209 |
|
/* check threshold */ |
210 |
|
if (specthresh > FTINY && |
211 |
|
((specthresh >= 1.-FTINY || |
212 |
< |
specthresh + (.1 - .2*urand(8199+samplendx)) |
213 |
< |
> nd.rspec))) |
212 |
> |
specthresh + (.05 - .1*frandom()) > nd.rspec))) |
213 |
|
nd.specfl |= SP_RBLT; |
214 |
|
/* compute refl. direction */ |
215 |
|
for (i = 0; i < 3; i++) |
239 |
|
if (specthresh > FTINY && |
240 |
|
((specthresh >= 1.-FTINY || |
241 |
|
specthresh + |
242 |
< |
(.1 - .2*urand(7241+samplendx)) |
244 |
< |
> nd.tspec))) |
242 |
> |
(.05 - .1*frandom()) > nd.tspec))) |
243 |
|
nd.specfl |= SP_TBLT; |
244 |
|
if (r->crtype & SHADOW || |
245 |
|
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
248 |
|
} else { |
249 |
|
for (i = 0; i < 3; i++) /* perturb */ |
250 |
|
nd.prdir[i] = r->rdir[i] - |
251 |
< |
.75*r->pert[i]; |
251 |
> |
0.5*r->pert[i]; |
252 |
|
if (DOT(nd.prdir, r->ron) < -FTINY) |
253 |
|
normalize(nd.prdir); /* OK */ |
254 |
|
else |
387 |
|
ndims--; |
388 |
|
} |
389 |
|
/* compute transmission */ |
390 |
+ |
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
391 |
+ |
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
392 |
+ |
dimlist[ndims++] = (int)np->mp; |
393 |
+ |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
394 |
+ |
multisamp(rv, 2, d); |
395 |
+ |
d = 2.0*PI * rv[0]; |
396 |
+ |
cosp = cos(d); |
397 |
+ |
sinp = sin(d); |
398 |
+ |
rv[1] = 1.0 - specjitter*rv[1]; |
399 |
+ |
if (rv[1] <= FTINY) |
400 |
+ |
d = 1.0; |
401 |
+ |
else |
402 |
+ |
d = sqrt(-log(rv[1]) / |
403 |
+ |
(cosp*cosp*4./(np->u_alpha*np->u_alpha) + |
404 |
+ |
sinp*sinp*4./(np->v_alpha*np->v_alpha))); |
405 |
+ |
for (i = 0; i < 3; i++) |
406 |
+ |
sr.rdir[i] = np->prdir[i] + |
407 |
+ |
d*(cosp*np->u[i] + sinp*np->v[i]); |
408 |
+ |
if (DOT(sr.rdir, r->ron) < -FTINY) |
409 |
+ |
normalize(sr.rdir); /* OK, normalize */ |
410 |
+ |
else |
411 |
+ |
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
412 |
+ |
rayvalue(&sr); |
413 |
+ |
multcolor(sr.rcol, np->scolor); |
414 |
+ |
addcolor(r->rcol, sr.rcol); |
415 |
+ |
ndims--; |
416 |
+ |
} |
417 |
|
} |