25 |
|
#define MAXITER 10 /* maximum # specular ray attempts */ |
26 |
|
#endif |
27 |
|
/* estimate of Fresnel function */ |
28 |
< |
#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00287989916) |
28 |
> |
#define FRESNE(ci) (exp(-5.85*(ci)) - 0.00202943064) |
29 |
|
#define FRESTHRESH 0.017999 /* minimum specularity for approx. */ |
30 |
|
|
31 |
|
|
54 |
|
OBJREC *mp; /* material pointer */ |
55 |
|
RAY *rp; /* ray pointer */ |
56 |
|
short specfl; /* specularity flags, defined above */ |
57 |
< |
COLOR mcolor; /* color of this material */ |
58 |
< |
COLOR scolor; /* color of specular component */ |
57 |
> |
SCOLOR mcolor; /* color of this material */ |
58 |
> |
SCOLOR scolor; /* color of specular component */ |
59 |
|
FVECT vrefl; /* vector in direction of reflected ray */ |
60 |
|
FVECT prdir; /* vector in transmitted direction */ |
61 |
|
double alpha2; /* roughness squared */ |
71 |
|
|
72 |
|
static void |
73 |
|
dirnorm( /* compute source contribution */ |
74 |
< |
COLOR cval, /* returned coefficient */ |
74 |
> |
SCOLOR scval, /* returned coefficient */ |
75 |
|
void *nnp, /* material data */ |
76 |
|
FVECT ldir, /* light source direction */ |
77 |
|
double omega /* light source size */ |
82 |
|
double lrdiff, ltdiff; |
83 |
|
double dtmp, d2, d3, d4; |
84 |
|
FVECT vtmp; |
85 |
< |
COLOR ctmp; |
85 |
> |
SCOLOR sctmp; |
86 |
|
|
87 |
< |
setcolor(cval, 0.0, 0.0, 0.0); |
87 |
> |
scolorblack(scval); |
88 |
|
|
89 |
|
ldot = DOT(np->pnorm, ldir); |
90 |
|
|
101 |
|
ltdiff *= dtmp; |
102 |
|
} |
103 |
|
|
104 |
< |
if (ldot > FTINY && lrdiff > FTINY) { |
104 |
> |
if ((ldot > FTINY) & (lrdiff > FTINY)) { |
105 |
|
/* |
106 |
|
* Compute and add diffuse reflected component to returned |
107 |
|
* color. The diffuse reflected component will always be |
108 |
|
* modified by the color of the material. |
109 |
|
*/ |
110 |
< |
copycolor(ctmp, np->mcolor); |
110 |
> |
copyscolor(sctmp, np->mcolor); |
111 |
|
dtmp = ldot * omega * lrdiff * (1.0/PI); |
112 |
< |
scalecolor(ctmp, dtmp); |
113 |
< |
addcolor(cval, ctmp); |
112 |
> |
scalescolor(sctmp, dtmp); |
113 |
> |
saddscolor(scval, sctmp); |
114 |
|
} |
115 |
|
|
116 |
< |
if (ldot < -FTINY && ltdiff > FTINY) { |
116 |
> |
if ((ldot < -FTINY) & (ltdiff > FTINY)) { |
117 |
|
/* |
118 |
|
* Compute diffuse transmission. |
119 |
|
*/ |
120 |
< |
copycolor(ctmp, np->mcolor); |
120 |
> |
copyscolor(sctmp, np->mcolor); |
121 |
|
dtmp = -ldot * omega * ltdiff * (1.0/PI); |
122 |
< |
scalecolor(ctmp, dtmp); |
123 |
< |
addcolor(cval, ctmp); |
122 |
> |
scalescolor(sctmp, dtmp); |
123 |
> |
saddscolor(scval, sctmp); |
124 |
|
} |
125 |
|
|
126 |
|
if (ambRayInPmap(np->rp)) |
127 |
|
return; /* specular already in photon map */ |
128 |
|
|
129 |
< |
if (ldot > FTINY && (np->specfl&(SP_REFL|SP_PURE)) == SP_REFL) { |
129 |
> |
if ((ldot > FTINY) & ((np->specfl&(SP_REFL|SP_PURE)) == SP_REFL)) { |
130 |
|
/* |
