10 |
|
#include "mkillum.h" |
11 |
|
#include "face.h" |
12 |
|
#include "cone.h" |
13 |
< |
#include "random.h" |
13 |
> |
#include "source.h" |
14 |
|
|
15 |
|
|
16 |
|
COLORV * distarr = NULL; /* distribution array */ |
17 |
|
int distsiz = 0; |
18 |
+ |
COLORV * direct_discount = NULL; /* amount to take off direct */ |
19 |
|
|
19 |
– |
|
20 |
|
void |
21 |
|
newdist( /* allocate & clear distribution array */ |
22 |
|
int siz |
23 |
|
) |
24 |
|
{ |
25 |
< |
if (siz == 0) { |
25 |
> |
if (siz <= 0) { |
26 |
|
if (distsiz > 0) |
27 |
|
free((void *)distarr); |
28 |
|
distarr = NULL; |
41 |
|
} |
42 |
|
|
43 |
|
|
44 |
+ |
static void |
45 |
+ |
new_discount() /* allocate space for direct contrib. record */ |
46 |
+ |
{ |
47 |
+ |
if (distsiz <= 0) |
48 |
+ |
return; |
49 |
+ |
direct_discount = (COLORV *)calloc(distsiz, sizeof(COLOR)); |
50 |
+ |
if (direct_discount == NULL) |
51 |
+ |
error(SYSTEM, "out of memory in new_discount"); |
52 |
+ |
} |
53 |
+ |
|
54 |
+ |
|
55 |
+ |
static void |
56 |
+ |
done_discount() /* clear off direct contrib. record */ |
57 |
+ |
{ |
58 |
+ |
if (direct_discount == NULL) |
59 |
+ |
return; |
60 |
+ |
free((void *)direct_discount); |
61 |
+ |
direct_discount = NULL; |
62 |
+ |
} |
63 |
+ |
|
64 |
+ |
|
65 |
|
int |
66 |
< |
process_ray(RAY *r, int rv) |
66 |
> |
process_ray( /* process a ray result or report error */ |
67 |
> |
RAY *r, |
68 |
> |
int rv |
69 |
> |
) |
70 |
|
{ |
71 |
|
COLORV *colp; |
72 |
|
|
73 |
< |
if (rv == 0) |
73 |
> |
if (rv == 0) /* no result ready */ |
74 |
|
return(0); |
75 |
|
if (rv < 0) |
76 |
|
error(USER, "ray tracing process died"); |
77 |
|
if (r->rno >= distsiz) |
78 |
|
error(INTERNAL, "bad returned index in process_ray"); |
79 |
+ |
multcolor(r->rcol, r->rcoef); /* in case it's a source ray */ |
80 |
|
colp = &distarr[r->rno * 3]; |
81 |
|
addcolor(colp, r->rcol); |
82 |
+ |
if (r->rsrc >= 0 && /* remember source contrib. */ |
83 |
+ |
direct_discount != NULL) { |
84 |
+ |
colp = &direct_discount[r->rno * 3]; |
85 |
+ |
addcolor(colp, r->rcol); |
86 |
+ |
} |
87 |
|
return(1); |
88 |
|
} |
89 |
|
|
90 |
|
|
91 |
|
void |
92 |
< |
raysamp( /* queue a ray sample */ |
92 |
> |
raysamp( /* queue a ray sample */ |
93 |
|
int ndx, |
94 |
|
FVECT org, |
95 |
|
FVECT dir |
111 |
|
|
112 |
|
|
113 |
|
void |
114 |
+ |
srcsamps( /* sample sources from this surface position */ |
115 |
+ |
struct illum_args *il, |
116 |
+ |
FVECT org, |
117 |
+ |
FVECT nrm, |
118 |
+ |
MAT4 ixfm |
119 |
+ |
) |
120 |
+ |
{ |
121 |
+ |
int nalt, nazi; |
122 |
+ |
SRCINDEX si; |
123 |
+ |
RAY sr; |
124 |
+ |
FVECT v; |
125 |
+ |
double d; |
126 |
+ |
int i, j; |
127 |
+ |
/* get sampling density */ |
128 |
+ |
if (il->sampdens <= 0) { |
129 |
+ |
nalt = nazi = 1; |
130 |
+ |
} else { |
131 |
+ |
i = PI * il->sampdens; |
132 |
+ |
nalt = sqrt(i/PI) + .5; |
133 |
+ |
nazi = PI*nalt + .5; |
134 |
+ |
} |
135 |
+ |
initsrcindex(&si); /* loop over (sub)sources */ |
136 |
+ |
for ( ; ; ) { |
137 |
+ |
VCOPY(sr.rorg, org); /* pick side to shoot from */ |
138 |
+ |
if (il->sd != NULL) { |
139 |
