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root/radiance/ray/src/cv/bsdf2klems.c
Revision: 2.6
Committed: Sat Jun 29 21:03:25 2013 UTC (10 years, 9 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.5: +3 -1 lines
Log Message:
Fixed problem with acos(1) returning NaN

File Contents

# User Rev Content
1 greg 2.1 #ifndef lint
2 greg 2.6 static const char RCSid[] = "$Id: bsdf2klems.c,v 2.5 2013/04/25 03:14:52 greg Exp $";
3 greg 2.1 #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 greg 2.4 /* assumed maximum # Klems patches */
21     #define MAXPATCHES 145
22 greg 2.1 /* global argv[0] */
23     char *progname;
24     /* selected basis function name */
25     static const char *kbasis = "LBNL/Klems Full";
26     /* number of BSDF samples per patch */
27     static int npsamps = 256;
28    
29     /* Return angle basis corresponding to the given name */
30     ANGLE_BASIS *
31     get_basis(const char *bn)
32     {
33     int n = nabases;
34    
35     while (n-- > 0)
36     if (!strcasecmp(bn, abase_list[n].name))
37     return &abase_list[n];
38     return NULL;
39     }
40    
41 greg 2.3 /* Output XML header to stdout */
42     static void
43     xml_header(int ac, char *av[])
44     {
45     puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
46     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\">");
47     fputs("<!-- File produced by:", stdout);
48     while (ac-- > 0) {
49     fputc(' ', stdout);
50     fputs(*av++, stdout);
51     }
52     puts(" -->");
53     }
54    
55 greg 2.1 /* Output XML prologue to stdout */
56     static void
57 greg 2.3 xml_prologue(const SDData *sd)
58 greg 2.1 {
59 greg 2.3 const char *matn = (sd && sd->matn[0]) ? sd->matn : "Name";
60     const char *makr = (sd && sd->makr[0]) ? sd->makr : "Manufacturer";
61 greg 2.1 ANGLE_BASIS *abp = get_basis(kbasis);
62     int i;
63    
64     if (abp == NULL) {
65     fprintf(stderr, "%s: unknown angle basis '%s'\n", progname, kbasis);
66     exit(1);
67     }
68     puts("<WindowElementType>System</WindowElementType>");
69     puts("<FileType>BSDF</FileType>");
70     puts("<Optical>");
71     puts("<Layer>");
72     puts("\t<Material>");
73 greg 2.3 printf("\t\t<Name>%s</Name>\n", matn);
74     printf("\t\t<Manufacturer>%s</Manufacturer>\n", makr);
75     if (sd && sd->dim[2] > .001) {
76     printf("\t\t<Thickness unit=\"meter\">%.3f</Thickness>\n", sd->dim[2]);
77     printf("\t\t<Width unit=\"meter\">%.3f</Width>\n", sd->dim[0]);
78     printf("\t\t<Height unit=\"meter\">%.3f</Height>\n", sd->dim[1]);
79     }
80 greg 2.1 puts("\t\t<DeviceType>Other</DeviceType>");
81     puts("\t</Material>");
82 greg 2.3 if (sd && sd->mgf != NULL) {
83     puts("\t<Geometry format=\"MGF\">");
84     puts("\t\t<MGFblock unit=\"meter\">");
85     fputs(sd->mgf, stdout);
86     puts("</MGFblock>");
87     puts("\t</Geometry>");
88     }
89 greg 2.1 puts("\t<DataDefinition>");
90     puts("\t\t<IncidentDataStructure>Columns</IncidentDataStructure>");
91     puts("\t\t<AngleBasis>");
92     printf("\t\t\t<AngleBasisName>%s</AngleBasisName>\n", kbasis);
93     for (i = 0; abp->lat[i].nphis; i++) {
94     puts("\t\t\t<AngleBasisBlock>");
95     printf("\t\t\t<Theta>%g</Theta>\n", i ?
