1 |
< |
/* Copyright (c) 1990 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
18 |
|
|
19 |
|
#include "source.h" |
20 |
|
|
21 |
– |
#include "random.h" |
22 |
– |
|
21 |
|
/* |
22 |
|
* Structures used by direct() |
23 |
|
*/ |
24 |
|
|
25 |
|
typedef struct { |
26 |
+ |
int sno; /* source number */ |
27 |
|
FVECT dir; /* source direction */ |
28 |
|
COLOR coef; /* material coefficient */ |
29 |
|
COLOR val; /* contribution */ |
30 |
|
} CONTRIB; /* direct contribution */ |
31 |
|
|
32 |
|
typedef struct { |
33 |
< |
int sno; /* source number */ |
33 |
> |
int sndx; /* source index (to CONTRIB array) */ |
34 |
|
float brt; /* brightness (for comparison) */ |
35 |
|
} CNTPTR; /* contribution pointer */ |
36 |
|
|
37 |
|
static CONTRIB *srccnt; /* source contributions in direct() */ |
38 |
|
static CNTPTR *cntord; /* source ordering in direct() */ |
39 |
+ |
static int maxcntr = 0; /* size of contribution arrays */ |
40 |
|
|
41 |
|
|
42 |
|
marksources() /* find and mark source objects */ |
43 |
|
{ |
44 |
+ |
int foundsource = 0; |
45 |
|
int i; |
46 |
|
register OBJREC *o, *m; |
47 |
|
register int ns; |
94 |
|
source[ns].sflags |= SSKIP; |
95 |
|
} |
96 |
|
} |
97 |
+ |
if (!(source[ns].sflags & SSKIP)) |
98 |
+ |
foundsource++; |
99 |
|
} |
100 |
< |
if (nsources <= 0) { |
100 |
> |
if (!foundsource) { |
101 |
|
error(WARNING, "no light sources found"); |
102 |
|
return; |
103 |
|
} |
104 |
|
markvirtuals(); /* find and add virtual sources */ |
105 |
< |
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
106 |
< |
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
107 |
< |
if (srccnt == NULL || cntord == NULL) |
105 |
> |
/* allocate our contribution arrays */ |
106 |
> |
maxcntr = nsources + MAXSPART; /* start with this many */ |
107 |
> |
srccnt = (CONTRIB *)malloc(maxcntr*sizeof(CONTRIB)); |
108 |
> |
cntord = (CNTPTR *)malloc(maxcntr*sizeof(CNTPTR)); |
109 |
> |
if (srccnt == NULL | cntord == NULL) |
110 |
|
goto memerr; |
111 |
|
return; |
112 |
|
memerr: |
114 |
|
} |
115 |
|
|
116 |
|
|
117 |
< |
double |
113 |
< |
srcray(sr, r, sn) /* send a ray to a source, return domega */ |
117 |
> |
srcray(sr, r, si) /* send a ray to a source, return domega */ |
118 |
|
register RAY *sr; /* returned source ray */ |
119 |
|
RAY *r; /* ray which hit object */ |
120 |
< |
register int sn; /* source number */ |
120 |
> |
SRCINDEX *si; /* source sample index */ |
121 |
|
{ |
122 |
< |
double ddot; /* (distance times) cosine */ |
123 |
< |
FVECT vd; |
120 |
< |
double d; |
121 |
< |
register int i; |
122 |
> |
double d; /* distance to source */ |
123 |
> |
register SRCREC *srcp; |
124 |
|
|
125 |
< |
if (source[sn].sflags & SSKIP) |
124 |
< |
return(0.0); /* skip this source */ |
125 |
> |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
126 |
|
|
127 |
< |
