| 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 |
+ |
if (!srcray(&sr, NULL, &si)) |
| 157 |
+ |
break; /* end of sources */ |
| 158 |
+ |
/* index direction */ |
| 159 |
+ |
if (ixfm != NULL) |
| 160 |
+ |
multv3(v, sr.rdir, ixfm); |
| 161 |
+ |
else |
| 162 |
+ |
VCOPY(v, sr.rdir); |
| 163 |
+ |
if (il->sd != NULL) { |
| 164 |
+ |
i = getBSDF_incndx(il->sd, v); |
| 165 |
+ |
if (i < 0) |
| 166 |
+ |
continue; /* must not be important */ |
| 167 |
+ |
sr.rno = i; |
| 168 |
+ |
d = 1.0/getBSDF_incohm(il->sd, i); |
| 169 |
+ |
} else { |
| 170 |
+ |
if (v[2] >= -FTINY) |
| 171 |
+ |
continue; /* only sample transmission */ |
| 172 |
+ |
v[0] = -v[0]; v[1] = -v[1]; v[2] = -v[2]; |
| 173 |
+ |
sr.rno = flatindex(v, nalt, nazi); |
| 174 |
+ |
d = nalt*nazi*(1./PI) * v[2]; |
| 175 |
+ |
} |
| 176 |
+ |
d *= si.dom; /* solid angle correction */ |
| 177 |
+ |
scalecolor(sr.rcoef, d); |
| 178 |
+ |
process_ray(&sr, ray_pqueue(&sr)); |
| 179 |
+ |
} |
| 180 |
+ |
} |
| 181 |
+ |
|
| 182 |
+ |
|
| 183 |
+ |
void |
| 184 |
|
rayclean() /* finish all pending rays */ |
| 185 |
|
{ |
| 186 |
|
RAY myRay; |
| 227 |
|
} |
| 228 |
|
|
| 229 |
|
|
| 230 |
< |
static void |
| 230 |
> |
void |
| 231 |
|
flatdir( /* compute uniform hemispherical direction */ |
| 232 |
< |
register FVECT dv, |
| 232 |
> |
FVECT dv, |
| 233 |
|
double alt, |
| 234 |
|
double azi |
| 235 |
|
) |
| 243 |
|
dv[2] = sqrt(1. - alt); |
| 244 |
|
} |
| 245 |
|
|
| 246 |
+ |
int |
| 247 |
+ |
flatindex( /* compute index for hemispherical direction */ |
| 248 |
+ |
FVECT dv, |
| 249 |
+ |
int nalt, |
| 250 |
+ |
int nazi |
| 251 |
+ |
) |
| 252 |
+ |
{ |
| 253 |
+ |
double d; |
| 254 |
+ |
int i, j; |
| 255 |
+ |
|
| 256 |
+ |
d = 1.0 - dv[2]*dv[2]; |
| 257 |
+ |
i = d*nalt; |
| 258 |
+ |
d = atan2(dv[1], dv[0]) * (0.5/PI); |
| 259 |
+ |
if (d < 0.0) d += 1.0; |
| 260 |
+ |
j = d*nazi + 0.5; |
| 261 |
+ |
if (j >= nazi) j = 0; |
| 262 |
+ |
return(i*nazi + j); |
| 263 |
+ |
} |
| 264 |
|
|
| 265 |
+ |
|
| 266 |
|
int |
| 267 |
|
my_default( /* default illum action */ |
| 268 |
|
OBJREC *ob, |
| 285 |
|
char *nm |
| 286 |
|
) |
| 287 |
|
{ |
| 169 |
– |
#define MAXMISS (5*n*il->nsamps) |
| 288 |
|
int dim[2]; |
| 289 |
< |
int n, nalt, nazi, h, alti; |
| 289 |
> |
int n, nalt, nazi, alti; |
| 290 |
|
double sp[2], r1, r2; |
| 291 |
+ |
int h; |
| 292 |
|
FVECT dn, org, dir; |
| 293 |
|
FVECT u, v; |
| 294 |
|
double ur[2], vr[2]; |
| 295 |
|
MAT4 xfm; |
| 296 |
< |
int nmisses; |
| 296 |
> |
int nallow; |
| 297 |
|
FACE *fa; |
| 298 |
< |
register int i, j; |
| 298 |
> |
int i, j; |
| 299 |
|
/* get/check arguments */ |
| 300 |
|
fa = getface(ob); |
| 301 |
|
if (fa->area == 0.0) { |
| 303 |
|
return(my_default(ob, il, nm)); |
| 304 |
|
} |
| 305 |
|
/* 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 |
– |
} |
| 306 |
|
if (il->sd != NULL) { |
| 307 |
|
if (!getBSDF_xfm(xfm, fa->norm, il->udir)) { |
| 308 |
|
objerror(ob, WARNING, "illegal up direction"); |
| 310 |
|
return(my_default(ob, il, nm)); |
