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. |
51 |
|
* Arguments for MAT_BSDF are: |
52 |
|
* 6+ thick BSDFfile ux uy uz funcfile transform |
53 |
|
* 0 |
54 |
< |
* 0|3|9 rdf gdf bdf |
54 |
> |
* 0|3|6|9 rdf gdf bdf |
55 |
|
* rdb gdb bdb |
56 |
|
* rdt gdt bdt |
57 |
|
*/ |
68 |
|
RAY *pr; /* intersected ray */ |
69 |
|
FVECT pnorm; /* perturbed surface normal */ |
70 |
|
FVECT vray; /* local outgoing (return) vector */ |
71 |
< |
double sr_vpsa; /* sqrt of BSDF projected solid angle */ |
71 |
> |
double sr_vpsa[2]; /* sqrt of BSDF projected solid angle extrema */ |
72 |
|
RREAL toloc[3][3]; /* world to local BSDF coords */ |
73 |
|
RREAL fromloc[3][3]; /* local BSDF coords to world */ |
74 |
|
double thick; /* surface thickness */ |
75 |
+ |
COLOR cthru; /* through component multiplier */ |
76 |
|
SDData *sd; /* loaded BSDF data */ |
77 |
< |
COLOR runsamp; /* BSDF hemispherical reflection */ |
78 |
< |
COLOR rdiff; /* added diffuse reflection */ |
77 |
< |
COLOR tunsamp; /* BSDF hemispherical transmission */ |
78 |
< |
COLOR tdiff; /* added diffuse transmission */ |
77 |
> |
COLOR rdiff; /* diffuse reflection */ |
78 |
> |
COLOR tdiff; /* diffuse transmission */ |
79 |
|
} BSDFDAT; /* BSDF material data */ |
80 |
|
|
81 |
|
#define cvt_sdcolor(cv, svp) ccy2rgb(&(svp)->spec, (svp)->cieY, cv) |
82 |
|
|
83 |
< |
/* Jitter ray sample according to projected solid angle and specjitter */ |
83 |
> |
/* Compute through component color */ |
84 |
|
static void |
85 |
< |
bsdf_jitter(FVECT vres, BSDFDAT *ndp) |
85 |
> |
compute_through(BSDFDAT *ndp) |
86 |
|
{ |
87 |
< |
double sr_psa = ndp->sr_vpsa; |
87 |
> |
#define NDIR2CHECK 13 |
88 |
> |
static const float dir2check[NDIR2CHECK][2] = { |
89 |
> |
{0, 0}, |
90 |
> |
{-0.8, 0}, |
91 |
> |
{0, 0.8}, |
92 |
> |
{0, -0.8}, |
93 |
> |
{0.8, 0}, |
94 |
> |
{-0.8, 0.8}, |
95 |
> |
{-0.8, -0.8}, |
96 |
> |
{0.8, 0.8}, |
97 |
> |
{0.8, -0.8}, |
98 |
> |
{-1.6, 0}, |
99 |
> |
{0, 1.6}, |
100 |
> |
{0, -1.6}, |
101 |
> |
{1.6, 0}, |
102 |
> |
}; |
103 |
> |
const double peak_over = 2.0; |
104 |
> |
SDSpectralDF *dfp; |
105 |
> |
FVECT pdir; |
106 |
> |
double tomega, srchrad; |
107 |
> |
COLOR vpeak, vsum; |
108 |
> |
int nsum, i; |
109 |
> |
SDError ec; |
110 |
|
|
111 |
+ |
setcolor(ndp->cthru, .0, .0, .0); /* starting assumption */ |
112 |
+ |
|
113 |
+ |
if (ndp->pr->rod > 0) |
114 |
+ |
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
115 |
+ |
else |
116 |
+ |
dfp = (ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf; |
117 |
+ |
|
118 |
+ |
if (dfp == NULL) |
119 |
+ |
return; /* no specular transmission */ |
120 |
+ |
if (bright(ndp->pr->pcol) <= FTINY) |
121 |
+ |
return; /* pattern is black, here */ |
122 |
+ |
srchrad = sqrt(dfp->minProjSA); /* else search for peak */ |
123 |
+ |
setcolor(vpeak, .0, .0, .0); |
124 |
+ |
setcolor(vsum, .0, .0, .0); |
125 |
+ |
nsum = 0; |
126 |
+ |
for (i = 0; i < NDIR2CHECK; i++) { |
127 |
+ |
FVECT tdir; |
128 |
+ |
SDValue sv; |
129 |
+ |
COLOR vcol; |
130 |
+ |
tdir[0] = -ndp->vray[0] + dir2check[i][0]*srchrad; |
131 |
+ |
tdir[1] = -ndp->vray[1] + dir2check[i][1]*srchrad; |
132 |
+ |
tdir[2] = -ndp->vray[2]; |
133 |
+ |
if (normalize(tdir) == 0) |
134 |
+ |
continue; |
135 |
+ |