96     .5*(abp->lat[i].tmin + abp->lat[i+1].tmin) :
97     .0 );
98 greg 2.3 printf("\t\t\t<nPhis>%d</nPhis>\n", abp->lat[i].nphis);
99 greg 2.1 puts("\t\t\t<ThetaBounds>");
100     printf("\t\t\t\t<LowerTheta>%g</LowerTheta>\n", abp->lat[i].tmin);
101     printf("\t\t\t\t<UpperTheta>%g</UpperTheta>\n", abp->lat[i+1].tmin);
102     puts("\t\t\t</ThetaBounds>");
103     puts("\t\t\t</AngleBasisBlock>");
104     }
105     puts("\t\t</AngleBasis>");
106     puts("\t</DataDefinition>");
107     }
108    
109     /* Output XML data prologue to stdout */
110     static void
111     data_prologue()
112     {
113     static const char *bsdf_type[4] = {
114     "Reflection Front",
115     "Transmission Front",
116     "Transmission Back",
117     "Reflection Back"
118     };
119    
120     puts("\t<WavelengthData>");
121     puts("\t\t<LayerNumber>System</LayerNumber>");
122     puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
123     puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
124     puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
125     puts("\t\t<WavelengthDataBlock>");
126     printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
127     bsdf_type[(input_orient>0)<<1 | (output_orient>0)]);
128     printf("\t\t\t<ColumnAngleBasis>%s</ColumnAngleBasis>\n", kbasis);
129     printf("\t\t\t<RowAngleBasis>%s</RowAngleBasis>\n", kbasis);
130     puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
131     puts("\t\t\t<ScatteringData>");
132     }
133    
134     /* Output XML data epilogue to stdout */
135     static void
136     data_epilogue(void)
137     {
138     puts("\t\t\t</ScatteringData>");
139     puts("\t\t</WavelengthDataBlock>");
140     puts("\t</WavelengthData>");
141     }
142    
143     /* Output XML epilogue to stdout */
144     static void
145     xml_epilogue(void)
146     {
147     puts("</Layer>");
148     puts("</Optical>");
149     puts("</WindowElement>");
150     }
151    
152 greg 2.2 /* Load and resample XML BSDF description using Klems basis */
153 greg 2.1 static void
154     eval_bsdf(const char *fname)
155     {
156     ANGLE_BASIS *abp = get_basis(kbasis);
157     SDData bsd;
158     SDError ec;
159     FVECT vin, vout;
160     SDValue sv;
161     double sum;
162     int i, j, n;
163    
164     SDclearBSDF(&bsd, fname); /* load BSDF file */
165     if ((ec = SDloadFile(&bsd, fname)) != SDEnone)
166     goto err;
167 greg 2.3 xml_prologue(&bsd); /* pass geometry */
168 greg 2.1 /* front reflection */
169     if (bsd.rf != NULL || bsd.rLambFront.cieY > .002) {
170     input_orient = 1; output_orient = 1;
171     data_prologue();
172     for (j = 0; j < abp->nangles; j++) {
173     for (i = 0; i < abp->nangles; i++) {
174     sum = 0; /* average over patches */
175     for (n = npsamps; n-- > 0; ) {
176     fo_getvec(vout, j+(n+frandom())/npsamps, abp);
177 greg 2.5 fi_getvec(vin, i+urand(n), abp);
178 greg 2.1 ec = SDevalBSDF(&sv, vout, vin, &bsd);
179     if (ec != SDEnone)
180     goto err;
181     sum += sv.cieY;
182     }
183     printf("\t%.3e\n", sum/npsamps);
184     }
185     putchar('\n'); /* extra space between rows */
186     }
187     data_epilogue();
188     }
189     /* back reflection */
190     if (bsd.rb != NULL || bsd.rLambBack.cieY > .002) {
191     input_orient = -1; output_orient = -1;
192     data_prologue();
193     for (j = 0; j < abp->nangles; j++) {
194     for (i = 0; i < abp->nangles; i++) {
195     sum = 0; /* average over patches */
196     for (n = npsamps; n-- > 0; ) {
197     bo_getvec(vout, j+(n+frandom())/npsamps, abp);
198 greg 2.5 bi_getvec(vin, i+urand(n), abp);
199 greg 2.1 ec = SDevalBSDF(&sv, vout, vin, &bsd);
200     if (ec != SDEnone)
201     goto err;
202     sum += sv.cieY;
203     }
204     printf("\t%.3e\n", sum/npsamps);
205     }
206     putchar('\n'); /* extra space between rows */
207     }
208     data_epilogue();
209     }
210     /* front transmission */
211     if (bsd.tf != NULL || bsd.tLamb.cieY > .002) {
