1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: bsdf2klems.c,v 2.1 2013/04/21 23:01:14 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Load measured BSDF interpolant and write out as XML file with Klems matrix. |
6 |
* |
7 |
* G. Ward |
8 |
*/ |
9 |
|
10 |
#define _USE_MATH_DEFINES |
11 |
#include <stdio.h> |
12 |
#include <stdlib.h> |
13 |
#include <string.h> |
14 |
#include <math.h> |
15 |
#include "random.h" |
16 |
#include "platform.h" |
17 |
#include "calcomp.h" |
18 |
#include "bsdfrep.h" |
19 |
#include "bsdf_m.h" |
20 |
/* global argv[0] */ |
21 |
char *progname; |
22 |
/* selected basis function name */ |
23 |
static const char *kbasis = "LBNL/Klems Full"; |
24 |
/* number of BSDF samples per patch */ |
25 |
static int npsamps = 256; |
26 |
|
27 |
/* Return angle basis corresponding to the given name */ |
28 |
ANGLE_BASIS * |
29 |
get_basis(const char *bn) |
30 |
{ |
31 |
int n = nabases; |
32 |
|
33 |
while (n-- > 0) |
34 |
if (!strcasecmp(bn, abase_list[n].name)) |
35 |
return &abase_list[n]; |
36 |
return NULL; |
37 |
} |
38 |
|
39 |
/* Output XML prologue to stdout */ |
40 |
static void |
41 |
xml_prologue(int ac, char *av[]) |
42 |
{ |
43 |
ANGLE_BASIS *abp = get_basis(kbasis); |
44 |
int i; |
45 |
|
46 |
if (abp == NULL) { |
47 |
fprintf(stderr, "%s: unknown angle basis '%s'\n", progname, kbasis); |
48 |
exit(1); |
49 |
} |
50 |
puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
51 |
puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">"); |
52 |
fputs("<!-- File produced by:", stdout); |
53 |
while (ac-- > 0) { |
54 |
fputc(' ', stdout); |
55 |
fputs(*av++, stdout); |
56 |
} |
57 |
puts(" -->"); |
58 |
puts("<WindowElementType>System</WindowElementType>"); |
59 |
puts("<FileType>BSDF</FileType>"); |
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puts("<Optical>"); |
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puts("<Layer>"); |
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puts("\t<Material>"); |
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puts("\t\t<Name>Name</Name>"); |
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puts("\t\t<Manufacturer>Manufacturer</Manufacturer>"); |
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puts("\t\t<DeviceType>Other</DeviceType>"); |
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puts("\t</Material>"); |
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puts("\t<DataDefinition>"); |
68 |
puts("\t\t<IncidentDataStructure>Columns</IncidentDataStructure>"); |
69 |
puts("\t\t<AngleBasis>"); |
70 |
printf("\t\t\t<AngleBasisName>%s</AngleBasisName>\n", kbasis); |
71 |
for (i = 0; abp->lat[i].nphis; i++) { |
72 |
puts("\t\t\t<AngleBasisBlock>"); |
73 |
printf("\t\t\t<Theta>%g</Theta>\n", i ? |
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.5*(abp->lat[i].tmin + abp->lat[i+1].tmin) : |
75 |
.0 ); |
76 |
printf("\t\t\t<nPhis>%d</nPhis>", abp->lat[i].nphis); |
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puts("\t\t\t<ThetaBounds>"); |
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printf("\t\t\t\t<LowerTheta>%g</LowerTheta>\n", abp->lat[i].tmin); |
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printf("\t\t\t\t<UpperTheta>%g</UpperTheta>\n", abp->lat[i+1].tmin); |
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puts("\t\t\t</ThetaBounds>"); |
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puts("\t\t\t</AngleBasisBlock>"); |
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} |
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puts("\t\t</AngleBasis>"); |
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puts("\t</DataDefinition>"); |
85 |
} |
86 |
|
87 |
/* Output XML data prologue to stdout */ |
88 |
static void |
89 |
data_prologue() |
90 |
{ |
91 |
static const char *bsdf_type[4] = { |
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"Reflection Front", |
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"Transmission Front", |
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"Transmission Back", |
95 |
"Reflection Back" |
96 |
}; |
97 |
|
98 |
puts("\t<WavelengthData>"); |
99 |
puts("\t\t<LayerNumber>System</LayerNumber>"); |
100 |
puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>"); |
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puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>"); |
