26 |
|
int input_orient = 0; |
27 |
|
int output_orient = 0; |
28 |
|
|
29 |
+ |
/* BSDF histogram */ |
30 |
+ |
unsigned long bsdf_hist[HISTLEN]; |
31 |
+ |
|
32 |
+ |
/* BSDF value for boundary regions */ |
33 |
+ |
double bsdf_min = 0; |
34 |
+ |
|
35 |
|
/* processed incident DSF measurements */ |
36 |
|
RBFNODE *dsf_list = NULL; |
37 |
|
|
88 |
|
int |
89 |
|
use_symmetry(FVECT vec) |
90 |
|
{ |
91 |
< |
double phi = get_phi360(vec); |
91 |
> |
const double phi = get_phi360(vec); |
92 |
|
|
93 |
|
switch (inp_coverage) { |
94 |
|
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4: |
194 |
|
FVECT outvec; |
195 |
|
int pos[2]; |
196 |
|
int n; |
197 |
< |
#ifdef DEBUG |
198 |
< |
double tdiff = 180./M_PI*fabs(acos(invec[2])-acos(rbf->invec[2])); |
193 |
< |
if (tdiff >= 1.5) |
194 |
< |
fprintf(stderr, |
195 |
< |
"%s: Warning - rotated theta differs by %.1f degrees\n", |
196 |
< |
progname, tdiff); |
197 |
< |
#endif |
198 |
< |
for (n = rbf->nrbf; n-- > 0; ) { |
197 |
> |
|
198 |
> |
for (n = ((-.01 > phi) | (phi > .01))*rbf->nrbf; n-- > 0; ) { |
199 |
|
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy); |
200 |
|
spinvector(outvec, outvec, vnorm, phi); |
201 |
|
pos_from_vec(pos, outvec); |
205 |
|
VCOPY(rbf->invec, invec); |
206 |
|
} |
207 |
|
|
208 |
– |
/* Compute volume associated with Gaussian lobe */ |
209 |
– |
double |
210 |
– |
rbf_volume(const RBFVAL *rbfp) |
211 |
– |
{ |
212 |
– |
double rad = R2ANG(rbfp->crad); |
213 |
– |
|
214 |
– |
return((2.*M_PI) * rbfp->peak * rad*rad); |
215 |
– |
} |
216 |
– |
|
208 |
|
/* Compute outgoing vector from grid position */ |
209 |
|
void |
210 |
|
ovec_from_pos(FVECT vec, int xpos, int ypos) |
212 |
|
double uv[2]; |
213 |
|
double r2; |
214 |
|
|
215 |
< |
SDsquare2disk(uv, (1./grid_res)*(xpos+.5), (1./grid_res)*(ypos+.5)); |
215 |
> |
SDsquare2disk(uv, (xpos+.5)/grid_res, (ypos+.5)/grid_res); |
216 |
|
/* uniform hemispherical projection */ |
217 |
|
r2 = uv[0]*uv[0] + uv[1]*uv[1]; |
218 |
|
vec[0] = vec[1] = sqrt(2. - r2); |
234 |
|
pos[1] = (int)(sq[1]*grid_res); |
235 |
|
} |
236 |
|
|
237 |
+ |
/* Compute volume associated with Gaussian lobe */ |
238 |
+ |
double |
239 |
+ |
rbf_volume(const RBFVAL *rbfp) |
240 |
+ |
{ |
241 |
+ |
double rad = R2ANG(rbfp->crad); |
242 |
+ |
FVECT odir; |
243 |
+ |
double elev, integ; |
244 |
+ |
/* infinite integral approximation */ |
245 |
+ |
integ = (2.*M_PI) * rbfp->peak * rad*rad; |
246 |
+ |
/* check if we're near horizon */ |
247 |
+ |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
248 |
+ |
elev = output_orient*odir[2]; |
249 |
+ |
/* apply cut-off correction if > 1% */ |
250 |
+ |
if (elev < 2.8*rad) { |
251 |
+ |
/* elev = asin(elev); /* this is so crude, anyway... */ |
252 |
+ |
integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad)); |
253 |
+ |
} |
254 |
+ |
return(integ); |
255 |
+ |
} |
256 |
+ |
|
257 |
|
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
258 |
|
double |
259 |
|
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