ec = SDevalBSDF(&sv, tdir, ndp->vray, ndp->sd); |
136 |
+ |
if (ec) |
137 |
+ |
goto baderror; |
138 |
+ |
cvt_sdcolor(vcol, &sv); |
139 |
+ |
addcolor(vsum, vcol); |
140 |
+ |
++nsum; |
141 |
+ |
if (bright(vcol) > bright(vpeak)) { |
142 |
+ |
copycolor(vpeak, vcol); |
143 |
+ |
VCOPY(pdir, tdir); |
144 |
+ |
} |
145 |
+ |
} |
146 |
+ |
ec = SDsizeBSDF(&tomega, pdir, ndp->vray, SDqueryMin, ndp->sd); |
147 |
+ |
if (ec) |
148 |
+ |
goto baderror; |
149 |
+ |
if (tomega > 1.5*dfp->minProjSA) |
150 |
+ |
return; /* not really a peak? */ |
151 |
+ |
if ((bright(vpeak) - ndp->sd->tLamb.cieY*(1./PI))*tomega <= .001) |
152 |
+ |
return; /* < 0.1% transmission */ |
153 |
+ |
for (i = 3; i--; ) /* remove peak from average */ |
154 |
+ |
colval(vsum,i) -= colval(vpeak,i); |
155 |
+ |
--nsum; |
156 |
+ |
if (peak_over*bright(vsum) >= nsum*bright(vpeak)) |
157 |
+ |
return; /* not peaky enough */ |
158 |
+ |
copycolor(ndp->cthru, vpeak); /* else use it */ |
159 |
+ |
scalecolor(ndp->cthru, tomega); |
160 |
+ |
multcolor(ndp->cthru, ndp->pr->pcol); /* modify by pattern */ |
161 |
+ |
return; |
162 |
+ |
baderror: |
163 |
+ |
objerror(ndp->mp, USER, transSDError(ec)); |
164 |
+ |
#undef NDIR2CHECK |
165 |
+ |
} |
166 |
+ |
|
167 |
+ |
/* Jitter ray sample according to projected solid angle and specjitter */ |
168 |
+ |
static void |
169 |
+ |
bsdf_jitter(FVECT vres, BSDFDAT *ndp, double sr_psa) |
170 |
+ |
{ |
171 |
|
VCOPY(vres, ndp->vray); |
172 |
|
if (specjitter < 1.) |
173 |
|
sr_psa *= specjitter; |
178 |
|
normalize(vres); |
179 |
|
} |
180 |
|
|
181 |
+ |
/* Get BSDF specular for direct component, returning true if OK to proceed */ |
182 |
+ |
static int |
183 |
+ |
direct_specular_OK(COLOR cval, FVECT ldir, double omega, BSDFDAT *ndp) |
184 |
+ |
{ |
185 |
+ |
int nsamp, ok = 0; |
186 |
+ |
FVECT vsrc, vsmp, vjit; |
187 |
+ |
double tomega; |
188 |
+ |
double sf, tsr, sd[2]; |
189 |
+ |
COLOR csmp, cdiff; |
190 |
+ |
double diffY; |
191 |
+ |
SDValue sv; |
192 |
+ |
SDError ec; |
193 |
+ |
int i; |
194 |
+ |
/* transform source direction */ |
195 |
+ |
if (SDmapDir(vsrc, ndp->toloc, ldir) != SDEnone) |
196 |
+ |
return(0); |
197 |
+ |
/* will discount diffuse portion */ |
198 |
+ |
switch ((vsrc[2] > 0)<<1 | (ndp->vray[2] > 0)) { |
199 |
+ |
case 3: |
200 |
+ |
if (ndp->sd->rf == NULL) |
201 |
+ |
return(0); /* all diffuse */ |
202 |
+ |
sv = ndp->sd->rLambFront; |
203 |
+ |
break; |
204 |
+ |
case 0: |
205 |
+ |
if (ndp->sd->rb == NULL) |
206 |
+ |
return(0); /* all diffuse */ |
207 |
+ |
sv = ndp->sd->rLambBack; |
208 |
+ |
break; |
209 |
+ |
default: |
210 |
+ |
if ((ndp->sd->tf == NULL) & (ndp->sd->tb == NULL)) |
211 |
+ |
return(0); /* all diffuse */ |
212 |
+ |
sv = ndp->sd->tLamb; |
213 |
+ |
break; |
214 |
+ |
} |
215 |
+ |
if (sv.cieY > FTINY) { |
216 |
+ |
diffY = sv.cieY *= 1./PI; |
217 |
+ |
cvt_sdcolor(cdiff, &sv); |
218 |
+ |
} else { |
219 |
+ |
diffY = .0; |
220 |
+ |
setcolor(cdiff, .0, .0, .0); |
221 |
+ |
} |
222 |
+ |
/* assign number of samples */ |
223 |
+ |
ec = SDsizeBSDF(&tomega, ndp->vray, vsrc, SDqueryMin, ndp->sd); |
224 |
+ |
if (ec) |
225 |
+ |
goto baderror; |
226 |
+ |
/* check indirect over-counting */ |
227 |
+ |
if ((ndp->thick != 0 || bright(ndp->cthru) > FTINY) |
228 |
+ |
