13 |
|
#include "func.h" |
14 |
|
#include "bsdf.h" |
15 |
|
#include "random.h" |
16 |
+ |
#include "pmapmat.h" |
17 |
|
|
18 |
|
/* |
19 |
|
* Arguments to this material include optional diffuse colors. |
73 |
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
74 |
|
double thick; /* surface thickness */ |
75 |
|
SDData *sd; /* loaded BSDF data */ |
76 |
< |
COLOR runsamp; /* BSDF hemispherical reflection */ |
77 |
< |
COLOR rdiff; /* added diffuse reflection */ |
77 |
< |
COLOR tunsamp; /* BSDF hemispherical transmission */ |
78 |
< |
COLOR tdiff; /* added diffuse transmission */ |
76 |
> |
COLOR rdiff; /* diffuse reflection */ |
77 |
> |
COLOR tdiff; /* diffuse transmission */ |
78 |
|
} BSDFDAT; /* BSDF material data */ |
79 |
|
|
80 |
|
#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
81 |
|
|
82 |
|
/* Jitter ray sample according to projected solid angle and specjitter */ |
83 |
|
static void |
84 |
< |
bsdf_jitter(FVECT vres, BSDFDAT *ndp, int domax) |
84 |
> |
bsdf_jitter(FVECT vres, BSDFDAT *ndp, double sr_psa) |
85 |
|
{ |
87 |
– |
double sr_psa = ndp->sr_vpsa[domax]; |
88 |
– |
|
86 |
|
VCOPY(vres, ndp->vray); |
87 |
|
if (specjitter < 1.) |
88 |
|
sr_psa *= specjitter; |
97 |
|
static int |
98 |
|
direct_bsdf_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
99 |
|
{ |
100 |
< |
int nsamp = 1, ok = 0; |
100 |
> |
int nsamp, ok = 0; |
101 |
|
FVECT vsrc, vsmp, vjit; |
102 |
|
double tomega; |
103 |
< |
double sf, sd[2]; |
103 |
> |
double sf, tsr, sd[2]; |
104 |
|
COLOR csmp; |
105 |
|
SDValue sv; |
106 |
|
SDError ec; |
108 |
|
/* transform source direction */ |
109 |
|
if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) |
110 |
|
return(0); |
111 |
+ |
/* assign number of samples */ |
112 |
+ |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
113 |
+ |
if (ec) |
114 |
+ |
goto baderror; |
115 |
|
/* check indirect over-counting */ |
116 |
|
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) |
117 |
|
&& vsrc[2] > 0 ^ ndp->vray[2] > 0) { |
118 |
|
double dx = vsrc[0] + ndp->vray[0]; |
119 |
|
double dy = vsrc[1] + ndp->vray[1]; |
120 |
< |
if (dx*dx + dy*dy <= omega*(1./PI)) |
120 |
> |
if (dx*dx + dy*dy <= omega+tomega) |
121 |
|
return(0); |
122 |
|
} |
123 |
< |
if (specjitter > FTINY) { /* assign number of samples */ |
124 |
< |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
125 |
< |
if (ec) |
126 |
< |
goto baderror; |
127 |
< |
sf = specjitter * ndp->pr->rweight; |
128 |
< |
if (tomega <= omega*.01) |
129 |
< |
nsamp = 100.*sf + .5; |
130 |
< |
else |
130 |
< |
nsamp = 4.*sf*omega/tomega + .5; |
131 |
< |
nsamp += !nsamp; |
132 |
< |
} |
133 |
< |
sf = sqrt(omega); |
123 |
> |
sf = specjitter * ndp->pr->rweight; |
124 |
> |
if (tomega <= .0) |
125 |
> |
nsamp = 1; |
