| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.17 2013/08/02 20:56:19 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Load measured BSDF interpolant and write out as XML file with tensor tree. |
| 6 |
* |
| 7 |
* 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 */ |
| 31 |
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\">"); |
| 36 |
fputs("<!-- File produced by:", stdout); |
| 37 |
while (ac-- > 0) { |
| 38 |
fputc(' ', stdout); |
| 39 |
fputs(*av++, stdout); |
| 40 |
} |
| 41 |
puts(" -->"); |
| 42 |
puts("<WindowElementType>System</WindowElementType>"); |
| 43 |
puts("<FileType>BSDF</FileType>"); |
| 44 |
puts("<Optical>"); |
| 45 |
puts("<Layer>"); |
| 46 |
puts("\t<Material>"); |
| 47 |
puts("\t\t<Name>Name</Name>"); |
| 48 |
puts("\t\t<Manufacturer>Manufacturer</Manufacturer>"); |
| 49 |
puts("\t\t<DeviceType>Other</DeviceType>"); |
| 50 |
puts("\t</Material>"); |
| 51 |
puts("\t<DataDefinition>"); |
| 52 |
printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n", |
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single_plane_incident ? '3' : '4'); |
| 54 |
puts("\t</DataDefinition>"); |
| 55 |
} |
| 56 |
|
| 57 |
/* Output XML data prologue to stdout */ |
| 58 |
static void |
| 59 |
data_prologue() |
| 60 |
{ |
| 61 |
static const char *bsdf_type[4] = { |
| 62 |
"Reflection Front", |
| 63 |
"Transmission Front", |
| 64 |
"Transmission Back", |
| 65 |
"Reflection Back" |
| 66 |
}; |
| 67 |
|
| 68 |
puts("\t<WavelengthData>"); |
| 69 |
puts("\t\t<LayerNumber>System</LayerNumber>"); |
| 70 |
puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>"); |
| 71 |
puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>"); |
| 72 |
puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>"); |
| 73 |
puts("\t\t<WavelengthDataBlock>"); |
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printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n", |
| 75 |
bsdf_type[(input_orient>0)<<1 | (output_orient>0)]); |
| 76 |
puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>"); |
| 77 |
puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>"); |
| 78 |
puts("\t\t\t<ScatteringData>"); |
| 79 |
} |
| 80 |
|
| 81 |
/* Output XML data epilogue to stdout */ |
| 82 |
static void |
| 83 |
data_epilogue(void) |
| 84 |
{ |
| 85 |
puts("\t\t\t</ScatteringData>"); |
| 86 |
puts("\t\t</WavelengthDataBlock>"); |
| 87 |
puts("\t</WavelengthData>"); |
| 88 |
} |
| 89 |
|
| 90 |
/* Output XML epilogue to stdout */ |
| 91 |
static void |
| 92 |
xml_epilogue(void) |
| 93 |
{ |
| 94 |
puts("</Layer>"); |
| 95 |
puts("</Optical>"); |
| 96 |
puts("</WindowElement>"); |
| 97 |
} |
| 98 |
|
| 99 |
/* Compute absolute relative difference */ |
| 100 |
static double |
| 101 |
abs_diff(double v1, double v0) |
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{ |
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if ((v0 < 0) | (v1 < 0)) |
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return(.0); |
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v1 = (v1-v0)*2./(v0+v1+.0001); |
| 106 |
if (v1 < 0) |
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return(-v1); |
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return(v1); |
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} |
| 110 |
|
| 111 |
/* Interpolate and output isotropic BSDF data */ |
| 112 |
static void |
| 113 |
eval_isotropic(char *funame) |
| 114 |
{ |
| 115 |
const int sqres = 1<<samp_order; |
| 116 |
FILE *ofp = NULL; |
| 117 |
int assignD = 0; |
| 118 |
char cmd[128]; |
| 119 |
int ix, ox, oy; |
| 120 |
double iovec[6]; |
| 121 |
float bsdf; |
| 122 |
|
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data_prologue(); /* begin output */ |
