51 |
|
short specfl; /* specularity flags, defined above */ |
52 |
|
COLOR mcolor; /* color of this material */ |
53 |
|
COLOR scolor; /* color of specular component */ |
54 |
+ |
FVECT vrefl; /* vector in reflected direction */ |
55 |
|
FVECT prdir; /* vector in transmitted direction */ |
56 |
|
FVECT u, v; /* u and v vectors orienting anisotropy */ |
57 |
|
double u_alpha; /* u roughness */ |
209 |
|
/* check threshold */ |
210 |
|
if (specthresh > FTINY && |
211 |
|
((specthresh >= 1.-FTINY || |
212 |
< |
specthresh + (.1 - .2*urand(8199+samplendx)) |
212 |
< |
> 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++) |
216 |
+ |
nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
217 |
+ |
if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
218 |
+ |
for (i = 0; i < 3; i++) /* safety measure */ |
219 |
+ |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
220 |
|
|
221 |
|
if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
222 |
|
RAY lr; |
223 |
|
if (rayorigin(&lr, r, REFLECTED, nd.rspec) == 0) { |
224 |
< |
for (i = 0; i < 3; i++) |
219 |
< |
lr.rdir[i] = r->rdir[i] + |
220 |
< |
2.0*nd.pdot*nd.pnorm[i]; |
224 |
> |
VCOPY(lr.rdir, nd.vrefl); |
225 |
|
rayvalue(&lr); |
226 |
|
multcolor(lr.rcol, nd.scolor); |
227 |
|
addcolor(r->rcol, lr.rcol); |
239 |
|
if (specthresh > FTINY && |
240 |
|
((specthresh >= 1.-FTINY || |
241 |
|
specthresh + |
242 |
< |
(.1 - .2*urand(7241+samplendx)) |
239 |
< |
> 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]; |
252 |
< |
normalize(nd.prdir); |
251 |
> |
0.5*r->pert[i]; |
252 |
> |
if (DOT(nd.prdir, r->ron) < -FTINY) |
253 |
> |
normalize(nd.prdir); /* OK */ |
254 |
> |
else |
255 |
> |
VCOPY(nd.prdir, r->rdir); |
256 |
|
} |
257 |
|
} |
258 |
|
} else |
353 |
|
FVECT h; |
354 |
|
double rv[2]; |
355 |
|
double d, sinp, cosp; |
350 |
– |
int ntries; |
356 |
|
register int i; |
357 |
|
/* compute reflection */ |
358 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
359 |
|
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
360 |
|
dimlist[ndims++] = (int)np->mp; |
361 |
< |
for (ntries = 0; ntries < 10; ntries++) { |
362 |
< |
dimlist[ndims] = ntries * 3601; |
363 |
< |
d = urand(ilhash(dimlist,ndims+1)+samplendx); |
364 |
< |
multisamp(rv, 2, d); |
365 |
< |
d = 2.0*PI * rv[0]; |
366 |
< |
cosp = np->u_alpha * cos(d); |
367 |
< |
sinp = np->v_alpha * sin(d); |
368 |
< |
d = sqrt(cosp*cosp + sinp*sinp); |
369 |
< |
cosp /= d; |
370 |
< |
sinp /= d; |
371 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
372 |
< |
if (rv[1] <= FTINY) |
373 |
< |
d = 1.0; |
374 |
< |
else |
375 |
< |
d = sqrt(-log(rv[1]) / |
376 |
< |
(cosp*cosp/(np->u_alpha*np->u_alpha) + |
377 |
< |
sinp*sinp/(np->v_alpha*np->v_alpha))); |
378 |
< |
for (i = 0; i < 3; i++) |
379 |
< |
h[i] = np->pnorm[i] + |
380 |
< |
d*(cosp*np->u[i] + sinp*np->v[i]); |
381 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
382 |
< |
for (i = 0; i < 3; i++) |
383 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
384 |
< |
if (DOT(sr.rdir, r->ron) > FTINY) { |
385 |
< |
rayvalue(&sr); |
386 |
< |
multcolor(sr.rcol, np->scolor); |
382 |
< |
addcolor(r->rcol, sr.rcol); |
383 |
< |
break; |
384 |
< |
} |
385 |
< |
} |
361 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
362 |
> |
multisamp(rv, 2, d); |
363 |
> |
d = 2.0*PI * rv[0]; |
364 |
> |
cosp = np->u_alpha * cos(d); |
365 |
> |
sinp = np->v_alpha * sin(d); |
366 |
> |
d = sqrt(cosp*cosp + sinp*sinp); |
367 |
> |
cosp /= d; |
368 |
> |
sinp /= d; |
369 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
370 |
> |
if (rv[1] <= FTINY) |
371 |
> |
d = 1.0; |
372 |
> |
else |
373 |
> |
d = sqrt(-log(rv[1]) / |
374 |
> |
(cosp*cosp/(np->u_alpha*np->u_alpha) + |
375 |
> |
sinp*sinp/(np->v_alpha*np->v_alpha))); |
376 |
> |
for (i = 0; i < 3; i++) |
377 |
> |
h[i] = np->pnorm[i] + |
378 |
> |
d*(cosp*np->u[i] + sinp*np->v[i]); |
379 |
> |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
380 |
> |
for (i = 0; i < 3; i++) |
381 |
> |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
382 |
> |
if (DOT(sr.rdir, r->ron) <= FTINY) /* penetration? */ |
383 |
> |
VCOPY(sr.rdir, np->vrefl); /* jitter no good */ |
384 |
> |
rayvalue(&sr); |
385 |
> |
multcolor(sr.rcol, np->scolor); |
386 |
> |
addcolor(r->rcol, sr.rcol); |
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 |
|
} |