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root/radiance/ray/src/cv/bsdf2ttree.c
Revision: 2.47
Committed: Thu May 7 02:36:37 2020 UTC (4 years ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.46: +113 -33 lines
Log Message: 
Various improvements to adaptive sampling method

File Contents

# User Rev Content
1 greg 2.1 #ifndef lint
2 greg 2.47 static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.46 2020/05/06 02:28:21 greg Exp $";
3 greg 2.1 #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 <stdlib.h>
12     #include <math.h>
13 greg 2.23 #include "random.h"
14 greg 2.1 #include "platform.h"
15 greg 2.34 #include "paths.h"
16     #include "rtio.h"
17 greg 2.11 #include "calcomp.h"
18 greg 2.1 #include "bsdfrep.h"
19     /* global argv[0] */
20     char *progname;
21 greg 2.41 /* reciprocity averaging option */
22     static const char *recip = " -a";
23 greg 2.1 /* percentage to cull (<0 to turn off) */
24 greg 2.31 static double pctcull = 90.;
25 greg 2.1 /* sampling order */
26 greg 2.31 static int samp_order = 6;
27 greg 2.15 /* super-sampling threshold */
28 greg 2.47 const double ssamp_thresh = 0.30;
29 greg 2.15 /* number of super-samples */
30 greg 2.28 #ifndef NSSAMP
31 greg 2.46 #define NSSAMP 256
32 greg 2.28 #endif
33 greg 2.18 /* limit on number of RBF lobes */
34     static int lobe_lim = 15000;
35 greg 2.26 /* progress bar length */
36     static int do_prog = 79;
37    
38 greg 2.34 #define MAXCARG 512 /* wrapBSDF command */
39     static char *wrapBSDF[MAXCARG] = {"wrapBSDF", "-U"};
40     static int wbsdfac = 2;
41    
42 greg 2.39 /* Add argument to wrapBSDF, allocating space if !isstatic */
43 greg 2.34 static void
44     add_wbsdf(const char *arg, int isstatic)
45     {
46     if (arg == NULL)
47     return;
48     if (wbsdfac >= MAXCARG-1) {
49     fputs(progname, stderr);
50     fputs(": too many command arguments to wrapBSDF\n", stderr);
51     exit(1);
52     }
53     if (!*arg)
54     arg = "";
55     else if (!isstatic)
56     arg = savqstr((char *)arg);
57    
58     wrapBSDF[wbsdfac++] = (char *)arg;
59     }
60    
61     /* Create Yuv component file and add appropriate arguments */
62     static char *
63     create_component_file(int c)
64     {
65     static const char sname[3][6] = {"CIE-Y", "CIE-u", "CIE-v"};
66     static const char cname[4][4] = {"-rf", "-tf", "-tb", "-rb"};
67     char *tfname = mktemp(savqstr(TEMPLATE));
68    
69     add_wbsdf("-s", 1); add_wbsdf(sname[c], 1);
70     add_wbsdf(cname[(input_orient>0)<<1 | (output_orient>0)], 1);
71     add_wbsdf(tfname, 1);
72     return(tfname);
73     }
74 greg 2.26
75     /* Start new progress bar */
76     #define prog_start(s) if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else
77    
78     /* Draw progress bar of the appropriate length */
79     static void
80     prog_show(double frac)
81     {
82 greg 2.30 static unsigned call_cnt = 0;
83     static char lastc[] = "-\\|/";
84     char pbar[256];
85     int nchars;
86 greg 2.26
87 greg 2.30 if (do_prog <= 1) return;
88 greg 2.26 if (do_prog > sizeof(pbar)-2)
89     do_prog = sizeof(pbar)-2;
90     if (frac < 0) frac = 0;
91 greg 2.30 else if (frac >= 1) frac = .9999;
92     nchars = do_prog*frac;
93 greg 2.26 pbar[0] = '\r';
94     memset(pbar+1, '*', nchars);
95 greg 2.30 pbar[nchars+1] = lastc[call_cnt++ & 3];
96     memset(pbar+2+nchars, '-', do_prog-nchars-1);
97 greg 2.26 pbar[do_prog+1] = '\0';
98     fputs(pbar, stderr);
99     }
100    
101     /* Finish progress bar */
102 greg 2.27 static void
103     prog_done(void)
104     {
105     int n = do_prog;
106    
107     if (n <= 1) return;
108     fputc('\r', stderr);
109     while (n--)
110     fputc(' ', stderr);