+ |
int sn = si.sn; |
140 |
+ |
if (si.sp+1 >= si.np) ++sn; |
141 |
+ |
if (sn >= nsources) break; |
142 |
+ |
if (source[sn].sflags & SDISTANT) |
143 |
+ |
d = DOT(source[sn].sloc, nrm); |
144 |
+ |
else { |
145 |
+ |
VSUB(v, source[sn].sloc, org); |
146 |
+ |
d = DOT(v, nrm); |
147 |
+ |
} |
148 |
+ |
} else |
149 |
+ |
d = 1.0; /* only transmission */ |
150 |
+ |
if (d < 0.0) |
151 |
+ |
d = -1.0001*il->thick - 5.*FTINY; |
152 |
+ |
else |
153 |
+ |
d = 5.*FTINY; |
154 |
+ |
for (i = 3; i--; ) |
155 |
+ |
sr.rorg[i] += d*nrm[i]; |
156 |
+ |
samplendx++; /* increment sample counter */ |
157 |
+ |
if (!srcray(&sr, NULL, &si)) |
158 |
+ |
break; /* end of sources */ |
159 |
+ |
/* index direction */ |
160 |
+ |
if (ixfm != NULL) |
161 |
+ |
multv3(v, sr.rdir, ixfm); |
162 |
+ |
else |
163 |
+ |
VCOPY(v, sr.rdir); |
164 |
+ |
if (il->sd != NULL) { |
165 |
+ |
i = getBSDF_incndx(il->sd, v); |
166 |
+ |
if (i < 0) |
167 |
+ |
continue; /* must not be important */ |
168 |
+ |
sr.rno = i; |
169 |
+ |
d = 1.0/getBSDF_incohm(il->sd, i); |
170 |
+ |
} else { |
171 |
+ |
if (v[2] >= -FTINY) |
172 |
+ |
continue; /* only sample transmission */ |
173 |
+ |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
174 |
+ |
sr.rno = flatindex(v, nalt, nazi); |
175 |
+ |
d = nalt*nazi*(1./PI) * v[2]; |
176 |
+ |
} |
177 |
+ |
d *= si.dom; /* solid angle correction */ |
178 |
+ |
scalecolor(sr.rcoef, d); |
179 |
+ |
process_ray(&sr, ray_pqueue(&sr)); |
180 |
+ |
} |
181 |
+ |
} |
182 |
+ |
|
183 |
+ |
|
184 |
+ |
void |
185 |
|
rayclean() /* finish all pending rays */ |
186 |
|
{ |
187 |
|
RAY myRay; |
228 |
|
} |
229 |
|
|
230 |
|
|
231 |
< |
static void |
231 |
> |
void |
232 |
|
flatdir( /* compute uniform hemispherical direction */ |
233 |
< |
register FVECT dv, |
233 |
> |
FVECT dv, |
234 |
|
double alt, |
235 |
|
double azi |
236 |
|
) |
244 |
|
dv[2] = sqrt(1. - alt); |
245 |
|
} |
246 |
|
|
247 |
+ |
int |
248 |
+ |
flatindex( /* compute index for hemispherical direction */ |
249 |
+ |
FVECT dv, |
250 |
+ |
int nalt, |
251 |
+ |
int nazi |
252 |
+ |
) |
253 |
+ |
{ |
254 |
+ |
double d; |
255 |
+ |
int i, j; |
256 |
+ |
|
257 |
+ |
d = 1.0 - dv[2]*dv[2]; |
258 |
+ |
i = d*nalt; |
259 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
260 |
+ |
if (d < 0.0) d += 1.0; |
261 |
+ |
j = d*nazi + 0.5; |
262 |
+ |
if (j >= nazi) j = 0; |
263 |
+ |
return(i*nazi + j); |
264 |
+ |
} |
265 |
|
|
266 |
+ |
|
267 |
|
int |
268 |
|
my_default( /* default illum action */ |
269 |
|
OBJREC *ob, |
286 |
|
char *nm |
287 |
|
) |
288 |
|
{ |
169 |
– |
#define MAXMISS (5*n*il->nsamps) |
289 |
|
int dim[2]; |
290 |
< |
int n, nalt, nazi, h, alti; |
290 |
> |
int n, nalt, nazi, alti; |
291 |
|
double sp[2], r1, r2; |
292 |
+ |
int h; |
293 |
|
FVECT dn, org, dir; |
294 |
|
FVECT u, v; |
295 |
|
double ur[2], vr[2]; |
296 |
|
MAT4 xfm; |
297 |
< |
int nmisses; |
297 |
> |
int nallow; |
298 |
|
FACE *fa; |
299 |
< |
register int i, j; |
299 |
> |
int i, j; |
300 |
|
/* get/check arguments */ |
301 |
|
fa = getface(ob); |
302 |
|
if (fa->area == 0.0) { |
304 |
