| 122 |
|
if (ldot > 0.0 ? np->rspec <= FTINY : np->tspec <= FTINY) |
| 123 |
|
return; /* no specular component */ |
| 124 |
|
/* set up function */ |
| 125 |
< |
setfunc(np->mp, np->pr); |
| 125 |
> |
setbrdfunc(np); |
| 126 |
|
sa = np->mp->oargs.sarg; |
| 127 |
|
errno = 0; |
| 128 |
|
/* transform light vector */ |
| 191 |
|
BRDFDAT nd; |
| 192 |
|
double transtest, transdist; |
| 193 |
|
COLOR ctmp; |
| 194 |
< |
double dtmp; |
| 195 |
< |
FVECT vec; |
| 194 |
> |
double dtmp, tspect, rspecr; |
| 195 |
|
register int i; |
| 196 |
|
/* check arguments */ |
| 197 |
|
switch (m->otype) { |
| 236 |
|
raytexture(r, m->omod); |
| 237 |
|
nd.pdot = raynormal(nd.pnorm, r); /* perturb normal */ |
| 238 |
|
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
| 240 |
– |
r->rt = r->rot; /* default ray length */ |
| 239 |
|
transtest = 0; |
| 240 |
|
/* load auxiliary files */ |
| 241 |
|
if (m->otype == MAT_PDATA || m->otype == MAT_MDATA |
| 258 |
|
loadfunc(m->oargs.sarg[1]); |
| 259 |
|
} |
| 260 |
|
/* set special variables */ |
| 261 |
< |
setfunc(m, r); |
| 264 |
< |
multv3(vec, nd.pnorm, funcxf.xfm); |
| 265 |
< |
varset("NxP", '=', vec[0]/funcxf.sca); |
| 266 |
< |
varset("NyP", '=', vec[1]/funcxf.sca); |
| 267 |
< |
varset("NzP", '=', vec[2]/funcxf.sca); |
| 268 |
< |
varset("RdotP", '=', nd.pdot); |
| 269 |
< |
varset("CrP", '=', colval(nd.mcolor,RED)); |
| 270 |
< |
varset("CgP", '=', colval(nd.mcolor,GRN)); |
| 271 |
< |
varset("CbP", '=', colval(nd.mcolor,BLU)); |
| 261 |
> |
setbrdfunc(&nd); |
| 262 |
|
/* compute transmitted ray */ |
| 263 |
+ |
tspect = 0.; |
| 264 |
|
if (m->otype == MAT_BRTDF && nd.tspec > FTINY) { |
| 265 |
|
RAY sr; |
| 266 |
|
errno = 0; |
| 267 |
< |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
| 268 |
< |
varvalue(m->oargs.sarg[1]), |
| 269 |
< |
varvalue(m->oargs.sarg[2])); |
| 267 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
| 268 |
> |
varvalue(m->oargs.sarg[4]), |
| 269 |
> |
varvalue(m->oargs.sarg[5])); |
| 270 |
|
scalecolor(ctmp, nd.tspec); |
| 271 |
|
if (errno) |
| 272 |
|
objerror(m, WARNING, "compute error"); |
| 273 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 274 |
< |
rayorigin(&sr, r, TRANS, dtmp) == 0) { |
| 273 |
> |
else if ((tspect = bright(ctmp)) > FTINY && |
| 274 |
> |
rayorigin(&sr, r, TRANS, tspect) == 0) { |
| 275 |
|
if (DOT(r->pert,r->pert) > FTINY*FTINY) { |
| 276 |
|
for (i = 0; i < 3; i++) /* perturb direction */ |
| 277 |
|
sr.rdir[i] = r->rdir[i] - |
| 278 |
|
.75*r->pert[i]; |
| 279 |
|
normalize(sr.rdir); |
| 280 |
< |
} else |
| 280 |
> |
} else { |
| 281 |
> |
VCOPY(sr.rdir, r->rdir); |
| 282 |
|
transtest = 2; |
| 283 |
+ |
} |
| 284 |
|
rayvalue(&sr); |
| 285 |
|
multcolor(sr.rcol, ctmp); |
| 286 |
|
addcolor(r->rcol, sr.rcol); |
| 291 |
|
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 292 |
|
return; |
| 293 |
|
/* compute reflected ray */ |
| 294 |
+ |
