50 |
|
* Arguments for MAT_BSDF are: |
51 |
|
* 6+ thick BSDFfile ux uy uz funcfile transform |
52 |
|
* 0 |
53 |
< |
* 0|3|9 rdf gdf bdf |
53 |
> |
* 0|3|6|9 rdf gdf bdf |
54 |
|
* rdb gdb bdb |
55 |
|
* rdt gdt bdt |
56 |
|
*/ |
67 |
|
RAY *pr; /* intersected ray */ |
68 |
|
FVECT pnorm; /* perturbed surface normal */ |
69 |
|
FVECT vray; /* local outgoing (return) vector */ |
70 |
< |
double sr_vpsa; /* sqrt of BSDF projected solid angle */ |
70 |
> |
double sr_vpsa[2]; /* sqrt of BSDF projected solid angle extrema */ |
71 |
|
RREAL toloc[3][3]; /* world to local BSDF coords */ |
72 |
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
73 |
|
double thick; /* surface thickness */ |
82 |
|
|
83 |
|
/* Jitter ray sample according to projected solid angle and specjitter */ |
84 |
|
static void |
85 |
< |
bsdf_jitter(FVECT vres, BSDFDAT *ndp) |
85 |
> |
bsdf_jitter(FVECT vres, BSDFDAT *ndp, double sr_psa) |
86 |
|
{ |
87 |
– |
double sr_psa = ndp->sr_vpsa; |
88 |
– |
|
87 |
|
VCOPY(vres, ndp->vray); |
88 |
|
if (specjitter < 1.) |
89 |
|
sr_psa *= specjitter; |
96 |
|
|
97 |
|
/* Evaluate BSDF for direct component, returning true if OK to proceed */ |
98 |
|
static int |
99 |
< |
direct_bsdf_OK(COLOR cval, FVECT ldir, BSDFDAT *ndp) |
99 |
> |
direct_bsdf_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
100 |
|
{ |
101 |
< |
FVECT vsrc, vjit; |
101 |
> |
int nsamp, ok = 0; |
102 |
> |
FVECT vsrc, vsmp, vjit; |
103 |
> |
double tomega; |
104 |
> |
double sf, tsr, sd[2]; |
105 |
> |
COLOR csmp; |
106 |
|
SDValue sv; |
107 |
|
SDError ec; |
108 |
+ |
int i; |
109 |
|
/* transform source direction */ |
110 |
|
if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) |
111 |
|
return(0); |
112 |
< |
/* jitter query direction */ |
113 |
< |
bsdf_jitter(vjit, ndp); |
114 |
< |
/* avoid indirect over-counting */ |
115 |
< |
if (ndp->thick != .0 && ndp->pr->crtype & (SPECULAR|AMBIENT) && |
116 |
< |
vsrc[2] > .0 ^ vjit[2] > .0) { |
117 |
< |
double dx = vsrc[0] + vjit[0]; |
118 |
< |
double dy = vsrc[1] + vjit[1]; |
119 |
< |
if (dx*dx + dy*dy <= ndp->sr_vpsa*ndp->sr_vpsa) |
112 |
> |
/* assign number of samples */ |
113 |
> |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
114 |
> |
if (ec) |
115 |
> |
goto baderror; |
116 |
> |
/* check indirect over-counting */ |
117 |
> |
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) |
118 |
> |
&& vsrc[2] > 0 ^ ndp->vray[2] > 0) { |
119 |
> |
double dx = vsrc[0] + ndp->vray[0]; |
120 |
> |
double dy = vsrc[1] + ndp->vray[1]; |
121 |
> |
if (dx*dx + dy*dy <= omega+tomega) |
122 |
|
return(0); |
123 |
|
} |
124 |
< |
ec = SDevalBSDF(&sv, vjit, vsrc, ndp->sd); |
125 |
< |
if (ec) |
126 |
< |
objerror(ndp->mp, USER, transSDError(ec)); |
127 |
< |
|
128 |
< |
if (sv.cieY <= FTINY) /* not worth using? */ |
129 |
< |
return(0); |
130 |
< |
/* else we're good to go */ |
131 |
< |
cvt_sdcolor(cval, &sv); |
132 |
< |
return(1); |
124 |
