| 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 */ |
| 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 */ |
| 236 |
< |
mirtest = transtest = 0; |
| 237 |
< |
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); |
| 258 |
– |
transtest = 2; |
| 254 |
|
} else { |
| 255 |
|
/* perturb */ |
| 256 |
|
VSUB(nd.prdir, r->rdir, r->pert); |
| 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 */ |
| 271 |
– |
|
| 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 |
| 285 |
< |
transtest = 0; |
| 286 |
> |
} |
| 287 |
|
|
| 288 |
< |
if (r->crtype & SHADOW) { /* the rest is shadow */ |
| 288 |
< |
r->rt = transdist; |
| 288 |
> |
if (r->crtype & SHADOW) /* the rest is shadow */ |
| 289 |
|
return(1); |
| 290 |
– |
} |
| 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 + |
| 301 |
< |
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); |
| 327 |
< |
mirdist = r->rot + lr.rt; |
| 328 |
< |
} |
| 325 |
> |
!hastexture | (r->crtype & AMBIENT)) |
| 326 |
> |
r->rmt += raydistance(&lr); |
| 327 |
|
} |
| 328 |
|
} |
| 331 |
– |
/* diffuse reflection */ |
| 332 |
– |
nd.rdiff = 1.0 - nd.trans - nd.rspec; |
| 329 |
|
|
| 330 |
< |
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) { |
| 335 |
< |
if (mirtest > transtest+FTINY) |
| 336 |
< |
r->rt = mirdist; |
| 337 |
< |
else if (transtest > FTINY) |
| 338 |
< |
r->rt = transdist; |
| 330 |
> |
if (nd.specfl & SP_PURE && nd.rdiff <= FTINY && nd.tdiff <= FTINY) |
| 331 |
|
return(1); /* 100% pure specular */ |
| 332 |
< |
} |
| 332 |
> |
|
| 333 |
|
if (!(nd.specfl & SP_PURE)) |
| 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); |
| 365 |
< |
} else |
| 366 |
< |
multambient(ctmp, r, r->ron); |
| 367 |
< |
addcolor(r->rcol, ctmp); |
| 368 |
< |
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); |
| 372 |
– |
/* check distance */ |
| 373 |
– |
d = bright(r->rcol); |
| 374 |
– |
if (transtest > d) |
| 375 |
– |
r->rt = transdist; |
| 376 |
– |
else if (mirtest > d) |
| 377 |
– |
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--; |
