| 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 |
|
|
| 205 |
|
VCOPY(rbf->invec, invec); |
| 206 |
|
} |
| 207 |
|
|
| 202 |
– |
/* Compute volume associated with Gaussian lobe */ |
| 203 |
– |
double |
| 204 |
– |
rbf_volume(const RBFVAL *rbfp) |
| 205 |
– |
{ |
| 206 |
– |
double rad = R2ANG(rbfp->crad); |
| 207 |
– |
|
| 208 |
– |
return((2.*M_PI) * rbfp->peak * rad*rad); |
| 209 |
– |
} |
| 210 |
– |
|
| 208 |
|
/* Compute outgoing vector from grid position */ |
| 209 |
|
void |
| 210 |
|
ovec_from_pos(FVECT vec, int xpos, int ypos) |
| 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 minval = bsdf_min*output_orient*outvec[2]; |
| 262 |
+ |
int pos[2]; |
| 263 |
|
double res = 0; |
| 264 |
|
const RBFVAL *rbfp; |
| 265 |
|
FVECT odir; |
| 266 |
< |
double sig2; |
| 266 |
> |
double rad2; |
| 267 |
|
int n; |
| 268 |
< |
|
| 269 |
< |
if (rp == NULL) |
| 268 |
> |
/* check for wrong side */ |
| 269 |
> |
if (outvec[2] > 0 ^ output_orient > 0) |
| 270 |
|
return(.0); |
| 271 |
+ |
/* use minimum if no information avail. */ |
| 272 |
+ |
if (rp == NULL) |
| 273 |
+ |
return(minval); |
| 274 |
+ |
/* optimization for fast lobe culling */ |
| 275 |
+ |
pos_from_vec(pos, outvec); |
| 276 |
+ |
/* sum radial basis function */ |
| 277 |
|
rbfp = rp->rbfa; |
| 278 |
|
for (n = rp->nrbf; n--; rbfp++) { |
| 279 |
+ |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) + |
| 280 |
+ |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy); |
| 281 |
+ |
rad2 = R2ANG(rbfp->crad); |
| 282 |
+ |
rad2 *= rad2; |
| 283 |
+ |
if (d2 > (38.*GRIDRES*GRIDRES/M_PI/M_PI)*rad2) |
| 284 |
+ |
continue; |
| 285 |
|
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
| 286 |
< |
sig2 = R2ANG(rbfp->crad); |
| 256 |
< |
sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
| 257 |
< |
if (sig2 > -19.) |
| 258 |
< |
res += rbfp->peak * exp(sig2); |
| 286 |
> |
res += rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2); |
| 287 |
|
} |
| 288 |
+ |
if (res < minval) /* never return less than minval */ |
| 289 |
+ |
return(minval); |
| 290 |
|
return(res); |
| 291 |
|
} |
| 292 |
|
|
| 420 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
| 421 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
| 422 |
|
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
| 423 |
+ |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
| 424 |
|
fputformat(BSDFREP_FMT, ofp); |
| 425 |
|
fputc('\n', ofp); |
| 426 |
|
/* write each DSF */ |
| 484 |
|
} |
| 485 |
|
if (!strncmp(s, "GRIDRES=", 8)) { |
| 486 |
|
sscanf(s+8, "%d", &grid_res); |
| 487 |
+ |
return(0); |
| 488 |
+ |
} |
| 489 |
+ |
if (!strncmp(s, "BSDFMIN=", 8)) { |
| 490 |
+ |
sscanf(s+8, "%lf", &bsdf_min); |
| 491 |
|
return(0); |
| 492 |
|
} |
| 493 |
|
if (formatval(fmt, s) && strcmp(fmt, BSDFREP_FMT)) |
