1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.20 2013/10/03 17:27:41 greg Exp $"; |
3 |
#endif |
4 |
/* |
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* Load measured BSDF interpolant and write out as XML file with tensor tree. |
6 |
* |
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* G. Ward |
8 |
*/ |
9 |
|
10 |
#define _USE_MATH_DEFINES |
11 |
#include <stdio.h> |
12 |
#include <stdlib.h> |
13 |
#include <math.h> |
14 |
#include "platform.h" |
15 |
#include "calcomp.h" |
16 |
#include "bsdfrep.h" |
17 |
/* global argv[0] */ |
18 |
char *progname; |
19 |
/* percentage to cull (<0 to turn off) */ |
20 |
double pctcull = 90.; |
21 |
/* sampling order */ |
22 |
int samp_order = 6; |
23 |
/* super-sampling threshold */ |
24 |
const double ssamp_thresh = 0.35; |
25 |
/* number of super-samples */ |
26 |
const int nssamp = 100; |
27 |
/* limit on number of RBF lobes */ |
28 |
static int lobe_lim = 15000; |
29 |
|
30 |
/* Output XML prologue to stdout */ |
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static void |
32 |
xml_prologue(int ac, char *av[]) |
33 |
{ |
34 |
puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
35 |
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\">"); |
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fputs("<!-- File produced by:", stdout); |
37 |
while (ac-- > 0) { |
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fputc(' ', stdout); |
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fputs(*av++, stdout); |
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} |
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puts(" -->"); |
42 |
puts("<WindowElementType>System</WindowElementType>"); |
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puts("<FileType>BSDF</FileType>"); |
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puts("<Optical>"); |
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puts("<Layer>"); |
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puts("\t<Material>"); |
47 |
printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown"); |
48 |
printf("\t\t<Manufacturer>%s</Manufacturer>\n", |
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bsdf_manuf[0] ? bsdf_manuf : "Unknown"); |
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puts("\t\t<DeviceType>Other</DeviceType>"); |
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puts("\t</Material>"); |
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puts("\t<DataDefinition>"); |
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printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n", |
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single_plane_incident ? '3' : '4'); |
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puts("\t</DataDefinition>"); |
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} |
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|
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/* Output XML data prologue to stdout */ |
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static void |
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data_prologue() |
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{ |
62 |
static const char *bsdf_type[4] = { |
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"Reflection Front", |
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"Transmission Front", |
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"Transmission Back", |
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"Reflection Back" |
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}; |
68 |
|
69 |
puts("\t<WavelengthData>"); |
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puts("\t\t<LayerNumber>System</LayerNumber>"); |
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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>"); |
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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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puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>"); |
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puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