&& ndp->pr->crtype & (SPECULAR|AMBIENT) |
229 |
+ |
&& (vsrc[2] > 0) ^ (ndp->vray[2] > 0)) { |
230 |
+ |
double dx = vsrc[0] + ndp->vray[0]; |
231 |
+ |
double dy = vsrc[1] + ndp->vray[1]; |
232 |
+ |
if (dx*dx + dy*dy <= omega+tomega) |
233 |
+ |
return(0); |
234 |
+ |
} |
235 |
+ |
sf = specjitter * ndp->pr->rweight; |
236 |
+ |
if (tomega <= .0) |
237 |
+ |
nsamp = 1; |
238 |
+ |
else if (25.*tomega <= omega) |
239 |
+ |
nsamp = 100.*sf + .5; |
240 |
+ |
else |
241 |
+ |
nsamp = 4.*sf*omega/tomega + .5; |
242 |
+ |
nsamp += !nsamp; |
243 |
+ |
setcolor(cval, .0, .0, .0); /* sample our source area */ |
244 |
+ |
sf = sqrt(omega); |
245 |
+ |
tsr = sqrt(tomega); |
246 |
+ |
for (i = nsamp; i--; ) { |
247 |
+ |
VCOPY(vsmp, vsrc); /* jitter query directions */ |
248 |
+ |
if (nsamp > 1) { |
249 |
+ |
multisamp(sd, 2, (i + frandom())/(double)nsamp); |
250 |
+ |
vsmp[0] += (sd[0] - .5)*sf; |
251 |
+ |
vsmp[1] += (sd[1] - .5)*sf; |
252 |
+ |
if (normalize(vsmp) == 0) { |
253 |
+ |
--nsamp; |
254 |
+ |
continue; |
255 |
+ |
} |
256 |
+ |
} |
257 |
+ |
bsdf_jitter(vjit, ndp, tsr); |
258 |
+ |
/* compute BSDF */ |
259 |
+ |
ec = SDevalBSDF(&sv, vjit, vsmp, ndp->sd); |
260 |
+ |
if (ec) |
261 |
+ |
goto baderror; |
262 |
+ |
if (sv.cieY - diffY <= FTINY) { |
263 |
+ |
addcolor(cval, cdiff); |
264 |
+ |
continue; /* no specular part */ |
265 |
+ |
} |
266 |
+ |
cvt_sdcolor(csmp, &sv); |
267 |
+ |
addcolor(cval, csmp); /* else average it in */ |
268 |
+ |
++ok; |
269 |
+ |
} |
270 |
+ |
if (!ok) { |
271 |
+ |
setcolor(cval, .0, .0, .0); |
272 |
+ |
return(0); /* no valid specular samples */ |
273 |
+ |
} |
274 |
+ |
sf = 1./(double)nsamp; |
275 |
+ |
scalecolor(cval, sf); |
276 |
+ |
/* subtract diffuse contribution */ |
277 |
+ |
for (i = 3*(diffY > FTINY); i--; ) |
278 |
+ |
if ((colval(cval,i) -= colval(cdiff,i)) < .0) |
279 |
+ |
colval(cval,i) = .0; |
280 |
+ |
return(1); |
281 |
+ |
baderror: |
282 |
+ |
objerror(ndp->mp, USER, transSDError(ec)); |
283 |
+ |
return(0); /* gratis return */ |
284 |
+ |
} |
285 |
+ |
|
286 |
|
/* Compute source contribution for BSDF (reflected & transmitted) */ |
287 |
|
static void |
288 |
|
dir_bsdf( |
293 |
|
) |
294 |
|
{ |
295 |
|
BSDFDAT *np = (BSDFDAT *)nnp; |
109 |
– |
SDError ec; |
110 |
– |
SDValue sv; |
111 |
– |
FVECT vsrc; |
112 |
– |
FVECT vjit; |
296 |
|
double ldot; |
297 |
|
double dtmp; |
298 |
|
COLOR ctmp; |
303 |
|
if ((-FTINY <= ldot) & (ldot <= FTINY)) |
304 |
|
return; |
305 |
|
|
306 |
< |
if (ldot > .0 && bright(np->rdiff) > FTINY) { |
306 |
> |
if (ldot > 0 && bright(np->rdiff) > FTINY) { |
307 |
|
/* |
308 |
|
* Compute added diffuse reflected component. |
309 |
|
*/ |
312 |
|
scalecolor(ctmp, dtmp); |
313 |
|
addcolor(cval, ctmp); |
314 |
|
} |
315 |
< |
if (ldot < .0 && bright(np->tdiff) > FTINY) { |
315 |
> |
if (ldot < 0 && bright(np->tdiff) > FTINY) { |
316 |
|
/* |
317 |
|
* Compute added diffuse transmission. |
318 |
|
*/ |
321 |
|
scalecolor(ctmp, dtmp); |
322 |
|
addcolor(cval, ctmp); |
323 |
|
} |
324 |
+ |
if (ambRayInPmap(np->pr)) |
325 |
+ |
return; /* specular already in photon map */ |
326 |
|
/* |
327 |
< |
* Compute scattering coefficient using BSDF. |
327 |
> |
* Compute specular scattering coefficient using BSDF. |
328 |
|
*/ |
329 |
< |