131 |
|
* Compute specular reflection coefficient using |
132 |
|
* Gaussian distribution model. |
146 |
|
dtmp = exp(-d4/dtmp) * d3 / (PI * d2*d2 * dtmp); |
147 |
|
/* worth using? */ |
148 |
|
if (dtmp > FTINY) { |
149 |
< |
copycolor(ctmp, np->scolor); |
149 |
> |
copyscolor(sctmp, np->scolor); |
150 |
|
dtmp *= ldot * omega; |
151 |
< |
scalecolor(ctmp, dtmp); |
152 |
< |
addcolor(cval, ctmp); |
151 |
> |
scalescolor(sctmp, dtmp); |
152 |
> |
saddscolor(scval, sctmp); |
153 |
|
} |
154 |
|
} |
155 |
|
|
156 |
|
|
157 |
< |
if (ldot < -FTINY && (np->specfl&(SP_TRAN|SP_PURE)) == SP_TRAN) { |
157 |
> |
if ((ldot < -FTINY) & ((np->specfl&(SP_TRAN|SP_PURE)) == SP_TRAN)) { |
158 |
|
/* |
159 |
|
* Compute specular transmission. Specular transmission |
160 |
|
* is always modified by material color. |
165 |
|
dtmp = exp((2.*DOT(np->prdir,ldir)-2.)/dtmp)/(PI*dtmp); |
166 |
|
/* worth using? */ |
167 |
|
if (dtmp > FTINY) { |
168 |
< |
copycolor(ctmp, np->mcolor); |
168 |
> |
copyscolor(sctmp, np->mcolor); |
169 |
|
dtmp *= np->tspec * omega * sqrt(-ldot/np->pdot); |
170 |
< |
scalecolor(ctmp, dtmp); |
171 |
< |
addcolor(cval, ctmp); |
170 |
> |
scalescolor(sctmp, dtmp); |
171 |
> |
saddscolor(scval, sctmp); |
172 |
|
} |
173 |
|
} |
174 |
|
} |
182 |
|
{ |
183 |
|
NORMDAT nd; |
184 |
|
double fest; |
185 |
– |
double transtest, transdist; |
186 |
– |
double mirtest, mirdist; |
185 |
|
int hastexture; |
186 |
|
double d; |
187 |
< |
COLOR ctmp; |
187 |
> |
SCOLOR sctmp; |
188 |
|
int i; |
189 |
|
|
190 |
|
/* PMAP: skip transmitted shadow ray if accounted for in photon map */ |
191 |
+ |
/* No longer needed? |
192 |
|
if (shadowRayInPmap(r) || ambRayInPmap(r)) |
193 |
< |
return(1); |
193 |
> |
return(1); */ |
194 |
> |
|
195 |
|
/* easy shadow test */ |
196 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
197 |
|
return(1); |
211 |
|
nd.mp = m; |
212 |
|
nd.rp = r; |
213 |
|
/* get material color */ |
214 |
< |
setcolor(nd.mcolor, m->oargs.farg[0], |
214 |
> |
setscolor(nd.mcolor, m->oargs.farg[0], |
215 |
|
m->oargs.farg[1], |
216 |
|
m->oargs.farg[2]); |
217 |
|
/* get roughness */ |
230 |
|
nd.specfl |= SP_FLAT; |
231 |
|
if (nd.pdot < .001) |
232 |
|
nd.pdot = .001; /* non-zero for dirnorm() */ |
233 |
< |
multcolor(nd.mcolor, r->pcol); /* modify material color */ |
234 |
< |
mirtest = transtest = 0; |
235 |
< |
mirdist = transdist = r->rot; |
233 |
> |
smultscolor(nd.mcolor, r->pcol); /* modify material color */ |
234 |
|
nd.rspec = m->oargs.farg[3]; |
235 |
|
/* compute Fresnel approx. */ |
236 |
|
if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
251 |
|
nd.specfl |= SP_TBLT; |
252 |
|
if (!hastexture || r->crtype & (SHADOW|AMBIENT)) { |
253 |
|
VCOPY(nd.prdir, r->rdir); |
256 |
– |
transtest = 2; |
254 |
|
} else { |
255 |
< |
for (i = 0; i < 3; i++) /* perturb */ |
256 |
< |
nd.prdir[i] = r->rdir[i] - r->pert[i]; |
255 |
> |
/* perturb */ |
