1 |
– |
/* Copyright (c) 1993 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 |
|
* source.c - routines dealing with illumination sources. |
6 |
|
* |
7 |
< |
* 8/20/85 |
7 |
> |
* External symbols declared in source.h |
8 |
|
*/ |
9 |
|
|
10 |
+ |
#include "copyright.h" |
11 |
+ |
|
12 |
|
#include "ray.h" |
13 |
|
|
15 |
– |
#include "octree.h" |
16 |
– |
|
14 |
|
#include "otypes.h" |
15 |
|
|
16 |
|
#include "source.h" |
17 |
|
|
18 |
+ |
#include "random.h" |
19 |
+ |
|
20 |
+ |
extern double ssampdist; /* scatter sampling distance */ |
21 |
+ |
|
22 |
+ |
#ifndef MAXSSAMP |
23 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
24 |
+ |
#endif |
25 |
+ |
|
26 |
|
/* |
27 |
|
* Structures used by direct() |
28 |
|
*/ |
44 |
|
static int maxcntr = 0; /* size of contribution arrays */ |
45 |
|
|
46 |
|
|
47 |
+ |
void |
48 |
|
marksources() /* find and mark source objects */ |
49 |
|
{ |
50 |
|
int foundsource = 0; |
54 |
|
/* initialize dispatch table */ |
55 |
|
initstypes(); |
56 |
|
/* find direct sources */ |
57 |
< |
for (i = 0; i < nobjects; i++) { |
57 |
> |
for (i = 0; i < nsceneobjs; i++) { |
58 |
|
|
59 |
|
o = objptr(i); |
60 |
|
|
74 |
|
o->otype != OBJ_SOURCE && |
75 |
|
m->oargs.farg[3] <= FTINY) |
76 |
|
continue; /* don't bother */ |
77 |
+ |
if (m->oargs.farg[0] <= FTINY && m->oargs.farg[1] <= FTINY && |
78 |
+ |
m->oargs.farg[2] <= FTINY) |
79 |
+ |
continue; /* don't bother */ |
80 |
|
|
81 |
|
if (sfun[o->otype].of == NULL || |
82 |
|
sfun[o->otype].of->setsrc == NULL) |
115 |
|
maxcntr = nsources + MAXSPART; /* start with this many */ |
116 |
|
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
117 |
|
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
118 |
< |
if (srccnt == NULL | cntord == NULL) |
118 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
119 |
|
goto memerr; |
120 |
|
return; |
121 |
|
memerr: |
123 |
|
} |
124 |
|
|
125 |
|
|
126 |
+ |
void |
127 |
+ |
freesources() /* free all source structures */ |
128 |
+ |
{ |
129 |
+ |
if (nsources > 0) { |
130 |
+ |
free((void *)source); |
131 |
+ |
source = NULL; |
132 |
+ |
nsources = 0; |
133 |
+ |
} |
134 |
+ |
if (maxcntr <= 0) |
135 |
+ |
return; |
136 |
+ |
free((void *)srccnt); |
137 |
+ |
srccnt = NULL; |
138 |
+ |
free((void *)cntord); |
139 |
+ |
cntord = NULL; |
140 |
+ |
maxcntr = 0; |
141 |
+ |
} |
142 |
+ |
|
143 |
+ |
|
144 |
+ |
int |
145 |
|
srcray(sr, r, si) /* send a ray to a source, return domega */ |
146 |
|
register RAY *sr; /* returned source ray */ |
147 |
|
RAY *r; /* ray which hit object */ |
156 |
|
sr->rsrc = si->sn; /* remember source */ |
157 |
|
srcp = source + si->sn; |
158 |
|
if (srcp->sflags & SDISTANT) { |
159 |
< |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
159 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s)) |
