
> |
* we hit is not an illum that should be passed. |
480 |
|
*/ |
481 |
|
|
482 |
|
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
483 |
< |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
483 |
> |
(m->otype!=MAT_ILLUM || illumblock(m,r))) |
484 |
|
|
485 |
|
/* distglow * |
486 |
|
* |
487 |
|
* A distant glow is an object that sometimes acts as a light source, |
488 |
|
* but is too far away from the test point to be one in this case. |
489 |
+ |
* (Glows with negative radii should NEVER participate in illumination.) |
490 |
|
*/ |
491 |
|
|
492 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
493 |
< |
r->rot > m->oargs.farg[3]) |
492 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
493 |
> |
m->oargs.farg[3] >= -FTINY && \ |
494 |
> |
d > m->oargs.farg[3]) |
495 |
|
|
496 |
|
/* badcomponent * |
497 |
|
* |
504 |
|
|
505 |
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
506 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
507 |
< |
distglow(m, r))) |
507 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
508 |
|
|
399 |
– |
/* overcount * |
400 |
– |
* |
401 |
– |
* All overcounting possibilities are contained here. |
402 |
– |
*/ |
403 |
– |
|
404 |
– |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
405 |
– |
|
509 |
|
/* passillum * |
510 |
|
* |
511 |
|
* An illum passes to another material type when we didn't hit it |
519 |
|
|
520 |
|
/* srcignore * |
521 |
|
* |
522 |
< |
* The -di flag renders light sources invisible, and here is the test. |
522 |
> |
* The -dv flag is normally on for sources to be visible. |
523 |
|
*/ |
524 |
|
|
525 |
< |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
526 |
< |
!distglow(m, r)) |
525 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
526 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
527 |
|
|
528 |
|
|
529 |
|
m_light(m, r) /* ray hit a light source */ |
531 |
|
register RAY *r; |
532 |
|
{ |
533 |
|
/* check for over-counting */ |
534 |
< |
if (overcount(m, r)) |
535 |
< |
return; |
534 |
> |
if (badcomponent(m, r)) |
535 |
> |
return(1); |
536 |
> |
if (wrongsource(m, r)) |
537 |
> |
return(1); |
538 |
|
/* check for passed illum */ |
539 |
|
if (passillum(m, r)) { |
540 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
541 |
< |
raytrans(r); |
542 |
< |
else |
543 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
439 |
< |
return; |
540 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
541 |
> |
return(rayshade(r, modifier(m->oargs.sarg[0]))); |
542 |
> |
raytrans(r); |
543 |
> |
return(1); |
544 |
|
} |
545 |
|
/* otherwise treat as source */ |
546 |
|
/* check for behind */ |
547 |
|
if (r->rod < 0.0) |
548 |
< |
return; |
548 |
> |
return(1); |
549 |
|
/* check for invisibility */ |
550 |
|
if (srcignore(m, r)) |
551 |
< |
return; |
551 |
> |
return(1); |
552 |
|
/* check for outside spot */ |
553 |
< |
if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
554 |
< |
return; |
553 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
554 |
> |
return(1); |
555 |
|
/* get distribution pattern */ |
556 |
|
raytexture(r, m->omod); |
557 |
|
/* get source color */ |
560 |
|
m->oargs.farg[2]); |
561 |
|
/* modify value */ |
562 |
|
multcolor(r->rcol, r->pcol); |
563 |
+ |
return(1); |
564 |
|
} |