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[0]), |
265 |
< |
varvalue(m->oargs.sarg[1]), |
266 |
< |
varvalue(m->oargs.sarg[2])); |
267 |
< |
scalecolor(ctmp, nd.tspec); |
264 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[3]), |
265 |
> |
varvalue(m->oargs.sarg[4]), |
266 |
> |
varvalue(m->oargs.sarg[5])); |
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[3]), |
297 |
< |
varvalue(m->oargs.sarg[4]), |
298 |
< |
varvalue(m->oargs.sarg[5])); |
299 |
< |
scalecolor(ctmp, nd.rspec); |
296 |
> |
setcolor(ctmp, varvalue(m->oargs.sarg[0]), |
297 |
> |
varvalue(m->oargs.sarg[1]), |
298 |
> |
varvalue(m->oargs.sarg[2])); |
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); |
343 |
|
varset("NxP", '=', vec[0]/funcxf.sca); |
344 |
|
varset("NyP", '=', vec[1]/funcxf.sca); |
345 |
|
varset("NzP", '=', vec[2]/funcxf.sca); |
346 |
< |
varset("RdotP", '=', np->pdot); |
346 |
> |
varset("RdotP", '=', np->pdot <= -1.0 ? -1.0 : |
347 |
> |
np->pdot >= 1.0 ? 1.0 : np->pdot); |
348 |
|
varset("CrP", '=', colval(np->mcolor,RED)); |
349 |
|
varset("CgP", '=', colval(np->mcolor,GRN)); |
350 |
|
varset("CbP", '=', colval(np->mcolor,BLU)); |