> |
sf = specjitter * ndp->pr->rweight; |
125 |
> |
if (tomega <= .0) |
126 |
> |
nsamp = 1; |
127 |
> |
else if (25.*tomega <= omega) |
128 |
> |
nsamp = 100.*sf + .5; |
129 |
> |
else |
130 |
> |
nsamp = 4.*sf*omega/tomega + .5; |
131 |
> |
nsamp += !nsamp; |
132 |
> |
setcolor(cval, .0, .0, .0); /* sample our source area */ |
133 |
> |
sf = sqrt(omega); |
134 |
> |
tsr = sqrt(tomega); |
135 |
> |
for (i = nsamp; i--; ) { |
136 |
> |
VCOPY(vsmp, vsrc); /* jitter query directions */ |
137 |
> |
if (nsamp > 1) { |
138 |
> |
multisamp(sd, 2, (i + frandom())/(double)nsamp); |
139 |
> |
vsmp[0] += (sd[0] - .5)*sf; |
140 |
> |
vsmp[1] += (sd[1] - .5)*sf; |
141 |
> |
if (normalize(vsmp) == 0) { |
142 |
> |
--nsamp; |
143 |
> |
continue; |
144 |
> |
} |
145 |
> |
} |
146 |
> |
bsdf_jitter(vjit, ndp, tsr); |
147 |
> |
/* compute BSDF */ |
148 |
> |
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
149 |
> |
if (ec) |
150 |
> |
goto baderror; |
151 |
> |
if (sv.cieY <= FTINY) /* worth using? */ |
152 |
> |
continue; |
153 |
> |
cvt_sdcolor(csmp, &sv); |
154 |
> |
addcolor(cval, csmp); /* average it in */ |
155 |
> |
++ok; |
156 |
> |
} |
157 |
> |
sf = 1./(double)nsamp; |
158 |
> |
scalecolor(cval, sf); |
159 |
> |
return(ok); |
160 |
> |
baderror: |
161 |
> |
objerror(ndp->mp, USER, transSDError(ec)); |
162 |
> |
return(0); /* gratis return */ |
163 |
|
} |
164 |
|
|
165 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
182 |
|
if ((-FTINY <= ldot) & (ldot <= FTINY)) |
183 |
|
return; |
184 |
|
|
185 |
< |
if (ldot > .0 && bright(np->rdiff) > FTINY) { |
185 |
> |
if (ldot > 0 && bright(np->rdiff) > FTINY) { |
186 |
|
/* |
187 |
|
* Compute added diffuse reflected component. |
188 |
|
*/ |
191 |
|
scalecolor(ctmp, dtmp); |
192 |
|
addcolor(cval, ctmp); |
193 |
|
} |
194 |
< |
if (ldot < .0 && bright(np->tdiff) > FTINY) { |
194 |
> |
if (ldot < 0 && bright(np->tdiff) > FTINY) { |
195 |
|
/* |
196 |
|
* Compute added diffuse transmission. |
197 |
|
*/ |
203 |
|
/* |
204 |
|
* Compute scattering coefficient using BSDF. |
205 |
|
*/ |
206 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
206 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
207 |
|
return; |
208 |
< |
if (ldot > .0) { /* pattern only diffuse reflection */ |
208 |
> |
if (ldot > 0) { /* pattern only diffuse reflection */ |
209 |
|
COLOR ctmp1, ctmp2; |
210 |
< |
dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
210 |
> |
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
211 |
|
: np->sd->rLambBack.cieY; |
212 |
|
/* diffuse fraction */ |
213 |
|
dtmp /= PI * bright(ctmp); |
258 |
|
/* |
259 |
|
* Compute reflection coefficient using BSDF. |
260 |
|
*/ |
261 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
261 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
262 |
|
return; |
263 |
|
/* pattern only diffuse reflection */ |
264 |
< |
dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