| 311 |
|
} |
| 312 |
|
n = il->sd->ninc; |
| 313 |
< |
} else |
| 313 |
> |
} else { |
| 314 |
> |
if (il->sampdens <= 0) { |
| 315 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 316 |
> |
} else { |
| 317 |
> |
n = PI * il->sampdens; |
| 318 |
> |
nalt = sqrt(n/PI) + .5; |
| 319 |
> |
nazi = PI*nalt + .5; |
| 320 |
> |
} |
| 321 |
|
n = nazi*nalt; |
| 322 |
+ |
} |
| 323 |
|
newdist(n); |
| 324 |
|
/* take first edge >= sqrt(area) */ |
| 325 |
|
for (j = fa->nv-1, i = 0; i < fa->nv; j = i++) { |
| 348 |
|
} |
| 349 |
|
dim[0] = random(); |
| 350 |
|
/* sample polygon */ |
| 351 |
< |
nmisses = 0; |
| 351 |
> |
nallow = 5*n*il->nsamps; |
| 352 |
|
for (dim[1] = 0; dim[1] < n; dim[1]++) |
| 353 |
|
for (i = 0; i < il->nsamps; i++) { |
| 354 |
< |
/* random direction */ |
| 354 |
> |
/* randomize direction */ |
| 355 |
|
h = ilhash(dim, 2) + i; |
| 356 |
|
if (il->sd != NULL) { |
| 357 |
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 365 |
|
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - |
| 366 |
|
dn[2]*fa->norm[j]; |
| 367 |
|
} |
| 368 |
< |
/* random location */ |
| 368 |
> |
/* randomize location */ |
| 369 |
|
do { |
| 370 |
< |
multisamp(sp, 2, urand(h+4862+nmisses)); |
| 370 |
> |
multisamp(sp, 2, urand(h+4862+nallow)); |
| 371 |
|
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 372 |
|
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 373 |
|
for (j = 0; j < 3; j++) |
| 374 |
|
org[j] = r1*u[j] + r2*v[j] |
| 375 |
|
+ fa->offset*fa->norm[j]; |
| 376 |
< |
} while (!inface(org, fa) && nmisses++ < MAXMISS); |
| 377 |
< |
if (nmisses > MAXMISS) { |
| 376 |
> |
} while (!inface(org, fa) && nallow-- > 0); |
| 377 |
> |
if (nallow < 0) { |
| 378 |
|
objerror(ob, WARNING, "bad aspect"); |
| 379 |
|
rayclean(); |
| 380 |
|
freeface(ob); |
| 381 |
|
return(my_default(ob, il, nm)); |
| 382 |
|
} |
| 383 |
|
if (il->sd != NULL && DOT(dir, fa->norm) < -FTINY) |
| 384 |
< |
r1 = -1.0001*il->thick - .0001; |
| 384 |
> |
r1 = -1.0001*il->thick - 5.*FTINY; |
| 385 |
|
else |
| 386 |
< |
r1 = .0001; |
| 386 |
> |
r1 = 5.*FTINY; |
| 387 |
|
for (j = 0; j < 3; j++) |
| 388 |
|
org[j] += r1*fa->norm[j]; |
| 389 |
|
/* send sample */ |
| 390 |
|
raysamp(dim[1], org, dir); |
| 391 |
|
} |
| 392 |
+ |
/* add in direct component? */ |
| 393 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
| 394 |
+ |
MAT4 ixfm; |
| 395 |
+ |
if (il->sd == NULL) { |
| 396 |
+ |
for (i = 3; i--; ) { |
| 397 |
+ |
ixfm[i][0] = u[i]; |
| 398 |
+ |
ixfm[i][1] = v[i]; |
| 399 |
+ |
ixfm[i][2] = fa->norm[i]; |
| 400 |
+ |
ixfm[i][3] = 0.; |
| 401 |
+ |
} |
| 402 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 403 |
+ |
ixfm[3][3] = 1.; |
| 404 |
+ |
} else { |
| 405 |
+ |
if (!invmat4(ixfm, xfm)) |
| 406 |
+ |
objerror(ob, INTERNAL, |
| 407 |
+ |
"cannot invert BSDF transform"); |
| 408 |
+ |
if (!(il->flags & IL_LIGHT)) |
| 409 |
+ |
new_discount(); |
| 410 |
+ |
} |
| 411 |
+ |
dim[0] = random(); |
| 412 |
+ |
nallow = 10*il->nsamps; |
| 413 |
+ |