212     input_orient = 1; output_orient = -1;
213     data_prologue();
214     for (j = 0; j < abp->nangles; j++) {
215     for (i = 0; i < abp->nangles; i++) {
216     sum = 0; /* average over patches */
217     for (n = npsamps; n-- > 0; ) {
218     bo_getvec(vout, j+(n+frandom())/npsamps, abp);
219 greg 2.5 fi_getvec(vin, i+urand(n), abp);
220 greg 2.1 ec = SDevalBSDF(&sv, vout, vin, &bsd);
221     if (ec != SDEnone)
222     goto err;
223     sum += sv.cieY;
224     }
225     printf("\t%.3e\n", sum/npsamps);
226     }
227     putchar('\n'); /* extra space between rows */
228     }
229     data_epilogue();
230     }
231     /* back transmission */
232     if (bsd.tb != NULL) {
233     input_orient = -1; output_orient = 1;
234     data_prologue();
235     for (j = 0; j < abp->nangles; j++) {
236     for (i = 0; i < abp->nangles; i++) {
237     sum = 0; /* average over patches */
238     for (n = npsamps; n-- > 0; ) {
239     fo_getvec(vout, j+(n+frandom())/npsamps, abp);
240 greg 2.5 bi_getvec(vin, i+urand(n), abp);
241 greg 2.1 ec = SDevalBSDF(&sv, vout, vin, &bsd);
242     if (ec != SDEnone)
243     goto err;
244     sum += sv.cieY;
245     }
246     printf("\t%.3e\n", sum/npsamps);
247     }
248     putchar('\n'); /* extra space between rows */
249     }
250     data_epilogue();
251     }
252     SDfreeBSDF(&bsd); /* all done */
253     return;
254     err:
255     SDreportError(ec, stderr);
256     exit(1);
257     }
258    
259 greg 2.2 /* Interpolate and output a BSDF function using Klems basis */
260 greg 2.1 static void
261     eval_function(char *funame)
262     {
263     ANGLE_BASIS *abp = get_basis(kbasis);
264     double iovec[6];
265     double sum;
266     int i, j, n;
267    
268 greg 2.4 initurand(npsamps);
269 greg 2.1 data_prologue(); /* begin output */
270     for (j = 0; j < abp->nangles; j++) { /* run through directions */
271     for (i = 0; i < abp->nangles; i++) {
272     sum = 0;
273     for (n = npsamps; n--; ) { /* average over patches */
274     if (output_orient > 0)
275     fo_getvec(iovec+3, j+(n+frandom())/npsamps, abp);
276     else
277     bo_getvec(iovec+3, j+(n+frandom())/npsamps, abp);
278    
279     if (input_orient > 0)
280 greg 2.4 fi_getvec(iovec, i+urand(n), abp);
281 greg 2.1 else
282 greg 2.4 bi_getvec(iovec, i+urand(n), abp);
283 greg 2.1
284     sum += funvalue(funame, 6, iovec);
285     }
286     printf("\t%.3e\n", sum/npsamps);
287     }
288     putchar('\n');
289     }
290     data_epilogue(); /* finish output */
291     }
292    
293     /* Interpolate and output a radial basis function BSDF representation */
294     static void
295     eval_rbf(void)
296     {
297     ANGLE_BASIS *abp = get_basis(kbasis);
298 greg 2.2 float bsdfarr[MAXPATCHES*MAXPATCHES];
299     FVECT vin, vout;
300     RBFNODE *rbf;
301 greg 2.1 double sum;
302     int i, j, n;
303 greg 2.2 /* sanity check */
304     if (abp->nangles > MAXPATCHES) {
305     fprintf(stderr, "%s: too many patches!\n", progname);
306     exit(1);
307     }
308     data_prologue(); /* begin output */
309     for (i = 0; i < abp->nangles; i++) {
310     if (input_orient > 0) /* use incident patch center */
311     fi_getvec(vin, i+.5*(i>0), abp);
312     else
313     bi_getvec(vin, i+.5*(i>0), abp);
314    
315     rbf = advect_rbf(vin); /* compute radial basis func */
316    
317     for (j = 0; j < abp->nangles; j++) {
318     sum = 0; /* sample over exiting patch */
319     for (n = npsamps; n--; ) {
320     if (output_orient > 0)
321     fo_getvec(vout, j+(n+frandom())/npsamps, abp);
322     else
323     bo_getvec(vout, j+(n+frandom())/npsamps, abp);
324 greg 2.1
325 greg 2.2 sum += eval_rbfrep(rbf, vout) / vout[2];
326     }
327     bsdfarr[j*abp->nangles + i] = sum*output_orient/npsamps;
328     }
329 greg 2.6 if (rbf != NULL)
330     free(rbf);
331 greg 2.2 }
332     n = 0; /* write out our matrix */
333     for (j = 0; j < abp->nangles; j++) {