if (SDmapDir(vsrc, np->toloc, ldir) != SDEnone) |
329 |
> |
if (!direct_specular_OK(ctmp, ldir, omega, np)) |
330 |
|
return; |
331 |
< |
bsdf_jitter(vjit, np); |
147 |
< |
ec = SDevalBSDF(&sv, vjit, vsrc, np->sd); |
148 |
< |
if (ec) |
149 |
< |
objerror(np->mp, USER, transSDError(ec)); |
150 |
< |
|
151 |
< |
if (sv.cieY <= FTINY) /* not worth using? */ |
152 |
< |
return; |
153 |
< |
cvt_sdcolor(ctmp, &sv); |
154 |
< |
if (ldot > .0) { /* pattern only diffuse reflection */ |
155 |
< |
COLOR ctmp1, ctmp2; |
156 |
< |
dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
157 |
< |
: np->sd->rLambBack.cieY; |
158 |
< |
dtmp /= PI * sv.cieY; /* diffuse fraction */ |
159 |
< |
copycolor(ctmp2, np->pr->pcol); |
160 |
< |
scalecolor(ctmp2, dtmp); |
161 |
< |
setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
162 |
< |
addcolor(ctmp1, ctmp2); |
163 |
< |
multcolor(ctmp, ctmp1); /* apply derated pattern */ |
164 |
< |
dtmp = ldot * omega; |
165 |
< |
} else { /* full pattern on transmission */ |
331 |
> |
if (ldot < 0) { /* pattern for specular transmission */ |
332 |
|
multcolor(ctmp, np->pr->pcol); |
333 |
|
dtmp = -ldot * omega; |
334 |
< |
} |
334 |
> |
} else |
335 |
> |
dtmp = ldot * omega; |
336 |
|
scalecolor(ctmp, dtmp); |
337 |
|
addcolor(cval, ctmp); |
338 |
|
} |
347 |
|
) |
348 |
|
{ |
349 |
|
BSDFDAT *np = (BSDFDAT *)nnp; |
183 |
– |
SDError ec; |
184 |
– |
SDValue sv; |
185 |
– |
FVECT vsrc; |
186 |
– |
FVECT vjit; |
350 |
|
double ldot; |
351 |
|
double dtmp; |
352 |
|
COLOR ctmp, ctmp1, ctmp2; |
367 |
|
scalecolor(ctmp, dtmp); |
368 |
|
addcolor(cval, ctmp); |
369 |
|
} |
370 |
+ |
if (ambRayInPmap(np->pr)) |
371 |
+ |
return; /* specular already in photon map */ |
372 |
|
/* |
373 |
< |
* Compute reflection coefficient using BSDF. |
373 |
> |
* Compute specular reflection coefficient using BSDF. |
374 |
|
*/ |
375 |
< |
if (SDmapDir(vsrc, np->toloc, ldir) != SDEnone) |
375 |
> |
if (!direct_specular_OK(ctmp, ldir, omega, np)) |
376 |
|
return; |
212 |
– |
bsdf_jitter(vjit, np); |
213 |
– |
ec = SDevalBSDF(&sv, vjit, vsrc, np->sd); |
214 |
– |
if (ec) |
215 |
– |
objerror(np->mp, USER, transSDError(ec)); |
216 |
– |
|
217 |
– |
if (sv.cieY <= FTINY) /* not worth using? */ |
218 |
– |
return; |
219 |
– |
cvt_sdcolor(ctmp, &sv); |
220 |
– |
/* pattern only diffuse reflection */ |
221 |
– |
dtmp = (np->pr->rod > .0) ? np->sd->rLambFront.cieY |
222 |
– |
: np->sd->rLambBack.cieY; |
223 |
– |
dtmp /= PI * sv.cieY; /* diffuse fraction */ |
224 |
– |
copycolor(ctmp2, np->pr->pcol); |
225 |
– |
scalecolor(ctmp2, dtmp); |
226 |
– |
setcolor(ctmp1, 1.-dtmp, 1.-dtmp, 1.-dtmp); |
227 |
– |
addcolor(ctmp1, ctmp2); |
228 |
– |
multcolor(ctmp, ctmp1); /* apply derated pattern */ |
377 |
|
dtmp = ldot * omega; |
378 |
|
scalecolor(ctmp, dtmp); |
379 |
|
addcolor(cval, ctmp); |
389 |
|
) |
390 |
|
{ |
391 |
|
BSDFDAT *np = (BSDFDAT *)nnp; |
244 |
– |
SDError ec; |
245 |
– |
SDValue sv; |
246 |
– |
FVECT vsrc; |
247 |
– |
FVECT vjit; |
392 |
|
double ldot; |
393 |
|
double dtmp; |
394 |
|
COLOR ctmp; |
409 |
|
scalecolor(ctmp, dtmp); |
410 |
|
addcolor(cval, ctmp); |
411 |
|
} |
412 |
+ |
if (ambRayInPmap(np->pr)) |
413 |
+ |
return; /* specular already in photon map */ |
414 |
|
/* |
415 |
< |
