| 191 |
|
BRDFDAT nd; |
| 192 |
|
double transtest, transdist; |
| 193 |
|
COLOR ctmp; |
| 194 |
< |
double dtmp; |
| 194 |
> |
double dtmp, tspect, rspecr; |
| 195 |
|
register int i; |
| 196 |
|
/* check arguments */ |
| 197 |
|
switch (m->otype) { |
| 246 |
|
break; |
| 247 |
|
if (i-3 != nd.dp->nd) |
| 248 |
|
objerror(m, USER, "dimension error"); |
| 249 |
< |
if (!fundefined(m->oargs.sarg[3])) |
| 250 |
< |
loadfunc(m->oargs.sarg[2]); |
| 249 |
> |
funcfile(m->oargs.sarg[2]); |
| 250 |
|
} else if (m->otype == MAT_BRTDF) { |
| 251 |
|
nd.dp = NULL; |
| 252 |
< |
if (!fundefined(m->oargs.sarg[7])) |
| 254 |
< |
loadfunc(m->oargs.sarg[9]); |
| 252 |
> |
funcfile(m->oargs.sarg[9]); |
| 253 |
|
} else { |
| 254 |
|
nd.dp = NULL; |
| 255 |
< |
if (!fundefined(m->oargs.sarg[0])) |
| 258 |
< |
loadfunc(m->oargs.sarg[1]); |
| 255 |
> |
funcfile(m->oargs.sarg[1]); |
| 256 |
|
} |
| 257 |
|
/* set special variables */ |
| 258 |
|
setbrdfunc(&nd); |
| 259 |
|
/* compute transmitted ray */ |
| 260 |
+ |
tspect = 0.; |
| 261 |
|
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
| 262 |
|
RAY sr; |
| 263 |
|
errno = 0; |
| 264 |
|
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
| 265 |
|
varvalue(m->oargs.sarg[4]), |
| 266 |
|
varvalue(m->oargs.sarg[5])); |
| 267 |
< |
scalecolor(ctmp, nd.tspec); |
| 267 |
> |
scalecolor(ctmp, nd.trans); |
| 268 |
|
if (errno) |
| 269 |
|
objerror(m, WARNING, "compute error"); |
| 270 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 271 |
< |
rayorigin(&sr, r, TRANS, dtmp) == 0) { |
| 272 |
< |
if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 270 |
> |
else if ((tspect = bright(ctmp)) > FTINY && |
| 271 |
> |
rayorigin(&sr, r, TRANS, tspect) == 0) { |
| 272 |
> |
if (!(r->crtype & SHADOW) && |
| 273 |
> |
DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 274 |
|
for (i = 0; i < 3; i++) /* perturb direction */ |
| 275 |
|
sr.rdir[i] = r->rdir[i] - |
| 276 |
|
.75*r->pert[i]; |
| 289 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 290 |
|
return; |
| 291 |
|
/* compute reflected ray */ |
| 292 |
+ |
rspecr = 0.; |
| 293 |
|
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
| 294 |
|
RAY sr; |
| 295 |
|
errno = 0; |
| 296 |
|
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
| 297 |
|
varvalue(m->oargs.sarg[1]), |
| 298 |
|
varvalue(m->oargs.sarg[2])); |
| 299 |
– |
scalecolor(ctmp, nd.rspec); |
| 299 |
|
if (errno) |
| 300 |
|
objerror(m, WARNING, "compute error"); |
| 301 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 302 |
< |
rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
| 301 |
> |
else if ((rspecr = bright(ctmp)) > FTINY && |
| 302 |
> |
rayorigin(&sr, r, REFLECTED, rspecr) == 0) { |
| 303 |
|
for (i = 0; i < 3; i++) |
| 304 |
|
sr.rdir[i] = r->rdir[i] + |
| 305 |
|
2.0*nd.pdot*nd.pnorm[i]; |
| 309 |
|
} |
| 310 |
|
} |
| 311 |
|
/* compute ambient */ |
| 312 |
< |
if (nd.rdiff > FTINY) { |
| 312 |
> |
if ((dtmp = 1.0-nd.trans-rspecr) > FTINY) { |
| 313 |
|
ambient(ctmp, r); |
| 314 |
< |
if (m->otype == MAT_BRTDF) |
| 316 |
< |
scalecolor(ctmp, nd.rdiff); |
| 317 |
< |
else |
| 318 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
| 314 |
> |
scalecolor(ctmp, dtmp); |
| 315 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 316 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 317 |
|
} |
| 318 |
< |
if (nd.tdiff > FTINY) { /* from other side */ |
| 318 |
> |
if ((dtmp = nd.trans-tspect) > FTINY) { /* from other side */ |
| 319 |
|
flipsurface(r); |
| 320 |
|
ambient(ctmp, r); |
| 321 |
< |
if (m->otype == MAT_BRTDF) |
| 326 |
< |
scalecolor(ctmp, nd.tdiff); |
| 327 |
< |
else |
| 328 |
< |
scalecolor(ctmp, nd.trans); |
| 321 |
> |
scalecolor(ctmp, dtmp); |
| 322 |
|
multcolor(ctmp, nd.mcolor); |
| 323 |
|
addcolor(r->rcol, ctmp); |
| 324 |
|
flipsurface(r); |