111     fputc('\r', stderr);
112     }
113 greg 2.1
114 greg 2.15 /* Compute absolute relative difference */
115     static double
116     abs_diff(double v1, double v0)
117     {
118     if ((v0 < 0) | (v1 < 0))
119     return(.0);
120     v1 = (v1-v0)*2./(v0+v1+.0001);
121     if (v1 < 0)
122     return(-v1);
123     return(v1);
124     }
125    
126 greg 2.1 /* Interpolate and output isotropic BSDF data */
127     static void
128 greg 2.11 eval_isotropic(char *funame)
129 greg 2.1 {
130     const int sqres = 1<<samp_order;
131 greg 2.42 const double sqfact = 1./(double)sqres;
132 greg 2.47 float *ryval = NULL;
133     char *rtrip = NULL;
134 greg 2.34 FILE *ofp, *uvfp[2];
135 greg 2.17 int assignD = 0;
136 greg 2.1 char cmd[128];
137     int ix, ox, oy;
138 greg 2.11 double iovec[6];
139 greg 2.34 float bsdf, uv[2];
140 greg 2.15
141 greg 2.11 if (pctcull >= 0) {
142 greg 2.41 sprintf(cmd, "rttree_reduce%s -h -ff -r 3 -t %f -g %d > %s",
143     recip, pctcull, samp_order, create_component_file(0));
144 greg 2.1 ofp = popen(cmd, "w");
145     if (ofp == NULL) {
146     fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
147     progname);
148     exit(1);
149     }
150     SET_FILE_BINARY(ofp);
151 greg 2.25 #ifdef getc_unlocked /* avoid lock/unlock overhead */
152     flockfile(ofp);
153     #endif
154 greg 2.34 if (rbf_colorimetry == RBCtristimulus) {
155     double uvcull = 100. - (100.-pctcull)*.25;
156 greg 2.41 sprintf(cmd, "rttree_reduce%s -h -ff -r 3 -t %f -g %d > %s",
157     recip, uvcull, samp_order, create_component_file(1));
158 greg 2.34 uvfp[0] = popen(cmd, "w");
159 greg 2.41 sprintf(cmd, "rttree_reduce%s -h -ff -r 3 -t %f -g %d > %s",
160     recip, uvcull, samp_order, create_component_file(2));
161 greg 2.34 uvfp[1] = popen(cmd, "w");
162     if ((uvfp[0] == NULL) | (uvfp[1] == NULL)) {
163     fprintf(stderr, "%s: cannot open pipes to uv output\n",
164     progname);
165     exit(1);
166     }
167     SET_FILE_BINARY(uvfp[0]); SET_FILE_BINARY(uvfp[1]);
168     #ifdef getc_unlocked
169     flockfile(uvfp[0]); flockfile(uvfp[1]);
170     #endif
171     }
172     } else {
173     ofp = fopen(create_component_file(0), "w");
174     if (ofp == NULL) {
175     fprintf(stderr, "%s: cannot create Y output file\n",
176     progname);
177     exit(1);
178     }
179     fputs("{\n", ofp);
180     if (rbf_colorimetry == RBCtristimulus) {
181     uvfp[0] = fopen(create_component_file(1), "w");
182     uvfp[1] = fopen(create_component_file(2), "w");
183     if ((uvfp[0] == NULL) | (uvfp[1] == NULL)) {
184     fprintf(stderr, "%s: cannot create uv output file(s)\n",
185     progname);
186     exit(1);
187     }
188     fputs("{\n", uvfp[0]);
189     fputs("{\n", uvfp[1]);
190     }
191     }
192 greg 2.35 if (funame != NULL) /* need to assign Dx, Dy, Dz? */
193 greg 2.17 assignD = (fundefined(funame) < 6);
194 greg 2.47 #if (NSSAMP > 0)
195     rtrip = (char *)calloc(sqres, 1); /* track sample triggerings */
196     ryval = (float *)calloc(sqres, sizeof(float));
197     #endif
198 greg 2.1 /* run through directions */
199     for (ix = 0; ix < sqres/2; ix++) {
200 greg 2.45 const int zipsgn = (ix & 1)*2 - 1;
201     RBFNODE *rbf = NULL;
202 greg 2.42 iovec[0] = 2.*sqfact*(ix+.5) - 1.;
203 greg 2.45 iovec[1] = zipsgn*sqfact*.5;
204     iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]
205     - iovec[1]*iovec[1]);
206 greg 2.11 if (funame == NULL)
207 greg 2.18 rbf = advect_rbf(iovec, lobe_lim);
208 greg 2.15 for (ox = 0; ox < sqres; ox++) {
209 greg 2.47 SDValue sdv_next;
210     SDsquare2disk(iovec+3, (ox+.5)*sqfact, .5*sqfact);
211     iovec[5] = output_orient *
212     sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
213     if (funame == NULL) {