for (i = 0; i < il->nsamps; i++) { |
| 414 |
+ |
/* randomize location */ |
| 415 |
+ |
h = dim[0] + samplendx++; |
| 416 |
+ |
do { |
| 417 |
+ |
multisamp(sp, 2, urand(h+nallow)); |
| 418 |
+ |
r1 = ur[0] + (ur[1]-ur[0]) * sp[0]; |
| 419 |
+ |
r2 = vr[0] + (vr[1]-vr[0]) * sp[1]; |
| 420 |
+ |
for (j = 0; j < 3; j++) |
| 421 |
+ |
org[j] = r1*u[j] + r2*v[j] |
| 422 |
+ |
+ fa->offset*fa->norm[j]; |
| 423 |
+ |
} while (!inface(org, fa) && nallow-- > 0); |
| 424 |
+ |
if (nallow < 0) { |
| 425 |
+ |
objerror(ob, WARNING, "bad aspect"); |
| 426 |
+ |
rayclean(); |
| 427 |
+ |
freeface(ob); |
| 428 |
+ |
return(my_default(ob, il, nm)); |
| 429 |
+ |
} |
| 430 |
+ |
/* sample source rays */ |
| 431 |
+ |
srcsamps(il, org, fa->norm, ixfm); |
| 432 |
+ |
} |
| 433 |
+ |
} |
| 434 |
+ |
/* wait for all rays to finish */ |
| 435 |
|
rayclean(); |
| 436 |
< |
if (il->sd != NULL) /* run distribution through BSDF */ |
| 436 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
| 437 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
| 438 |
> |
nazi = PI*nalt + .5; |
| 439 |
|
redistribute(il->sd, nalt, nazi, u, v, fa->norm, xfm); |
| 440 |
+ |
done_discount(); |
| 441 |
+ |
if (!il->sampdens) |
| 442 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
| 443 |
+ |
} |
| 444 |
|
/* write out the face and its distribution */ |
| 445 |
|
if (average(il, distarr, n)) { |
| 446 |
|
if (il->sampdens > 0) |
| 451 |
|
/* clean up */ |
| 452 |
|
freeface(ob); |
| 453 |
|
return(0); |
| 285 |
– |
#undef MAXMISS |
| 454 |
|
} |
| 455 |
|
|
| 456 |
|
|
| 508 |
|
/* send sample */ |
| 509 |
|
raysamp(dim[1]*nazi+dim[2], org, dir); |
| 510 |
|
} |
| 511 |
+ |
/* wait for all rays to finish */ |
| 512 |
|
rayclean(); |
| 513 |
|
/* write out the sphere and its distribution */ |
| 514 |
|
if (average(il, distarr, n)) { |
| 539 |
|
FVECT u, v; |
| 540 |
|
MAT4 xfm; |
| 541 |
|
CONE *co; |
| 542 |
< |
register int i, j; |
| 542 |
> |
int i, j; |
| 543 |
|
/* get/check arguments */ |
| 544 |
|
co = getcone(ob, 0); |
| 545 |
|
/* 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 |
– |
} |
| 546 |
|
if (il->sd != NULL) { |
| 547 |
|
if (!getBSDF_xfm(xfm, co->ad, il->udir)) { |
| 548 |
|
objerror(ob, WARNING, "illegal up direction"); |
| 550 |
|
return(my_default(ob, il, nm)); |
| 551 |
|
} |
| 552 |
|
n = il->sd->ninc; |
| 553 |
< |
} else |
| 553 |
> |
} else { |
| 554 |
> |
if (il->sampdens <= 0) { |
| 555 |
> |
nalt = nazi = 1; /* diffuse assumption */ |
| 556 |
> |
} else { |
| 557 |
> |
n = PI * il->sampdens; |
| 558 |
> |
nalt = sqrt(n/PI) + .5; |
| 559 |
> |
nazi = PI*nalt + .5; |
| 560 |
> |
} |
| 561 |
|
n = nazi*nalt; |
| 562 |
+ |
} |
| 563 |
|
newdist(n); |
| 564 |
|
mkaxes(u, v, co->ad); |
| 565 |
|
dim[0] = random(); |
| 568 |
|
for (i = 0; i < il->nsamps; i++) { |
| 569 |
|
/* next sample point */ |
| 570 |
|
h = ilhash(dim,2) + i; |
| 571 |
< |
/* random direction */ |
| 571 |
> |
/* randomize direction */ |
| 572 |
|
if (il->sd != NULL) { |
| 573 |
|