* Compute scattering coefficient using BSDF. |
415 |
> |
* Compute specular scattering coefficient using BSDF. |
416 |
|
*/ |
417 |
< |
if (SDmapDir(vsrc, np->toloc, ldir) != SDEnone) |
417 |
> |
if (!direct_specular_OK(ctmp, ldir, omega, np)) |
418 |
|
return; |
273 |
– |
bsdf_jitter(vjit, np); |
274 |
– |
ec = SDevalBSDF(&sv, vjit, vsrc, np->sd); |
275 |
– |
if (ec) |
276 |
– |
objerror(np->mp, USER, transSDError(ec)); |
277 |
– |
|
278 |
– |
if (sv.cieY <= FTINY) /* not worth using? */ |
279 |
– |
return; |
280 |
– |
cvt_sdcolor(ctmp, &sv); |
419 |
|
/* full pattern on transmission */ |
420 |
|
multcolor(ctmp, np->pr->pcol); |
421 |
|
dtmp = -ldot * omega; |
428 |
|
sample_sdcomp(BSDFDAT *ndp, SDComponent *dcp, int usepat) |
429 |
|
{ |
430 |
|
int nstarget = 1; |
431 |
< |
int nsent = 0; |
431 |
> |
int nsent; |
432 |
|
SDError ec; |
433 |
|
SDValue bsv; |
434 |
< |
double sthick; |
435 |
< |
FVECT vjit, vsmp; |
434 |
> |
double xrand; |
435 |
> |
FVECT vsmp; |
436 |
|
RAY sr; |
299 |
– |
int ntrials; |
437 |
|
/* multiple samples? */ |
438 |
|
if (specjitter > 1.5) { |
439 |
|
nstarget = specjitter*ndp->pr->rweight + .5; |
440 |
< |
if (nstarget < 1) |
304 |
< |
nstarget = 1; |
440 |
> |
nstarget += !nstarget; |
441 |
|
} |
442 |
< |
/* run through our trials */ |
443 |
< |
for (ntrials = 0; nsent < nstarget && ntrials < 9*nstarget; ntrials++) { |
444 |
< |
SDerrorDetail[0] = '\0'; |
445 |
< |
/* sample direction & coef. */ |
446 |
< |
bsdf_jitter(vjit, ndp); |
447 |
< |
ec = SDsampComponent(&bsv, vsmp, vjit, ntrials ? frandom() |
448 |
< |
: urand(ilhash(dimlist,ndims)+samplendx), dcp); |
442 |
> |
/* run through our samples */ |
443 |
> |
for (nsent = 0; nsent < nstarget; nsent++) { |
444 |
> |
if (nstarget == 1) { /* stratify random variable */ |
445 |
> |
xrand = urand(ilhash(dimlist,ndims)+samplendx); |
446 |
> |
if (specjitter < 1.) |
447 |
> |
xrand = .5 + specjitter*(xrand-.5); |
448 |
> |
} else { |
449 |
> |
xrand = (nsent + frandom())/(double)nstarget; |
450 |
> |
} |
451 |
> |
SDerrorDetail[0] = '\0'; /* sample direction & coef. */ |
452 |
> |
bsdf_jitter(vsmp, ndp, ndp->sr_vpsa[0]); |
453 |
> |
ec = SDsampComponent(&bsv, vsmp, xrand, dcp); |
454 |
|
if (ec) |
455 |
|
objerror(ndp->mp, USER, transSDError(ec)); |
456 |
< |
/* zero component? */ |
316 |
< |
if (bsv.cieY <= FTINY) |
456 |
> |
if (bsv.cieY <= FTINY) /* zero component? */ |
457 |
|
break; |
458 |
|
/* map vector to world */ |
459 |
|
if (SDmapDir(sr.rdir, ndp->fromloc, vsmp) != SDEnone) |
460 |
|
break; |
321 |
– |
/* unintentional penetration? */ |
322 |
– |
if (DOT(sr.rdir, ndp->pr->ron) > .0 ^ vsmp[2] > .0) |
323 |
– |
continue; |
461 |
|
/* spawn a specular ray */ |
462 |
|
if (nstarget > 1) |
463 |
|
bsv.cieY /= (double)nstarget; |
464 |
< |
cvt_sdcolor(sr.rcoef, &bsv); /* use color */ |
465 |
< |
if (usepat) /* pattern on transmission */ |
464 |
> |
cvt_sdcolor(sr.rcoef, &bsv); /* use sample color */ |
465 |
> |
if (usepat) /* apply pattern? */ |
466 |
|
multcolor(sr.rcoef, ndp->pr->pcol); |
467 |
|
if (rayorigin(&sr, SPECULAR, ndp->pr, sr.rcoef) < 0) { |
468 |
< |
if (maxdepth > 0) |
468 |
> |
if (maxdepth > 0) |
469 |
|
break; |
470 |
< |
++nsent; /* Russian roulette victim */ |
334 |
< |
continue; |
470 |
> |