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puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>"); |
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puts("\t\t<WavelengthDataBlock>"); |
104 |
printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n", |
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bsdf_type[(input_orient>0)<<1 | (output_orient>0)]); |
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printf("\t\t\t<ColumnAngleBasis>%s</ColumnAngleBasis>\n", kbasis); |
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printf("\t\t\t<RowAngleBasis>%s</RowAngleBasis>\n", kbasis); |
108 |
puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
109 |
puts("\t\t\t<ScatteringData>"); |
110 |
} |
111 |
|
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/* Output XML data epilogue to stdout */ |
113 |
static void |
114 |
data_epilogue(void) |
115 |
{ |
116 |
puts("\t\t\t</ScatteringData>"); |
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puts("\t\t</WavelengthDataBlock>"); |
118 |
puts("\t</WavelengthData>"); |
119 |
} |
120 |
|
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/* Output XML epilogue to stdout */ |
122 |
static void |
123 |
xml_epilogue(void) |
124 |
{ |
125 |
puts("</Layer>"); |
126 |
puts("</Optical>"); |
127 |
puts("</WindowElement>"); |
128 |
} |
129 |
|
130 |
/* Load and resample XML BSDF description using Klems basis */ |
131 |
static void |
132 |
eval_bsdf(const char *fname) |
133 |
{ |
134 |
ANGLE_BASIS *abp = get_basis(kbasis); |
135 |
SDData bsd; |
136 |
SDError ec; |
137 |
FVECT vin, vout; |
138 |
SDValue sv; |
139 |
double sum; |
140 |
int i, j, n; |
141 |
|
142 |
SDclearBSDF(&bsd, fname); /* load BSDF file */ |
143 |
if ((ec = SDloadFile(&bsd, fname)) != SDEnone) |
144 |
goto err; |
145 |
/* front reflection */ |
146 |
if (bsd.rf != NULL || bsd.rLambFront.cieY > .002) { |
147 |
input_orient = 1; output_orient = 1; |
148 |
data_prologue(); |
149 |
for (j = 0; j < abp->nangles; j++) { |
150 |
for (i = 0; i < abp->nangles; i++) { |
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sum = 0; /* average over patches */ |
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for (n = npsamps; n-- > 0; ) { |
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fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
154 |
fi_getvec(vin, i+(n+frandom())/npsamps, abp); |
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ec = SDevalBSDF(&sv, vout, vin, &bsd); |
156 |
if (ec != SDEnone) |
157 |
goto err; |
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sum += sv.cieY; |
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} |
160 |
printf("\t%.3e\n", sum/npsamps); |
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} |
162 |
putchar('\n'); /* extra space between rows */ |
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} |
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data_epilogue(); |
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} |
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/* back reflection */ |
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if (bsd.rb != NULL || bsd.rLambBack.cieY > .002) { |
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input_orient = -1; output_orient = -1; |
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data_prologue(); |
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for (j = 0; j < abp->nangles; j++) { |
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for (i = 0; i < abp->nangles; i++) { |
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sum = 0; /* average over patches */ |
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for (n = npsamps; n-- > 0; ) { |
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bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
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bi_getvec(vin, i+(n+frandom())/npsamps, abp); |
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ec = SDevalBSDF(&sv, vout, vin, &bsd); |
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if (ec != SDEnone) |
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goto err; |
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sum += sv.cieY; |
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} |
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printf("\t%.3e\n", sum/npsamps); |
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} |
183 |
putchar('\n'); /* extra space between rows */ |
184 |