256 |
> |
VSUB(nd.prdir, r->rdir, r->pert); |
257 |
|
if (DOT(nd.prdir, r->ron) < -FTINY) |
258 |
|
normalize(nd.prdir); /* OK */ |
259 |
|
else |
262 |
|
} |
263 |
|
} else |
264 |
|
nd.tdiff = nd.tspec = nd.trans = 0.0; |
265 |
+ |
/* diffuse reflection */ |
266 |
+ |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
267 |
|
/* transmitted ray */ |
269 |
– |
|
268 |
|
if ((nd.specfl&(SP_TRAN|SP_PURE|SP_TBLT)) == (SP_TRAN|SP_PURE)) { |
269 |
|
RAY lr; |
270 |
< |
copycolor(lr.rcoef, nd.mcolor); /* modified by color */ |
271 |
< |
scalecolor(lr.rcoef, nd.tspec); |
270 |
> |
copyscolor(lr.rcoef, nd.mcolor); /* modified by color */ |
271 |
> |
scalescolor(lr.rcoef, nd.tspec); |
272 |
|
if (rayorigin(&lr, TRANS, r, lr.rcoef) == 0) { |
273 |
|
VCOPY(lr.rdir, nd.prdir); |
274 |
|
rayvalue(&lr); |
275 |
< |
multcolor(lr.rcol, lr.rcoef); |
276 |
< |
addcolor(r->rcol, lr.rcol); |
277 |
< |
transtest *= bright(lr.rcol); |
278 |
< |
transdist = r->rot + lr.rt; |
275 |
> |
smultscolor(lr.rcol, lr.rcoef); |
276 |
> |
saddscolor(r->rcol, lr.rcol); |
277 |
> |
if (nd.tspec >= 1.0-FTINY) { |
278 |
> |
/* completely transparent */ |
279 |
> |
smultscolor(lr.mcol, lr.rcoef); |
280 |
> |
copyscolor(r->mcol, lr.mcol); |
281 |
> |
r->rmt = r->rot + lr.rmt; |
282 |
> |
r->rxt = r->rot + lr.rxt; |
283 |
> |
} else if (nd.tspec > nd.tdiff + nd.rdiff) |
284 |
> |
r->rxt = r->rot + raydistance(&lr); |
285 |
|
} |
286 |
< |
} else |
283 |
< |
transtest = 0; |
286 |
> |
} |
287 |
|
|
288 |
< |
if (r->crtype & SHADOW) { /* the rest is shadow */ |
286 |
< |
r->rt = transdist; |
288 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
289 |
|
return(1); |
288 |
– |
} |
290 |
|
/* get specular reflection */ |
291 |
|
if (nd.rspec > FTINY) { |
292 |
|
nd.specfl |= SP_REFL; |
293 |
|
/* compute specular color */ |
294 |
|
if (m->otype != MAT_METAL) { |
295 |
< |
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
295 |
> |
setscolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
296 |
|
} else if (fest > FTINY) { |
297 |
|
d = m->oargs.farg[3]*(1. - fest); |
298 |
< |
for (i = 0; i < 3; i++) |
299 |
< |
colval(nd.scolor,i) = fest + |
299 |
< |
colval(nd.mcolor,i)*d; |
298 |
> |
for (i = NCSAMP; i--; ) |
299 |
> |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
300 |
|
} else { |
301 |
< |
copycolor(nd.scolor, nd.mcolor); |
302 |
< |
scalecolor(nd.scolor, nd.rspec); |
301 |
> |
copyscolor(nd.scolor, nd.mcolor); |
302 |
> |
scalescolor(nd.scolor, nd.rspec); |
303 |
|
} |
304 |
|
/* check threshold */ |
305 |
|
if (!(nd.specfl & SP_PURE) && specthresh >= nd.rspec-FTINY) |
317 |
|
if (rayorigin(&lr, REFLECTED, r, nd.scolor) == 0) { |
318 |
|
VCOPY(lr.rdir, nd.vrefl); |
319 |
|
rayvalue(&lr); |
320 |
< |
multcolor(lr.rcol, lr.rcoef); |
321 |
< |
addcolor(r->rcol, lr.rcol); |
320 |
> |
smultscolor(lr.rcol, lr.rcoef); |
321 |
> |
copyscolor(r->mcol, lr.rcol); |
322 |
> |
