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]; |
104 |
< |
COLOR csmp; |
103 |
> |
double sf, tsr, sd[2]; |
104 |
> |
COLOR csmp, cdiff; |
105 |
> |
double diffY; |
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 |
+ |
/* will discount diffuse portion */ |
113 |
+ |
switch ((vsrc[2] > 0)<<1 | (ndp->vray[2] > 0)) { |
114 |
+ |
case 3: |
115 |
+ |
if (ndp->sd->rf == NULL) |
116 |
+ |
return(0); /* all diffuse */ |
117 |
+ |
sv = ndp->sd->rLambFront; |
118 |
+ |
break; |
119 |
+ |
case 0: |
120 |
+ |
if (ndp->sd->rb == NULL) |
121 |
+ |
return(0); /* all diffuse */ |
122 |
+ |
sv = ndp->sd->rLambBack; |
123 |
+ |
break; |
124 |
+ |
default: |
125 |
+ |
if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) |
126 |
+ |
return(0); /* all diffuse */ |
127 |
+ |
sv = ndp->sd->tLamb; |
128 |
+ |
break; |
129 |
+ |
} |
130 |
+ |
if ((sv.cieY *= 1./PI) > FTINY) { |
131 |
+ |
diffY = sv.cieY; |
132 |
+ |
cvt_sdcolor(cdiff, &sv); |
133 |
+ |
} else { |
134 |
+ |
diffY = .0; |
135 |
+ |
setcolor(cdiff, .0, .0, .0); |
136 |
+ |
} |
137 |
+ |
/* assign number of samples */ |
138 |
+ |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
139 |
+ |
if (ec) |
140 |
+ |
goto baderror; |
141 |
|
/* check indirect over-counting */ |
142 |
|
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) |
143 |
< |
&& vsrc[2] > 0 ^ ndp->vray[2] > 0) { |
143 |
> |
&& (vsrc[2] > 0) ^ (ndp->vray[2] > 0)) { |
144 |
|
double dx = vsrc[0] + ndp->vray[0]; |
145 |
|
double dy = vsrc[1] + ndp->vray[1]; |
146 |
< |
if (dx*dx + dy*dy <= omega*(1./PI)) |
146 |
> |
if (dx*dx + dy*dy <= omega+tomega) |
147 |
|
return(0); |
148 |
|
} |
149 |
< |
if (specjitter > FTINY) { /* assign number of samples */ |
150 |
< |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
151 |
< |
if (ec) |
152 |
< |
goto baderror; |
153 |
< |
sf = specjitter * ndp->pr->rweight; |
154 |
< |
if (tomega <= omega*.01) |
155 |
< |
nsamp = 100.*sf + .5; |
156 |
< |
else |
130 |
< |
nsamp = 4.*sf*omega/tomega + .5; |
131 |
< |
nsamp += !nsamp; |
132 |
< |
} |
133 |
< |
sf = sqrt(omega); |
149 |
> |
sf = specjitter * ndp->pr->rweight; |
150 |
> |
if (tomega <= .0) |
151 |
> |
nsamp = 1; |
152 |
> |
else if (25.*tomega <= omega) |
153 |
> |
nsamp = 100.*sf + .5; |
154 |
> |
else |
155 |
> |
nsamp = 4.*sf*omega/tomega + .5; |
156 |
> |
nsamp += !nsamp; |
157 |
|
setcolor(cval, .0, .0, .0); /* sample our source area */ |
158 |
+ |
sf = sqrt(omega); |
159 |
+ |
tsr = sqrt(tomega); |
160 |
|
for (i = nsamp; i--; ) { |
161 |
|
VCOPY(vsmp, vsrc); /* jitter query directions */ |
162 |
|
if (nsamp > 1) { |
168 |
|
continue; |
169 |
|
} |
170 |
|
} |
171 |
< |
bsdf_jitter(vjit, ndp, 0); |
171 |
> |
bsdf_jitter(vjit, ndp, tsr); |
172 |
|
/* compute BSDF */ |
173 |
|
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
174 |
|
if (ec) |
175 |
|
goto baderror; |
176 |
< |
if (sv.cieY <= FTINY) /* worth using? */ |
177 |
< |
continue; |
176 |
> |
if (sv.cieY - diffY <= FTINY) { |
177 |
> |
addcolor(cval, cdiff); |
178 |
> |
continue; /* no specular part */ |
179 |
> |
} |
180 |
|
cvt_sdcolor(csmp, &sv); |
181 |
< |
addcolor(cval, csmp); /* average it in */ |
181 |
> |
addcolor(cval, csmp); /* else average it in */ |
182 |
|
++ok; |
183 |
|
} |
184 |
+ |
if (!ok) { |
185 |
+ |
setcolor(cval, .0, .0, .0); |