126 |
> |
else if (25.*tomega <= omega) |
127 |
> |
nsamp = 100.*sf + .5; |
128 |
> |
else |
129 |
> |
nsamp = 4.*sf*omega/tomega + .5; |
130 |
> |
nsamp += !nsamp; |
131 |
|
setcolor(cval, .0, .0, .0); /* sample our source area */ |
132 |
+ |
sf = sqrt(omega); |
133 |
+ |
tsr = sqrt(tomega); |
134 |
|
for (i = nsamp; i--; ) { |
135 |
|
VCOPY(vsmp, vsrc); /* jitter query directions */ |
136 |
|
if (nsamp > 1) { |
142 |
|
continue; |
143 |
|
} |
144 |
|
} |
145 |
< |
bsdf_jitter(vjit, ndp, 0); |
145 |
> |
bsdf_jitter(vjit, ndp, tsr); |
146 |
|
/* compute BSDF */ |
147 |
|
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
148 |
|
if (ec) |
158 |
|
return(ok); |
159 |
|
baderror: |
160 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
161 |
+ |
return(0); /* gratis return */ |
162 |
|
} |
163 |
|
|
164 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
199 |
|
scalecolor(ctmp, dtmp); |
200 |
|
addcolor(cval, ctmp); |
201 |
|
} |
202 |
+ |
if (ambRayInPmap(np->pr)) |
203 |
+ |
return; /* specular already in photon map */ |
204 |
|
/* |
205 |
|
* Compute scattering coefficient using BSDF. |
206 |
|
*/ |
207 |
|
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
208 |
|
return; |
209 |
< |
if (ldot > 0) { /* pattern only diffuse reflection */ |
208 |
< |
COLOR ctmp1, ctmp2; |
209 |
< |
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
210 |
< |
: np->sd->rLambBack.cieY; |
211 |
< |
/* diffuse fraction */ |
212 |
< |
dtmp /= PI * bright(ctmp); |
213 |
< |
copycolor(ctmp2, np->pr->pcol); |
214 |
< |
scalecolor(ctmp2, dtmp); |
215 |
< |
setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
216 |
< |
addcolor(ctmp1, ctmp2); |
217 |
< |
multcolor(ctmp, ctmp1); /* apply derated pattern */ |
218 |
< |
dtmp = ldot * omega; |
219 |
< |
} else { /* full pattern on transmission */ |
209 |
> |
if (ldot < 0) { /* pattern for specular transmission */ |
210 |
|
multcolor(ctmp, np->pr->pcol); |
211 |
|
dtmp = -ldot * omega; |
212 |
< |
} |
212 |
> |
} else |
213 |
> |
dtmp = ldot * omega; |
214 |
|
scalecolor(ctmp, dtmp); |
215 |
|
addcolor(cval, ctmp); |
216 |
|
} |
245 |
|
scalecolor(ctmp, dtmp); |
246 |
|
addcolor(cval, ctmp); |
247 |
|
} |
248 |
+ |
if (ambRayInPmap(np->pr)) |
249 |
+ |
return; /* specular already in photon map */ |
250 |
|
/* |
251 |
|
* Compute reflection coefficient using BSDF. |
252 |
|
*/ |
253 |
|
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
254 |
|
return; |
262 |
– |
/* pattern only diffuse reflection */ |
263 |
– |
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
264 |
– |
: np->sd->rLambBack.cieY; |
265 |
– |
dtmp /= PI * bright(ctmp); /* diffuse fraction */ |
266 |
– |
copycolor(ctmp2, np->pr->pcol); |
267 |
– |
scalecolor(ctmp2, dtmp); |
268 |
– |
setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
269 |
– |
addcolor(ctmp1, ctmp2); |
270 |
– |
multcolor(ctmp, ctmp1); /* apply derated pattern */ |
255 |
|
dtmp = ldot * omega; |
256 |
|
scalecolor(ctmp, dtmp); |
257 |
|
addcolor(cval, ctmp); |
287 |
|
scalecolor(ctmp, dtmp); |
288 |
|
addcolor(cval, ctmp); |
289 |
|
} |
290 |
+ |
if (ambRayInPmap(np->pr)) |
291 |
+ |
return; /* specular already in photon map */ |
292 |
|
/* |
293 |
|
* Compute scattering coefficient using BSDF. |
294 |
|
*/ |
319 |
|
} |
320 |
|
/* run through our samples */ |
321 |
|
for (nsent = 0; nsent < nstarget; nsent++) { |
322 |
< |
if (nstarget == 1) /* stratify random variable */ |
322 |
> |
if (nstarget == 1) { /* stratify random variable */ |
323 |
|
xrand = urand(ilhash(dimlist,ndims)+samplendx); |
324 |
< |
else |
324 |
> |
if (specjitter < 1.) |
325 |
> |
xrand = .5 + specjitter*(xrand-.5); |
326 |
> |
} else { |
327 |
|
xrand = (nsent + frandom())/(double)nstarget; |
328 |
+ |
} |
329 |
|
SDerrorDetail[0] = '\0'; /* sample direction & coef. */ |
330 |
< |
bsdf_jitter(vsmp, ndp, 0); |
330 |
> |
bsdf_jitter(vsmp, ndp, ndp->sr_vpsa[0]); |
331 |
|
ec = SDsampComponent(&bsv, vsmp, xrand, dcp); |
332 |
|
if (ec) |
333 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
366 |
|
COLORV *unsc; |
367 |
|
|
368 |
|
if (sflags == SDsampSpT) { |
369 |
< |
unsc = ndp->tunsamp; |
370 |
< |
dfp = ndp->sd->tf; |
371 |
< |
cvt_sdcolor(unsc, &ndp->sd->tLamb); |
369 |
> |
unsc = ndp->tdiff; |
370 |
> |
if (ndp->pr->rod > 0) |
371 |
> |
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
372 |
> |
else |
373 |
> |
dfp = (ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf; |
374 |
|
} else /* sflags == SDsampSpR */ { |
375 |
< |
unsc = ndp->runsamp; |
376 |
< |
if (ndp->pr->rod > 0) { |
375 |
> |
unsc = ndp->rdiff; |
376 |
> |
if (ndp->pr->rod > 0) |
377 |
|
dfp = ndp->sd->rf; |
378 |
< |
cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
388 |
< |
} else { |
378 |
> |
else |
379 |
|
dfp = ndp->sd->rb; |
390 |
– |
cvt_sdcolor(unsc, &ndp->sd->rLambBack); |
391 |
– |
} |
380 |
|
} |
393 |
– |
multcolor(unsc, ndp->pr->pcol); |
381 |
|
if (dfp == NULL) /* no specular component? */ |
382 |
|
return(0); |
383 |
|
/* below sampling threshold? */ |
386 |
|
FVECT vjit; |
387 |
|
double d; |
388 |
|
COLOR ctmp; |
389 |
< |
bsdf_jitter(vjit, ndp, 1); |
389 |
> |
bsdf_jitter(vjit, ndp, ndp->sr_vpsa[1]); |
390 |
|
d = SDdirectHemi(vjit, sflags, ndp->sd); |
391 |
|
if (sflags == SDsampSpT) { |
392 |
|
copycolor(ctmp, ndp->pr->pcol); |
426 |
|
hitfront = (r->rod > 0); |
427 |
|
/* load cal file */ |
428 |
|
mf = getfunc(m, 5, 0x1d, 1); |
429 |
+ |
setfunc(m, r); |
430 |
|
/* get thickness */ |
431 |
|
nd.thick = evalue(mf->ep[0]); |
432 |
|