rayorigin(sr, r, SHADOW, 1.0); /* ignore limits */ |
128 |
< |
|
129 |
< |
sr->rsrc = sn; /* remember source */ |
130 |
< |
/* get source direction */ |
131 |
< |
if (source[sn].sflags & SDISTANT) { |
132 |
< |
/* constant direction */ |
133 |
< |
VCOPY(sr->rdir, source[sn].sloc); |
133 |
< |
} else { /* compute direction */ |
134 |
< |
for (i = 0; i < 3; i++) |
135 |
< |
sr->rdir[i] = source[sn].sloc[i] - sr->rorg[i]; |
136 |
< |
|
137 |
< |
if (source[sn].sflags & SFLAT && |
138 |
< |
(ddot = -DOT(sr->rdir, source[sn].snorm)) <= FTINY) |
139 |
< |
return(0.0); /* behind surface! */ |
127 |
> |
while ((d = nextssamp(sr, si)) != 0.0) { |
128 |
> |
sr->rsrc = si->sn; /* remember source */ |
129 |
> |
srcp = source + si->sn; |
130 |
> |
if (srcp->sflags & SDISTANT) { |
131 |
> |
if (srcp->sflags & SSPOT && spotout(sr, srcp->sl.s, 1)) |
132 |
> |
continue; |
133 |
> |
return(1); /* sample OK */ |
134 |
|
} |
135 |
< |
if (dstrsrc > FTINY) { |
142 |
< |
/* distribute source direction */ |
143 |
< |
dimlist[ndims++] = sn; |
144 |
< |
for (i = 0; i < 3; i++) { |
145 |
< |
dimlist[ndims] = i + 8831; |
146 |
< |
vd[i] = dstrsrc * source[sn].ss * |
147 |
< |
(1.0 - 2.0*urand(urind(ilhash(dimlist,ndims+1),samplendx))); |
148 |
< |
} |
149 |
< |
ndims--; |
150 |
< |
if (source[sn].sflags & SFLAT) { /* project offset */ |
151 |
< |
d = DOT(vd, source[sn].snorm); |
152 |
< |
for (i = 0; i < 3; i++) |
153 |
< |
vd[i] -= d * source[sn].snorm[i]; |
154 |
< |
} |
155 |
< |
for (i = 0; i < 3; i++) /* offset source direction */ |
156 |
< |
sr->rdir[i] += vd[i]; |
157 |
< |
/* normalize */ |
158 |
< |
d = normalize(sr->rdir); |
159 |
< |
|
160 |
< |
} else if (!(source[sn].sflags & SDISTANT)) |
161 |
< |
/* normalize direction */ |
162 |
< |
d = normalize(sr->rdir); |
163 |
< |
|
164 |
< |
if (source[sn].sflags & SDISTANT) { |
165 |
< |
if (source[sn].sflags & SSPOT) { /* check location */ |
166 |
< |
for (i = 0; i < 3; i++) |
167 |
< |
vd[i] = source[sn].sl.s->aim[i] - sr->rorg[i]; |
168 |
< |
d = DOT(sr->rdir,vd); |
169 |
< |
if (d <= FTINY) |
170 |
< |
return(0.0); |
171 |
< |
d = DOT(vd,vd) - d*d; |
172 |
< |
if (PI*d > source[sn].sl.s->siz) |
173 |
< |
return(0.0); |
174 |
< |
} |
175 |
< |
return(source[sn].ss2); /* domega constant */ |
176 |
< |
} |
177 |
< |
/* check direction */ |
178 |
< |
if (d == 0.0) |
179 |
< |
return(0.0); |
135 |
> |
/* local source */ |
136 |
|
/* check proximity */ |
137 |
< |
if (source[sn].sflags & SPROX && |
138 |
< |
d > source[sn].sl.prox) |
183 |
< |
return(0.0); |
184 |
< |
/* compute dot product */ |
185 |
< |
if (source[sn].sflags & SFLAT) |
186 |
< |
ddot /= d; |
187 |
< |
else |
188 |
< |
ddot = 1.0; |
137 |
> |
if (srcp->sflags & SPROX && d > srcp->sl.prox) |
138 |
> |
continue; |
139 |
|
/* check angle */ |
140 |
< |
if (source[sn].sflags & SSPOT) { |
141 |
< |