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puts("\t\t\t<ScatteringData>"); |
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} |
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|
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/* Output XML data epilogue to stdout */ |
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static void |
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data_epilogue(void) |
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{ |
86 |
puts("\t\t\t</ScatteringData>"); |
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puts("\t\t</WavelengthDataBlock>"); |
88 |
puts("\t</WavelengthData>"); |
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} |
90 |
|
91 |
/* Output XML epilogue to stdout */ |
92 |
static void |
93 |
xml_epilogue(void) |
94 |
{ |
95 |
puts("</Layer>"); |
96 |
puts("</Optical>"); |
97 |
puts("</WindowElement>"); |
98 |
} |
99 |
|
100 |
/* Compute absolute relative difference */ |
101 |
static double |
102 |
abs_diff(double v1, double v0) |
103 |
{ |
104 |
if ((v0 < 0) | (v1 < 0)) |
105 |
return(.0); |
106 |
v1 = (v1-v0)*2./(v0+v1+.0001); |
107 |
if (v1 < 0) |
108 |
return(-v1); |
109 |
return(v1); |
110 |
} |
111 |
|
112 |
/* Interpolate and output isotropic BSDF data */ |
113 |
static void |
114 |
eval_isotropic(char *funame) |
115 |
{ |
116 |
const int sqres = 1<<samp_order; |
117 |
FILE *ofp = NULL; |
118 |
int assignD = 0; |
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char cmd[128]; |
120 |
int ix, ox, oy; |
121 |
double iovec[6]; |
122 |
float bsdf; |
123 |
|
124 |
data_prologue(); /* begin output */ |
125 |
if (pctcull >= 0) { |
126 |
sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d", |
127 |
pctcull, samp_order); |
128 |
fflush(stdout); |
129 |
ofp = popen(cmd, "w"); |
130 |
if (ofp == NULL) { |
131 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
132 |
progname); |
133 |
exit(1); |
134 |
} |
135 |
SET_FILE_BINARY(ofp); |
136 |
} else |
137 |
fputs("{\n", stdout); |
138 |
/* need to assign Dx, Dy, Dz? */ |
139 |
if (funame != NULL) |
140 |
assignD = (fundefined(funame) < 6); |
141 |
/* run through directions */ |
142 |
for (ix = 0; ix < sqres/2; ix++) { |
143 |
RBFNODE *rbf = NULL; |
144 |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
145 |
iovec[1] = .0; |
146 |
iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
147 |
if (funame == NULL) |
148 |
rbf = advect_rbf(iovec, lobe_lim); |
149 |
for (ox = 0; ox < sqres; ox++) { |
150 |
float last_bsdf = -1; |
151 |
for (oy = 0; oy < sqres; oy++) { |
152 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
153 |
iovec[5] = output_orient * |
154 |
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
155 |
if (funame == NULL) |
156 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
157 |
output_orient/iovec[5]; |
158 |
else { |
159 |
double ssa[3], ssvec[6], sum; |
160 |
int ssi; |
161 |
if (assignD) { |
162 |
varset("Dx", '=', -iovec[3]); |
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varset("Dy", '=', -iovec[4]); |
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varset("Dz", '=', -iovec[5]); |
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++eclock; |
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} |
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bsdf = funvalue(funame, 6, iovec); |
168 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
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sum = 0; /* super-sample voxel */ |
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for (ssi = nssamp; ssi--; ) { |
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SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp); |
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ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.; |
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ssvec[1] = .0; |
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ssvec[2] = input_orient * |
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sqrt(1. - ssvec[0]*ssvec[0]); |
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SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres, |
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(oy+ssa[2])/sqres); |
