68 |
|
FVECT pnorm; /* perturbed surface normal */ |
69 |
|
FVECT vray; /* local outgoing (return) vector */ |
70 |
|
double sr_vpsa[2]; /* sqrt of BSDF projected solid angle extrema */ |
71 |
– |
double thru_psa; /* through direction projected solid angle */ |
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 */ |
98 |
|
|
99 |
|
/* Evaluate BSDF for direct component, returning true if OK to proceed */ |
100 |
|
static int |
101 |
< |
direct_bsdf_OK(COLOR cval, FVECT ldir, BSDFDAT *ndp) |
101 |
> |
direct_bsdf_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
102 |
|
{ |
103 |
< |
FVECT vsrc, vjit; |
103 |
> |
int nsamp = 1, ok = 0; |
104 |
> |
FVECT vsrc, vsmp, vjit; |
105 |
> |
double tomega; |
106 |
> |
double sf, sd[2]; |
107 |
> |
COLOR csmp; |
108 |
|
SDValue sv; |
109 |
|
SDError ec; |
110 |
+ |
int i; |
111 |
|
/* transform source direction */ |
112 |
|
if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) |
113 |
|
return(0); |
114 |
< |
/* jitter query direction */ |
115 |
< |
bsdf_jitter(vjit, ndp, 0); |
116 |
< |
/* avoid indirect over-counting */ |
117 |
< |
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) && |
118 |
< |
vsrc[2] > 0 ^ vjit[2] > 0) { |
119 |
< |
double dx = vsrc[0] + vjit[0]; |
116 |
< |
double dy = vsrc[1] + vjit[1]; |
117 |
< |
if (dx*dx + dy*dy <= ndp->thru_psa) |
114 |
> |
/* check indirect over-counting */ |
115 |
> |
if (ndp->thick != 0 && ndp->pr->crtype & (SPECULAR|AMBIENT) |
116 |
> |
&& vsrc[2] > 0 ^ ndp->vray[2] > 0) { |
117 |
> |
double dx = vsrc[0] + ndp->vray[0]; |
118 |
> |
double dy = vsrc[1] + ndp->vray[1]; |
119 |
> |
if (dx*dx + dy*dy <= omega*(1./PI)) |
120 |
|
return(0); |
121 |
|
} |
122 |
< |
ec = SDevalBSDF(&sv, vjit, vsrc, ndp->sd); |
123 |
< |
if (ec) |
124 |
< |
objerror(ndp->mp, USER, transSDError(ec)); |
125 |
< |
|
126 |
< |
if (sv.cieY <= FTINY) /* not worth using? */ |
127 |
< |
return(0); |
128 |
< |
/* else we're good to go */ |
129 |
< |
cvt_sdcolor(cval, &sv); |
130 |
< |
return(1); |
122 |
> |
if (specjitter > FTINY) { /* assign number of samples */ |
123 |
> |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
124 |
> |
if (ec) |
125 |
> |
goto baderror; |
126 |
> |
sf = specjitter * ndp->pr->rweight; |
127 |
> |
if (tomega <= omega*.01) |
128 |
> |
nsamp = 100.*sf + .5; |
129 |
> |
else |
130 |
> |
nsamp = 4.*sf*omega/tomega + .5; |
131 |
> |
nsamp += !nsamp; |
132 |
> |
} |
133 |
> |
sf = sqrt(omega); |
134 |
> |
setcolor(cval, .0, .0, .0); /* sample our source area */ |
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, 0); |
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 |
|
} |
163 |
|
|
164 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
202 |
|
/* |
203 |
|
* Compute scattering coefficient using BSDF. |
204 |
|
*/ |
205 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
205 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
206 |
|
return; |
207 |
|
if (ldot > 0) { /* pattern only diffuse reflection */ |
208 |
|
COLOR ctmp1, ctmp2; |
257 |
|
/* |
258 |
|
* Compute reflection coefficient using BSDF. |
259 |
|
*/ |
260 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
260 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
261 |
|
return; |
262 |
|
/* pattern only diffuse reflection */ |
263 |
|
dtmp = (np->pr->rod > 0) ? np->sd->rLambFront.cieY |
306 |
|
/* |
307 |
|
* Compute scattering coefficient using BSDF. |
308 |
|
*/ |
309 |
< |
if (!direct_bsdf_OK(ctmp, ldir, np)) |
309 |
> |
if (!direct_bsdf_OK(ctmp, ldir, omega, np)) |