if (source[sn].sl.s->siz < 2.0*PI * |
142 |
< |
(1.0 + DOT(source[sn].sl.s->aim,sr->rdir))) |
143 |
< |
return(0.0); |
144 |
< |
d += source[sn].sl.s->flen; /* adjust length */ |
140 |
> |
if (srcp->sflags & SSPOT) { |
141 |
> |
if (spotout(sr, srcp->sl.s, 0)) |
142 |
> |
continue; |
143 |
> |
/* adjust solid angle */ |
144 |
> |
si->dom *= d*d; |
145 |
> |
d += srcp->sl.s->flen; |
146 |
> |
si->dom /= d*d; |
147 |
|
} |
148 |
< |
/* compute domega */ |
149 |
< |
return(ddot*source[sn].ss2/(d*d)); |
148 |
> |
return(1); /* sample OK */ |
149 |
> |
} |
150 |
> |
return(0); /* no more samples */ |
151 |
|
} |
152 |
|
|
153 |
|
|
183 |
|
} |
184 |
|
|
185 |
|
|
186 |
+ |
sourcehit(r) /* check to see if ray hit distant source */ |
187 |
+ |
register RAY *r; |
188 |
+ |
{ |
189 |
+ |
int first, last; |
190 |
+ |
register int i; |
191 |
+ |
|
192 |
+ |
if (r->rsrc >= 0) { /* check only one if aimed */ |
193 |
+ |
first = last = r->rsrc; |
194 |
+ |
} else { /* otherwise check all */ |
195 |
+ |
first = 0; last = nsources-1; |
196 |
+ |
} |
197 |
+ |
for (i = first; i <= last; i++) |
198 |
+ |
if ((source[i].sflags & (SDISTANT|SVIRTUAL)) == SDISTANT) |
199 |
+ |
/* |
200 |
+ |
* Check to see if ray is within |
201 |
+ |
* solid angle of source. |
202 |
+ |
*/ |
203 |
+ |
if (2.0*PI * (1.0 - DOT(source[i].sloc,r->rdir)) |
204 |
+ |
<= source[i].ss2) { |
205 |
+ |
r->ro = source[i].so; |
206 |
+ |
if (!(source[i].sflags & SSKIP)) |
207 |
+ |
break; |
208 |
+ |
} |
209 |
+ |
|
210 |
+ |
if (r->ro != NULL) { |
211 |
+ |
for (i = 0; i < 3; i++) |
212 |
+ |
r->ron[i] = -r->rdir[i]; |
213 |
+ |
r->rod = 1.0; |
214 |
+ |
r->rox = NULL; |
215 |
+ |
return(1); |
216 |
+ |
} |
217 |
+ |
return(0); |
218 |
+ |
} |
219 |
+ |
|
220 |
+ |
|
221 |
|
static int |
222 |
|
cntcmp(sc1, sc2) /* contribution compare (descending) */ |
223 |
|
register CNTPTR *sc1, *sc2; |
235 |
|
int (*f)(); /* direct component coefficient function */ |
236 |
|
char *p; /* data for f */ |
237 |
|
{ |
238 |
< |
extern double pow(); |
238 |
> |
extern int (*trace)(); |
239 |
|
register int sn; |
240 |
+ |
SRCINDEX si; |
241 |
|
int nshadcheck, ncnts; |
242 |
|
int nhits; |
243 |
< |
double dom, prob, ourthresh, hwt; |
243 |
> |
double prob, ourthresh, hwt; |
244 |
|
RAY sr; |
245 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
246 |
|
if (nsources <= 0) |
247 |
|
return; /* no sources?! */ |
259 |
– |
/* compute number to check */ |
260 |
– |
nshadcheck = pow((double)nsources, shadcert) + .5; |
261 |
– |
/* modify threshold */ |
262 |
– |
ourthresh = shadthresh / r->rweight; |
248 |
|
/* potential contributions */ |
249 |
< |
for (sn = 0; sn < nsources; sn++) { |
250 |
< |
cntord[sn].sno = sn; |
251 |
< |
cntord[sn].brt = 0.0; |
252 |
< |
/* get source ray */ |
253 |
< |
if ((dom = srcray(&sr, r, sn)) == 0.0) |
254 |
< |
continue; |
255 |
< |