264 |
> |
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
265 |
|
: np->sd->rLambBack.cieY; |
266 |
|
dtmp /= PI * bright(ctmp); /* diffuse fraction */ |
267 |
|
copycolor(ctmp2, np->pr->pcol); |
307 |
|
/* |
308 |
|
* Compute scattering coefficient using BSDF. |
309 |
|
*/ |
310 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
310 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
311 |
|
return; |
312 |
|
/* full pattern on transmission */ |
313 |
|
multcolor(ctmp, np->pr->pcol); |
321 |
|
sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat) |
322 |
|
{ |
323 |
|
int nstarget = 1; |
324 |
< |
int nsent = 0; |
324 |
> |
int nsent; |
325 |
|
SDError ec; |
326 |
|
SDValue bsv; |
327 |
< |
double sthick; |
328 |
< |
FVECT vjit, vsmp; |
327 |
> |
double xrand; |
328 |
> |
FVECT vsmp; |
329 |
|
RAY sr; |
295 |
– |
int ntrials; |
330 |
|
/* multiple samples? */ |
331 |
|
if (specjitter > 1.5) { |
332 |
|
nstarget = specjitter*ndp->pr->rweight + .5; |
333 |
< |
if (nstarget < 1) |
300 |
< |
nstarget = 1; |
333 |
> |
nstarget += !nstarget; |
334 |
|
} |
335 |
< |
/* run through our trials */ |
336 |
< |
for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
337 |
< |
SDerrorDetail[0] = '\0'; |
338 |
< |
/* sample direction & coef. */ |
339 |
< |
bsdf_jitter(vjit, ndp); |
340 |
< |
ec = SDsampComponent(&bsv, vsmp, vjit, ntrials ? frandom() |
341 |
< |
: urand(ilhash(dimlist,ndims)+samplendx), dcp); |
335 |
> |
/* run through our samples */ |
336 |
> |
for (nsent = 0; nsent < nstarget; nsent++) { |
337 |
> |
if (nstarget == 1) { /* stratify random variable */ |
338 |
> |
xrand = urand(ilhash(dimlist,ndims)+samplendx); |
339 |
> |
if (specjitter < 1.) |
340 |
> |
xrand = .5 + specjitter*(xrand-.5); |
341 |
> |
} else { |
342 |
> |
xrand = (nsent + frandom())/(double)nstarget; |
343 |
> |
} |
344 |
> |
SDerrorDetail[0] = '\0'; /* sample direction & coef. */ |
345 |
> |
bsdf_jitter(vsmp, ndp, ndp->sr_vpsa[0]); |
346 |
> |
ec = SDsampComponent(&bsv, vsmp, xrand, dcp); |
347 |
|
if (ec) |
348 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
349 |
< |
/* zero component? */ |
312 |
< |
if (bsv.cieY <= FTINY) |
349 |
> |
if (bsv.cieY <= FTINY) /* zero component? */ |
350 |
|
break; |
351 |
|
/* map vector to world */ |
352 |
|
if (SDmapDir(sr.rdir, ndp->fromloc, vsmp) != SDEnone) |
353 |
|
break; |
317 |
– |
/* unintentional penetration? */ |
318 |
– |
if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vsmp[2] > .0) |
319 |
– |
continue; |
354 |
|
/* spawn a specular ray */ |
355 |
|
if (nstarget > 1) |
356 |
|
bsv.cieY /= (double)nstarget; |
357 |
< |
cvt_sdcolor(sr.rcoef, &bsv); /* use color */ |
358 |
< |
if (usepat) /* pattern on transmission */ |
357 |
> |
cvt_sdcolor(sr.rcoef, &bsv); /* use sample color */ |
358 |
> |
if (usepat) /* apply pattern? */ |
359 |
|
multcolor(sr.rcoef, ndp->pr->pcol); |
360 |
|
if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