186 |
+ |
return(0); /* no valid specular samples */ |
187 |
+ |
} |
188 |
|
sf = 1./(double)nsamp; |
189 |
|
scalecolor(cval, sf); |
190 |
< |
return(ok); |
190 |
> |
/* subtract diffuse contribution */ |
191 |
> |
for (i = 3*(diffY > FTINY); i--; ) |
192 |
> |
if ((colval(cval,i) -= colval(cdiff,i)) < .0) |
193 |
> |
colval(cval,i) = .0; |
194 |
> |
return(1); |
195 |
|
baderror: |
196 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
197 |
+ |
return(0); /* gratis return */ |
198 |
|
} |
199 |
|
|
200 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
235 |
|
scalecolor(ctmp, dtmp); |
236 |
|
addcolor(cval, ctmp); |
237 |
|
} |
238 |
+ |
if (ambRayInPmap(np->pr)) |
239 |
+ |
return; /* specular already in photon map */ |
240 |
|
/* |
241 |
|
* Compute scattering coefficient using BSDF. |
242 |
|
*/ |
243 |
|
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
244 |
|
return; |
245 |
< |
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 */ |
245 |
> |
if (ldot < 0) { /* pattern for specular transmission */ |
246 |
|
multcolor(ctmp, np->pr->pcol); |
247 |
|
dtmp = -ldot * omega; |
248 |
< |
} |
248 |
> |
} else |
249 |
> |
dtmp = ldot * omega; |
250 |
|
scalecolor(ctmp, dtmp); |
251 |
|
addcolor(cval, ctmp); |
252 |
|
} |
281 |
|
scalecolor(ctmp, dtmp); |
282 |
|
addcolor(cval, ctmp); |
283 |
|
} |
284 |
+ |
if (ambRayInPmap(np->pr)) |
285 |
+ |
return; /* specular already in photon map */ |
286 |
|
/* |
287 |
|
* Compute reflection coefficient using BSDF. |
288 |
|
*/ |
289 |
|
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
290 |
|
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 */ |
291 |
|
dtmp = ldot * omega; |
292 |
|
scalecolor(ctmp, dtmp); |
293 |
|
addcolor(cval, ctmp); |
323 |
|
scalecolor(ctmp, dtmp); |
324 |
|
addcolor(cval, ctmp); |
325 |
|
} |
326 |
+ |
if (ambRayInPmap(np->pr)) |
327 |
+ |
return; /* specular already in photon map */ |
328 |
|
/* |
329 |
|
* Compute scattering coefficient using BSDF. |
330 |
|
*/ |
355 |
|
} |
356 |
|
/* run through our samples */ |
357 |
|
for (nsent = 0; nsent < nstarget; nsent++) { |
358 |
< |
if (nstarget == 1) /* stratify random variable */ |
358 |
> |
if (nstarget == 1) { /* stratify random variable */ |
359 |
|
xrand = urand(ilhash(dimlist,ndims)+samplendx); |
360 |
< |
else |
360 |
> |
if (specjitter < 1.) |
361 |
> |
xrand = .5 + specjitter*(xrand-.5); |
362 |
> |
} else { |
363 |
|
xrand = (nsent + frandom())/(double)nstarget; |
364 |
+ |
} |
365 |
|
SDerrorDetail[0] = '\0'; /* sample direction & coef. */ |
366 |
< |
bsdf_jitter(vsmp, ndp, 0); |
366 |
> |
bsdf_jitter(vsmp, ndp, ndp->sr_vpsa[0]); |
367 |
|
ec = SDsampComponent(&bsv, vsmp, xrand, dcp); |
368 |
|
if (ec) |
369 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
384 |
|
continue; /* Russian roulette victim */ |
385 |
|
} |
386 |
|
/* need to offset origin? */ |
387 |
< |
if (ndp->thick != 0 && ndp->pr->rod > 0 ^ vsmp[2] > 0) |
387 |
> |
if (ndp->thick != 0 && (ndp->pr->rod > 0) ^ (vsmp[2] > 0)) |
388 |
|
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, -ndp->thick); |
389 |
|
rayvalue(&sr); /* send & evaluate sample */ |
390 |
|
multcolor(sr.rcol, sr.rcoef); |
402 |
|
COLORV *unsc; |
403 |
|
|
404 |
|
if (sflags == SDsampSpT) { |
405 |
< |
unsc = ndp->tunsamp; |
406 |
< |