|
return(my_default(ob, il, nm)); |
305 |
|
} |
306 |
|
/* set up sampling */ |
187 |
– |
if (il->sampdens <= 0) { |
188 |
– |
nalt = nazi = 1; /* diffuse assumption */ |
189 |
– |
} else { |
190 |
– |
n = PI * il->sampdens; |
191 |
– |
nalt = sqrt(n/PI) + .5; |
192 |
– |
nazi = PI*nalt + .5; |
193 |
– |
} |
307 |
|
if (il->sd != NULL) { |
308 |
|
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
309 |
|
objerror(ob, WARNING, "illegal up direction"); |
311 |
|
return(my_default(ob, il, nm)); |
312 |
|
} |
313 |
|
n = il->sd->ninc; |
314 |
< |
} else |
314 |
> |
} else { |
315 |
> |
if (il->sampdens <= 0) { |
316 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
317 |
> |
} else { |
318 |
> |
n = PI * il->sampdens; |
319 |
> |
nalt = sqrt(n/PI) + .5; |
320 |
> |
nazi = PI*nalt + .5; |
321 |
> |
} |
322 |
|
n = nazi*nalt; |
323 |
+ |
} |
324 |
|
newdist(n); |
325 |
|
/* take first edge >= sqrt(area) */ |
326 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
349 |
|
} |
350 |
|
dim[0] = random(); |
351 |
|
/* sample polygon */ |
352 |
< |
nmisses = 0; |
352 |
> |
nallow = 5*n*il->nsamps; |
353 |
|
for (dim[1] = 0; dim[1] < n; dim[1]++) |
354 |
|
for (i = 0; i < il->nsamps; i++) { |
355 |
< |
/* random direction */ |
355 |
> |
/* randomize direction */ |
356 |
|
h = ilhash(dim, 2) + i; |
357 |
|
if (il->sd != NULL) { |
358 |
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
366 |
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
367 |
|
dn[2]*fa->norm[j]; |
368 |
|
} |
369 |
< |
/* random location */ |
369 |
> |
/* randomize location */ |
370 |
|
do { |
371 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
371 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
372 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
373 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
374 |
|
for (j = 0; j < 3; j++) |
375 |
|
org[j] = r1*u[j] + r2*v[j] |
376 |
|
+ fa->offset*fa->norm[j]; |
377 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
378 |
< |
if (nmisses > MAXMISS) { |
377 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
378 |
> |
if (nallow < 0) { |
379 |
|
objerror(ob, WARNING, "bad aspect"); |
380 |
|
rayclean(); |
381 |
|
freeface(ob); |
382 |
|
return(my_default(ob, il, nm)); |
383 |
|
} |
384 |
|
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
385 |
< |
r1 = -1.0001*il->thick - .0001; |
385 |
> |
r1 = -1.0001*il->thick - 5.*FTINY; |
386 |
|
else |
387 |
< |
r1 = .0001; |
387 |
> |
r1 = 5.*FTINY; |
388 |
|
for (j = 0; j < 3; j++) |
389 |
|
org[j] += r1*fa->norm[j]; |
390 |
|
/* send sample */ |
391 |
|
raysamp(dim[1], org, dir); |
392 |
|
} |
393 |
+ |
/* add in direct component? */ |
394 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
395 |
+ |
MAT4 ixfm; |
396 |
+ |
if (il->sd == NULL) { |
397 |
+ |
for (i = 3; i--; ) { |
398 |
+ |
ixfm[i][0] = u[i]; |
399 |
+ |
ixfm[i][1] = v[i]; |
400 |
+ |
ixfm[i][2] = fa->norm[i]; |
401 |
+ |
ixfm[i][3] = 0.; |
402 |
+ |
} |
403 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
404 |
+ |
ixfm[3][3] = 1.; |
405 |
+ |
} else { |
406 |
+ |