r_BSDF_incvec(dir, il->sd, dim[1], urand(h), xfm); |
| 574 |
|
} else { |
| 578 |
|
r2 = (dim[1] - alti*nazi + sp[1] - .5)/nazi; |
| 579 |
|
flatdir(dn, r1, r2); |
| 580 |
|
for (j = 0; j < 3; j++) |
| 581 |
< |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 581 |
> |
dir[j] = -dn[0]*u[j] - dn[1]*v[j] - dn[2]*co->ad[j]; |
| 582 |
|
} |
| 583 |
< |
/* random location */ |
| 583 |
> |
/* randomize location */ |
| 584 |
|
multisamp(sp, 2, urand(h+8371)); |
| 585 |
|
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 586 |
|
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 588 |
|
r1 = r3*cos(r2); |
| 589 |
|
r2 = r3*sin(r2); |
| 590 |
|
if (il->sd != NULL && DOT(dir, co->ad) < -FTINY) |
| 591 |
< |
r3 = -1.0001*il->thick - .0001; |
| 591 |
> |
r3 = -1.0001*il->thick - 5.*FTINY; |
| 592 |
|
else |
| 593 |
< |
r3 = .0001; |
| 593 |
> |
r3 = 5.*FTINY; |
| 594 |
|
for (j = 0; j < 3; j++) |
| 595 |
|
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j] + |
| 596 |
|
r3*co->ad[j]; |
| 597 |
|
/* send sample */ |
| 598 |
|
raysamp(dim[1], org, dir); |
| 599 |
|
} |
| 600 |
+ |
/* add in direct component? */ |
| 601 |
+ |
if (!directvis && (il->flags & IL_LIGHT || il->sd != NULL)) { |
| 602 |
+ |
MAT4 ixfm; |
| 603 |
+ |
if (il->sd == NULL) { |
| 604 |
+ |
for (i = 3; i--; ) { |
| 605 |
+ |
ixfm[i][0] = u[i]; |
| 606 |
+ |
ixfm[i][1] = v[i]; |
| 607 |
+ |
ixfm[i][2] = co->ad[i]; |
| 608 |
+ |
ixfm[i][3] = 0.; |
| 609 |
+ |
} |
| 610 |
+ |
ixfm[3][0] = ixfm[3][1] = ixfm[3][2] = 0.; |
| 611 |
+ |
ixfm[3][3] = 1.; |
| 612 |
+ |
} else { |
| 613 |
+ |
if (!invmat4(ixfm, xfm)) |
| 614 |
+ |
objerror(ob, INTERNAL, |
| 615 |
+ |
"cannot invert BSDF transform"); |
| 616 |
+ |
if (!(il->flags & IL_LIGHT)) |
| 617 |
+ |
new_discount(); |
| 618 |
+ |
} |
| 619 |
+ |
dim[0] = random(); |
| 620 |
+ |
for (i = 0; i < il->nsamps; i++) { |
| 621 |
+ |
/* randomize location */ |
| 622 |
+ |
h = dim[0] + samplendx++; |
| 623 |
+ |
multisamp(sp, 2, urand(h)); |
| 624 |
+ |
r3 = sqrt(CO_R0(co)*CO_R0(co) + |
| 625 |
+ |
sp[0]*(CO_R1(co)*CO_R1(co) - CO_R0(co)*CO_R0(co))); |
| 626 |
+ |
r2 = 2.*PI*sp[1]; |
| 627 |
+ |
r1 = r3*cos(r2); |
| 628 |
+ |
r2 = r3*sin(r2); |
| 629 |
+ |
for (j = 0; j < 3; j++) |
| 630 |
+ |
org[j] = CO_P0(co)[j] + r1*u[j] + r2*v[j]; |
| 631 |
+ |
/* sample source rays */ |
| 632 |
+ |
srcsamps(il, org, co->ad, ixfm); |
| 633 |
+ |
} |
| 634 |
+ |
} |
| 635 |
+ |
/* wait for all rays to finish */ |
| 636 |
|
rayclean(); |
| 637 |
< |
if (il->sd != NULL) /* run distribution through BSDF */ |
| 637 |
> |
if (il->sd != NULL) { /* run distribution through BSDF */ |
| 638 |
> |
nalt = sqrt(il->sd->nout/PI) + .5; |
| 639 |
> |
nazi = PI*nalt + .5; |
| 640 |
|
redistribute(il->sd, nalt, nazi, u, v, co->ad, xfm); |
| 641 |
+ |
done_discount(); |
| 642 |
+ |
if (!il->sampdens) |
| 643 |
+ |
il->sampdens = nalt*nazi/PI + .999; |
| 644 |
+ |
} |
| 645 |
|
/* write out the ring and its distribution */ |
| 646 |
|
if (average(il, distarr, n)) { |
| 647 |
|
if (il->sampdens > 0) |