260 |
|
{ |
261 |
< |
double res = .0; |
261 |
> |
const double rfact2 = (38./M_PI/M_PI)*(grid_res*grid_res); |
262 |
> |
double minval = bsdf_min*output_orient*outvec[2]; |
263 |
> |
int pos[2]; |
264 |
> |
double res = 0; |
265 |
|
const RBFVAL *rbfp; |
266 |
|
FVECT odir; |
267 |
< |
double sig2; |
267 |
> |
double rad2; |
268 |
|
int n; |
269 |
< |
|
270 |
< |
if (rp == NULL) |
269 |
> |
/* check for wrong side */ |
270 |
> |
if (outvec[2] > 0 ^ output_orient > 0) |
271 |
|
return(.0); |
272 |
+ |
/* use minimum if no information avail. */ |
273 |
+ |
if (rp == NULL) |
274 |
+ |
return(minval); |
275 |
+ |
/* optimization for fast lobe culling */ |
276 |
+ |
pos_from_vec(pos, outvec); |
277 |
+ |
/* sum radial basis function */ |
278 |
|
rbfp = rp->rbfa; |
279 |
|
for (n = rp->nrbf; n--; rbfp++) { |
280 |
+ |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) + |
281 |
+ |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy); |
282 |
+ |
rad2 = R2ANG(rbfp->crad); |
283 |
+ |
rad2 *= rad2; |
284 |
+ |
if (d2 > rad2*rfact2) |
285 |
+ |
continue; |
286 |
|
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
287 |
< |
sig2 = R2ANG(rbfp->crad); |
262 |
< |
sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
263 |
< |
if (sig2 > -19.) |
264 |
< |
res += rbfp->peak * exp(sig2); |
287 |
> |
res += rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2); |
288 |
|
} |
289 |
+ |
if (res < minval) /* never return less than minval */ |
290 |
+ |
return(minval); |
291 |
|
return(res); |
292 |
|
} |
293 |
|
|
421 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
422 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
423 |
|
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
424 |
+ |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
425 |
|
fputformat(BSDFREP_FMT, ofp); |
426 |
|
fputc('\n', ofp); |
427 |
|
/* write each DSF */ |
487 |
|
sscanf(s+8, "%d", &grid_res); |
488 |
|
return(0); |
489 |
|
} |
490 |
+ |
if (!strncmp(s, "BSDFMIN=", 8)) { |
491 |
+ |
sscanf(s+8, "%lf", &bsdf_min); |
492 |
+ |
return(0); |
493 |
+ |
} |
494 |
|
if (formatval(fmt, s) && strcmp(fmt, BSDFREP_FMT)) |
495 |
|
return(-1); |
496 |
|
return(0); |
521 |
|
rbfh.invec[0] = getflt(ifp); |
522 |
|
rbfh.invec[1] = getflt(ifp); |
523 |
|
rbfh.invec[2] = getflt(ifp); |
524 |
+ |
if (normalize(rbfh.invec) == 0) { |
525 |
+ |
fprintf(stderr, "%s: zero incident vector\n", progname); |
526 |
+ |
return(0); |
527 |
+ |
} |
528 |
|
rbfh.vtotal = getflt(ifp); |
529 |
|
rbfh.nrbf = getint(4, ifp); |
530 |
|
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) + |
531 |
|
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
532 |
|
if (newrbf == NULL) |
533 |
|
goto memerr; |
534 |
< |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)); |
534 |
> |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)-sizeof(RBFVAL)); |
535 |
|
for (i = 0; i < rbfh.nrbf; i++) { |
536 |
|
newrbf->rbfa[i].peak = getflt(ifp); |
537 |
|
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |