| 17 |
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#include "pmapmat.h" |
| 18 |
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|
| 19 |
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/* |
| 20 |
< |
* Arguments to this material include optional diffuse colors. |
| 20 |
> |
* Arguments to this material include optional diffuse colors. |
| 21 |
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* String arguments include the BSDF and function files. |
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* For the MAT_BSDF type, a non-zero thickness causes the useful behavior |
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* of translating transmitted rays this distance beneath the surface |
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{1.8, -1.8}, {-2.4, 0}, {0, 2.4}, |
| 131 |
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{0, -2.4}, {2.4, 0}, |
| 132 |
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}; |
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– |
#define neighbors(i,j) \ |
| 134 |
– |
((dir2check[i][0]-dir2check[j][0])*(dir2check[i][0]-dir2check[j][0]) + \ |
| 135 |
– |
(dir2check[i][1]-dir2check[j][1])*(dir2check[i][1]-dir2check[j][1]) <= 0.73) |
| 136 |
– |
const double peak_over = 1.5; |
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PEAKSAMP psamp[NDIR2CHECK]; |
| 134 |
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SDSpectralDF *dfp; |
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FVECT pdir; |
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double tomega, srchrad; |
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double tomsum, tomsurr; |
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< |
COLOR vpeak, vsurr; |
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> |
COLOR vpeak, vsurr, btdiff; |
| 139 |
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double vypeak; |
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< |
int i, j, ns; |
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> |
int i, ns; |
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SDError ec; |
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|
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if (ndp->pr->rod > 0) |
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psamp[i].tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; |
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psamp[i].tdir[2] = -ndp->vray[2]; |
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normalize(psamp[i].tdir); |
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< |
ec = SDevalBSDF(&sv, psamp[i].tdir, ndp->vray, ndp->sd); |
| 159 |
> |
ec = SDevalBSDF(&sv, ndp->vray, psamp[i].tdir, ndp->sd); |
| 160 |
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if (ec) |
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goto baderror; |
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cvt_sdcolor(psamp[i].vcol, &sv); |
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} |
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qsort(psamp, NDIR2CHECK, sizeof(PEAKSAMP), cmp_psamp); |
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if (psamp[0].vy <= FTINY) |
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< |
return; /* zero area */ |
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> |
return; /* zero BTDF here */ |
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setcolor(vpeak, 0, 0, 0); |
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setcolor(vsurr, 0, 0, 0); |
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vypeak = tomsum = tomsurr = 0; /* combine top unique values */ |
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ns = 0; |
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for (i = 0; i < NDIR2CHECK; i++) { |
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< |
for (j = i; j--; ) /* check for duplicate sample */ |
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< |
if (psamp[j].vy == psamp[i].vy && neighbors(i,j)) |
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< |
break; |
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< |
if (j >= 0) |
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< |
continue; /* skip duplicate */ |
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> |
if (i && psamp[i].vy == psamp[i-1].vy) |
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> |
continue; /* assume duplicate sample */ |
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|
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< |
ec = SDsizeBSDF(&tomega, psamp[i].tdir, ndp->vray, |
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> |
ec = SDsizeBSDF(&tomega, ndp->vray, psamp[i].tdir, |
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SDqueryMin, ndp->sd); |
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if (ec) |
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goto baderror; |