160 |
|
continue; |
161 |
|
return(1); /* sample OK */ |
162 |
|
} |
166 |
|
continue; |
167 |
|
/* check angle */ |
168 |
|
if (srcp->sflags & SSPOT) { |
169 |
< |
if (spotout(sr, srcp->sl.s, 0)) |
169 |
> |
if (spotout(sr, srcp->sl.s)) |
170 |
|
continue; |
171 |
|
/* adjust solid angle */ |
172 |
|
si->dom *= d*d; |
179 |
|
} |
180 |
|
|
181 |
|
|
182 |
+ |
void |
183 |
|
srcvalue(r) /* punch ray to source and compute value */ |
184 |
< |
RAY *r; |
184 |
> |
register RAY *r; |
185 |
|
{ |
186 |
|
register SRCREC *sp; |
187 |
|
|
190 |
|
/* check intersection */ |
191 |
|
if (!(*ofun[sp->so->otype].funp)(sp->so, r)) |
192 |
|
return; |
193 |
< |
raycont(r); /* compute contribution */ |
193 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
194 |
> |
goto nomat; |
195 |
> |
rayparticipate(r); |
196 |
|
return; |
197 |
|
} |
198 |
|
/* compute intersection */ |
200 |
|
(*ofun[sp->so->otype].funp)(sp->so, r)) { |
201 |
|
if (sp->sa.success >= 0) |
202 |
|
sp->sa.success++; |
203 |
< |
raycont(r); /* compute contribution */ |
203 |
> |
if (!rayshade(r, r->ro->omod)) /* compute contribution */ |
204 |
> |
goto nomat; |
205 |
> |
rayparticipate(r); |
206 |
|
return; |
207 |
|
} |
208 |
+ |
/* we missed our mark! */ |
209 |
|
if (sp->sa.success < 0) |
210 |
|
return; /* bitched already */ |
211 |
|
sp->sa.success -= AIMREQT; |
214 |
|
sprintf(errmsg, "aiming failure for light source \"%s\"", |
215 |
|
sp->so->oname); |
216 |
|
error(WARNING, errmsg); /* issue warning */ |
217 |
+ |
return; |
218 |
+ |
nomat: |
219 |
+ |
objerror(r->ro, USER, "material not found"); |
220 |
|
} |
221 |
|
|
222 |
|
|
223 |
+ |
int |
224 |
|
sourcehit(r) /* check to see if ray hit distant source */ |
225 |
|
register RAY *r; |
226 |
|
{ |
246 |
|
} |
247 |
|
|
248 |
|
if (r->ro != NULL) { |
249 |
+ |
r->robj = objndx(r->ro); |
250 |
|
for (i = 0; i < 3; i++) |
251 |
|
r->ron[i] = -r->rdir[i]; |
252 |
|
r->rod = 1.0; |
253 |
+ |
r->pert[0] = r->pert[1] = r->pert[2] = 0.0; |
254 |
+ |
r->uv[0] = r->uv[1] = 0.0; |
255 |
|
r->rox = NULL; |
256 |
|
return(1); |
257 |
|
} |
271 |
|
} |
272 |
|
|
273 |
|
|
274 |
+ |
void |
275 |
|
direct(r, f, p) /* add direct component */ |
276 |
|
RAY *r; /* ray that hit surface */ |
277 |
< |
int (*f)(); /* direct component coefficient function */ |
277 |
> |
void (*f)(); /* direct component coefficient function */ |
278 |
|
char *p; /* data for f */ |
279 |
|
{ |
280 |
< |
extern int (*trace)(); |
280 |
> |
extern void (*trace)(); |
281 |
|
register int sn; |
282 |
|
register CONTRIB *scp; |
283 |
|
SRCINDEX si; |
293 |
|
for (sn = 0; srcray(&sr, r, &si); sn++) { |
294 |
|
if (sn >= maxcntr) { |
295 |
|
maxcntr = sn + MAXSPART; |
296 |
< |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
296 |