rspecr = 0.; |
| 295 |
|
if (m->otype == MAT_BRTDF && nd.rspec > FTINY) { |
| 296 |
|
RAY sr; |
| 297 |
|
errno = 0; |
| 298 |
< |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
| 299 |
< |
varvalue(m->oargs.sarg[4]), |
| 300 |
< |
varvalue(m->oargs.sarg[5])); |
| 298 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
| 299 |
> |
varvalue(m->oargs.sarg[1]), |
| 300 |
> |
varvalue(m->oargs.sarg[2])); |
| 301 |
|
scalecolor(ctmp, nd.rspec); |
| 302 |
|
if (errno) |
| 303 |
|
objerror(m, WARNING, "compute error"); |
| 304 |
< |
else if ((dtmp = bright(ctmp)) > FTINY && |
| 305 |
< |
rayorigin(&sr, r, REFLECTED, dtmp) == 0) { |
| 304 |
> |
else if ((rspecr = bright(ctmp)) > FTINY && |
| 305 |
> |
rayorigin(&sr, r, REFLECTED, rspecr) == 0) { |
| 306 |
|
for (i = 0; i < 3; i++) |
| 307 |
|
sr.rdir[i] = r->rdir[i] + |
| 308 |
|
2.0*nd.pdot*nd.pnorm[i]; |
| 312 |
|
} |
| 313 |
|
} |
| 314 |
|
/* compute ambient */ |
| 315 |
< |
if (nd.rdiff > FTINY) { |
| 315 |
> |
if ((dtmp = 1.0-nd.trans-rspecr) > FTINY) { |
| 316 |
|
ambient(ctmp, r); |
| 317 |
< |
if (m->otype == MAT_BRTDF) |
| 324 |
< |
scalecolor(ctmp, nd.rdiff); |
| 325 |
< |
else |
| 326 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
| 317 |
> |
scalecolor(ctmp, dtmp); |
| 318 |
|
multcolor(ctmp, nd.mcolor); /* modified by material color */ |
| 319 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
| 320 |
|
} |
| 321 |
< |
if (nd.tdiff > FTINY) { /* from other side */ |
| 321 |
> |
if ((dtmp = nd.trans-tspect) > FTINY) { /* from other side */ |
| 322 |
|
flipsurface(r); |
| 323 |
|
ambient(ctmp, r); |
| 324 |
< |
if (m->otype == MAT_BRTDF) |
| 334 |
< |
scalecolor(ctmp, nd.tdiff); |
| 335 |
< |
else |
| 336 |
< |
scalecolor(ctmp, nd.trans); |
| 324 |
> |
scalecolor(ctmp, dtmp); |
| 325 |
|
multcolor(ctmp, nd.mcolor); |
| 326 |
|
addcolor(r->rcol, ctmp); |
| 327 |
|
flipsurface(r); |
| 331 |
|
/* check distance */ |
| 332 |
|
if (transtest > bright(r->rcol)) |
| 333 |
|
r->rt = transdist; |
| 334 |
+ |
} |
| 335 |
+ |
|
| 336 |
+ |
|
| 337 |
+ |
setbrdfunc(np) /* set up brdf function and variables */ |
| 338 |
+ |
register BRDFDAT *np; |
| 339 |
+ |
{ |
| 340 |
+ |
FVECT vec; |
| 341 |
+ |
|
| 342 |
+ |
if (setfunc(np->mp, np->pr) == 0) |
| 343 |
+ |
return(0); /* it's OK, setfunc says we're done */ |
| 344 |
+ |
/* else (re)assign special variables */ |
| 345 |
+ |
multv3(vec, np->pnorm, funcxf.xfm); |
| 346 |
+ |
varset("NxP", '=', vec[0]/funcxf.sca); |
| 347 |
+ |
varset("NyP", '=', vec[1]/funcxf.sca); |
| 348 |
+ |
varset("NzP", '=', vec[2]/funcxf.sca); |
| 349 |
+ |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
| 350 |
+ |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
| 351 |
+ |
varset("CrP", '=', colval(np->mcolor,RED)); |
| 352 |
+ |
varset("CgP", '=', colval(np->mcolor,GRN)); |
| 353 |
+ |
varset("CbP", '=', colval(np->mcolor,BLU)); |
| 354 |
+ |
return(1); |
| 355 |
|
} |