continue; /* Russian roulette victim */ |
471 |
|
} |
472 |
|
/* need to offset origin? */ |
473 |
< |
if (ndp->thick != .0 && ndp->pr->rod > .0 ^ vsmp[2] > .0) |
473 |
> |
if (ndp->thick != 0 && (ndp->pr->rod > 0) ^ (vsmp[2] > 0)) |
474 |
|
VSUM(sr.rorg, sr.rorg, ndp->pr->ron, -ndp->thick); |
475 |
|
rayvalue(&sr); /* send & evaluate sample */ |
476 |
|
multcolor(sr.rcol, sr.rcoef); |
477 |
|
addcolor(ndp->pr->rcol, sr.rcol); |
342 |
– |
++nsent; |
478 |
|
} |
479 |
|
return(nsent); |
480 |
|
} |
488 |
|
COLORV *unsc; |
489 |
|
|
490 |
|
if (sflags == SDsampSpT) { |
491 |
< |
unsc = ndp->tunsamp; |
492 |
< |
dfp = ndp->sd->tf; |
493 |
< |
cvt_sdcolor(unsc, &ndp->sd->tLamb); |
491 |
> |
unsc = ndp->tdiff; |
492 |
> |
if (ndp->pr->rod > 0) |
493 |
> |
dfp = (ndp->sd->tf != NULL) ? ndp->sd->tf : ndp->sd->tb; |
494 |
> |
else |
495 |
> |
dfp = (ndp->sd->tb != NULL) ? ndp->sd->tb : ndp->sd->tf; |
496 |
|
} else /* sflags == SDsampSpR */ { |
497 |
< |
unsc = ndp->runsamp; |
498 |
< |
if (ndp->pr->rod > .0) { |
497 |
> |
unsc = ndp->rdiff; |
498 |
> |
if (ndp->pr->rod > 0) |
499 |
|
dfp = ndp->sd->rf; |
500 |
< |
cvt_sdcolor(unsc, &ndp->sd->rLambFront); |
364 |
< |
} else { |
500 |
> |
else |
501 |
|
dfp = ndp->sd->rb; |
366 |
– |
cvt_sdcolor(unsc, &ndp->sd->rLambBack); |
367 |
– |
} |
502 |
|
} |
369 |
– |
multcolor(unsc, ndp->pr->pcol); |
503 |
|
if (dfp == NULL) /* no specular component? */ |
504 |
|
return(0); |
505 |
|
/* below sampling threshold? */ |
508 |
|
FVECT vjit; |
509 |
|
double d; |
510 |
|
COLOR ctmp; |
511 |
< |
bsdf_jitter(vjit, ndp); |
511 |
> |
bsdf_jitter(vjit, ndp, ndp->sr_vpsa[1]); |
512 |
|
d = SDdirectHemi(vjit, sflags, ndp->sd); |
513 |
|
if (sflags == SDsampSpT) { |
514 |
|
copycolor(ctmp, ndp->pr->pcol); |
534 |
|
int |
535 |
|
m_bsdf(OBJREC *m, RAY *r) |
536 |
|
{ |
537 |
+ |
int hitfront; |
538 |
|
COLOR ctmp; |
539 |
|
SDError ec; |
540 |
|
FVECT upvec, vtmp; |
544 |
|
if ((m->oargs.nsargs < 6) | (m->oargs.nfargs > 9) | |
545 |
|
(m->oargs.nfargs % 3)) |
546 |
|
objerror(m, USER, "bad # arguments"); |
547 |
< |
|
547 |
> |
/* record surface struck */ |
548 |
> |
hitfront = (r->rod > 0); |
549 |
|
/* load cal file */ |
550 |
|
mf = getfunc(m, 5, 0x1d, 1); |
551 |
+ |
setfunc(m, r); |
552 |
|
/* get thickness */ |
553 |
|
nd.thick = evalue(mf->ep[0]); |
554 |
|
if ((-FTINY <= nd.thick) & (nd.thick <= FTINY)) |
555 |
|
nd.thick = .0; |
556 |
< |
/* check shadow */ |
557 |
< |
if (r->crtype & SHADOW) { |
558 |
< |
if (nd.thick != .0) |
559 |
< |
raytrans(r); /* pass-through */ |
424 |
< |
return(1); /* or shadow */ |
556 |
> |
/* check backface visibility */ |
557 |
> |
if (!hitfront & !backvis) { |
558 |
> |
raytrans(r); |
559 |
> |
return(1); |
560 |
|
} |
561 |
|
/* check other rays to pass */ |
562 |
< |
if (nd.thick != 0 && (!(r->crtype & (SPECULAR|AMBIENT)) || |
563 |
< |
nd.thick > .0 ^ r->rod > .0)) { |
562 |
> |
if (nd.thick != 0 && (r->crtype & SHADOW || |
563 |
> |
!(r->crtype & (SPECULAR|AMBIENT)) || |
564 |
> |
(nd.thick > 0) ^ hitfront)) { |
565 |
|
raytrans(r); /* hide our proxy */ |
566 |
|
return(1); |
567 |
|
} |
568 |
+ |
nd.mp = m; |
569 |
+ |
nd.pr = r; |
570 |
|
/* get BSDF data */ |
571 |
|
nd.sd = loadBSDF(m->oargs.sarg[1]); |
572 |
+ |
/* early shadow check */ |
573 |
+ |