> |
srccnt = (CONTRIB *)realloc((void *)srccnt, |
297 |
|
maxcntr*sizeof(CONTRIB)); |
298 |
< |
cntord = (CNTPTR *)realloc((char *)cntord, |
298 |
> |
cntord = (CNTPTR *)realloc((void *)cntord, |
299 |
|
maxcntr*sizeof(CNTPTR)); |
300 |
< |
if (srccnt == NULL | cntord == NULL) |
300 |
> |
if ((srccnt == NULL) | (cntord == NULL)) |
301 |
|
error(SYSTEM, "out of memory in direct"); |
302 |
|
} |
303 |
|
cntord[sn].sndx = sn; |
341 |
|
/* modify threshold */ |
342 |
|
ourthresh = shadthresh / r->rweight; |
343 |
|
/* test for shadows */ |
344 |
< |
nhits = 0; |
345 |
< |
for (sn = 0; sn < ncnts; sn++) { |
344 |
> |
for (nhits = 0, hwt = 0.0, sn = 0; sn < ncnts; |
345 |
> |
hwt += (double)source[scp->sno].nhits / |
346 |
> |
(double)source[scp->sno].ntests, |
347 |
> |
sn++) { |
348 |
|
/* check threshold */ |
349 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
350 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
355 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
356 |
|
VCOPY(sr.rdir, scp->dir); |
357 |
|
sr.rsrc = scp->sno; |
358 |
< |
source[scp->sno].ntests++; /* keep statistics */ |
358 |
> |
/* keep statistics */ |
359 |
> |
if (source[scp->sno].ntests++ > 0xfffffff0) { |
360 |
> |
source[scp->sno].ntests >>= 1; |
361 |
> |
source[scp->sno].nhits >>= 1; |
362 |
> |
} |
363 |
|
if (localhit(&sr, &thescene) && |
364 |
|
( sr.ro != source[scp->sno].so || |
365 |
|
source[scp->sno].sflags & SFOLLOW )) { |
366 |
|
/* follow entire path */ |
367 |
|
raycont(&sr); |
368 |
+ |
rayparticipate(&sr); |
369 |
|
if (trace != NULL) |
370 |
|
(*trace)(&sr); /* trace execution */ |
371 |
|
if (bright(sr.rcol) <= FTINY) |
378 |
|
nhits++; |
379 |
|
source[scp->sno].nhits++; |
380 |
|
} |
381 |
< |
/* surface hit rate */ |
382 |
< |
if (sn > 0) |
383 |
< |
hwt = (double)nhits / (double)sn; |
381 |
> |
/* source hit rate */ |
382 |
> |
if (hwt > FTINY) |
383 |
> |
hwt = (double)nhits / hwt; |
384 |
|
else |
385 |
|
hwt = 0.5; |
386 |
|
#ifdef DEBUG |
387 |
< |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
387 |
> |
sprintf(errmsg, "%d tested, %d untested, %f conditional hit rate\n", |
388 |
|
sn, ncnts-sn, hwt); |
389 |
|
eputs(errmsg); |
390 |
|
#endif |
393 |
|
scp = srccnt + cntord[sn].sndx; |
394 |
|
prob = hwt * (double)source[scp->sno].nhits / |
395 |
|
(double)source[scp->sno].ntests; |
396 |
+ |
if (prob > 1.0) |
397 |
+ |
prob = 1.0; |
398 |
|
scalecolor(scp->val, prob); |
399 |
|
addcolor(r->rcol, scp->val); |
400 |
|
} |
401 |
|
} |
402 |
|
|
403 |
|
|
404 |
+ |
void |
405 |
+ |
srcscatter(r) /* compute source scattering into ray */ |
406 |
+ |
register RAY *r; |
407 |
+ |
{ |
408 |
+ |
int oldsampndx; |
409 |
+ |
int nsamps; |
410 |
+ |
RAY sr; |
411 |
+ |
SRCINDEX si; |
412 |
+ |
double t, d; |
413 |
+ |