310 |
|
return; |
311 |
|
/* full pattern on transmission */ |
312 |
|
multcolor(ctmp, np->pr->pcol); |
320 |
|
sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat) |
321 |
|
{ |
322 |
|
int nstarget = 1; |
323 |
< |
int nsent = 0; |
323 |
> |
int nsent; |
324 |
|
SDError ec; |
325 |
|
SDValue bsv; |
326 |
< |
double sthick; |
327 |
< |
FVECT vjit, vsmp; |
326 |
> |
double xrand; |
327 |
> |
FVECT vsmp; |
328 |
|
RAY sr; |
296 |
– |
int ntrials; |
329 |
|
/* multiple samples? */ |
330 |
|
if (specjitter > 1.5) { |
331 |
|
nstarget = specjitter*ndp->pr->rweight + .5; |
332 |
< |
if (nstarget < 1) |
301 |
< |
nstarget = 1; |
332 |
> |
nstarget += !nstarget; |
333 |
|
} |
334 |
< |
/* run through our trials */ |
335 |
< |
for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
336 |
< |
SDerrorDetail[0] = '\0'; |
337 |
< |
/* sample direction & coef. */ |
338 |
< |
bsdf_jitter(vjit, ndp, 0); |
339 |
< |
ec = SDsampComponent(&bsv, vsmp, vjit, ntrials ? frandom() |
340 |
< |
: urand(ilhash(dimlist,ndims)+samplendx), dcp); |
334 |
> |
/* run through our samples */ |
335 |
> |
for (nsent = 0; nsent < nstarget; nsent++) { |
336 |
> |
if (nstarget == 1) /* stratify random variable */ |
337 |
> |
xrand = urand(ilhash(dimlist,ndims)+samplendx); |
338 |
> |
else |
339 |
> |
xrand = (nsent + frandom())/(double)nstarget; |
340 |
> |
SDerrorDetail[0] = '\0'; /* sample direction & coef. */ |
341 |
> |
bsdf_jitter(vsmp, ndp, 0); |
342 |
> |
ec = SDsampComponent(&bsv, vsmp, xrand, dcp); |
343 |
|
if (ec) |
344 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
345 |
< |
/* zero component? */ |
313 |
< |
if (bsv.cieY <= FTINY) |
345 |
> |
if (bsv.cieY <= FTINY) /* zero component? */ |
346 |
|
break; |
347 |
|
/* map vector to world */ |
348 |
|
if (SDmapDir(sr.rdir, ndp->fromloc, vsmp) != SDEnone) |
349 |
|
break; |
318 |
– |
/* unintentional penetration? */ |
319 |
– |
if (DOT(sr.rdir, ndp->pr->ron) > 0 ^ vsmp[2] > 0) |
320 |
– |
continue; |
350 |
|
/* spawn a specular ray */ |
351 |
|
if (nstarget > 1) |
352 |
|
bsv.cieY /= (double)nstarget; |
353 |
< |
cvt_sdcolor(sr.rcoef, &bsv); /* use color */ |
354 |
< |
if (usepat) /* pattern on transmission */ |
353 |
> |
cvt_sdcolor(sr.rcoef, &bsv); /* use sample color */ |
354 |
> |
if (usepat) /* apply pattern? */ |
355 |
|
multcolor(sr.rcoef, ndp->pr->pcol); |
356 |
|
if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
357 |
< |
if (maxdepth > 0) |
357 |
> |
if (maxdepth > 0) |
358 |
|
break; |
359 |
< |
++nsent; /* Russian roulette victim */ |
331 |
< |
continue; |
359 |
> |
continue; /* Russian roulette victim */ |
360 |
|
} |
361 |
|
/* need to offset origin? */ |
362 |
|
if (ndp->thick != 0 && ndp->pr->rod > 0 ^ vsmp[2] > 0) |
364 |
|
rayvalue(&sr); /* send & evaluate sample */ |
365 |
|
multcolor(sr.rcol, sr.rcoef); |
366 |
|
addcolor(ndp->pr->rcol, sr.rcol); |
339 |
– |
++nsent; |
367 |
|
} |
368 |
|
return(nsent); |
369 |
|
} |
517 |
|
if (!ec) |
518 |
|
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, |
519 |
|
SDqueryMin+SDqueryMax, nd.sd); |
493 |
– |
nd.thru_psa = .0; |
494 |
– |
if (!ec && nd.thick != 0 && r->crtype & (SPECULAR|AMBIENT)) { |
495 |
– |
FVECT vthru; |
496 |
– |
vthru[0] = -nd.vray[0]; |
497 |
– |
vthru[1] = -nd.vray[1]; |
498 |
– |
vthru[2] = -nd.vray[2]; |
499 |
– |
ec = SDsizeBSDF(&nd.thru_psa, nd.vray, vthru, |
500 |
– |
SDqueryMin, nd.sd); |
501 |
– |
} |
520 |
|
if (ec) { |
521 |
|
objerror(m, WARNING, transSDError(ec)); |
522 |
|
SDfreeCache(nd.sd); |