if (r->crtype & SHADOW && (nd.sd->tf == NULL) & (nd.sd->tb == NULL)) |
574 |
+ |
return(1); |
575 |
|
/* diffuse reflectance */ |
576 |
< |
if (r->rod > .0) { |
577 |
< |
if (m->oargs.nfargs < 3) |
578 |
< |
setcolor(nd.rdiff, .0, .0, .0); |
579 |
< |
else |
439 |
< |
setcolor(nd.rdiff, m->oargs.farg[0], |
576 |
> |
if (hitfront) { |
577 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambFront); |
578 |
> |
if (m->oargs.nfargs >= 3) { |
579 |
> |
setcolor(ctmp, m->oargs.farg[0], |
580 |
|
m->oargs.farg[1], |
581 |
|
m->oargs.farg[2]); |
582 |
+ |
addcolor(nd.rdiff, ctmp); |
583 |
+ |
} |
584 |
|
} else { |
585 |
< |
if (m->oargs.nfargs < 6) { /* check invisible backside */ |
586 |
< |
if (!backvis && (nd.sd->rb == NULL) & |
587 |
< |
(nd.sd->tf == NULL)) { |
446 |
< |
SDfreeCache(nd.sd); |
447 |
< |
raytrans(r); |
448 |
< |
return(1); |
449 |
< |
} |
450 |
< |
setcolor(nd.rdiff, .0, .0, .0); |
451 |
< |
} else |
452 |
< |
setcolor(nd.rdiff, m->oargs.farg[3], |
585 |
> |
cvt_sdcolor(nd.rdiff, &nd.sd->rLambBack); |
586 |
> |
if (m->oargs.nfargs >= 6) { |
587 |
> |
setcolor(ctmp, m->oargs.farg[3], |
588 |
|
m->oargs.farg[4], |
589 |
|
m->oargs.farg[5]); |
590 |
+ |
addcolor(nd.rdiff, ctmp); |
591 |
+ |
} |
592 |
|
} |
593 |
|
/* diffuse transmittance */ |
594 |
< |
if (m->oargs.nfargs < 9) |
595 |
< |
setcolor(nd.tdiff, .0, .0, .0); |
596 |
< |
else |
460 |
< |
setcolor(nd.tdiff, m->oargs.farg[6], |
594 |
> |
cvt_sdcolor(nd.tdiff, &nd.sd->tLamb); |
595 |
> |
if (m->oargs.nfargs >= 9) { |
596 |
> |
setcolor(ctmp, m->oargs.farg[6], |
597 |
|
m->oargs.farg[7], |
598 |
|
m->oargs.farg[8]); |
599 |
< |
nd.mp = m; |
600 |
< |
nd.pr = r; |
599 |
> |
addcolor(nd.tdiff, ctmp); |
600 |
> |
} |
601 |
|
/* get modifiers */ |
602 |
|
raytexture(r, m->omod); |
603 |
|
/* modify diffuse values */ |
608 |
|
upvec[1] = evalue(mf->ep[2]); |
609 |
|
upvec[2] = evalue(mf->ep[3]); |
610 |
|
/* return to world coords */ |
611 |
< |
if (mf->f != &unitxf) { |
612 |
< |
multv3(upvec, upvec, mf->f->xfm); |
613 |
< |
nd.thick *= mf->f->sca; |
611 |
> |
if (mf->fxp != &unitxf) { |
612 |
> |
multv3(upvec, upvec, mf->fxp->xfm); |
613 |
> |
nd.thick *= mf->fxp->sca; |
614 |
|
} |
615 |
+ |
if (r->rox != NULL) { |
616 |
+ |
multv3(upvec, upvec, r->rox->f.xfm); |
617 |
+ |
nd.thick *= r->rox->f.sca; |
618 |
+ |
} |
619 |
|
raynormal(nd.pnorm, r); |
620 |
|
/* compute local BSDF xform */ |
621 |
|
ec = SDcompXform(nd.toloc, nd.pnorm, upvec); |
625 |
|
nd.vray[2] = -r->rdir[2]; |
626 |
|
ec = SDmapDir(nd.vray, nd.toloc, nd.vray); |
627 |
|
} |
628 |
< |
if (!ec) |
629 |
< |
ec = SDinvXform(nd.fromloc, nd.toloc); |
490 |
< |
/* determine BSDF resolution */ |
491 |
< |
if (!ec) |
492 |
< |
ec = SDsizeBSDF(&nd.sr_vpsa, nd.vray, SDqueryMin, nd.sd); |
493 |
< |
if (!ec) |
494 |
< |
nd.sr_vpsa = sqrt(nd.sr_vpsa); |
495 |
< |
else { |
496 |
< |
objerror(m, WARNING, transSDError(ec)); |
497 |
< |
SDfreeCache(nd.sd); |
628 |
> |
if (ec) { |
629 |
> |
objerror(m, WARNING, "Illegal orientation vector"); |
630 |
|
return(1); |
631 |
|
} |
632 |
< |
if (r->rod < .0) { /* perturb normal towards hit */ |
632 |
> |
compute_through(&nd); /* compute through component */ |
633 |
> |
if (r->crtype & SHADOW) { |
634 |
> |
RAY tr; /* attempt to pass shadow ray */ |
