| 71 |
|
{ |
| 72 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 73 |
|
int li; |
| 74 |
< |
double alt, azi, d; |
| 74 |
> |
double pol, azi, d; |
| 75 |
|
|
| 76 |
|
if ((ndx < 0) | (ndx >= ab->nangles)) |
| 77 |
|
return(0); |
| 78 |
|
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
| 79 |
|
ndx -= ab->lat[li].nphis; |
| 80 |
< |
alt = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
| 80 |
> |
pol = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
| 81 |
|
azi = 2.*PI*ndx/ab->lat[li].nphis; |
| 82 |
< |
v[2] = d = cos(alt); |
| 83 |
< |
d = sqrt(1. - d*d); /* sin(alt) */ |
| 82 |
> |
v[2] = d = cos(pol); |
| 83 |
> |
d = sqrt(1. - d*d); /* sin(pol) */ |
| 84 |
|
v[0] = cos(azi)*d; |
| 85 |
|
v[1] = sin(azi)*d; |
| 86 |
|
return(1); |
| 95 |
|
{ |
| 96 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 97 |
|
int li, ndx; |
| 98 |
< |
double alt, azi, d; |
| 98 |
> |
double pol, azi, d; |
| 99 |
|
|
| 100 |
|
if ((v[2] < -1.0) | (v[2] > 1.0)) |
| 101 |
|
return(-1); |
| 102 |
< |
alt = 180.0/PI*acos(v[2]); |
| 102 |
> |
pol = 180.0/PI*acos(v[2]); |
| 103 |
|
azi = 180.0/PI*atan2(v[1], v[0]); |
| 104 |
|
if (azi < 0.0) azi += 360.0; |
| 105 |
< |
for (li = 1; ab->lat[li].tmin <= alt; li++) |
| 105 |
> |
for (li = 1; ab->lat[li].tmin <= pol; li++) |
| 106 |
|
if (!ab->lat[li].nphis) |
| 107 |
|
return(-1); |
| 108 |
|
--li; |
| 254 |
|
struct BSDF_data *dp |
| 255 |
|
) |
| 256 |
|
{ |
| 257 |
< |
double * omega_arr; |
| 258 |
< |
double dom, hemi_total; |
| 257 |
> |
double *omega_iarr, *omega_oarr; |
| 258 |
> |
double dom, contrib, hemi_total; |
| 259 |
|
int nneg; |
| 260 |
+ |
FVECT v; |
| 261 |
|
int i, o; |
| 262 |
|
|
| 263 |
|
if (dp == NULL || dp->bsdf == NULL) |
| 264 |
|
return(0); |
| 265 |
< |
omega_arr = (double *)calloc(dp->nout, sizeof(double)); |
| 266 |
< |
if (omega_arr == NULL) |
| 265 |
> |
omega_iarr = (double *)calloc(dp->ninc, sizeof(double)); |
| 266 |
> |
omega_oarr = (double *)calloc(dp->nout, sizeof(double)); |
| 267 |
> |
if ((omega_iarr == NULL) | (omega_oarr == NULL)) |
| 268 |
|
error(SYSTEM, "out of memory in check_bsdf_data"); |
| 269 |
+ |
/* incoming projected solid angles */ |
| 270 |
|
hemi_total = .0; |
| 271 |
+ |
for (i = dp->ninc; i--; ) { |
| 272 |
+ |
dom = getBSDF_incohm(dp,i); |
| 273 |
+ |
if (dom <= .0) { |
| 274 |
+ |
error(WARNING, "zero/negative incoming solid angle"); |
| 275 |
+ |
continue; |
| 276 |
+ |
} |
| 277 |
+ |
if (!getBSDF_incvec(v,dp,i) || v[2] > FTINY) { |
| 278 |
+ |
error(WARNING, "illegal incoming BSDF direction"); |
| 279 |
+ |
free(omega_iarr); free(omega_oarr); |
| 280 |
+ |
return(0); |
| 281 |
+ |
} |
| 282 |
+ |
hemi_total += omega_iarr[i] = dom * -v[2]; |
| 283 |
+ |
} |
| 284 |
+ |
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
| 285 |
+ |
sprintf(errmsg, "incoming BSDF hemisphere off by %.1f%%", |
| 286 |
+ |
100.*(hemi_total/PI - 1.)); |
| 287 |
+ |
error(WARNING, errmsg); |
| 288 |
+ |
} |
| 289 |
+ |
dom = PI / hemi_total; /* fix normalization */ |
| 290 |
+ |
for (i = dp->ninc; i--; ) |
| 291 |
