23 |
|
} lat[MAXLATS+1]; /* latitudes */ |
24 |
|
} ANGLE_BASIS; |
25 |
|
|
26 |
< |
#define MAXABASES 3 /* limit on defined bases */ |
26 |
> |
#define MAXABASES 5 /* limit on defined bases */ |
27 |
|
|
28 |
|
static ANGLE_BASIS abase_list[MAXABASES] = { |
29 |
|
{ |
61 |
|
|
62 |
|
static int nabases = 3; /* current number of defined bases */ |
63 |
|
|
64 |
+ |
#define FEQ(a,b) ((a)-(b) <= 1e-7 && (b)-(a) <= 1e-7) |
65 |
|
|
66 |
+ |
// returns the name of the given tag |
67 |
+ |
#ifdef ezxml_name |
68 |
+ |
#undef ezxml_name |
69 |
+ |
static char * |
70 |
+ |
ezxml_name(ezxml_t xml) |
71 |
+ |
{ |
72 |
+ |
if (xml == NULL) |
73 |
+ |
return(NULL); |
74 |
+ |
return(xml->name); |
75 |
+ |
} |
76 |
+ |
#endif |
77 |
+ |
|
78 |
+ |
// returns the given tag's character content or empty string if none |
79 |
+ |
#ifdef ezxml_txt |
80 |
+ |
#undef ezxml_txt |
81 |
+ |
static char * |
82 |
+ |
ezxml_txt(ezxml_t xml) |
83 |
+ |
{ |
84 |
+ |
if (xml == NULL) |
85 |
+ |
return(""); |
86 |
+ |
return(xml->txt); |
87 |
+ |
} |
88 |
+ |
#endif |
89 |
+ |
|
90 |
+ |
|
91 |
|
static int |
92 |
|
ab_getvec( /* get vector for this angle basis index */ |
93 |
|
FVECT v, |
97 |
|
{ |
98 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
99 |
|
int li; |
100 |
< |
double alt, azi, d; |
100 |
> |
double pol, azi, d; |
101 |
|
|
102 |
|
if ((ndx < 0) | (ndx >= ab->nangles)) |
103 |
|
return(0); |
104 |
|
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
105 |
|
ndx -= ab->lat[li].nphis; |
106 |
< |
alt = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
106 |
> |
pol = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
107 |
|
azi = 2.*PI*ndx/ab->lat[li].nphis; |
108 |
< |
v[2] = d = cos(alt); |
109 |
< |
d = sqrt(1. - d*d); /* sin(alt) */ |
108 |
> |
v[2] = d = cos(pol); |
109 |
> |
d = sqrt(1. - d*d); /* sin(pol) */ |
110 |
|
v[0] = cos(azi)*d; |
111 |
|
v[1] = sin(azi)*d; |
112 |
|
return(1); |
121 |
|
{ |
122 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
123 |
|
int li, ndx; |
124 |
< |
double alt, azi, d; |
124 |
> |
double pol, azi, d; |
125 |
|
|
126 |
|
if ((v[2] < -1.0) | (v[2] > 1.0)) |
127 |
|
return(-1); |
128 |
< |
alt = 180.0/PI*acos(v[2]); |
128 |
> |
pol = 180.0/PI*acos(v[2]); |
129 |
|
azi = 180.0/PI*atan2(v[1], v[0]); |
130 |
|
if (azi < 0.0) azi += 360.0; |
131 |
< |
for (li = 1; ab->lat[li].tmin <= alt; li++) |
131 |
> |
for (li = 1; ab->lat[li].tmin <= pol; li++) |
132 |
|
if (!ab->lat[li].nphis) |
133 |
|
return(-1); |
134 |
|
--li; |
200 |
|
|
201 |
|
|
202 |
|
static void |
203 |
+ |
load_angle_basis( /* load BSDF angle basis */ |
204 |
+ |
ezxml_t wab |
205 |
+ |
) |
206 |
+ |
{ |
207 |
+ |
char *abname = ezxml_txt(ezxml_child(wab, "AngleBasisName")); |
208 |
+ |
ezxml_t wbb; |
209 |
+ |
int i; |
210 |
+ |
|
211 |
+ |
if (abname == NULL || !*abname) |
212 |
+ |
return; |
213 |
+ |
for (i = nabases; i--; ) |
214 |
+ |
if (!strcmp(abname, abase_list[i].name)) |
215 |
+ |
return; /* XXX assume it's the same */ |
216 |
+ |
if (nabases >= MAXABASES) |
217 |
+ |
error(INTERNAL, "too many angle bases"); |
218 |
+ |
strcpy(abase_list[nabases].name, abname); |
219 |
+ |
abase_list[nabases].nangles = 0; |
220 |
+ |
for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock"); |
221 |
+ |
wbb != NULL; i++, wbb = wbb->next) { |
222 |
+ |
if (i >= MAXLATS) |