double re, ge, be; |
414 |
+ |
COLOR cvext; |
415 |
+ |
int i, j; |
416 |
+ |
|
417 |
+ |
if (r->slights == NULL || r->slights[0] == 0 |
418 |
+ |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
419 |
+ |
return; |
420 |
+ |
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
421 |
+ |
nsamps = 1; |
422 |
+ |
#if MAXSSAMP |
423 |
+ |
else if (nsamps > MAXSSAMP) |
424 |
+ |
nsamps = MAXSSAMP; |
425 |
+ |
#endif |
426 |
+ |
oldsampndx = samplendx; |
427 |
+ |
samplendx = random()&0x7fff; /* randomize */ |
428 |
+ |
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
429 |
+ |
for (j = 0; j < nsamps; j++) { /* for each sample position */ |
430 |
+ |
samplendx++; |
431 |
+ |
t = r->rot * (j+frandom())/nsamps; |
432 |
+ |
/* extinction */ |
433 |
+ |
re = t*colval(r->cext,RED); |
434 |
+ |
ge = t*colval(r->cext,GRN); |
435 |
+ |
be = t*colval(r->cext,BLU); |
436 |
+ |
setcolor(cvext, re > 92. ? 0. : exp(-re), |
437 |
+ |
ge > 92. ? 0. : exp(-ge), |
438 |
+ |
be > 92. ? 0. : exp(-be)); |
439 |
+ |
if (intens(cvext) <= FTINY) |
440 |
+ |
break; /* too far away */ |
441 |
+ |
sr.rorg[0] = r->rorg[0] + r->rdir[0]*t; |
442 |
+ |
sr.rorg[1] = r->rorg[1] + r->rdir[1]*t; |
443 |
+ |
sr.rorg[2] = r->rorg[2] + r->rdir[2]*t; |
444 |
+ |
sr.rmax = 0.; |
445 |
+ |
initsrcindex(&si); /* sample ray to this source */ |
446 |
+ |
si.sn = r->slights[i]; |
447 |
+ |
nopart(&si, &sr); |
448 |
+ |
if (!srcray(&sr, NULL, &si) || |
449 |
+ |
sr.rsrc != r->slights[i]) |
450 |
+ |
continue; /* no path */ |
451 |
+ |
copycolor(sr.cext, r->cext); |
452 |
+ |
copycolor(sr.albedo, r->albedo); |
453 |
+ |
sr.gecc = r->gecc; |
454 |
+ |
sr.slights = r->slights; |
455 |
+ |
rayvalue(&sr); /* eval. source ray */ |
456 |
+ |
if (bright(sr.rcol) <= FTINY) |
457 |
+ |
continue; |
458 |
+ |
if (r->gecc <= FTINY) /* compute P(theta) */ |
459 |
+ |
d = 1.; |
460 |
+ |
else { |
461 |
+ |
d = DOT(r->rdir, sr.rdir); |
462 |
+ |
d = 1. + r->gecc*r->gecc - 2.*r->gecc*d; |
463 |
+ |
d = (1. - r->gecc*r->gecc) / (d*sqrt(d)); |
464 |
+ |
} |
465 |
+ |
/* other factors */ |
466 |
+ |
d *= si.dom * r->rot / (4.*PI*nsamps); |
467 |
+ |
multcolor(sr.rcol, r->cext); |
468 |
+ |
multcolor(sr.rcol, r->albedo); |
469 |
+ |
scalecolor(sr.rcol, d); |
470 |
+ |
multcolor(sr.rcol, cvext); |
471 |
+ |
addcolor(r->rcol, sr.rcol); /* add it in */ |
472 |
+ |
} |
473 |
+ |
} |
474 |
+ |
samplendx = oldsampndx; |
475 |
+ |
} |
476 |
+ |
|
477 |
+ |
|
478 |
|
/**************************************************************** |
479 |
|
* The following macros were separated from the m_light() routine |
480 |
|
* because they are very nasty and difficult to understand. |
493 |
|
|
494 |
|
static int weaksrcmod(obj) int obj; /* efficiency booster function */ |
495 |
|
{register OBJREC *o = objptr(obj); |