saddscolor(r->rcol, lr.rcol); |
323 |
> |
r->rmt = r->rot; |
324 |
|
if (nd.specfl & SP_FLAT && |
325 |
< |
!hastexture | (r->crtype & AMBIENT)) { |
326 |
< |
mirtest = 2.*bright(lr.rcol); |
325 |
< |
mirdist = r->rot + lr.rt; |
326 |
< |
} |
325 |
> |
!hastexture | (r->crtype & AMBIENT)) |
326 |
> |
r->rmt += raydistance(&lr); |
327 |
|
} |
328 |
|
} |
329 |
– |
/* diffuse reflection */ |
330 |
– |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
329 |
|
|
330 |
|
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
331 |
|
return(1); /* 100% pure specular */ |
334 |
|
gaussamp(&nd); /* checks *BLT flags */ |
335 |
|
|
336 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
337 |
< |
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
338 |
< |
scalecolor(ctmp, nd.rdiff); |
337 |
> |
copyscolor(sctmp, nd.mcolor); /* modified by material color */ |
338 |
> |
scalescolor(sctmp, nd.rdiff); |
339 |
|
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
340 |
< |
addcolor(ctmp, nd.scolor); |
341 |
< |
multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
342 |
< |
addcolor(r->rcol, ctmp); /* add to returned color */ |
340 |
> |
saddscolor(sctmp, nd.scolor); |
341 |
> |
multambient(sctmp, r, nd.pnorm); |
342 |
> |
saddscolor(r->rcol, sctmp); /* add to returned color */ |
343 |
|
} |
344 |
|
if (nd.tdiff > FTINY) { /* ambient from other side */ |
345 |
< |
copycolor(ctmp, nd.mcolor); /* modified by color */ |
346 |
< |
if (nd.specfl & SP_TBLT) |
347 |
< |
scalecolor(ctmp, nd.trans); |
348 |
< |
else |
349 |
< |
scalecolor(ctmp, nd.tdiff); |
350 |
< |
flipsurface(r); |
351 |
< |
if (hastexture) { |
352 |
< |
FVECT bnorm; |
353 |
< |
bnorm[0] = -nd.pnorm[0]; |
354 |
< |
bnorm[1] = -nd.pnorm[1]; |
355 |
< |
bnorm[2] = -nd.pnorm[2]; |
356 |
< |
multambient(ctmp, r, bnorm); |
359 |
< |
} else |
360 |
< |
multambient(ctmp, r, r->ron); |
361 |
< |
addcolor(r->rcol, ctmp); |
362 |
< |
flipsurface(r); |
345 |
> |
FVECT bnorm; |
346 |
> |
copyscolor(sctmp, nd.mcolor); /* modified by color */ |
347 |
> |
if (nd.specfl & SP_TBLT) { |
348 |
> |
scalescolor(sctmp, nd.trans); |
349 |
> |
} else { |
350 |
> |
scalescolor(sctmp, nd.tdiff); |
351 |
> |
} |
352 |
> |
bnorm[0] = -nd.pnorm[0]; |
353 |
> |
bnorm[1] = -nd.pnorm[1]; |
354 |
> |
bnorm[2] = -nd.pnorm[2]; |
355 |
> |
multambient(sctmp, r, bnorm); |
356 |
> |
saddscolor(r->rcol, sctmp); |
357 |
|
} |
358 |
|
/* add direct component */ |
359 |
|
direct(r, dirnorm, &nd); |
366 |
– |
/* check distance */ |
367 |
– |
d = bright(r->rcol); |
368 |
– |
if (transtest > d) |
369 |
– |
r->rt = transdist; |
370 |
– |
else if (mirtest > d) |
371 |
– |
r->rt = mirdist; |
360 |
|
|
361 |
|
return(1); |
362 |
|
} |
371 |
|
FVECT u, v, h; |
372 |
|
double rv[2]; |
373 |
|
double d, sinp, cosp; |
374 |
< |
COLOR scol; |
374 |
> |
SCOLOR scol; |
375 |
|
int maxiter, ntrials, nstarget, nstaken; |
376 |
|
int i; |
377 |
|
/* quick test */ |