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ssvec[5] = output_orient * |
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sqrt(1. - ssvec[3]*ssvec[3] - |
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ssvec[4]*ssvec[4]); |
181 |
if (assignD) { |
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varset("Dx", '=', -iovec[3]); |
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varset("Dy", '=', -iovec[4]); |
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varset("Dz", '=', -iovec[5]); |
185 |
++eclock; |
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} |
187 |
sum += funvalue(funame, 6, ssvec); |
188 |
} |
189 |
bsdf = sum/nssamp; |
190 |
} |
191 |
} |
192 |
if (pctcull >= 0) |
193 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
194 |
else |
195 |
printf("\t%.3e\n", bsdf); |
196 |
last_bsdf = bsdf; |
197 |
} |
198 |
} |
199 |
if (rbf != NULL) |
200 |
free(rbf); |
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} |
202 |
if (pctcull >= 0) { /* finish output */ |
203 |
if (pclose(ofp)) { |
204 |
fprintf(stderr, "%s: error running '%s'\n", |
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progname, cmd); |
206 |
exit(1); |
207 |
} |
208 |
} else { |
209 |
for (ix = sqres*sqres*sqres/2; ix--; ) |
210 |
fputs("\t0\n", stdout); |
211 |
fputs("}\n", stdout); |
212 |
} |
213 |
data_epilogue(); |
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} |
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|
216 |
/* Interpolate and output anisotropic BSDF data */ |
217 |
static void |
218 |
eval_anisotropic(char *funame) |
219 |
{ |
220 |
const int sqres = 1<<samp_order; |
221 |
FILE *ofp = NULL; |
222 |
int assignD = 0; |
223 |
char cmd[128]; |
224 |
int ix, iy, ox, oy; |
225 |
double iovec[6]; |
226 |
float bsdf; |
227 |
|
228 |
data_prologue(); /* begin output */ |
229 |
if (pctcull >= 0) { |
230 |
sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d", |
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(input_orient>0 ^ output_orient>0) ? "" : " -a", |
232 |
pctcull, samp_order); |
233 |
fflush(stdout); |
234 |
ofp = popen(cmd, "w"); |
235 |
if (ofp == NULL) { |
236 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
237 |
progname); |
238 |
exit(1); |
239 |
} |
240 |
} else |
241 |
fputs("{\n", stdout); |
242 |
/* need to assign Dx, Dy, Dz? */ |
243 |
if (funame != NULL) |
244 |
assignD = (fundefined(funame) < 6); |
245 |
/* run through directions */ |
246 |
for (ix = 0; ix < sqres; ix++) |
247 |
for (iy = 0; iy < sqres; iy++) { |
248 |
RBFNODE *rbf = NULL; /* Klems reversal */ |
249 |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
250 |
iovec[2] = input_orient * |
251 |
sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
252 |
if (funame == NULL) |
253 |
rbf = advect_rbf(iovec, lobe_lim); |
254 |
for (ox = 0; ox < sqres; ox++) { |
255 |
float last_bsdf = -1; |
256 |
for (oy = 0; oy < sqres; oy++) { |
257 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
258 |
iovec[5] = output_orient * |
259 |
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
260 |
if (funame == NULL) |
261 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
262 |
output_orient/iovec[5]; |
263 |
else { |
264 |
double ssa[4], ssvec[6], sum; |
265 |
int ssi; |
266 |
if (assignD) { |
267 |
varset("Dx", '=', -iovec[3]); |
268 |
varset("Dy", '=', -iovec[4]); |
269 |
varset("Dz", '=', -iovec[5]); |
270 |
++eclock; |
271 |
} |
272 |
bsdf = funvalue(funame, 6, iovec); |
273 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
274 |
sum = 0; /* super-sample voxel */ |
275 |
for (ssi = nssamp; ssi--; ) { |
276 |
SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp); |
277 |
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
278 |
1.-(iy+ssa[1])/sqres); |
279 |
ssvec[2] = output_orient * |
280 |
sqrt(1. - ssvec[0]*ssvec[0] - |
281 |
ssvec[1]*ssvec[1]); |
282 |
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
283 |
(oy+ssa[3])/sqres); |
284 |
ssvec[5] = output_orient * |
285 |
sqrt(1. - ssvec[3]*ssvec[3] - |
286 |
ssvec[4]*ssvec[4]); |
287 |
if (assignD) { |
288 |
varset("Dx", '=', -iovec[3]); |
289 |
varset("Dy", '=', -iovec[4]); |
290 |
varset("Dz", '=', -iovec[5]); |
291 |
++eclock; |
292 |
} |
293 |