223 |
+ |
error(INTERNAL, "too many latitudes in custom basis"); |
224 |
+ |
abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt( |
225 |
+ |
ezxml_child(ezxml_child(wbb, |
226 |
+ |
"ThetaBounds"), "UpperTheta"))); |
227 |
+ |
if (!i) |
228 |
+ |
abase_list[nabases].lat[i].tmin = |
229 |
+ |
-abase_list[nabases].lat[i+1].tmin; |
230 |
+ |
else if (!FEQ(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, |
231 |
+ |
"ThetaBounds"), "LowerTheta"))), |
232 |
+ |
abase_list[nabases].lat[i].tmin)) |
233 |
+ |
error(WARNING, "theta values disagree in custom basis"); |
234 |
+ |
abase_list[nabases].nangles += |
235 |
+ |
abase_list[nabases].lat[i].nphis = |
236 |
+ |
atoi(ezxml_txt(ezxml_child(wbb, "nPhis"))); |
237 |
+ |
} |
238 |
+ |
abase_list[nabases++].lat[i].nphis = 0; |
239 |
+ |
} |
240 |
+ |
|
241 |
+ |
|
242 |
+ |
static void |
243 |
|
load_bsdf_data( /* load BSDF distribution for this wavelength */ |
244 |
|
struct BSDF_data *dp, |
245 |
|
ezxml_t wdb |
250 |
|
char *sdata; |
251 |
|
int i; |
252 |
|
|
253 |
< |
if ((cbasis == NULL) | (rbasis == NULL)) { |
253 |
> |
if ((cbasis == NULL || !*cbasis) | (rbasis == NULL || !*rbasis)) { |
254 |
|
error(WARNING, "missing column/row basis for BSDF"); |
255 |
|
return; |
256 |
|
} |
285 |
|
} |
286 |
|
/* read BSDF data */ |
287 |
|
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData")); |
288 |
< |
if (sdata == NULL) { |
288 |
> |
if (sdata == NULL || !*sdata) { |
289 |
|
error(WARNING, "missing BSDF ScatteringData"); |
290 |
|
return; |
291 |
|
} |
320 |
|
struct BSDF_data *dp |
321 |
|
) |
322 |
|
{ |
323 |
< |
double * omega_arr; |
324 |
< |
double dom, hemi_total; |
323 |
> |
double *omega_iarr, *omega_oarr; |
324 |
> |
double dom, contrib, hemi_total; |
325 |
|
int nneg; |
326 |
+ |
FVECT v; |
327 |
|
int i, o; |
328 |
|
|
329 |
|
if (dp == NULL || dp->bsdf == NULL) |
330 |
|
return(0); |
331 |
< |
omega_arr = (double *)calloc(dp->nout, sizeof(double)); |
332 |
< |
if (omega_arr == NULL) |
331 |
> |
omega_iarr = (double *)calloc(dp->ninc, sizeof(double)); |
332 |
> |
omega_oarr = (double *)calloc(dp->nout, sizeof(double)); |
333 |
> |
if ((omega_iarr == NULL) | (omega_oarr == NULL)) |
334 |
|
error(SYSTEM, "out of memory in check_bsdf_data"); |
335 |
+ |
/* incoming projected solid angles */ |
336 |
|
hemi_total = .0; |
337 |
+ |
for (i = dp->ninc; i--; ) { |
338 |
+ |
dom = getBSDF_incohm(dp,i); |
339 |
+ |
if (dom <= .0) { |
340 |
+ |
error(WARNING, "zero/negative incoming solid angle"); |
341 |
+ |
continue; |
342 |
+ |
} |
343 |
+ |
if (!getBSDF_incvec(v,dp,i) || v[2] > FTINY) { |
344 |
+ |
error(WARNING, "illegal incoming BSDF direction"); |
345 |
+ |
free(omega_iarr); free(omega_oarr); |
346 |
+ |
return(0); |
347 |
+ |
} |
348 |
+ |
hemi_total += omega_iarr[i] = dom * -v[2]; |
349 |
+ |
} |
350 |
+ |
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
351 |
+ |
sprintf(errmsg, "incoming BSDF hemisphere off by %.1f%%", |
352 |
+ |
100.*(hemi_total/PI - 1.)); |
353 |
+ |
error(WARNING, errmsg); |
354 |
+ |
} |
355 |
+ |
dom = PI / hemi_total; /* fix normalization */ |
356 |
+ |
for (i = dp->ninc; i--; ) |
357 |
+ |
omega_iarr[i] *= dom; |
358 |
+ |
/* outgoing projected solid angles */ |
359 |
+ |
hemi_total = .0; |
360 |
|
for (o = dp->nout; o--; ) { |
269 |
– |
FVECT v; |
361 |
|