} |
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data_epilogue(); |
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} |
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/* front transmission */ |
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if (bsd.tf != NULL || bsd.tLamb.cieY > .002) { |
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input_orient = 1; output_orient = -1; |
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data_prologue(); |
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for (j = 0; j < abp->nangles; j++) { |
192 |
for (i = 0; i < abp->nangles; i++) { |
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sum = 0; /* average over patches */ |
194 |
for (n = npsamps; n-- > 0; ) { |
195 |
bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
196 |
fi_getvec(vin, i+(n+frandom())/npsamps, abp); |
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ec = SDevalBSDF(&sv, vout, vin, &bsd); |
198 |
if (ec != SDEnone) |
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goto err; |
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sum += sv.cieY; |
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} |
202 |
printf("\t%.3e\n", sum/npsamps); |
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} |
204 |
putchar('\n'); /* extra space between rows */ |
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} |
206 |
data_epilogue(); |
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} |
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/* back transmission */ |
209 |
if (bsd.tb != NULL) { |
210 |
input_orient = -1; output_orient = 1; |
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data_prologue(); |
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for (j = 0; j < abp->nangles; j++) { |
213 |
for (i = 0; i < abp->nangles; i++) { |
214 |
sum = 0; /* average over patches */ |
215 |
for (n = npsamps; n-- > 0; ) { |
216 |
fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
217 |
bi_getvec(vin, i+(n+frandom())/npsamps, abp); |
218 |
ec = SDevalBSDF(&sv, vout, vin, &bsd); |
219 |
if (ec != SDEnone) |
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goto err; |
221 |
sum += sv.cieY; |
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} |
223 |
printf("\t%.3e\n", sum/npsamps); |
224 |
} |
225 |
putchar('\n'); /* extra space between rows */ |
226 |
} |
227 |
data_epilogue(); |
228 |
} |
229 |
SDfreeBSDF(&bsd); /* all done */ |
230 |
return; |
231 |
err: |
232 |
SDreportError(ec, stderr); |
233 |
exit(1); |
234 |
} |
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|
236 |
/* Interpolate and output a BSDF function using Klems basis */ |
237 |
static void |
238 |
eval_function(char *funame) |
239 |
{ |
240 |
ANGLE_BASIS *abp = get_basis(kbasis); |
241 |
double iovec[6]; |
242 |
double sum; |
243 |
int i, j, n; |
244 |
|
245 |
data_prologue(); /* begin output */ |
246 |
for (j = 0; j < abp->nangles; j++) { /* run through directions */ |
247 |
for (i = 0; i < abp->nangles; i++) { |
248 |
sum = 0; |
249 |
for (n = npsamps; n--; ) { /* average over patches */ |
250 |
if (output_orient > 0) |
251 |
fo_getvec(iovec+3, j+(n+frandom())/npsamps, abp); |
252 |
else |
253 |
bo_getvec(iovec+3, j+(n+frandom())/npsamps, abp); |
254 |
|
255 |
if (input_orient > 0) |
256 |
fi_getvec(iovec, i+(n+frandom())/npsamps, abp); |
257 |
else |
258 |
bi_getvec(iovec, i+(n+frandom())/npsamps, abp); |
259 |
|
260 |
sum += funvalue(funame, 6, iovec); |
261 |
} |
262 |
printf("\t%.3e\n", sum/npsamps); |
263 |
} |
264 |
putchar('\n'); |
265 |
} |
266 |
data_epilogue(); /* finish output */ |
267 |
} |
268 |
|
269 |
/* Interpolate and output a radial basis function BSDF representation */ |
270 |
static void |
271 |
eval_rbf(void) |
272 |
{ |
273 |
#define MAXPATCHES 145 |
274 |
ANGLE_BASIS *abp = get_basis(kbasis); |
275 |
float bsdfarr[MAXPATCHES*MAXPATCHES]; |
276 |
FVECT vin, vout; |
277 |
RBFNODE *rbf; |
278 |
double sum; |
279 |
int i, j, n; |
280 |
/* sanity check */ |
281 |
if (abp->nangles > MAXPATCHES) { |
282 |
fprintf(stderr, "%s: too many patches!\n", progname); |
283 |
exit(1); |
284 |
} |
285 |
data_prologue(); /* begin output */ |
286 |
for (i = 0; i < abp->nangles; i++) { |
287 |
if (input_orient > 0) /* use incident patch center */ |
288 |
fi_getvec(vin, i+.5*(i>0), abp); |
289 |
else |
290 |
bi_getvec(vin, i+.5*(i>0), abp); |
291 |
|
292 |