361 |
< |
if (maxdepth > 0) |
361 |
> |
if (maxdepth > 0) |
362 |
|
break; |
363 |
< |
++nsent; /* Russian roulette victim */ |
330 |
< |
continue; |
363 |
> |
continue; /* Russian roulette victim */ |
364 |
|
} |
365 |
|
/* need to offset origin? */ |
366 |
< |
if (ndp->thick != .0 && ndp->pr->rod > .0 ^ vsmp[2] > .0) |
366 |
> |
if (ndp->thick != 0 && ndp->pr->rod > 0 ^ vsmp[2] > 0) |
367 |
|
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, -ndp->thick); |
368 |
|
rayvalue(&sr); /* send & evaluate sample */ |
369 |
|
multcolor(sr.rcol, sr.rcoef); |
370 |
|
addcolor(ndp->pr->rcol, sr.rcol); |
338 |
– |
++nsent; |
371 |
|
} |
372 |
|
return(nsent); |
373 |
|
} |
382 |
|
|
383 |
|
if (sflags == SDsampSpT) { |
384 |
|
unsc = ndp->tunsamp; |
385 |
< |
dfp = ndp->sd->tf; |
385 |
> |
if (ndp->pr->rod > 0) |
386 |
> |
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
387 |
> |
else |
388 |
> |
dfp = (ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf; |
389 |
|
cvt_sdcolor(unsc, &ndp->sd->tLamb); |
390 |
|
} else /* sflags == SDsampSpR */ { |
391 |
|
unsc = ndp->runsamp; |
392 |
< |
if (ndp->pr->rod > .0) { |
392 |
> |
if (ndp->pr->rod > 0) { |
393 |
|
dfp = ndp->sd->rf; |
394 |
|
cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
395 |
|
} else { |
406 |
|
FVECT vjit; |
407 |
|
double d; |
408 |
|
COLOR ctmp; |
409 |
< |
bsdf_jitter(vjit, ndp); |
409 |
> |
bsdf_jitter(vjit, ndp, ndp->sr_vpsa[1]); |
410 |
|
d = SDdirectHemi(vjit, sflags, ndp->sd); |
411 |
|
if (sflags == SDsampSpT) { |
412 |
|
copycolor(ctmp, ndp->pr->pcol); |
443 |
|
(m->oargs.nfargs % 3)) |
444 |
|
objerror(m, USER, "bad # arguments"); |
445 |
|
/* record surface struck */ |
446 |
< |
hitfront = (r->rod > .0); |
446 |
> |
hitfront = (r->rod > 0); |
447 |
|
/* load cal file */ |
448 |
|
mf = getfunc(m, 5, 0x1d, 1); |
449 |
+ |
setfunc(m, r); |
450 |
|
/* get thickness */ |
451 |
|
nd.thick = evalue(mf->ep[0]); |
452 |
|
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
453 |
|
nd.thick = .0; |
454 |
|
/* check shadow */ |
455 |
|
if (r->crtype & SHADOW) { |
456 |
< |
if (nd.thick != .0) |
456 |
> |
if (nd.thick != 0) |
457 |
|
raytrans(r); /* pass-through */ |
458 |
|
return(1); /* or shadow */ |
459 |
|
} |
460 |
+ |
/* check backface visibility */ |
461 |
+ |
if (!hitfront & !backvis) { |
462 |
+ |
raytrans(r); |
463 |
+ |
return(1); |
464 |
+ |
} |
465 |
|
/* check other rays to pass */ |
466 |
< |
if (nd.thick != .0 && (!(r->crtype & (SPECULAR|AMBIENT)) || |
467 |
< |
nd.thick > .0 ^ hitfront)) { |
466 |
> |
if (nd.thick != 0 && (!(r->crtype & (SPECULAR|AMBIENT)) || |
467 |
> |
(nd.thick > 0) ^ hitfront)) { |
468 |
|
raytrans(r); /* hide our proxy */ |
469 |
|
return(1); |
470 |
|
} |
479 |
|
m->oargs.farg[1], |
480 |
|
m->oargs.farg[2]); |
481 |
|
} else { |
482 |
< |
if (m->oargs.nfargs < 6) { /* check invisible backside */ |
442 |
< |
if (!backvis && (nd.sd->rb == NULL) & |