dom = getBSDF_outohm(dp,o); |
362 |
|
if (dom <= .0) { |
363 |
< |
error(WARNING, "zero/negative solid angle"); |
363 |
> |
error(WARNING, "zero/negative outgoing solid angle"); |
364 |
|
continue; |
365 |
|
} |
366 |
|
if (!getBSDF_outvec(v,dp,o) || v[2] < -FTINY) { |
367 |
|
error(WARNING, "illegal outgoing BSDF direction"); |
368 |
< |
free(omega_arr); |
368 |
> |
free(omega_iarr); free(omega_oarr); |
369 |
|
return(0); |
370 |
|
} |
371 |
< |
hemi_total += omega_arr[o] = dom*v[2]; |
371 |
> |
hemi_total += omega_oarr[o] = dom * v[2]; |
372 |
|
} |
373 |
|
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
374 |
|
sprintf(errmsg, "outgoing BSDF hemisphere off by %.1f%%", |
375 |
|
100.*(hemi_total/PI - 1.)); |
376 |
|
error(WARNING, errmsg); |
377 |
|
} |
378 |
< |
dom = PI / hemi_total; /* normalize solid angles */ |
378 |
> |
dom = PI / hemi_total; /* fix normalization */ |
379 |
|
for (o = dp->nout; o--; ) |
380 |
< |
omega_arr[o] *= dom; |
381 |
< |
nneg = 0; |
382 |
< |
for (i = dp->ninc; i--; ) { |
380 |
> |
omega_oarr[o] *= dom; |
381 |
> |
nneg = 0; /* check outgoing totals */ |
382 |
> |
for (i = 0; i < dp->ninc; i++) { |
383 |
|
hemi_total = .0; |
384 |
|
for (o = dp->nout; o--; ) { |
385 |
|
double f = BSDF_value(dp,i,o); |
386 |
< |
if (f > .0) |
387 |
< |
hemi_total += f*omega_arr[o]; |
388 |
< |
else if (f < -FTINY) |
389 |
< |
++nneg; |
386 |
> |
if (f >= .0) |
387 |
> |
hemi_total += f*omega_oarr[o]; |
388 |
> |
else { |
389 |
> |
nneg += (f < -FTINY); |
390 |
> |
BSDF_value(dp,i,o) = .0f; |
391 |
> |
} |
392 |
|
} |
393 |
|
if (hemi_total > 1.02) { |
394 |
< |
sprintf(errmsg, "BSDF direction passes %.1f%% of light", |
395 |
< |
100.*hemi_total); |
394 |
> |
sprintf(errmsg, |
395 |
> |
"incoming BSDF direction %d passes %.1f%% of light", |
396 |
> |
i, 100.*hemi_total); |
397 |
|
error(WARNING, errmsg); |
398 |
|
} |
399 |
|
} |
400 |
< |
free(omega_arr); |
401 |
< |
if (nneg > 0) { |
308 |
< |
sprintf(errmsg, "%d negative BSDF values", nneg); |
400 |
> |
if (nneg) { |
401 |
> |
sprintf(errmsg, "%d negative BSDF values (ignored)", nneg); |
402 |
|
error(WARNING, errmsg); |
310 |
– |
return(0); |
403 |
|
} |
404 |
+ |
/* reverse roles and check again */ |
405 |
+ |
for (o = 0; o < dp->nout; o++) { |
406 |
+ |
hemi_total = .0; |
407 |
+ |
for (i = dp->ninc; i--; ) |
408 |
+ |
hemi_total += BSDF_value(dp,i,o) * omega_iarr[i]; |
409 |
+ |
|
410 |
+ |
if (hemi_total > 1.02) { |
411 |
+ |
sprintf(errmsg, |
412 |
+ |
"outgoing BSDF direction %d collects %.1f%% of light", |
413 |
+ |
o, 100.*hemi_total); |
414 |
+ |
error(WARNING, errmsg); |
415 |
+ |
} |
416 |
+ |
} |
417 |
+ |
free(omega_iarr); free(omega_oarr); |
418 |
|
return(1); |
419 |
|
} |
420 |
|
|
454 |
|
return(NULL); |
455 |
|
} |
456 |
|
wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer"); |
457 |
+ |
load_angle_basis(ezxml_child(ezxml_child(wtl, |
458 |
+ |
"DataDefinition"), "AngleBasis")); |
459 |
|
dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data)); |
460 |
|
for (wld = ezxml_child(wtl, "WavelengthData"); |
461 |
|
wld != NULL; wld = wld->next) { |
542 |
|
return(normalize(v) != 0.0); |
543 |
|
} |
544 |
|
|
437 |
– |
|
438 |
– |
#define FEQ(a,b) ((a)-(b) <= 1e-7 && (b)-(a) <= 1e-7) |
545 |
|
|
546 |
|
static int |
547 |
|
addrot( /* compute rotation (x,y,z) => (xp,yp,zp) */ |