496 |
< |
return(o->otype==MAT_ILLUM|o->otype==MAT_GLOW);} |
496 |
> |
return((o->otype==MAT_ILLUM)|(o->otype==MAT_GLOW));} |
497 |
|
|
498 |
|
#define illumblock(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
499 |
|
r->rod > 0.0 && \ |
516 |
|
* (Glows with negative radii should NEVER participate in illumination.) |
517 |
|
*/ |
518 |
|
|
519 |
< |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
519 |
> |
#define distglow(m, r, d) (m->otype==MAT_GLOW && \ |
520 |
|
m->oargs.farg[3] >= -FTINY && \ |
521 |
< |
r->rot > m->oargs.farg[3]) |
521 |
> |
d > m->oargs.farg[3]) |
522 |
|
|
523 |
|
/* badcomponent * |
524 |
|
* |
531 |
|
|
532 |
|
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
533 |
|
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
534 |
< |
distglow(m, r))) |
534 |
> |
/* not 100% correct */ distglow(m, r, r->rot))) |
535 |
|
|
536 |
|
/* passillum * |
537 |
|
* |
549 |
|
* The -dv flag is normally on for sources to be visible. |
550 |
|
*/ |
551 |
|
|
552 |
< |
#define srcignore(m, r) (!directvis && !(r->crtype&SHADOW) && \ |
553 |
< |
!distglow(m, r)) |
552 |
> |
#define srcignore(m, r) !(directvis || r->crtype&SHADOW || \ |
553 |
> |
distglow(m, r, raydist(r,PRIMARY))) |
554 |
|
|
555 |
|
|
556 |
+ |
int |
557 |
|
m_light(m, r) /* ray hit a light source */ |
558 |
|
register OBJREC *m; |
559 |
|
register RAY *r; |
560 |
|
{ |
561 |
|
/* check for over-counting */ |
562 |
|
if (badcomponent(m, r)) |
563 |
< |
return; |
564 |
< |
if (wrongsource(m,r)) |
565 |
< |
return; |
563 |
> |
return(1); |
564 |
> |
if (wrongsource(m, r)) |
565 |
> |
return(1); |
566 |
|
/* check for passed illum */ |
567 |
|
if (passillum(m, r)) { |
568 |
< |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
569 |
< |
raytrans(r); |
570 |
< |
else |
571 |
< |
rayshade(r, modifier(m->oargs.sarg[0])); |
446 |
< |
return; |
568 |
> |
if (m->oargs.nsargs && strcmp(m->oargs.sarg[0], VOIDID)) |
569 |
> |
return(rayshade(r,lastmod(objndx(m),m->oargs.sarg[0]))); |
570 |
> |
raytrans(r); |
571 |
> |
return(1); |
572 |
|
} |
573 |
|
/* otherwise treat as source */ |
574 |
|
/* check for behind */ |
575 |
|
if (r->rod < 0.0) |
576 |
< |
return; |
576 |
> |
return(1); |
577 |
|
/* check for invisibility */ |
578 |
|
if (srcignore(m, r)) |
579 |
< |
return; |
579 |
> |
return(1); |
580 |
|
/* check for outside spot */ |
581 |
< |
if (m->otype==MAT_SPOT && spotout(r, makespot(m), r->rot>=FHUGE)) |
582 |
< |
return; |
581 |
> |
if (m->otype==MAT_SPOT && spotout(r, makespot(m))) |
582 |
> |
return(1); |
583 |
|
/* get distribution pattern */ |
584 |
|
raytexture(r, m->omod); |
585 |
|
/* get source color */ |
588 |
|
m->oargs.farg[2]); |
589 |
|
/* modify value */ |
590 |
|
multcolor(r->rcol, r->pcol); |
591 |
+ |
return(1); |
592 |
|
} |