if (!invmat4(ixfm, xfm)) |
407 |
+ |
objerror(ob, INTERNAL, |
408 |
+ |
"cannot invert BSDF transform"); |
409 |
+ |
if (!(il->flags & IL_LIGHT)) |
410 |
+ |
new_discount(); |
411 |
+ |
} |
412 |
+ |
dim[0] = random(); |
413 |
+ |
nallow = 10*il->nsamps; |
414 |
+ |
for (i = 0; i < il->nsamps; i++) { |
415 |
+ |
/* randomize location */ |
416 |
+ |
h = dim[0] + samplendx++; |
417 |
+ |
do { |
418 |
+ |
multisamp(sp, 2, urand(h+nallow)); |
419 |
+ |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
420 |
+ |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
421 |
+ |
for (j = 0; j < 3; j++) |
422 |
+ |
org[j] = r1*u[j] + r2*v[j] |
423 |
+ |
+ fa->offset*fa->norm[j]; |
424 |
+ |
} while (!inface(org, fa) && nallow-- > 0); |
425 |
+ |
if (nallow < 0) { |
426 |
+ |
objerror(ob, WARNING, "bad aspect"); |
427 |
+ |
rayclean(); |
428 |
+ |
freeface(ob); |
429 |
+ |
return(my_default(ob, il, nm)); |
430 |
+ |
} |
431 |
+ |
/* sample source rays */ |
432 |
+ |
srcsamps(il, org, fa->norm, ixfm); |
433 |
+ |
} |
434 |
+ |
} |
435 |
+ |
/* wait for all rays to finish */ |
436 |
|
rayclean(); |
437 |
< |
if (il->sd != NULL) /* run distribution through BSDF */ |
437 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
438 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
439 |
> |
nazi = PI*nalt + .5; |
440 |
|
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
441 |
+ |
done_discount(); |
442 |
+ |
if (!il->sampdens) |
443 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
444 |
+ |
} |
445 |
|
/* write out the face and its distribution */ |
446 |
|
if (average(il, distarr, n)) { |
447 |
|
if (il->sampdens > 0) |
452 |
|
/* clean up */ |
453 |
|
freeface(ob); |
454 |
|
return(0); |
285 |
– |
#undef MAXMISS |
455 |
|
} |
456 |
|
|
457 |
|
|
509 |
|
/* send sample */ |
510 |
|
raysamp(dim[1]*nazi+dim[2], org, dir); |
511 |
|
} |
512 |
+ |
/* wait for all rays to finish */ |
513 |
|
rayclean(); |
514 |
|
/* write out the sphere and its distribution */ |
515 |
|
if (average(il, distarr, n)) { |
540 |
|
FVECT u, v; |
541 |
|
MAT4 xfm; |
542 |
|
CONE *co; |
543 |
< |
register int i, j; |
543 |
> |
int i, j; |
544 |
|
/* get/check arguments */ |
545 |
|
co = getcone(ob, 0); |
546 |
|
/* set up sampling */ |
377 |
– |
if (il->sampdens <= 0) |
378 |
– |
nalt = nazi = 1; |
379 |
– |
else { |
380 |
– |
n = PI * il->sampdens; |
381 |
– |
nalt = sqrt(n/PI) + .5; |
382 |
– |
nazi = PI*nalt + .5; |
383 |
– |
} |
547 |
|
if (il->sd != NULL) { |
548 |
|
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
549 |
|
objerror(ob, WARNING, "illegal up direction"); |
551 |
|
return(my_default(ob, il, nm)); |
552 |
|
} |
553 |
|
n = il->sd->ninc; |
554 |
< |
} else |
554 |
> |
} else { |
555 |
> |
if (il->sampdens <= 0) { |
556 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
557 |
> |
} else { |
558 |
> |
n = PI * il->sampdens; |
559 |
> |
nalt = sqrt(n/PI) + .5; |
560 |
> |
nazi = PI*nalt + .5; |
561 |
> |
} |
562 |
|
n = nazi*nalt; |
563 |
+ |
} |
564 |
|
newdist(n); |
565 |
|
mkaxes(u, v, co->ad); |
566 |
|
dim[0] = random(); |
569 |
|