| 124 |
if (pctcull >= 0) { |
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sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d", |
| 126 |
pctcull, samp_order); |
| 127 |
fflush(stdout); |
| 128 |
ofp = popen(cmd, "w"); |
| 129 |
if (ofp == NULL) { |
| 130 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
| 131 |
progname); |
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exit(1); |
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} |
| 134 |
SET_FILE_BINARY(ofp); |
| 135 |
} else |
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fputs("{\n", stdout); |
| 137 |
/* need to assign Dx, Dy, Dz? */ |
| 138 |
if (funame != NULL) |
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assignD = (fundefined(funame) < 6); |
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/* run through directions */ |
| 141 |
for (ix = 0; ix < sqres/2; ix++) { |
| 142 |
RBFNODE *rbf = NULL; |
| 143 |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
| 144 |
iovec[1] = .0; |
| 145 |
iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
| 146 |
if (funame == NULL) |
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rbf = advect_rbf(iovec, lobe_lim); |
| 148 |
for (ox = 0; ox < sqres; ox++) { |
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float last_bsdf = -1; |
| 150 |
for (oy = 0; oy < sqres; oy++) { |
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SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
| 152 |
iovec[5] = output_orient * |
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sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
| 154 |
if (funame == NULL) |
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bsdf = eval_rbfrep(rbf, iovec+3) * |
| 156 |
output_orient/iovec[5]; |
| 157 |
else { |
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double ssa[3], ssvec[6], sum; |
| 159 |
int ssi; |
| 160 |
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]); |
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++eclock; |
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} |
| 166 |
bsdf = funvalue(funame, 6, iovec); |
| 167 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
| 168 |
sum = 0; /* super-sample voxel */ |
| 169 |
for (ssi = nssamp; ssi--; ) { |
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SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp); |
| 171 |
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, |
| 176 |
(oy+ssa[2])/sqres); |
| 177 |
ssvec[5] = output_orient * |
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sqrt(1. - ssvec[3]*ssvec[3] - |
| 179 |
ssvec[4]*ssvec[4]); |
| 180 |
if (assignD) { |
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varset("Dx", '=', -iovec[3]); |
| 182 |
varset("Dy", '=', -iovec[4]); |
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varset("Dz", '=', -iovec[5]); |
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++eclock; |
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} |
| 186 |
sum += funvalue(funame, 6, ssvec); |
| 187 |
} |
| 188 |
bsdf = sum/nssamp; |
| 189 |
} |
| 190 |
} |
| 191 |
if (pctcull >= 0) |
| 192 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
| 193 |
else |
| 194 |
printf("\t%.3e\n", bsdf); |
| 195 |
last_bsdf = bsdf; |
| 196 |
} |
| 197 |
} |
| 198 |
if (rbf != NULL) |
| 199 |
free(rbf); |
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} |
| 201 |
if (pctcull >= 0) { /* finish output */ |
| 202 |
if (pclose(ofp)) { |
| 203 |
fprintf(stderr, "%s: error running '%s'\n", |
| 204 |
progname, cmd); |
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exit(1); |
| 206 |
} |
| 207 |
} else { |
| 208 |
for (ix = sqres*sqres*sqres/2; ix--; ) |
| 209 |
fputs("\t0\n", stdout); |
| 210 |