sum += funvalue(funame, 6, ssvec); |
294 |
} |
295 |
bsdf = sum/nssamp; |
296 |
} |
297 |
} |
298 |
if (pctcull >= 0) |
299 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
300 |
else |
301 |
printf("\t%.3e\n", bsdf); |
302 |
last_bsdf = bsdf; |
303 |
} |
304 |
} |
305 |
if (rbf != NULL) |
306 |
free(rbf); |
307 |
} |
308 |
if (pctcull >= 0) { /* finish output */ |
309 |
if (pclose(ofp)) { |
310 |
fprintf(stderr, "%s: error running '%s'\n", |
311 |
progname, cmd); |
312 |
exit(1); |
313 |
} |
314 |
} else |
315 |
fputs("}\n", stdout); |
316 |
data_epilogue(); |
317 |
} |
318 |
|
319 |
/* Read in BSDF and interpolate as tensor tree representation */ |
320 |
int |
321 |
main(int argc, char *argv[]) |
322 |
{ |
323 |
int dofwd = 0, dobwd = 1; |
324 |
int i, na; |
325 |
|
326 |
progname = argv[0]; |
327 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
328 |
esupport &= ~(E_INCHAN|E_OUTCHAN); |
329 |
scompile("PI:3.14159265358979323846", NULL, 0); |
330 |
biggerlib(); |
331 |
for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
332 |
switch (argv[i][1]) { /* get options */ |
333 |
case 'e': |
334 |
scompile(argv[++i], NULL, 0); |
335 |
break; |
336 |
case 'f': |
337 |
if (!argv[i][2]) |
338 |
fcompile(argv[++i]); |
339 |
else |
340 |
dofwd = (argv[i][0] == '+'); |
341 |
break; |
342 |
case 'b': |
343 |
dobwd = (argv[i][0] == '+'); |
344 |
break; |
345 |
case 't': |
346 |
switch (argv[i][2]) { |
347 |
case '3': |
348 |
single_plane_incident = 1; |
349 |
break; |
350 |
case '4': |
351 |
single_plane_incident = 0; |
352 |
break; |
353 |
case '\0': |
354 |
pctcull = atof(argv[++i]); |
355 |
break; |
356 |
default: |
357 |
goto userr; |
358 |
} |
359 |
break; |
360 |
case 'g': |
361 |
samp_order = atoi(argv[++i]); |
362 |
break; |
363 |
case 'l': |
364 |
lobe_lim = atoi(argv[++i]); |
365 |
break; |
366 |
default: |
367 |
goto userr; |
368 |
} |
369 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
370 |
void (*evf)(char *s) = single_plane_incident ? |
371 |
&eval_isotropic : &eval_anisotropic; |
372 |
if (i != argc-1 || fundefined(argv[i]) < 3) { |
373 |
fprintf(stderr, |
374 |
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
375 |
progname); |
376 |
fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n", |
377 |
progname); |
378 |
goto userr; |
379 |
} |
380 |
++eclock; |
381 |
xml_prologue(argc, argv); /* start XML output */ |
382 |
if (dofwd) { |
383 |
input_orient = -1; |
384 |
output_orient = -1; |
385 |
(*evf)(argv[i]); /* outside reflectance */ |
386 |
output_orient = 1; |
387 |
(*evf)(argv[i]); /* outside -> inside */ |
388 |
} |
389 |
if (dobwd) { |
390 |
input_orient = 1; |
391 |
output_orient = 1; |
392 |
(*evf)(argv[i]); /* inside reflectance */ |
393 |
output_orient = -1; |
394 |
(*evf)(argv[i]); /* inside -> outside */ |
395 |
} |
396 |
xml_epilogue(); /* finish XML output & exit */ |
397 |
return(0); |
398 |
} |
399 |
if (i < argc) { /* open input files if given */ |
400 |
int nbsdf = 0; |
401 |
for ( ; i < argc; i++) { /* interpolate each component */ |
402 |
FILE *fpin = fopen(argv[i], "rb"); |
403 |
if (fpin == NULL) { |
404 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
405 |
progname, argv[i]); |
406 |
return(1); |
407 |
} |
408 |
if (!load_bsdf_rep(fpin)) |
409 |
return(1); |
410 |
fclose(fpin); |
411 |
if (!nbsdf++) /* start XML on first dist. */ |
412 |
xml_prologue(argc, argv); |
413 |
if (single_plane_incident) |
414 |
eval_isotropic(NULL); |
415 |
else |
416 |
eval_anisotropic(NULL); |
417 |
} |
418 |
xml_epilogue(); /* finish XML output & exit */ |
419 |
return(0); |
420 |
} |
421 |
SET_FILE_BINARY(stdin); /* load from stdin */ |
422 |
if (!load_bsdf_rep(stdin)) |
423 |
return(1); |
424 |
xml_prologue(argc, argv); /* start XML output */ |
425 |
if (single_plane_incident) /* resample dist. */ |
426 |
eval_isotropic(NULL); |
427 |
else |
428 |
eval_anisotropic(NULL); |
429 |
xml_epilogue(); /* finish XML output & exit */ |
430 |
return(0); |
431 |
userr: |
432 |
fprintf(stderr, |
433 |
"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n", |
434 |
progname); |
435 |
fprintf(stderr, |
436 |
" or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
437 |
progname); |
438 |
return(1); |
439 |
} |