| 349 |
|
double rv[2]; |
| 350 |
|
double d, sinp, cosp; |
| 351 |
|
COLOR scol; |
| 352 |
< |
int niter, ns2go; |
| 352 |
> |
int maxiter, ntrials, nstarget, nstaken; |
| 353 |
|
register int i; |
| 354 |
|
/* compute reflection */ |
| 355 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
| 356 |
|
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
| 357 |
< |
copycolor(scol, np->scolor); |
| 358 |
< |
ns2go = 1; |
| 357 |
> |
nstarget = 1; |
| 358 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
| 359 |
< |
ns2go = specjitter*r->rweight + .5; |
| 360 |
< |
if (sr.rweight <= minweight*ns2go) |
| 361 |
< |
ns2go = sr.rweight/minweight; |
| 362 |
< |
if (ns2go > 1) { |
| 363 |
< |
d = 1./ns2go; |
| 364 |
< |
scalecolor(scol, d); |
| 359 |
> |
nstarget = specjitter*r->rweight + .5; |
| 360 |
> |
if (sr.rweight <= minweight*nstarget) |
| 361 |
> |
nstarget = sr.rweight/minweight; |
| 362 |
> |
if (nstarget > 1) { |
| 363 |
> |
d = 1./nstarget; |
| 364 |
> |
scalecolor(sr.rcoef, d); |
| 365 |
|
sr.rweight *= d; |
| 366 |
|
} else |
| 367 |
< |
ns2go = 1; |
| 367 |
> |
nstarget = 1; |
| 368 |
|
} |
| 369 |
+ |
setcolor(scol, 0., 0., 0.); |
| 370 |
|
dimlist[ndims++] = (int)np->mp; |
| 371 |
< |
for (niter = ns2go*MAXITER; (ns2go > 0) & (niter > 0); niter--) { |
| 372 |
< |
if (specjitter > 1.5) |
| 371 |
> |
maxiter = MAXITER*nstarget; |
| 372 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
| 373 |
> |
ntrials < maxiter; ntrials++) { |
| 374 |
> |
if (ntrials) |
| 375 |
|
d = frandom(); |
| 376 |
|
else |
| 377 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
| 394 |
|
h[i] = np->pnorm[i] + |
| 395 |
|
d*(cosp*np->u[i] + sinp*np->v[i]); |
| 396 |
|
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
| 395 |
– |
if (d <= np->pdot + FTINY) |
| 396 |
– |
continue; |
| 397 |
|
VSUM(sr.rdir, r->rdir, h, d); |
| 398 |
< |
if (DOT(sr.rdir, r->ron) <= FTINY) |
| 398 |
> |
/* sample rejection test */ |
| 399 |
> |
if ((d = DOT(sr.rdir, r->ron)) <= FTINY) |
| 400 |
|
continue; |
| 401 |
|
checknorm(sr.rdir); |
| 402 |
< |
if (specjitter > 1.5) { /* adjusted W-G-M-D weight */ |
| 403 |
< |
d = 2.*(1. - np->pdot/d); |
| 404 |
< |
copycolor(sr.rcoef, scol); |
| 405 |
< |
scalecolor(sr.rcoef, d); |
| 406 |
< |
rayclear(&sr); |
| 402 |
> |
if (nstarget > 1) { /* W-G-M-D adjustment */ |
| 403 |
> |
if (nstaken) rayclear(&sr); |
| 404 |
> |
rayvalue(&sr); |
| 405 |
> |
d = 2./(1. + r->rod/d); |
| 406 |
> |
scalecolor(sr.rcol, d); |
| 407 |
> |
addcolor(scol, sr.rcol); |
| 408 |
> |
} else { |
| 409 |
> |
rayvalue(&sr); |
| 410 |
> |
multcolor(sr.rcol, sr.rcoef); |
| 411 |
> |
addcolor(r->rcol, sr.rcol); |
| 412 |
|
} |
| 413 |
< |
rayvalue(&sr); |
| 408 |
< |
multcolor(sr.rcol, sr.rcoef); |
| 409 |
< |
addcolor(r->rcol, sr.rcol); |
| 410 |
< |
--ns2go; |
| 413 |
> |
++nstaken; |
| 414 |
|
} |
| 415 |
+ |
if (nstarget > 1) { /* final W-G-M-D weighting */ |
| 416 |
+ |
multcolor(scol, sr.rcoef); |
| 417 |
+ |
d = (double)nstarget/ntrials; |
| 418 |
+ |
scalecolor(scol, d); |
| 419 |
+ |
addcolor(r->rcol, scol); |
| 420 |
+ |
} |
| 421 |
|
ndims--; |
| 422 |
|
} |
| 423 |
|
/* compute transmission */ |
| 425 |
|
scalecolor(sr.rcoef, np->tspec); |
| 426 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
| 427 |
|
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
| 428 |
< |
ns2go = 1; |
| 428 |
> |
nstarget = 1; |
| 429 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
| 430 |
< |
ns2go = specjitter*r->rweight + .5; |
| 431 |
< |
if (sr.rweight <= minweight*ns2go) |
| 432 |
< |
ns2go = sr.rweight/minweight; |
| 433 |
< |
if (ns2go > 1) { |
| 434 |
< |
d = 1./ns2go; |
| 430 |
> |
nstarget = specjitter*r->rweight + .5; |
| 431 |
> |
if (sr.rweight <= minweight*nstarget) |
| 432 |
> |
nstarget = sr.rweight/minweight; |
| 433 |
> |
if (nstarget > 1) { |
| 434 |
> |
d = 1./nstarget; |
| 435 |
|
scalecolor(sr.rcoef, d); |
| 436 |
|
sr.rweight *= d; |
| 437 |
|
} else |
| 438 |
< |
ns2go = 1; |
| 438 |
> |
nstarget = 1; |
| 439 |
|
} |
| 440 |
|
dimlist[ndims++] = (int)np->mp; |
| 441 |
< |
for (niter = ns2go*MAXITER; (ns2go > 0) & (niter > 0); niter--) { |
| 442 |
< |
if (specjitter > 1.5) |
| 441 |
> |
maxiter = MAXITER*nstarget; |
| 442 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
| 443 |
> |
ntrials < maxiter; ntrials++) { |
| 444 |
> |
if (ntrials) |
| 445 |
|
d = frandom(); |
| 446 |
|
else |
| 447 |
|
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
| 466 |
|
if (DOT(sr.rdir, r->ron) >= -FTINY) |
| 467 |
|
continue; |
| 468 |
|
normalize(sr.rdir); /* OK, normalize */ |
| 469 |
< |
if (specjitter > 1.5) /* multi-sampling */ |
| 469 |
> |
if (nstaken) /* multi-sampling */ |
| 470 |
|
rayclear(&sr); |
| 471 |
|
rayvalue(&sr); |
| 472 |
|
multcolor(sr.rcol, sr.rcoef); |
| 473 |
|
addcolor(r->rcol, sr.rcol); |
| 474 |
< |
--ns2go; |
| 474 |
> |
++nstaken; |
| 475 |
|
} |
| 476 |
|
ndims--; |
| 477 |
|
} |