443 |
< |
(nd.sd->tf == NULL)) { |
444 |
< |
SDfreeCache(nd.sd); |
445 |
< |
raytrans(r); |
446 |
< |
return(1); |
447 |
< |
} |
482 |
> |
if (m->oargs.nfargs < 6) |
483 |
|
setcolor(nd.rdiff, .0, .0, .0); |
484 |
< |
} else |
484 |
> |
else |
485 |
|
setcolor(nd.rdiff, m->oargs.farg[3], |
486 |
|
m->oargs.farg[4], |
487 |
|
m->oargs.farg[5]); |
505 |
|
upvec[1] = evalue(mf->ep[2]); |
506 |
|
upvec[2] = evalue(mf->ep[3]); |
507 |
|
/* return to world coords */ |
508 |
< |
if (mf->f != &unitxf) { |
509 |
< |
multv3(upvec, upvec, mf->f->xfm); |
510 |
< |
nd.thick *= mf->f->sca; |
508 |
> |
if (mf->fxp != &unitxf) { |
509 |
> |
multv3(upvec, upvec, mf->fxp->xfm); |
510 |
> |
nd.thick *= mf->fxp->sca; |
511 |
|
} |
512 |
+ |
if (r->rox != NULL) { |
513 |
+ |
multv3(upvec, upvec, r->rox->f.xfm); |
514 |
+ |
nd.thick *= r->rox->f.sca; |
515 |
+ |
} |
516 |
|
raynormal(nd.pnorm, r); |
517 |
|
/* compute local BSDF xform */ |
518 |
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
524 |
|
} |
525 |
|
if (!ec) |
526 |
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
527 |
< |
/* determine BSDF resolution */ |
528 |
< |
if (!ec) |
490 |
< |
ec = SDsizeBSDF(&nd.sr_vpsa, nd.vray, SDqueryMin, nd.sd); |
491 |
< |
if (!ec) |
492 |
< |
nd.sr_vpsa = sqrt(nd.sr_vpsa); |
493 |
< |
else { |
494 |
< |
objerror(m, WARNING, transSDError(ec)); |
495 |
< |
SDfreeCache(nd.sd); |
527 |
> |
if (ec) { |
528 |
> |
objerror(m, WARNING, "Illegal orientation vector"); |
529 |
|
return(1); |
530 |
|
} |
531 |
+ |
/* determine BSDF resolution */ |
532 |
+ |
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin+SDqueryMax, nd.sd); |
533 |
+ |
if (ec) |
534 |
+ |
objerror(m, USER, transSDError(ec)); |
535 |
+ |
|
536 |
+ |
nd.sr_vpsa[0] = sqrt(nd.sr_vpsa[0]); |
537 |
+ |
nd.sr_vpsa[1] = sqrt(nd.sr_vpsa[1]); |
538 |
|
if (!hitfront) { /* perturb normal towards hit */ |
539 |
|
nd.pnorm[0] = -nd.pnorm[0]; |
540 |
|
nd.pnorm[1] = -nd.pnorm[1]; |
564 |
|
bnorm[0] = -nd.pnorm[0]; |
565 |
|
bnorm[1] = -nd.pnorm[1]; |
566 |
|
bnorm[2] = -nd.pnorm[2]; |
567 |
< |
if (nd.thick != .0) { /* proxy with offset? */ |
567 |
> |
if (nd.thick != 0) { /* proxy with offset? */ |
568 |
|
VCOPY(vtmp, r->rop); |
569 |
< |
VSUM(r->rop, vtmp, r->ron, -nd.thick); |
569 |
> |
VSUM(r->rop, vtmp, r->ron, nd.thick); |
570 |
|
multambient(ctmp, r, bnorm); |
571 |
|
VCOPY(r->rop, vtmp); |
572 |
|
} else |
576 |
|
flipsurface(r); |
577 |
|
} |
578 |
|
/* add direct component */ |
579 |
< |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL)) { |
579 |
> |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL) & |
580 |
> |
(nd.sd->tb == NULL)) { |
581 |
|
direct(r, dir_brdf, &nd); /* reflection only */ |
582 |
< |
} else if (nd.thick == .0) { |
582 |
> |
} else if (nd.thick == 0) { |
583 |
|
direct(r, dir_bsdf, &nd); /* thin surface scattering */ |
584 |
|
} else { |
585 |
|
direct(r, dir_brdf, &nd); /* reflection first */ |