383 |
|
fcross(v, np->pnorm, u); |
384 |
|
/* compute reflection */ |
385 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
386 |
< |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
386 |
> |
rayorigin(&sr, RSPECULAR, np->rp, np->scolor) == 0) { |
387 |
|
nstarget = 1; |
388 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
389 |
|
nstarget = specjitter*np->rp->rweight + .5; |
391 |
|
nstarget = sr.rweight/minweight; |
392 |
|
if (nstarget > 1) { |
393 |
|
d = 1./nstarget; |
394 |
< |
scalecolor(sr.rcoef, d); |
394 |
> |
scalescolor(sr.rcoef, d); |
395 |
|
sr.rweight *= d; |
396 |
|
} else |
397 |
|
nstarget = 1; |
398 |
|
} |
399 |
< |
setcolor(scol, 0., 0., 0.); |
399 |
> |
scolorblack(scol); |
400 |
|
dimlist[ndims++] = (int)(size_t)np->mp; |
401 |
|
maxiter = MAXITER*nstarget; |
402 |
|
for (nstaken = ntrials = 0; nstaken < nstarget && |
427 |
|
if (nstaken) rayclear(&sr); |
428 |
|
rayvalue(&sr); |
429 |
|
d = 2./(1. + np->rp->rod/d); |
430 |
< |
scalecolor(sr.rcol, d); |
431 |
< |
addcolor(scol, sr.rcol); |
430 |
> |
scalescolor(sr.rcol, d); |
431 |
> |
saddscolor(scol, sr.rcol); |
432 |
|
} else { |
433 |
|
rayvalue(&sr); |
434 |
< |
multcolor(sr.rcol, sr.rcoef); |
435 |
< |
addcolor(np->rp->rcol, sr.rcol); |
434 |
> |
smultscolor(sr.rcol, sr.rcoef); |
435 |
> |
saddscolor(np->rp->rcol, sr.rcol); |
436 |
|
} |
437 |
|
++nstaken; |
438 |
|
} |
439 |
|
if (nstarget > 1) { /* final W-G-M-D weighting */ |
440 |
< |
multcolor(scol, sr.rcoef); |
440 |
> |
smultscolor(scol, sr.rcoef); |
441 |
|
d = (double)nstarget/ntrials; |
442 |
< |
scalecolor(scol, d); |
443 |
< |
addcolor(np->rp->rcol, scol); |
442 |
> |
scalescolor(scol, d); |
443 |
> |
saddscolor(np->rp->rcol, scol); |
444 |
|
} |
445 |
|
ndims--; |
446 |
|
} |
447 |
|
/* compute transmission */ |
448 |
< |
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
449 |
< |
scalecolor(sr.rcoef, np->tspec); |
448 |
> |
copyscolor(sr.rcoef, np->mcolor); /* modified by color */ |
449 |
> |
scalescolor(sr.rcoef, np->tspec); |
450 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
451 |
< |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
451 |
> |
rayorigin(&sr, TSPECULAR, np->rp, sr.rcoef) == 0) { |
452 |
|
nstarget = 1; |
453 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
454 |
|
nstarget = specjitter*np->rp->rweight + .5; |
456 |
|
nstarget = sr.rweight/minweight; |
457 |
|
if (nstarget > 1) { |
458 |
|
d = 1./nstarget; |
459 |
< |
scalecolor(sr.rcoef, d); |
459 |
> |
scalescolor(sr.rcoef, d); |
460 |
|
sr.rweight *= d; |
461 |
|
} else |
462 |
|
nstarget = 1; |
488 |
|
if (nstaken) /* multi-sampling */ |
489 |
|
rayclear(&sr); |
490 |
|
rayvalue(&sr); |
491 |
< |
multcolor(sr.rcol, sr.rcoef); |
492 |
< |
addcolor(np->rp->rcol, sr.rcol); |
491 |
> |
smultscolor(sr.rcol, sr.rcoef); |
492 |
> |
saddscolor(np->rp->rcol, sr.rcol); |
493 |
|
++nstaken; |
494 |
|
} |
495 |
|
ndims--; |