for (i = 0; i < il->nsamps; i++) { |
570 |
|
/* next sample point */ |
571 |
|
h = ilhash(dim,2) + i; |
572 |
< |
/* random direction */ |
572 |
> |
/* randomize direction */ |
573 |
|
if (il->sd != NULL) { |
574 |
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
575 |
|
} else { |
579 |
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
580 |
|
flatdir(dn, r1, r2); |
581 |
|
for (j = 0; j < 3; j++) |
582 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
582 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
583 |
|
} |
584 |
< |
/* random location */ |
584 |
> |
/* randomize location */ |
585 |
|
multisamp(sp, 2, urand(h+8371)); |
586 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
587 |
|
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
589 |
|
r1 = r3*cos(r2); |
590 |
|
r2 = r3*sin(r2); |
591 |
|
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
592 |
< |
r3 = -1.0001*il->thick - .0001; |
592 |
> |
r3 = -1.0001*il->thick - 5.*FTINY; |
593 |
|
else |
594 |
< |
r3 = .0001; |
594 |
> |
r3 = 5.*FTINY; |
595 |
|
for (j = 0; j < 3; j++) |
596 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
597 |
|
r3*co->ad[j]; |
598 |
|
/* send sample */ |
599 |
|
raysamp(dim[1], org, dir); |
600 |
|
} |
601 |
+ |
/* add in direct component? */ |
602 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
603 |
+ |
MAT4 ixfm; |
604 |
+ |
if (il->sd == NULL) { |
605 |
+ |
for (i = 3; i--; ) { |
606 |
+ |
ixfm[i][0] = u[i]; |
607 |
+ |
ixfm[i][1] = v[i]; |
608 |
+ |
ixfm[i][2] = co->ad[i]; |
609 |
+ |
ixfm[i][3] = 0.; |
610 |
+ |
} |
611 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
612 |
+ |
ixfm[3][3] = 1.; |
613 |
+ |
} else { |
614 |
+ |
if (!invmat4(ixfm, xfm)) |
615 |
+ |
objerror(ob, INTERNAL, |
616 |
+ |
"cannot invert BSDF transform"); |
617 |
+ |
if (!(il->flags & IL_LIGHT)) |
618 |
+ |
new_discount(); |
619 |
+ |
} |
620 |
+ |
dim[0] = random(); |
621 |
+ |
for (i = 0; i < il->nsamps; i++) { |
622 |
+ |
/* randomize location */ |
623 |
+ |
h = dim[0] + samplendx++; |
624 |
+ |
multisamp(sp, 2, urand(h)); |
625 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
626 |
+ |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
627 |
+ |
r2 = 2.*PI*sp[1]; |
628 |
+ |
r1 = r3*cos(r2); |
629 |
+ |
r2 = r3*sin(r2); |
630 |
+ |
for (j = 0; j < 3; j++) |
631 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
632 |
+ |
/* sample source rays */ |
633 |
+ |
srcsamps(il, org, co->ad, ixfm); |
634 |
+ |
} |
635 |
+ |
} |
636 |
+ |
/* wait for all rays to finish */ |
637 |
|
rayclean(); |
638 |
< |
if (il->sd != NULL) /* run distribution through BSDF */ |
638 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
639 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
640 |
> |
nazi = PI*nalt + .5; |
641 |
|
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
642 |
+ |
done_discount(); |
643 |
+ |
if (!il->sampdens) |
644 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
645 |
+ |
} |
646 |
|
/* write out the ring and its distribution */ |
647 |
|
if (average(il, distarr, n)) { |
648 |
|
if (il->sampdens > 0) |