rbf = advect_rbf(vin); /* compute radial basis func */ |
293 |
|
294 |
for (j = 0; j < abp->nangles; j++) { |
295 |
sum = 0; /* sample over exiting patch */ |
296 |
for (n = npsamps; n--; ) { |
297 |
if (output_orient > 0) |
298 |
fo_getvec(vout, j+(n+frandom())/npsamps, abp); |
299 |
else |
300 |
bo_getvec(vout, j+(n+frandom())/npsamps, abp); |
301 |
|
302 |
sum += eval_rbfrep(rbf, vout) / vout[2]; |
303 |
} |
304 |
bsdfarr[j*abp->nangles + i] = sum*output_orient/npsamps; |
305 |
} |
306 |
} |
307 |
n = 0; /* write out our matrix */ |
308 |
for (j = 0; j < abp->nangles; j++) { |
309 |
for (i = 0; i < abp->nangles; i++) |
310 |
printf("\t%.3e\n", bsdfarr[n++]); |
311 |
putchar('\n'); |
312 |
} |
313 |
data_epilogue(); /* finish output */ |
314 |
#undef MAXPATCHES |
315 |
} |
316 |
|
317 |
/* Read in BSDF and interpolate as Klems matrix representation */ |
318 |
int |
319 |
main(int argc, char *argv[]) |
320 |
{ |
321 |
int dofwd = 0, dobwd = 1; |
322 |
char *cp; |
323 |
int i, na; |
324 |
|
325 |
progname = argv[0]; |
326 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
327 |
esupport &= ~(E_INCHAN|E_OUTCHAN); |
328 |
scompile("PI:3.14159265358979323846", NULL, 0); |
329 |
biggerlib(); |
330 |
for (i = 1; i < argc && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
331 |
switch (argv[i][1]) { /* get options */ |
332 |
case 'n': |
333 |
npsamps = atoi(argv[++i]); |
334 |
if (npsamps <= 0) |
335 |
goto userr; |
336 |
break; |
337 |
case 'e': |
338 |
scompile(argv[++i], NULL, 0); |
339 |
single_plane_incident = 0; |
340 |
break; |
341 |
case 'f': |
342 |
if (!argv[i][2]) { |
343 |
fcompile(argv[++i]); |
344 |
single_plane_incident = 0; |
345 |
} else |
346 |
dofwd = (argv[i][0] == '+'); |
347 |
break; |
348 |
case 'b': |
349 |
dobwd = (argv[i][0] == '+'); |
350 |
break; |
351 |
case 'h': |
352 |
kbasis = "LBNL/Klems Half"; |
353 |
break; |
354 |
case 'q': |
355 |
kbasis = "LBNL/Klems Quarter"; |
356 |
break; |
357 |
default: |
358 |
goto userr; |
359 |
} |
360 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
361 |
if (i != argc-1 || fundefined(argv[i]) != 6) { |
362 |
fprintf(stderr, |
363 |
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
364 |
progname); |
365 |
goto userr; |
366 |
} |
367 |
xml_prologue(argc, argv); /* start XML output */ |
368 |
if (dofwd) { |
369 |
input_orient = -1; |
370 |
output_orient = -1; |
371 |
eval_function(argv[i]); /* outside reflectance */ |
372 |
output_orient = 1; |
373 |
eval_function(argv[i]); /* outside -> inside */ |
374 |
} |
375 |
if (dobwd) { |
376 |
input_orient = 1; |
377 |
output_orient = 1; |
378 |
eval_function(argv[i]); /* inside reflectance */ |
379 |
output_orient = -1; |
380 |
eval_function(argv[i]); /* inside -> outside */ |
381 |
} |
382 |
xml_epilogue(); /* finish XML output & exit */ |
383 |
return(0); |
384 |
} |
385 |
/* XML input? */ |
386 |
if (i == argc-1 && (cp = argv[i]+strlen(argv[i])-4) > argv[i] && |
387 |
!strcasecmp(cp, ".xml")) { |
388 |
xml_prologue(argc, argv); /* start XML output */ |
389 |
eval_bsdf(argv[i]); /* load & resample BSDF */ |
390 |
xml_epilogue(); /* finish XML output & exit */ |
391 |
return(0); |
392 |
} |
393 |
if (i < argc) { /* open input files if given */ |
394 |
int nbsdf = 0; |
395 |
for ( ; i < argc; i++) { /* interpolate each component */ |
396 |
FILE *fpin = fopen(argv[i], "rb"); |
397 |
if (fpin == NULL) { |
398 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
399 |
progname, argv[i]); |
400 |
return(1); |
401 |
} |
402 |
if (!load_bsdf_rep(fpin)) |
403 |
return(1); |
404 |
fclose(fpin); |
405 |
if (!nbsdf++) /* start XML on first dist. */ |
406 |
xml_prologue(argc, argv); |
407 |
eval_rbf(); |
408 |
} |
409 |
xml_epilogue(); /* finish XML output & exit */ |
410 |
return(0); |
411 |
} |
412 |
SET_FILE_BINARY(stdin); /* load from stdin */ |
413 |
if (!load_bsdf_rep(stdin)) |
414 |
return(1); |
415 |
xml_prologue(argc, argv); /* start XML output */ |
416 |
eval_rbf(); /* resample dist. */ |
417 |
xml_epilogue(); /* finish XML output & exit */ |
418 |
return(0); |
419 |
userr: |
420 |
fprintf(stderr, |
421 |
"Usage: %s [-n spp][-h|-q][bsdf.sir ..] > bsdf.xml\n", |
422 |
progname); |
423 |
fprintf(stderr, |
424 |
" or: %s [-n spp][-h|-q] bsdf_in.xml > bsdf_out.xml\n", |
425 |
progname); |
426 |
fprintf(stderr, |
427 |
" or: %s [-n spp][-h|-q][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
428 |
progname); |
429 |
return(1); |
430 |
} |