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< |
/* not really a peak? */ |
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> |
|
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> |
scalecolor(psamp[i].vcol, tomega); |
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> |
/* not part of peak? */ |
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if (tomega > 1.5*dfp->minProjSA || |
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vypeak > 8.*psamp[i].vy*ns) { |
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if (!i) return; /* abort */ |
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scalecolor(psamp[i].vcol, tomega); |
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addcolor(vsurr, psamp[i].vcol); |
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tomsurr += tomega; |
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continue; |
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} |
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scalecolor(psamp[i].vcol, tomega); |
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addcolor(vpeak, psamp[i].vcol); |
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tomsum += tomega; |
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vypeak += psamp[i].vy; |
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++ns; |
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} |
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< |
if (vypeak*tomsurr < peak_over*bright(vsurr)*ns) |
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< |
return; /* peak not peaky enough */ |
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< |
if ((vypeak/ns - (ndp->vray[2] > 0 ? ndp->sd->tLambFront.cieY |
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< |
: ndp->sd->tLambBack.cieY)*(1./PI))*tomsum <= .001) |
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< |
return; /* < 0.1% transmission */ |
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< |
copycolor(ndp->cthru, vpeak); /* already scaled by omega */ |
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< |
multcolor(ndp->cthru, ndp->pr->pcol); /* modify by pattern */ |
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< |
if (tomsurr > FTINY) { /* surround contribution? */ |
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< |
scalecolor(vsurr, 1./tomsurr); /* this one is avg. BTDF */ |
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< |
copycolor(ndp->cthru_surr, vsurr); |
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< |
multcolor(ndp->cthru_surr, ndp->pr->pcol); |
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> |
if (tomsurr < 0.2*tomsum) /* insufficient surround? */ |
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> |
return; |
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> |
scalecolor(vsurr, 1./tomsurr); /* surround is avg. BTDF */ |
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> |
if (ndp->vray[2] > 0) /* get diffuse BTDF */ |
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> |
cvt_sdcolor(btdiff, &ndp->sd->tLambFront); |
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> |
else |
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> |
cvt_sdcolor(btdiff, &ndp->sd->tLambBack); |
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> |
scalecolor(btdiff, (1./PI)); |
| 203 |
> |
for (i = 3; i--; ) { /* remove diffuse contrib. */ |
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> |
if ((colval(vpeak,i) -= tomsum*colval(btdiff,i)) < 0) |
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> |
colval(vpeak,i) = 0; |
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> |
if ((colval(vsurr,i) -= colval(btdiff,i)) < 0) |
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> |
colval(vsurr,i) = 0; |
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} |
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+ |
if (bright(vpeak) < .0005) /* < 0.05% specular? */ |
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+ |
return; |
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+ |
multcolor(vsurr, ndp->pr->pcol); /* modify by color */ |
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+ |
multcolor(vpeak, ndp->pr->pcol); |
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+ |
copycolor(ndp->cthru, vpeak); |
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+ |
copycolor(ndp->cthru_surr, vsurr); |
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return; |
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baderror: |
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objerror(ndp->mp, USER, transSDError(ec)); |
| 217 |
– |
#undef neighbors |
| 218 |
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#undef NDIR2CHECK |
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} |
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|
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static int |