dfp = ndp->sd->tf; |
407 |
< |
cvt_sdcolor(unsc, &ndp->sd->tLamb); |
405 |
> |
unsc = ndp->tdiff; |
406 |
> |
if (ndp->pr->rod > 0) |
407 |
> |
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
408 |
> |
else |
409 |
> |
dfp = (ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf; |
410 |
|
} else /* sflags == SDsampSpR */ { |
411 |
< |
unsc = ndp->runsamp; |
412 |
< |
if (ndp->pr->rod > 0) { |
411 |
> |
unsc = ndp->rdiff; |
412 |
> |
if (ndp->pr->rod > 0) |
413 |
|
dfp = ndp->sd->rf; |
414 |
< |
cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
388 |
< |
} else { |
414 |
> |
else |
415 |
|
dfp = ndp->sd->rb; |
390 |
– |
cvt_sdcolor(unsc, &ndp->sd->rLambBack); |
391 |
– |
} |
416 |
|
} |
393 |
– |
multcolor(unsc, ndp->pr->pcol); |
417 |
|
if (dfp == NULL) /* no specular component? */ |
418 |
|
return(0); |
419 |
|
/* below sampling threshold? */ |
422 |
|
FVECT vjit; |
423 |
|
double d; |
424 |
|
COLOR ctmp; |
425 |
< |
bsdf_jitter(vjit, ndp, 1); |
425 |
> |
bsdf_jitter(vjit, ndp, ndp->sr_vpsa[1]); |
426 |
|
d = SDdirectHemi(vjit, sflags, ndp->sd); |
427 |
|
if (sflags == SDsampSpT) { |
428 |
|
copycolor(ctmp, ndp->pr->pcol); |
462 |
|
hitfront = (r->rod > 0); |
463 |
|
/* load cal file */ |
464 |
|
mf = getfunc(m, 5, 0x1d, 1); |
465 |
+ |
setfunc(m, r); |
466 |
|
/* get thickness */ |
467 |
|
nd.thick = evalue(mf->ep[0]); |
468 |
|
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
473 |
|
raytrans(r); /* pass-through */ |
474 |
|
return(1); /* or shadow */ |
475 |
|
} |
476 |
+ |
/* check backface visibility */ |
477 |
+ |
if (!hitfront & !backvis) { |
478 |
+ |
raytrans(r); |
479 |
+ |
return(1); |
480 |
+ |
} |
481 |
|
/* check other rays to pass */ |
482 |
|
if (nd.thick != 0 && (!(r->crtype & (SPECULAR|AMBIENT)) || |
483 |
< |
nd.thick > 0 ^ hitfront)) { |
483 |
> |
(nd.thick > 0) ^ hitfront)) { |
484 |
|
raytrans(r); /* hide our proxy */ |
485 |
|
return(1); |
486 |
|
} |
487 |
+ |
nd.mp = m; |
488 |
+ |
nd.pr = r; |
489 |
|
/* get BSDF data */ |
490 |
|
nd.sd = loadBSDF(m->oargs.sarg[1]); |
491 |
|
/* diffuse reflectance */ |
492 |
|
if (hitfront) { |
493 |
< |
if (m->oargs.nfargs < 3) |
494 |
< |
setcolor(nd.rdiff, .0, .0, .0); |
495 |
< |
else |
465 |
< |
setcolor(nd.rdiff, m->oargs.farg[0], |
493 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambFront); |
494 |
> |
if (m->oargs.nfargs >= 3) { |
495 |
> |
setcolor(ctmp, m->oargs.farg[0], |
496 |
|
m->oargs.farg[1], |
497 |
|
m->oargs.farg[2]); |
498 |
+ |
addcolor(nd.rdiff, ctmp); |
499 |
+ |
} |
500 |
|
} else { |
501 |
< |
if (m->oargs.nfargs < 6) { /* check invisible backside */ |
502 |
< |
if (!backvis && (nd.sd->rb == NULL) & |
503 |
< |
(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], |
501 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambBack); |
502 |
> |
if (m->oargs.nfargs >= 6) { |
503 |
> |
setcolor(ctmp, m->oargs.farg[3], |
504 |
|
m->oargs.farg[4], |
505 |
|
m->oargs.farg[5]); |
506 |
+ |
addcolor(nd.rdiff, ctmp); |
507 |
+ |
} |
508 |
|
} |
509 |
|
/* diffuse transmittance */ |
510 |
< |
if (m->oargs.nfargs < 9) |
511 |
< |
setcolor(nd.tdiff, .0, .0, .0); |
512 |
< |
else |
486 |
< |
setcolor(nd.tdiff, m->oargs.farg[6], |
510 |
> |
cvt_sdcolor(nd.tdiff, &nd.sd->tLamb); |
511 |
> |
if (m->oargs.nfargs >= 9) { |
512 |
> |