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
437 |
|
raytrans(r); /* pass-through */ |
438 |
|
return(1); /* or shadow */ |
439 |
|
} |
440 |
+ |
/* check backface visibility */ |
441 |
+ |
if (!hitfront & !backvis) { |
442 |
+ |
raytrans(r); |
443 |
+ |
return(1); |
444 |
+ |
} |
445 |
|
/* check other rays to pass */ |
446 |
|
if (nd.thick != 0 && (!(r->crtype & (SPECULAR|AMBIENT)) || |
447 |
< |
nd.thick > 0 ^ hitfront)) { |
447 |
> |
(nd.thick > 0) ^ hitfront)) { |
448 |
|
raytrans(r); /* hide our proxy */ |
449 |
|
return(1); |
450 |
|
} |
451 |
+ |
nd.mp = m; |
452 |
+ |
nd.pr = r; |
453 |
|
/* get BSDF data */ |
454 |
|
nd.sd = loadBSDF(m->oargs.sarg[1]); |
455 |
|
/* diffuse reflectance */ |
456 |
|
if (hitfront) { |
457 |
< |
if (m->oargs.nfargs < 3) |
458 |
< |
setcolor(nd.rdiff, .0, .0, .0); |
459 |
< |
else |
465 |
< |
setcolor(nd.rdiff, m->oargs.farg[0], |
457 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambFront); |
458 |
> |
if (m->oargs.nfargs >= 3) { |
459 |
> |
setcolor(ctmp, m->oargs.farg[0], |
460 |
|
m->oargs.farg[1], |
461 |
|
m->oargs.farg[2]); |
462 |
+ |
addcolor(nd.rdiff, ctmp); |
463 |
+ |
} |
464 |
|
} else { |
465 |
< |
if (m->oargs.nfargs < 6) { /* check invisible backside */ |
466 |
< |
if (!backvis && (nd.sd->rb == NULL) & |
467 |
< |
(nd.sd->tf == NULL)) { |
472 |
< |
SDfreeCache(nd.sd); |
473 |
< |
raytrans(r); |
474 |
< |
return(1); |
475 |
< |
} |
476 |
< |
setcolor(nd.rdiff, .0, .0, .0); |
477 |
< |
} else |
478 |
< |
setcolor(nd.rdiff, m->oargs.farg[3], |
465 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambBack); |
466 |
> |
if (m->oargs.nfargs >= 6) { |
467 |
> |
setcolor(ctmp, m->oargs.farg[3], |
468 |
|
m->oargs.farg[4], |
469 |
|
m->oargs.farg[5]); |
470 |
+ |
addcolor(nd.rdiff, ctmp); |
471 |
+ |
} |
472 |
|
} |
473 |
|
/* diffuse transmittance */ |
474 |
< |
if (m->oargs.nfargs < 9) |
475 |
< |
setcolor(nd.tdiff, .0, .0, .0); |
476 |
< |
else |
486 |
< |
setcolor(nd.tdiff, m->oargs.farg[6], |
474 |
> |
cvt_sdcolor(nd.tdiff, &nd.sd->tLamb); |
475 |
> |
if (m->oargs.nfargs >= 9) { |
476 |
> |
setcolor(ctmp, m->oargs.farg[6], |
477 |
|
m->oargs.farg[7], |
478 |
|
m->oargs.farg[8]); |
479 |
< |
nd.mp = m; |
480 |
< |
nd.pr = r; |
479 |
> |
addcolor(nd.tdiff, ctmp); |
480 |
> |
} |
481 |
|
/* get modifiers */ |
482 |
|
raytexture(r, m->omod); |
483 |
|
/* modify diffuse values */ |
488 |
|
upvec[1] = evalue(mf->ep[2]); |
489 |
|
upvec[2] = evalue(mf->ep[3]); |
490 |
|
/* return to world coords */ |
491 |
< |
if (mf->f != &unitxf) { |
492 |
< |
multv3(upvec, upvec, mf->f->xfm); |
493 |
< |
nd.thick *= mf->f->sca; |
491 |
> |
if (mf->fxp != &unitxf) { |
492 |
> |
multv3(upvec, upvec, mf->fxp->xfm); |
493 |
> |
nd.thick *= mf->fxp->sca; |
494 |
|
} |
495 |
+ |
if (r->rox != NULL) { |
