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 |
246 |
|
break; |
247 |
|
if (i-3 != nd.dp->nd) |
248 |
|
objerror(m, USER, "dimension error"); |
249 |
< |
if (!fundefined(m->oargs.sarg[3])) |
252 |
< |
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])) |
256 |
< |
loadfunc(m->oargs.sarg[9]); |
252 |
> |
funcfile(m->oargs.sarg[9]); |
253 |
|
} else { |
254 |
|
nd.dp = NULL; |
255 |
< |
if (!fundefined(m->oargs.sarg[0])) |
260 |
< |
loadfunc(m->oargs.sarg[1]); |
255 |
> |
funcfile(m->oargs.sarg[1]); |
256 |
|
} |
257 |
|
/* set special variables */ |
258 |
< |
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)); |
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])); |
309 |
< |
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) |
326 |
< |
scalecolor(ctmp, nd.rdiff); |
327 |
< |
else |
328 |
< |
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) |
336 |
< |
scalecolor(ctmp, nd.tdiff); |
337 |
< |
else |
338 |
< |
scalecolor(ctmp, nd.trans); |
321 |
> |
scalecolor(ctmp, dtmp); |
322 |
|
multcolor(ctmp, nd.mcolor); |
323 |
|
addcolor(r->rcol, ctmp); |
324 |
|
flipsurface(r); |
328 |
|
/* check distance */ |
329 |
|
if (transtest > bright(r->rcol)) |
330 |
|
r->rt = transdist; |
331 |
+ |
} |
332 |
+ |
|
333 |
+ |
|
334 |
+ |
setbrdfunc(np) /* set up brdf function and variables */ |
335 |
+ |
register BRDFDAT *np; |
336 |
+ |
{ |
337 |
+ |
FVECT vec; |
338 |
+ |
|
339 |
+ |
if (setfunc(np->mp, np->pr) == 0) |
340 |
+ |
return(0); /* it's OK, setfunc says we're done */ |
341 |
+ |
/* else (re)assign special variables */ |
342 |
+ |
multv3(vec, np->pnorm, funcxf.xfm); |
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 <= -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)); |
351 |
+ |
return(1); |
352 |
|
} |