setcolor(ctmp, m->oargs.farg[6], |
513 |
|
m->oargs.farg[7], |
514 |
|
m->oargs.farg[8]); |
515 |
< |
nd.mp = m; |
516 |
< |
nd.pr = r; |
515 |
> |
addcolor(nd.tdiff, ctmp); |
516 |
> |
} |
517 |
|
/* get modifiers */ |
518 |
|
raytexture(r, m->omod); |
519 |
|
/* modify diffuse values */ |
524 |
|
upvec[1] = evalue(mf->ep[2]); |
525 |
|
upvec[2] = evalue(mf->ep[3]); |
526 |
|
/* return to world coords */ |
527 |
< |
if (mf->f != &unitxf) { |
528 |
< |
multv3(upvec, upvec, mf->f->xfm); |
529 |
< |
nd.thick *= mf->f->sca; |
527 |
> |
if (mf->fxp != &unitxf) { |
528 |
> |
multv3(upvec, upvec, mf->fxp->xfm); |
529 |
> |
nd.thick *= mf->fxp->sca; |
530 |
|
} |
531 |
+ |
if (r->rox != NULL) { |
532 |
+ |
multv3(upvec, upvec, r->rox->f.xfm); |
533 |
+ |
nd.thick *= r->rox->f.sca; |
534 |
+ |
} |
535 |
|
raynormal(nd.pnorm, r); |
536 |
|
/* compute local BSDF xform */ |
537 |
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
543 |
|
} |
544 |
|
if (!ec) |
545 |
|
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); |
546 |
|
if (ec) { |
547 |
< |
objerror(m, WARNING, transSDError(ec)); |
522 |
< |
SDfreeCache(nd.sd); |
547 |
> |
objerror(m, WARNING, "Illegal orientation vector"); |
548 |
|
return(1); |
549 |
|
} |
550 |
+ |
/* determine BSDF resolution */ |
551 |
+ |
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, SDqueryMin+SDqueryMax, nd.sd); |
552 |
+ |
if (ec) |
553 |
+ |
objerror(m, USER, transSDError(ec)); |
554 |
+ |
|
555 |
|
nd.sr_vpsa[0] = sqrt(nd.sr_vpsa[0]); |
556 |
|
nd.sr_vpsa[1] = sqrt(nd.sr_vpsa[1]); |
557 |
|
if (!hitfront) { /* perturb normal towards hit */ |
564 |
|
/* sample transmission */ |
565 |
|
sample_sdf(&nd, SDsampSpT); |
566 |
|
/* compute indirect diffuse */ |
567 |
< |
copycolor(ctmp, nd.rdiff); |
538 |
< |
addcolor(ctmp, nd.runsamp); |
539 |
< |
if (bright(ctmp) > FTINY) { /* ambient from reflection */ |
567 |
> |
if (bright(nd.rdiff) > FTINY) { /* ambient from reflection */ |
568 |
|
if (!hitfront) |
569 |
|
flipsurface(r); |
570 |
+ |
copycolor(ctmp, nd.rdiff); |
571 |
|
multambient(ctmp, r, nd.pnorm); |
572 |
|
addcolor(r->rcol, ctmp); |
573 |
|
if (!hitfront) |
574 |
|
flipsurface(r); |
575 |
|
} |
576 |
< |
copycolor(ctmp, nd.tdiff); |
548 |
< |
addcolor(ctmp, nd.tunsamp); |
549 |
< |
if (bright(ctmp) > FTINY) { /* ambient from other side */ |
576 |
> |
if (bright(nd.tdiff) > FTINY) { /* ambient from other side */ |
577 |
|
FVECT bnorm; |
578 |
|
if (hitfront) |
579 |
|
flipsurface(r); |
580 |
|
bnorm[0] = -nd.pnorm[0]; |
581 |
|
bnorm[1] = -nd.pnorm[1]; |
582 |
|
bnorm[2] = -nd.pnorm[2]; |
583 |
+ |
copycolor(ctmp, nd.tdiff); |
584 |
|
if (nd.thick != 0) { /* proxy with offset? */ |
585 |
|
VCOPY(vtmp, r->rop); |
586 |
< |
VSUM(r->rop, vtmp, r->ron, -nd.thick); |
586 |
> |
VSUM(r->rop, vtmp, r->ron, nd.thick); |
587 |
|
multambient(ctmp, r, bnorm); |
588 |
|
VCOPY(r->rop, vtmp); |
589 |
|
} else |
593 |
|
flipsurface(r); |
594 |
|
} |
595 |
|
/* add direct component */ |
596 |
< |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL)) { |
596 |
> |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL) & |
597 |
> |
(nd.sd->tb == NULL)) { |
598 |
|
direct(r, dir_brdf, &nd); /* reflection only */ |
599 |
|
} else if (nd.thick == 0) { |
600 |
|
direct(r, dir_bsdf, &nd); /* thin surface scattering */ |