192 |
|
colval(nd.scolor,i) += (1.0-colval(nd.scolor,i))*dtmp; |
193 |
|
nd.rspec += (1.0-nd.rspec)*dtmp; |
194 |
|
/* check threshold */ |
195 |
< |
if (nd.rspec <= specthresh+FTINY) |
195 |
> |
if (specthresh > FTINY && |
196 |
> |
((specthresh >= 1.-FTINY || |
197 |
> |
specthresh + (.1 - .2*urand(8199+samplendx)) |
198 |
> |
> nd.rspec))) |
199 |
|
nd.specfl |= SP_RBLT; |
200 |
|
/* compute reflected ray */ |
201 |
|
for (i = 0; i < 3; i++) |
202 |
|
nd.vrefl[i] = r->rdir[i] + 2.0*nd.pdot*nd.pnorm[i]; |
203 |
+ |
if (DOT(nd.vrefl, r->ron) <= FTINY) /* penetration? */ |
204 |
+ |
for (i = 0; i < 3; i++) /* safety measure */ |
205 |
+ |
nd.vrefl[i] = r->rdir[i] + 2.*r->rod*r->ron[i]; |
206 |
|
|
207 |
|
if (!(r->crtype & SHADOW) && nd.specfl & SP_PURE) { |
208 |
|
RAY lr; |
222 |
|
if (nd.tspec > FTINY) { |
223 |
|
nd.specfl |= SP_TRAN; |
224 |
|
/* check threshold */ |
225 |
< |
if (nd.tspec <= specthresh+FTINY) |
225 |
> |
if (specthresh > FTINY && |
226 |
> |
((specthresh >= 1.-FTINY || |
227 |
> |
specthresh + |
228 |
> |
(.1 - .2*urand(7241+samplendx)) |
229 |
> |
> nd.tspec))) |
230 |
|
nd.specfl |= SP_TBLT; |
231 |
|
if (r->crtype & SHADOW || |
232 |
|
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
236 |
|
for (i = 0; i < 3; i++) /* perturb */ |
237 |
|
nd.prdir[i] = r->rdir[i] - |
238 |
|
.75*r->pert[i]; |
239 |
< |
normalize(nd.prdir); |
239 |
> |
if (DOT(nd.prdir, r->ron) < -FTINY) |
240 |
> |
normalize(nd.prdir); /* OK */ |
241 |
> |
else |
242 |
> |
VCOPY(nd.prdir, r->rdir); |
243 |
|
} |
244 |
|
} |
245 |
|
} else |
309 |
|
FVECT u, v, h; |
310 |
|
double rv[2]; |
311 |
|
double d, sinp, cosp; |
299 |
– |
int ntries; |
312 |
|
register int i; |
313 |
|
/* set up sample coordinates */ |
314 |
|
v[0] = v[1] = v[2] = 0.0; |
323 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
324 |
|
rayorigin(&sr, r, SPECULAR, np->rspec) == 0) { |
325 |
|
dimlist[ndims++] = (int)np->mp; |
326 |
< |
for (ntries = 0; ntries < 10; ntries++) { |
327 |
< |
dimlist[ndims] = ntries * 8912; |
328 |
< |
d = urand(ilhash(dimlist,ndims+1)+samplendx); |
329 |
< |
multisamp(rv, 2, d); |
330 |
< |
d = 2.0*PI * rv[0]; |
331 |
< |
cosp = cos(d); |
332 |
< |
sinp = sin(d); |
333 |
< |
rv[1] = 1.0 - specjitter*rv[1]; |
334 |
< |
if (rv[1] <= FTINY) |
335 |
< |
d = 1.0; |
336 |
< |
else |
337 |
< |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
338 |
< |
for (i = 0; i < 3; i++) |
339 |
< |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
340 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
341 |
< |
for (i = 0; i < 3; i++) |
342 |
< |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
343 |
< |
if (DOT(sr.rdir, r->ron) > FTINY) { |
344 |
< |
rayvalue(&sr); |
345 |
< |
multcolor(sr.rcol, np->scolor); |
334 |
< |
addcolor(r->rcol, sr.rcol); |
335 |
< |
break; |
336 |
< |
} |
337 |
< |
} |
326 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
327 |
> |
multisamp(rv, 2, d); |
328 |
> |
d = 2.0*PI * rv[0]; |
329 |
> |
cosp = cos(d); |
330 |
> |
sinp = sin(d); |
331 |
> |
rv[1] = 1.0 - specjitter*rv[1]; |
332 |
> |
if (rv[1] <= FTINY) |
333 |
> |
d = 1.0; |
334 |
> |
else |
335 |
> |
d = sqrt( np->alpha2 * -log(rv[1]) ); |
336 |
> |
for (i = 0; i < 3; i++) |
337 |
> |
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
338 |
> |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
339 |
> |
for (i = 0; i < 3; i++) |
340 |
> |
sr.rdir[i] = r->rdir[i] + d*h[i]; |
341 |
> |
if (DOT(sr.rdir, r->ron) <= FTINY) |
342 |
> |
VCOPY(sr.rdir, np->vrefl); /* jitter no good */ |
343 |
> |
rayvalue(&sr); |
344 |
> |
multcolor(sr.rcol, np->scolor); |
345 |
> |
addcolor(r->rcol, sr.rcol); |
346 |
|
ndims--; |
347 |
|
} |
348 |
|
/* compute transmission */ |