VCOPY(srccnt[sn].dir, sr.rdir); |
249 |
> |
initsrcindex(&si); |
250 |
> |
for (sn = 0; srcray(&sr, r, &si); sn++) { |
251 |
> |
if (sn >= maxcntr) { |
252 |
> |
maxcntr = sn + MAXSPART; |
253 |
> |
srccnt = (CONTRIB *)realloc((char *)srccnt, |
254 |
> |
maxcntr*sizeof(CONTRIB)); |
255 |
> |
cntord = (CNTPTR *)realloc((char *)cntord, |
256 |
> |
maxcntr*sizeof(CNTPTR)); |
257 |
> |
if (srccnt == NULL | cntord == NULL) |
258 |
> |
error(SYSTEM, "out of memory in direct"); |
259 |
> |
} |
260 |
> |
cntord[sn].sndx = sn; |
261 |
> |
srccnt[sn].sno = sr.rsrc; |
262 |
|
/* compute coefficient */ |
263 |
< |
(*f)(srccnt[sn].coef, p, srccnt[sn].dir, dom); |
263 |
> |
(*f)(srccnt[sn].coef, p, sr.rdir, si.dom); |
264 |
|
cntord[sn].brt = bright(srccnt[sn].coef); |
265 |
|
if (cntord[sn].brt <= 0.0) |
266 |
|
continue; |
267 |
+ |
VCOPY(srccnt[sn].dir, sr.rdir); |
268 |
|
/* compute potential */ |
269 |
|
sr.revf = srcvalue; |
270 |
|
rayvalue(&sr); |
273 |
|
cntord[sn].brt = bright(srccnt[sn].val); |
274 |
|
} |
275 |
|
/* sort contributions */ |
276 |
< |
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
276 |
> |
qsort(cntord, sn, sizeof(CNTPTR), cntcmp); |
277 |
|
{ /* find last */ |
278 |
|
register int l, m; |
279 |
|
|
280 |
< |
sn = 0; ncnts = l = nsources; |
280 |
> |
ncnts = l = sn; |
281 |
> |
sn = 0; |
282 |
|
while ((m = (sn + ncnts) >> 1) != l) { |
283 |
|
if (cntord[m].brt > 0.0) |
284 |
|
sn = m; |
287 |
|
l = m; |
288 |
|
} |
289 |
|
} |
290 |
+ |
if (ncnts == 0) |
291 |
+ |
return; /* no contributions! */ |
292 |
|
/* accumulate tail */ |
293 |
|
for (sn = ncnts-1; sn > 0; sn--) |
294 |
|
cntord[sn-1].brt += cntord[sn].brt; |
295 |
+ |
/* compute number to check */ |
296 |
+ |
nshadcheck = pow((double)ncnts, shadcert) + .5; |
297 |
+ |
/* modify threshold */ |
298 |
+ |
ourthresh = shadthresh / r->rweight; |
299 |
|
/* test for shadows */ |
300 |
|
nhits = 0; |
301 |
|
for (sn = 0; sn < ncnts; sn++) { |
304 |
|
cntord[sn].brt-cntord[sn+nshadcheck].brt) |
305 |
|
< ourthresh*bright(r->rcol)) |
306 |
|
break; |
308 |
– |
/* get statistics */ |
309 |
– |
source[cntord[sn].sno].ntests++; |
307 |
|
/* test for hit */ |
308 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
309 |
< |
VCOPY(sr.rdir, srccnt[cntord[sn].sno].dir); |
310 |
< |
sr.rsrc = cntord[sn].sno; |
309 |
> |
VCOPY(sr.rdir, srccnt[cntord[sn].sndx].dir); |
310 |
> |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
311 |
> |
source[sr.rsrc].ntests++; /* keep statistics */ |
312 |
|
if (localhit(&sr, &thescene) && |
313 |
< |
( sr.ro != source[cntord[sn].sno].so || |
314 |
< |
source[cntord[sn].sno].sflags & SFOLLOW )) { |
313 |
> |
( sr.ro != source[sr.rsrc].so || |
314 |
> |
source[sr.rsrc].sflags & SFOLLOW )) { |
315 |
|
/* follow entire path */ |
316 |
|
raycont(&sr); |
317 |
+ |
if (trace != NULL) |
318 |
+ |