334     for (i = 0; i < abp->nangles; i++)
335     printf("\t%.3e\n", bsdfarr[n++]);
336     putchar('\n');
337     }
338     data_epilogue(); /* finish output */
339 greg 2.1 }
340    
341     /* Read in BSDF and interpolate as Klems matrix representation */
342     int
343     main(int argc, char *argv[])
344     {
345     int dofwd = 0, dobwd = 1;
346     char *cp;
347     int i, na;
348    
349     progname = argv[0];
350     esupport |= E_VARIABLE|E_FUNCTION|E_RCONST;
351     esupport &= ~(E_INCHAN|E_OUTCHAN);
352     scompile("PI:3.14159265358979323846", NULL, 0);
353     biggerlib();
354 greg 2.2 for (i = 1; i < argc && (argv[i][0] == '-') | (argv[i][0] == '+'); i++)
355 greg 2.1 switch (argv[i][1]) { /* get options */
356     case 'n':
357     npsamps = atoi(argv[++i]);
358     if (npsamps <= 0)
359     goto userr;
360     break;
361     case 'e':
362     scompile(argv[++i], NULL, 0);
363     single_plane_incident = 0;
364     break;
365     case 'f':
366     if (!argv[i][2]) {
367     fcompile(argv[++i]);
368     single_plane_incident = 0;
369     } else
370     dofwd = (argv[i][0] == '+');
371     break;
372     case 'b':
373     dobwd = (argv[i][0] == '+');
374     break;
375     case 'h':
376     kbasis = "LBNL/Klems Half";
377     break;
378     case 'q':
379     kbasis = "LBNL/Klems Quarter";
380     break;
381     default:
382     goto userr;
383     }
384     if (single_plane_incident >= 0) { /* function-based BSDF? */
385     if (i != argc-1 || fundefined(argv[i]) != 6) {
386     fprintf(stderr,
387     "%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
388     progname);
389     goto userr;
390     }
391 greg 2.3 xml_header(argc, argv); /* start XML output */
392     xml_prologue(NULL);
393 greg 2.1 if (dofwd) {
394     input_orient = -1;
395     output_orient = -1;
396     eval_function(argv[i]); /* outside reflectance */
397     output_orient = 1;
398     eval_function(argv[i]); /* outside -> inside */
399     }
400     if (dobwd) {
401     input_orient = 1;
402     output_orient = 1;
403     eval_function(argv[i]); /* inside reflectance */
404     output_orient = -1;
405     eval_function(argv[i]); /* inside -> outside */
406     }
407     xml_epilogue(); /* finish XML output & exit */
408     return(0);
409     }
410 greg 2.2 /* XML input? */
411     if (i == argc-1 && (cp = argv[i]+strlen(argv[i])-4) > argv[i] &&
412     !strcasecmp(cp, ".xml")) {
413 greg 2.3 xml_header(argc, argv); /* start XML output */
414 greg 2.1 eval_bsdf(argv[i]); /* load & resample BSDF */
415     xml_epilogue(); /* finish XML output & exit */
416     return(0);
417     }
418     if (i < argc) { /* open input files if given */
419     int nbsdf = 0;
420     for ( ; i < argc; i++) { /* interpolate each component */
421     FILE *fpin = fopen(argv[i], "rb");
422     if (fpin == NULL) {
423     fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
424     progname, argv[i]);
425     return(1);
426     }
427     if (!load_bsdf_rep(fpin))
428     return(1);
429     fclose(fpin);
430 greg 2.3 if (!nbsdf++) { /* start XML on first dist. */
431     xml_header(argc, argv);
432     xml_prologue(NULL);
433     }
434 greg 2.1 eval_rbf();
435     }
436     xml_epilogue(); /* finish XML output & exit */
437     return(0);
438     }
439     SET_FILE_BINARY(stdin); /* load from stdin */
440     if (!load_bsdf_rep(stdin))
441     return(1);
442 greg 2.3 xml_header(argc, argv); /* start XML output */
443     xml_prologue(NULL);
444 greg 2.1 eval_rbf(); /* resample dist. */
445     xml_epilogue(); /* finish XML output & exit */
446     return(0);
447     userr:
448     fprintf(stderr,
449 greg 2.3 "Usage: %s [-n spp][-h|-q][bsdf.sir ..] > bsdf.xml\n", progname);
450 greg 2.1 fprintf(stderr,
451 greg 2.3 " or: %s [-n spp][-h|-q] bsdf_in.xml > bsdf_out.xml\n", progname);
452 greg 2.1 fprintf(stderr,
453     " or: %s [-n spp][-h|-q][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
454     progname);
455     return(1);
456     }