635 |
> |
if (rayorigin(&tr, TRANS, r, nd.cthru) < 0) |
636 |
> |
return(1); /* blocked */ |
637 |
> |
VCOPY(tr.rdir, r->rdir); |
638 |
> |
rayvalue(&tr); /* transmit with scaling */ |
639 |
> |
multcolor(tr.rcol, tr.rcoef); |
640 |
> |
copycolor(r->rcol, tr.rcol); |
641 |
> |
return(1); /* we're done */ |
642 |
> |
} |
643 |
> |
ec = SDinvXform(nd.fromloc, nd.toloc); |
644 |
> |
if (!ec) /* determine BSDF resolution */ |
645 |
> |
ec = SDsizeBSDF(nd.sr_vpsa, nd.vray, NULL, |
646 |
> |
SDqueryMin+SDqueryMax, nd.sd); |
647 |
> |
if (ec) |
648 |
> |
objerror(m, USER, transSDError(ec)); |
649 |
> |
|
650 |
> |
nd.sr_vpsa[0] = sqrt(nd.sr_vpsa[0]); |
651 |
> |
nd.sr_vpsa[1] = sqrt(nd.sr_vpsa[1]); |
652 |
> |
if (!hitfront) { /* perturb normal towards hit */ |
653 |
|
nd.pnorm[0] = -nd.pnorm[0]; |
654 |
|
nd.pnorm[1] = -nd.pnorm[1]; |
655 |
|
nd.pnorm[2] = -nd.pnorm[2]; |
659 |
|
/* sample transmission */ |
660 |
|
sample_sdf(&nd, SDsampSpT); |
661 |
|
/* compute indirect diffuse */ |
662 |
< |
copycolor(ctmp, nd.rdiff); |
663 |
< |
addcolor(ctmp, nd.runsamp); |
512 |
< |
if (bright(ctmp) > FTINY) { /* ambient from reflection */ |
513 |
< |
if (r->rod < .0) |
662 |
> |
if (bright(nd.rdiff) > FTINY) { /* ambient from reflection */ |
663 |
> |
if (!hitfront) |
664 |
|
flipsurface(r); |
665 |
+ |
copycolor(ctmp, nd.rdiff); |
666 |
|
multambient(ctmp, r, nd.pnorm); |
667 |
|
addcolor(r->rcol, ctmp); |
668 |
< |
if (r->rod < .0) |
668 |
> |
if (!hitfront) |
669 |
|
flipsurface(r); |
670 |
|
} |
671 |
< |
copycolor(ctmp, nd.tdiff); |
521 |
< |
addcolor(ctmp, nd.tunsamp); |
522 |
< |
if (bright(ctmp) > FTINY) { /* ambient from other side */ |
671 |
> |
if (bright(nd.tdiff) > FTINY) { /* ambient from other side */ |
672 |
|
FVECT bnorm; |
673 |
< |
if (r->rod > .0) |
673 |
> |
if (hitfront) |
674 |
|
flipsurface(r); |
675 |
|
bnorm[0] = -nd.pnorm[0]; |
676 |
|
bnorm[1] = -nd.pnorm[1]; |
677 |
|
bnorm[2] = -nd.pnorm[2]; |
678 |
< |
if (nd.thick != .0) { /* proxy with offset? */ |
678 |
> |
copycolor(ctmp, nd.tdiff); |
679 |
> |
if (nd.thick != 0) { /* proxy with offset? */ |
680 |
|
VCOPY(vtmp, r->rop); |
681 |
< |
VSUM(r->rop, vtmp, r->ron, -nd.thick); |
681 |
> |
VSUM(r->rop, vtmp, r->ron, nd.thick); |
682 |
|
multambient(ctmp, r, bnorm); |
683 |
|
VCOPY(r->rop, vtmp); |
684 |
|
} else |
685 |
|
multambient(ctmp, r, bnorm); |
686 |
|
addcolor(r->rcol, ctmp); |
687 |
< |
if (r->rod > .0) |
687 |
> |
if (hitfront) |
688 |
|
flipsurface(r); |
689 |
|
} |
690 |
|
/* add direct component */ |
691 |
< |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL)) { |
691 |
> |
if ((bright(nd.tdiff) <= FTINY) & (nd.sd->tf == NULL) & |
692 |
> |
(nd.sd->tb == NULL)) { |
693 |
|
direct(r, dir_brdf, &nd); /* reflection only */ |
694 |
< |
} else if (nd.thick == .0) { |
694 |
> |
} else if (nd.thick == 0) { |
695 |
|
direct(r, dir_bsdf, &nd); /* thin surface scattering */ |
696 |
|
} else { |
697 |
|
direct(r, dir_brdf, &nd); /* reflection first */ |
698 |
|
VCOPY(vtmp, r->rop); /* offset for transmitted */ |
699 |
|
VSUM(r->rop, vtmp, r->ron, -nd.thick); |
700 |
< |
direct(r, dir_btdf, &nd); |
700 |
> |
direct(r, dir_btdf, &nd); /* separate transmission */ |
701 |
|
VCOPY(r->rop, vtmp); |
702 |
|
} |
703 |
|
/* clean up */ |