fputs("}\n", stdout); |
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} |
| 212 |
data_epilogue(); |
| 213 |
} |
| 214 |
|
| 215 |
/* Interpolate and output anisotropic BSDF data */ |
| 216 |
static void |
| 217 |
eval_anisotropic(char *funame) |
| 218 |
{ |
| 219 |
const int sqres = 1<<samp_order; |
| 220 |
FILE *ofp = NULL; |
| 221 |
int assignD = 0; |
| 222 |
char cmd[128]; |
| 223 |
int ix, iy, ox, oy; |
| 224 |
double iovec[6]; |
| 225 |
float bsdf; |
| 226 |
|
| 227 |
data_prologue(); /* begin output */ |
| 228 |
if (pctcull >= 0) { |
| 229 |
sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d", |
| 230 |
pctcull, samp_order); |
| 231 |
fflush(stdout); |
| 232 |
ofp = popen(cmd, "w"); |
| 233 |
if (ofp == NULL) { |
| 234 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
| 235 |
progname); |
| 236 |
exit(1); |
| 237 |
} |
| 238 |
} else |
| 239 |
fputs("{\n", stdout); |
| 240 |
/* need to assign Dx, Dy, Dz? */ |
| 241 |
if (funame != NULL) |
| 242 |
assignD = (fundefined(funame) < 6); |
| 243 |
/* run through directions */ |
| 244 |
for (ix = 0; ix < sqres; ix++) |
| 245 |
for (iy = 0; iy < sqres; iy++) { |
| 246 |
RBFNODE *rbf = NULL; /* Klems reversal */ |
| 247 |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
| 248 |
iovec[2] = input_orient * |
| 249 |
sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
| 250 |
if (funame == NULL) |
| 251 |
rbf = advect_rbf(iovec, lobe_lim); |
| 252 |
for (ox = 0; ox < sqres; ox++) { |
| 253 |
float last_bsdf = -1; |
| 254 |
for (oy = 0; oy < sqres; oy++) { |
| 255 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
| 256 |
iovec[5] = output_orient * |
| 257 |
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
| 258 |
if (funame == NULL) |
| 259 |
bsdf = eval_rbfrep(rbf, iovec+3) * |
| 260 |
output_orient/iovec[5]; |
| 261 |
else { |
| 262 |
double ssa[4], ssvec[6], sum; |
| 263 |
int ssi; |
| 264 |
if (assignD) { |
| 265 |
varset("Dx", '=', -iovec[3]); |
| 266 |
varset("Dy", '=', -iovec[4]); |
| 267 |
varset("Dz", '=', -iovec[5]); |
| 268 |
++eclock; |
| 269 |
} |
| 270 |
bsdf = funvalue(funame, 6, iovec); |
| 271 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
| 272 |
sum = 0; /* super-sample voxel */ |
| 273 |
for (ssi = nssamp; ssi--; ) { |
| 274 |
SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp); |
| 275 |
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
| 276 |
1.-(iy+ssa[1])/sqres); |
| 277 |
ssvec[2] = output_orient * |
| 278 |
sqrt(1. - ssvec[0]*ssvec[0] - |
| 279 |
ssvec[1]*ssvec[1]); |
| 280 |
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
| 281 |
(oy+ssa[3])/sqres); |
| 282 |
ssvec[5] = output_orient * |
| 283 |
sqrt(1. - ssvec[3]*ssvec[3] - |
| 284 |
ssvec[4]*ssvec[4]); |
| 285 |
if (assignD) { |
| 286 |
varset("Dx", '=', -iovec[3]); |
| 287 |
varset("Dy", '=', -iovec[4]); |
| 288 |
varset("Dz", '=', -iovec[5]); |
| 289 |
++eclock; |
| 290 |
} |
| 291 |
sum += funvalue(funame, 6, ssvec); |
| 292 |
} |
| 293 |
bsdf = sum/nssamp; |
| 294 |
} |
| 295 |
} |
| 296 |
if (pctcull >= 0) |
| 297 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
| 298 |
else |
| 299 |
printf("\t%.3e\n", bsdf); |
| 300 |
last_bsdf = bsdf; |
| 301 |
} |
| 302 |
} |
| 303 |
if (rbf != NULL) |
| 304 |
free(rbf); |
| 305 |
} |
| 306 |
if (pctcull >= 0) { /* finish output */ |
| 307 |
if (pclose(ofp)) { |
| 308 |
fprintf(stderr, "%s: error running '%s'\n", |
| 309 |
progname, cmd); |
| 310 |
exit(1); |
| 311 |
} |
| 312 |
} else |
| 313 |
fputs("}\n", stdout); |
| 314 |
data_epilogue(); |
| 315 |
} |
| 316 |
|
| 317 |
/* Read in BSDF and interpolate as tensor tree representation */ |
| 318 |
int |
| 319 |
main(int argc, char *argv[]) |
| 320 |
{ |
| 321 |
