43 |
|
/* specularity flags */ |
44 |
|
#define SP_REFL 01 /* has reflected specular component */ |
45 |
|
#define SP_TRAN 02 /* has transmitted specular */ |
46 |
< |
#define SP_PURE 010 /* purely specular (zero roughness) */ |
47 |
< |
#define SP_FLAT 020 /* flat reflecting surface */ |
48 |
< |
#define SP_RBLT 040 /* reflection below sample threshold */ |
49 |
< |
#define SP_TBLT 0100 /* transmission below threshold */ |
46 |
> |
#define SP_PURE 04 /* purely specular (zero roughness) */ |
47 |
> |
#define SP_FLAT 010 /* flat reflecting surface */ |
48 |
> |
#define SP_RBLT 020 /* reflection below sample threshold */ |
49 |
> |
#define SP_TBLT 040 /* transmission below threshold */ |
50 |
|
|
51 |
|
typedef struct { |
52 |
|
OBJREC *mp; /* material pointer */ |
128 |
|
* is always modified by material color. |
129 |
|
*/ |
130 |
|
/* roughness + source */ |
131 |
< |
dtmp = np->alpha2 + omega/(2.0*PI); |
131 |
> |
dtmp = np->alpha2/2.0 + omega/(2.0*PI); |
132 |
|
/* gaussian */ |
133 |
|
dtmp = exp((DOT(np->prdir,ldir)-1.)/dtmp)/(2.*PI)/dtmp; |
134 |
|
/* worth using? */ |
194 |
|
/* check threshold */ |
195 |
|
if (specthresh > FTINY && |
196 |
|
((specthresh >= 1.-FTINY || |
197 |
< |
specthresh + (.1 - .2*urand(8199+samplendx)) |
198 |
< |
> nd.rspec))) |
197 |
> |
specthresh + (.05 - .1*frandom()) > nd.rspec))) |
198 |
|
nd.specfl |= SP_RBLT; |
199 |
|
/* compute reflected ray */ |
200 |
|
for (i = 0; i < 3; i++) |
224 |
|
if (specthresh > FTINY && |
225 |
|
((specthresh >= 1.-FTINY || |
226 |
|
specthresh + |
227 |
< |
(.1 - .2*urand(7241+samplendx)) |
229 |
< |
> nd.tspec))) |
227 |
> |
(.05 - .1*frandom()) > nd.tspec))) |
228 |
|
nd.specfl |= SP_TBLT; |
229 |
|
if (r->crtype & SHADOW || |
230 |
|
DOT(r->pert,r->pert) <= FTINY*FTINY) { |
233 |
|
} else { |
234 |
|
for (i = 0; i < 3; i++) /* perturb */ |
235 |
|
nd.prdir[i] = r->rdir[i] - |
236 |
< |
.75*r->pert[i]; |
236 |
> |
0.5*r->pert[i]; |
237 |
|
if (DOT(nd.prdir, r->ron) < -FTINY) |
238 |
|
normalize(nd.prdir); /* OK */ |
239 |
|
else |
254 |
|
transtest *= bright(lr.rcol); |
255 |
|
transdist = r->rot + lr.rt; |
256 |
|
} |
257 |
< |
} |
257 |
> |
} else |
258 |
> |
transtest = 0; |
259 |
|
|
260 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
261 |
|
return; |
345 |
|
ndims--; |
346 |
|
} |
347 |
|
/* compute transmission */ |
348 |
+ |
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
349 |
+ |
rayorigin(&sr, r, SPECULAR, np->tspec) == 0) { |
350 |
+ |
dimlist[ndims++] = (int)np->mp; |
351 |
+ |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
352 |
+ |
multisamp(rv, 2, d); |
353 |
+ |
d = 2.0*PI * rv[0]; |
354 |
+ |
cosp = cos(d); |
355 |
+ |
sinp = sin(d); |
356 |
+ |
rv[1] = 1.0 - specjitter*rv[1]; |
357 |
+ |
if (rv[1] <= FTINY) |
358 |
+ |
d = 1.0; |
359 |
+ |
else |
360 |
+ |
d = sqrt( np->alpha2/4.0 * -log(rv[1]) ); |
361 |
+ |
for (i = 0; i < 3; i++) |
362 |
+ |
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
363 |
+ |
if (DOT(sr.rdir, r->ron) < -FTINY) |
364 |
+ |
normalize(sr.rdir); /* OK, normalize */ |
365 |
+ |
else |
366 |
+ |
VCOPY(sr.rdir, np->prdir); /* else no jitter */ |
367 |
+ |
rayvalue(&sr); |
368 |
+ |
scalecolor(sr.rcol, np->tspec); |
369 |
+ |
multcolor(sr.rcol, np->mcolor); /* modified by color */ |
370 |
+ |
addcolor(r->rcol, sr.rcol); |
371 |
+ |
ndims--; |
372 |
+ |
} |
373 |
|
} |