(*trace)(&sr); /* trace execution */ |
319 |
|
if (bright(sr.rcol) <= FTINY) |
320 |
|
continue; /* missed! */ |
321 |
< |
copycolor(srccnt[cntord[sn].sno].val, sr.rcol); |
322 |
< |
multcolor(srccnt[cntord[sn].sno].val, |
323 |
< |
srccnt[cntord[sn].sno].coef); |
321 |
> |
copycolor(srccnt[cntord[sn].sndx].val, sr.rcol); |
322 |
> |
multcolor(srccnt[cntord[sn].sndx].val, |
323 |
> |
srccnt[cntord[sn].sndx].coef); |
324 |
|
} |
325 |
|
/* add contribution if hit */ |
326 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
326 |
> |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
327 |
|
nhits++; |
328 |
< |
source[cntord[sn].sno].nhits++; |
328 |
> |
source[sr.rsrc].nhits++; |
329 |
|
} |
330 |
|
/* surface hit rate */ |
331 |
|
if (sn > 0) |
339 |
|
#endif |
340 |
|
/* add in untested sources */ |
341 |
|
for ( ; sn < ncnts; sn++) { |
342 |
< |
prob = hwt * (double)source[cntord[sn].sno].nhits / |
343 |
< |
(double)source[cntord[sn].sno].ntests; |
344 |
< |
scalecolor(srccnt[cntord[sn].sno].val, prob); |
345 |
< |
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
342 |
> |
sr.rsrc = srccnt[cntord[sn].sndx].sno; |
343 |
> |
prob = hwt * (double)source[sr.rsrc].nhits / |
344 |
> |
(double)source[sr.rsrc].ntests; |
345 |
> |
scalecolor(srccnt[cntord[sn].sndx].val, prob); |
346 |
> |
addcolor(r->rcol, srccnt[cntord[sn].sndx].val); |
347 |
|
} |
348 |
+ |
} |
349 |
+ |
|
350 |
+ |
|
351 |
+ |
/**************************************************************** |
352 |
+ |
* The following macros were separated from the m_light() routine |
353 |
+ |
* because they are very nasty and difficult to understand. |
354 |
+ |
*/ |
355 |
+ |
|
356 |
+ |
/* wrongillum * |
357 |
+ |
* |
358 |
+ |
* We cannot allow an illum to pass to another illum, because that |
359 |
+ |
* would almost certainly constitute overcounting. |
360 |
+ |
* However, we do allow an illum to pass to another illum |
361 |
+ |
* that is actually going to relay to a virtual light source. |
362 |
+ |
*/ |
363 |
+ |
|
364 |
+ |
#define wrongillum(m, r) (!(source[r->rsrc].sflags&SVIRTUAL) && \ |
365 |
+ |
objptr(source[r->rsrc].so->omod)->otype==MAT_ILLUM) |
366 |
+ |
|
367 |
+ |
/* wrongsource * |
368 |
+ |
* |
369 |
+ |
* This source is the wrong source (ie. overcounted) if we are |
370 |
+ |
* aimed to a different source than the one we hit and the one |
371 |
+ |
* we hit is not an illum which should be passed. |
372 |
+ |
*/ |
373 |
+ |
|
374 |
+ |
#define wrongsource(m, r) (r->rsrc>=0 && source[r->rsrc].so!=r->ro && \ |
375 |
+ |
(m->otype!=MAT_ILLUM || wrongillum(m,r))) |
376 |
+ |
|
377 |
+ |
/* distglow * |
378 |
+ |
* |
379 |
+ |
* A distant glow is an object that sometimes acts as a light source, |
380 |
+ |
* but is too far away from the test point to be one in this case. |
381 |
+ |
*/ |
382 |
+ |
|
383 |
+ |