int dofwd = 0, dobwd = 1; |
| 322 |
int i, na; |
| 323 |
|
| 324 |
progname = argv[0]; |
| 325 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
| 326 |
esupport &= ~(E_INCHAN|E_OUTCHAN); |
| 327 |
scompile("PI:3.14159265358979323846", NULL, 0); |
| 328 |
biggerlib(); |
| 329 |
for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
| 330 |
switch (argv[i][1]) { /* get options */ |
| 331 |
case 'e': |
| 332 |
scompile(argv[++i], NULL, 0); |
| 333 |
break; |
| 334 |
case 'f': |
| 335 |
if (!argv[i][2]) |
| 336 |
fcompile(argv[++i]); |
| 337 |
else |
| 338 |
dofwd = (argv[i][0] == '+'); |
| 339 |
break; |
| 340 |
case 'b': |
| 341 |
dobwd = (argv[i][0] == '+'); |
| 342 |
break; |
| 343 |
case 't': |
| 344 |
switch (argv[i][2]) { |
| 345 |
case '3': |
| 346 |
single_plane_incident = 1; |
| 347 |
break; |
| 348 |
case '4': |
| 349 |
single_plane_incident = 0; |
| 350 |
break; |
| 351 |
case '\0': |
| 352 |
pctcull = atof(argv[++i]); |
| 353 |
break; |
| 354 |
default: |
| 355 |
goto userr; |
| 356 |
} |
| 357 |
break; |
| 358 |
case 'g': |
| 359 |
samp_order = atoi(argv[++i]); |
| 360 |
break; |
| 361 |
case 'l': |
| 362 |
lobe_lim = atoi(argv[++i]); |
| 363 |
break; |
| 364 |
default: |
| 365 |
goto userr; |
| 366 |
} |
| 367 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
| 368 |
void (*evf)(char *s) = single_plane_incident ? |
| 369 |
&eval_isotropic : &eval_anisotropic; |
| 370 |
if (i != argc-1 || fundefined(argv[i]) < 3) { |
| 371 |
fprintf(stderr, |
| 372 |
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
| 373 |
progname); |
| 374 |
fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n", |
| 375 |
progname); |
| 376 |
goto userr; |
| 377 |
} |
| 378 |
++eclock; |
| 379 |
xml_prologue(argc, argv); /* start XML output */ |
| 380 |
if (dofwd) { |
| 381 |
input_orient = -1; |
| 382 |
output_orient = -1; |
| 383 |
(*evf)(argv[i]); /* outside reflectance */ |
| 384 |
output_orient = 1; |
| 385 |
(*evf)(argv[i]); /* outside -> inside */ |
| 386 |
} |
| 387 |
if (dobwd) { |
| 388 |
input_orient = 1; |
| 389 |
output_orient = 1; |
| 390 |
(*evf)(argv[i]); /* inside reflectance */ |
| 391 |
output_orient = -1; |
| 392 |
(*evf)(argv[i]); /* inside -> outside */ |
| 393 |
} |
| 394 |
xml_epilogue(); /* finish XML output & exit */ |
| 395 |
return(0); |
| 396 |
} |
| 397 |
if (i < argc) { /* open input files if given */ |
| 398 |
int nbsdf = 0; |
| 399 |
for ( ; i < argc; i++) { /* interpolate each component */ |
| 400 |
FILE *fpin = fopen(argv[i], "rb"); |
| 401 |
if (fpin == NULL) { |
| 402 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
| 403 |
progname, argv[i]); |
| 404 |
return(1); |
| 405 |
} |
| 406 |
if (!load_bsdf_rep(fpin)) |
| 407 |
return(1); |
| 408 |
fclose(fpin); |
| 409 |
if (!nbsdf++) /* start XML on first dist. */ |
| 410 |
xml_prologue(argc, argv); |
| 411 |
if (single_plane_incident) |
| 412 |
eval_isotropic(NULL); |
| 413 |
else |
| 414 |
eval_anisotropic(NULL); |
| 415 |
} |
| 416 |
xml_epilogue(); /* finish XML output & exit */ |
| 417 |
return(0); |
| 418 |
} |
| 419 |
SET_FILE_BINARY(stdin); /* load from stdin */ |
| 420 |
if (!load_bsdf_rep(stdin)) |
| 421 |
return(1); |
| 422 |
xml_prologue(argc, argv); /* start XML output */ |
| 423 |
if (single_plane_incident) /* resample dist. */ |
| 424 |
eval_isotropic(NULL); |
| 425 |
else |
| 426 |
eval_anisotropic(NULL); |
| 427 |
xml_epilogue(); /* finish XML output & exit */ |
| 428 |
return(0); |
| 429 |
userr: |
| 430 |
fprintf(stderr, |
| 431 |
"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n", |
| 432 |
progname); |
| 433 |
fprintf(stderr, |
| 434 |
" or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
| 435 |
progname); |
| 436 |
return(1); |
| 437 |
} |