496 |
+ |
multv3(upvec, upvec, r->rox->f.xfm); |
497 |
+ |
nd.thick *= r->rox->f.sca; |
498 |
+ |
} |
499 |
|
raynormal(nd.pnorm, r); |
500 |
|
/* compute local BSDF xform */ |
501 |
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
507 |
|
} |
508 |
|
if (!ec) |
509 |
|
ec = SDinvXform(nd.fromloc, nd.toloc); |
516 |
– |
/* determine BSDF resolution */ |
517 |
– |
if (!ec) |
518 |
– |
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, |
519 |
– |
SDqueryMin+SDqueryMax, nd.sd); |
510 |
|
if (ec) { |
511 |
< |
objerror(m, WARNING, transSDError(ec)); |
522 |
< |
SDfreeCache(nd.sd); |
511 |
> |
objerror(m, WARNING, "Illegal orientation vector"); |
512 |
|
return(1); |
513 |
|
} |
514 |
+ |
/* determine BSDF resolution */ |
515 |
+ |
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin+SDqueryMax, nd.sd); |
516 |
+ |
if (ec) |
517 |
+ |
objerror(m, USER, transSDError(ec)); |
518 |
+ |
|
519 |
|
nd.sr_vpsa[0] = sqrt(nd.sr_vpsa[0]); |
520 |
|
nd.sr_vpsa[1] = sqrt(nd.sr_vpsa[1]); |
521 |
|
if (!hitfront) { /* perturb normal towards hit */ |
528 |
|
/* sample transmission */ |
529 |
|
sample_sdf(&nd, SDsampSpT); |
530 |
|
/* compute indirect diffuse */ |
531 |
< |
copycolor(ctmp, nd.rdiff); |
538 |
< |
addcolor(ctmp, nd.runsamp); |
539 |
< |
if (bright(ctmp) > FTINY) { /* ambient from reflection */ |
531 |
> |
if (bright(nd.rdiff) > FTINY) { /* ambient from reflection */ |
532 |
|
if (!hitfront) |
533 |
|
flipsurface(r); |
534 |
+ |
copycolor(ctmp, nd.rdiff); |
535 |
|
multambient(ctmp, r, nd.pnorm); |
536 |
|
addcolor(r->rcol, ctmp); |
537 |
|
if (!hitfront) |
538 |
|
flipsurface(r); |
539 |
|
} |
540 |
< |
copycolor(ctmp, nd.tdiff); |
548 |
< |
addcolor(ctmp, nd.tunsamp); |
549 |
< |
if (bright(ctmp) > FTINY) { /* ambient from other side */ |
540 |
> |
if (bright(nd.tdiff) > FTINY) { /* ambient from other side */ |
541 |
|
FVECT bnorm; |
542 |
|
if (hitfront) |
543 |
|
flipsurface(r); |
544 |
|
bnorm[0] = -nd.pnorm[0]; |
545 |
|
bnorm[1] = -nd.pnorm[1]; |
546 |
|
bnorm[2] = -nd.pnorm[2]; |
547 |
+ |
copycolor(ctmp, nd.tdiff); |
548 |
|
if (nd.thick != 0) { /* proxy with offset? */ |
549 |
|
VCOPY(vtmp, r->rop); |
550 |
< |
VSUM(r->rop, vtmp, r->ron, -nd.thick); |
550 |
> |
VSUM(r->rop, vtmp, r->ron, nd.thick); |
551 |
|
multambient(ctmp, r, bnorm); |
552 |
|
VCOPY(r->rop, vtmp); |
553 |
|
} else |
557 |
|
flipsurface(r); |
558 |
|
} |
559 |
|
/* add direct component */ |
560 |
< |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL)) { |
560 |
> |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL) & |
561 |
> |
(nd.sd->tb == NULL)) { |
562 |
|
direct(r, dir_brdf, &nd); /* reflection only */ |
563 |
|
} else if (nd.thick == 0) { |
564 |
|
direct(r, dir_bsdf, &nd); /* thin surface scattering */ |