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direct_specular_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
| 238 |
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{ |
| 239 |
< |
int nsamp; |
| 240 |
< |
double wtot = 0; |
| 241 |
< |
FVECT vsrc, vsmp, vjit; |
| 239 |
> |
int nsamp = 1; |
| 240 |
> |
int scnt = 0; |
| 241 |
> |
FVECT vsrc, vjit; |
| 242 |
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double tomega, tomega2; |
| 243 |
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double sf, tsr, sd[2]; |
| 244 |
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COLOR csmp, cdiff; |
| 281 |
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diffY = 0; |
| 282 |
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setcolor(cdiff, 0, 0, 0); |
| 283 |
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} |
| 284 |
– |
/* need projected solid angle */ |
| 285 |
– |
omega *= fabs(vsrc[2]); |
| 284 |
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/* check indirect over-counting */ |
| 285 |
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if ((vsrc[2] > 0) ^ (ndp->vray[2] > 0) && bright(ndp->cthru) > FTINY) { |
| 286 |
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double dx = vsrc[0] + ndp->vray[0]; |
| 289 |
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((ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb) : |
| 290 |
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((ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf) ; |
| 291 |
|
|
| 292 |
< |
if (dx*dx + dy*dy <= (2.5*4./PI)*(omega + dfp->minProjSA + |
| 293 |
< |
2.*sqrt(omega*dfp->minProjSA))) { |
| 292 |
> |
tomega = omega*fabs(vsrc[2]); |
| 293 |
> |
if (dx*dx + dy*dy <= (2.5*4./PI)*(tomega + dfp->minProjSA + |
| 294 |
> |
2.*sqrt(tomega*dfp->minProjSA))) { |
| 295 |
|
if (bright(ndp->cthru_surr) <= FTINY) |
| 296 |
|
return(0); |
| 297 |
|
copycolor(cval, ndp->cthru_surr); |
| 301 |
|
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
| 302 |
|
if (ec) |
| 303 |
|
goto baderror; |
| 304 |
< |
/* assign number of samples */ |
| 305 |
< |
sf = specjitter * ndp->pr->rweight; |
| 306 |
< |
if (tomega <= 0) |
| 307 |
< |
nsamp = 1; |
| 308 |
< |
else if (25.*tomega <= omega) |
| 309 |
< |
nsamp = 100.*sf + .5; |
| 311 |
< |
else |
| 312 |
< |
nsamp = 4.*sf*omega/tomega + .5; |
| 313 |
< |
nsamp += !nsamp; |
| 314 |
< |
sf = sqrt(omega); /* sample our source area */ |
| 315 |
< |
tsr = sqrt(tomega); |
| 304 |
> |
/* check if sampling BSDF */ |
| 305 |
> |
if ((tsr = sqrt(tomega)) > 0) { |
| 306 |
> |
nsamp = 4.*specjitter*ndp->pr->rweight + .5; |
| 307 |
> |
nsamp += !nsamp; |
| 308 |
> |
} |
| 309 |
> |
/* jitter to fuzz BSDF cells */ |
| 310 |
|
for (i = nsamp; i--; ) { |
| 317 |
– |
VCOPY(vsmp, vsrc); /* jitter query directions */ |
| 318 |
– |
if (nsamp > 1) { |
| 319 |
– |
multisamp(sd, 2, (i + frandom())/(double)nsamp); |
| 320 |
– |
vsmp[0] += (sd[0] - .5)*sf; |
| 321 |
– |
vsmp[1] += (sd[1] - .5)*sf; |
| 322 |
– |
normalize(vsmp); |
| 323 |
– |
} |
| 311 |
|
bsdf_jitter(vjit, ndp, tsr); |
| 312 |
|
/* compute BSDF */ |
| 313 |
< |
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
| 313 |
> |
ec = SDevalBSDF(&sv, vjit, vsrc, ndp->sd); |
| 314 |
|
if (ec) |
| 315 |
|
goto baderror; |
| 316 |
|
if (sv.cieY - diffY <= FTINY) |
| 317 |
|
continue; /* no specular part */ |
| 318 |
|
/* check for variable resolution */ |
| 319 |
< |
ec = SDsizeBSDF(&tomega2, vjit, vsmp, SDqueryMin, ndp->sd); |
| 319 |
> |
ec = SDsizeBSDF(&tomega2, vjit, vsrc, SDqueryMin, ndp->sd); |
| 320 |
|
if (ec) |
| 321 |
|
goto baderror; |
| 322 |
|
if (tomega2 < .12*tomega) |
| 323 |
|
continue; /* not safe to include */ |
| 324 |
|
cvt_sdcolor(csmp, &sv); |
| 338 |
– |
#if 0 |
| 339 |
– |
if (sf < 2.5*tsr) { /* weight by BSDF for small sources */ |
| 340 |
– |
scalecolor(csmp, sv.cieY); |
| 341 |
– |
wtot += sv.cieY; |
| 342 |
– |
} else |
| 343 |
– |
#endif |
| 344 |
– |
wtot += 1.; |
| 325 |
|
addcolor(cval, csmp); |
| 326 |
+ |
++scnt; |
| 327 |
|
} |
| 328 |
< |
if (wtot <= FTINY) /* no valid specular samples? */ |
| 328 |
> |
if (!scnt) /* no valid specular samples? */ |
| 329 |
|
return(0); |
| 330 |
|
|
| 331 |
< |
sf = 1./wtot; /* weighted average BSDF */ |
| 331 |
> |
sf = 1./scnt; /* weighted average BSDF */ |
| 332 |
|
scalecolor(cval, sf); |
| 333 |
|
/* subtract diffuse contribution */ |
| 334 |
|
for (i = 3*(diffY > FTINY); i--; ) |
| 374 |
|
* Compute diffuse transmission |
| 375 |
|
*/ |
| 376 |
|
copycolor(ctmp, np->tdiff); |
| 377 |
< |
dtmp = -ldot * omega * (1.0/PI); |
| 377 |
> |
dtmp = -ldot * omega * (1./PI); |
| 378 |
|
scalecolor(ctmp, dtmp); |
| 379 |
|
addcolor(cval, ctmp); |
| 380 |
|
} |
| 462 |
|
* Compute diffuse transmission |
| 463 |
|
*/ |
| 464 |
|
copycolor(ctmp, np->tdiff); |
| 465 |
< |
dtmp = -ldot * omega * (1.0/PI); |
| 465 |
> |
dtmp = -ldot * omega * (1./PI); |
| 466 |
|
scalecolor(ctmp, dtmp); |
| 467 |
|
addcolor(cval, ctmp); |
| 468 |
|
} |