#define distglow(m, r) (m->otype==MAT_GLOW && \ |
384 |
+ |
r->rot > m->oargs.farg[3]) |
385 |
+ |
|
386 |
+ |
/* badcomponent * |
387 |
+ |
* |
388 |
+ |
* We must avoid counting light sources in the ambient calculation, |
389 |
+ |
* since the direct component is handled separately. Therefore, any |
390 |
+ |
* ambient ray which hits an active light source must be discarded. |
391 |
+ |
* The same is true for stray specular samples, since the specular |
392 |
+ |
* contribution from light sources is calculated separately. |
393 |
+ |
*/ |
394 |
+ |
|
395 |
+ |
#define badcomponent(m, r) (r->crtype&(AMBIENT|SPECULAR) && \ |
396 |
+ |
!(r->crtype&SHADOW || r->rod < 0.0 || \ |
397 |
+ |
distglow(m, r))) |
398 |
+ |
|
399 |
+ |
/* overcount * |
400 |
+ |
* |
401 |
+ |
* All overcounting possibilities are contained here. |
402 |
+ |
*/ |
403 |
+ |
|
404 |
+ |
#define overcount(m, r) (badcomponent(m,r) || wrongsource(m,r)) |
405 |
+ |
|
406 |
+ |
/* passillum * |
407 |
+ |
* |
408 |
+ |
* An illum passes to another material type when we didn't hit it |
409 |
+ |
* on purpose (as part of a direct calculation), or it is relaying |
410 |
+ |
* a virtual light source. |
411 |
+ |
*/ |
412 |
+ |
|
413 |
+ |
#define passillum(m, r) (m->otype==MAT_ILLUM && \ |
414 |
+ |
(r->rsrc<0 || source[r->rsrc].so!=r->ro || \ |
415 |
+ |
source[r->rsrc].sflags&SVIRTUAL)) |
416 |
+ |
|
417 |
+ |
/* srcignore * |
418 |
+ |
* |
419 |
+ |
* The -di flag renders light sources invisible, and here is the test. |
420 |
+ |
*/ |
421 |
+ |
|
422 |
+ |
#define srcignore(m, r) (directinvis && !(r->crtype&SHADOW) && \ |
423 |
+ |
!distglow(m, r)) |
424 |
+ |
|
425 |
+ |
|
426 |
+ |
m_light(m, r) /* ray hit a light source */ |
427 |
+ |
register OBJREC *m; |
428 |
+ |
register RAY *r; |
429 |
+ |
{ |
430 |
+ |
/* check for over-counting */ |
431 |
+ |
if (overcount(m, r)) |
432 |
+ |
return; |
433 |
+ |
/* check for passed illum */ |
434 |
+ |
if (passillum(m, r)) { |
435 |
+ |
if (m->oargs.nsargs < 1 || !strcmp(m->oargs.sarg[0], VOIDID)) |
436 |
+ |
raytrans(r); |
437 |
+ |
else |
438 |
+ |
rayshade(r, modifier(m->oargs.sarg[0])); |
439 |
+ |
return; |
440 |
+ |
} |
441 |
+ |
/* otherwise treat as source */ |
442 |
+ |
/* check for behind */ |
443 |
+ |
if (r->rod < 0.0) |
444 |
+ |
return; |
445 |
+ |
/* check for invisibility */ |
446 |
+ |
if (srcignore(m, r)) |
447 |
+ |
return; |
448 |
+ |
/* check for outside spot */ |
449 |
+ |
if (m->otype==MAT_SPOT && spotout(r, (SPOT *)m->os, r->rot>=FHUGE)) |
450 |
+ |
return; |
451 |
+ |
/* get distribution pattern */ |
452 |
+ |
raytexture(r, m->omod); |
453 |
+ |
/* get source color */ |
454 |
+ |
setcolor(r->rcol, m->oargs.farg[0], |
455 |
+ |
m->oargs.farg[1], |
456 |
+ |
m->oargs.farg[2]); |
457 |
+ |
/* modify value */ |
458 |
+ |
multcolor(r->rcol, r->pcol); |
459 |
|
} |