+ |
omega_iarr[i] *= dom; |
| 292 |
+ |
/* outgoing projected solid angles */ |
| 293 |
+ |
hemi_total = .0; |
| 294 |
|
for (o = dp->nout; o--; ) { |
| 269 |
– |
FVECT v; |
| 295 |
|
dom = getBSDF_outohm(dp,o); |
| 296 |
|
if (dom <= .0) { |
| 297 |
< |
error(WARNING, "zero/negative solid angle"); |
| 297 |
> |
error(WARNING, "zero/negative outgoing solid angle"); |
| 298 |
|
continue; |
| 299 |
|
} |
| 300 |
|
if (!getBSDF_outvec(v,dp,o) || v[2] < -FTINY) { |
| 301 |
|
error(WARNING, "illegal outgoing BSDF direction"); |
| 302 |
< |
free(omega_arr); |
| 302 |
> |
free(omega_iarr); free(omega_oarr); |
| 303 |
|
return(0); |
| 304 |
|
} |
| 305 |
< |
hemi_total += omega_arr[o] = dom*v[2]; |
| 305 |
> |
hemi_total += omega_oarr[o] = dom * v[2]; |
| 306 |
|
} |
| 307 |
|
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
| 308 |
|
sprintf(errmsg, "outgoing BSDF hemisphere off by %.1f%%", |
| 309 |
|
100.*(hemi_total/PI - 1.)); |
| 310 |
|
error(WARNING, errmsg); |
| 311 |
|
} |
| 312 |
< |
dom = PI / hemi_total; /* normalize solid angles */ |
| 312 |
> |
dom = PI / hemi_total; /* fix normalization */ |
| 313 |
|
for (o = dp->nout; o--; ) |
| 314 |
< |
omega_arr[o] *= dom; |
| 315 |
< |
nneg = 0; |
| 316 |
< |
for (i = dp->ninc; i--; ) { |
| 314 |
> |
omega_oarr[o] *= dom; |
| 315 |
> |
nneg = 0; /* check outgoing totals */ |
| 316 |
> |
for (i = 0; i < dp->ninc; i++) { |
| 317 |
|
hemi_total = .0; |
| 318 |
|
for (o = dp->nout; o--; ) { |
| 319 |
|
double f = BSDF_value(dp,i,o); |
| 320 |
< |
if (f > .0) |
| 321 |
< |
hemi_total += f*omega_arr[o]; |
| 322 |
< |
else if (f < -FTINY) |
| 323 |
< |
++nneg; |
| 320 |
> |
if (f >= .0) |
| 321 |
> |
hemi_total += f*omega_oarr[o]; |
| 322 |
> |
else { |
| 323 |
> |
nneg += (f < -FTINY); |
| 324 |
> |
BSDF_value(dp,i,o) = .0f; |
| 325 |
> |
} |
| 326 |
|
} |
| 327 |
|
if (hemi_total > 1.02) { |
| 328 |
< |
sprintf(errmsg, "BSDF direction passes %.1f%% of light", |
| 329 |
< |
100.*hemi_total); |
| 328 |
> |
sprintf(errmsg, |
| 329 |
> |
"incoming BSDF direction %d passes %.1f%% of light", |
| 330 |
> |
i, 100.*hemi_total); |
| 331 |
|
error(WARNING, errmsg); |
| 332 |
|
} |
| 333 |
|
} |
| 334 |
< |
free(omega_arr); |
| 335 |
< |
if (nneg > 0) { |
| 308 |
< |
sprintf(errmsg, "%d negative BSDF values", nneg); |
| 334 |
> |
if (nneg) { |
| 335 |
> |
sprintf(errmsg, "%d negative BSDF values (ignored)", nneg); |
| 336 |
|
error(WARNING, errmsg); |
| 310 |
– |
return(0); |
| 337 |
|
} |
| 338 |
+ |
/* reverse roles and check again */ |
| 339 |
+ |
for (o = 0; o < dp->nout; o++) { |
| 340 |
+ |
hemi_total = .0; |
| 341 |
+ |
for (i = dp->ninc; i--; ) |
| 342 |
+ |
hemi_total += BSDF_value(dp,i,o) * omega_iarr[i]; |
| 343 |
+ |
|
| 344 |
+ |
if (hemi_total > 1.02) { |
| 345 |
+ |
sprintf(errmsg, |
| 346 |
+ |
"outgoing BSDF direction %d collects %.1f%% of light", |
| 347 |
+ |
o, 100.*hemi_total); |
| 348 |
+ |
error(WARNING, errmsg); |
| 349 |
+ |
} |
| 350 |
+ |
} |
| 351 |
+ |
free(omega_iarr); free(omega_oarr); |
| 352 |
|
return(1); |
| 353 |
|
} |
| 354 |
|
|