214     eval_rbfcol(&sdv_next, rbf, iovec+3);
215     } else {
216     sdv_next.spec = c_dfcolor;
217     if (assignD) {
218     varset("Dx", '=', -iovec[3]);
219     varset("Dy", '=', -iovec[4]);
220     varset("Dz", '=', -iovec[5]);
221     ++eclock;
222     }
223     sdv_next.cieY = funvalue(funame, 6, iovec);
224     }
225 greg 2.1 for (oy = 0; oy < sqres; oy++) {
226 greg 2.47 int trip;
227     bsdf = sdv_next.cieY; /* keeping one step ahead... */
228     if (oy < sqres-1) {
229     SDsquare2disk(iovec+3, (ox+.5)*sqfact, (oy+1.5)*sqfact);
230     iovec[5] = output_orient *
231 greg 2.11 sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
232 greg 2.47 }
233 greg 2.34 if (funame == NULL) {
234 greg 2.47 SDValue sdv = sdv_next;
235     if (oy < sqres-1)
236     eval_rbfcol(&sdv_next, rbf, iovec+3);
237 greg 2.42 #if (NSSAMP > 0)
238 greg 2.47 trip = (abs_diff(bsdf, sdv_next.cieY) > ssamp_thresh ||
239     (ox && abs_diff(bsdf, ryval[oy]) > ssamp_thresh) ||
240     (oy && abs_diff(bsdf, ryval[oy-1]) > ssamp_thresh));
241     if (trip | rtrip[oy] || (oy && rtrip[oy-1])) {
242 greg 2.42 int ssi;
243     double ssa[2], sum = 0, usum = 0, vsum = 0;
244     /* super-sample voxel */
245     for (ssi = NSSAMP; ssi--; ) {
246     SDmultiSamp(ssa, 2, (ssi+frandom()) *
247     (1./NSSAMP));
248     SDsquare2disk(iovec+3, (ox+ssa[0])*sqfact,
249     (oy+ssa[1])*sqfact);
250     iovec[5] = output_orient *
251     sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
252     eval_rbfcol(&sdv, rbf, iovec+3);
253     sum += sdv.cieY;
254     if (rbf_colorimetry == RBCtristimulus) {
255     sdv.cieY /=
256     -2.*sdv.spec.cx + 12.*sdv.spec.cy + 3.;
257     usum += 4.*sdv.spec.cx * sdv.cieY;
258     vsum += 9.*sdv.spec.cy * sdv.cieY;
259     }
260     }
261     bsdf = sum * (1./NSSAMP);
262     if (rbf_colorimetry == RBCtristimulus) {
263     uv[0] = usum / (sum+FTINY);
264     uv[1] = vsum / (sum+FTINY);
265     }
266     } else
267     #endif
268 greg 2.34 if (rbf_colorimetry == RBCtristimulus) {
269     uv[0] = uv[1] = 1. /
270     (-2.*sdv.spec.cx + 12.*sdv.spec.cy + 3.);
271     uv[0] *= 4.*sdv.spec.cx;
272     uv[1] *= 9.*sdv.spec.cy;
273     }
274     } else {
275 greg 2.47 if (oy < sqres-1) {
276     if (assignD) {
277     varset("Dx", '=', -iovec[3]);
278     varset("Dy", '=', -iovec[4]);
279     varset("Dz", '=', -iovec[5]);
280     ++eclock;
281     }
282     sdv_next.cieY = funvalue(funame, 6, iovec);
283 greg 2.17 }
284 greg 2.28 #if (NSSAMP > 0)
285 greg 2.47 trip = (abs_diff(bsdf, sdv_next.cieY) > ssamp_thresh ||
286     (ox && abs_diff(bsdf, ryval[oy]) > ssamp_thresh) ||
287     (oy && abs_diff(bsdf, ryval[oy-1]) > ssamp_thresh));
288     if (trip | rtrip[oy] || (oy && rtrip[oy-1])) {
289 greg 2.28 int ssi;
290 greg 2.45 double ssa[4], ssvec[6], sum = 0;
291 greg 2.28 /* super-sample voxel */
292     for (ssi = NSSAMP; ssi--; ) {
293 greg 2.45 SDmultiSamp(ssa, 4, (ssi+frandom()) *
294 greg 2.28 (1./NSSAMP));
295 greg 2.42 ssvec[0] = 2.*sqfact*(ix+ssa[0]) - 1.;
296 greg 2.45 ssvec[1] = zipsgn*sqfact*ssa[1];
297     ssvec[2] = 1. - ssvec[0]*ssvec[0]
298     - ssvec[1]*ssvec[1];
299     if (ssvec[2] < .0) {
300     ssvec[1] = 0;
301     ssvec[2] = 1. - ssvec[0]*ssvec[0];
302     }
303     ssvec[2] = input_orient * sqrt(ssvec[2]);
304     SDsquare2disk(ssvec+3, (ox+ssa[2])*sqfact,
305     (oy+ssa[3])*sqfact);
306 greg 2.15 ssvec[5] = output_orient *
307     sqrt(1. - ssvec[3]*ssvec[3] -
308     ssvec[4]*ssvec[4]);
309 greg 2.17 if (assignD) {
310 greg 2.28 varset("Dx", '=', -ssvec[3]);
311     varset("Dy", '=', -ssvec[4]);
312     varset("Dz", '=', -ssvec[5]);
313 greg 2.17 ++eclock;
314     }
315 greg 2.16 sum += funvalue(funame, 6, ssvec);
316 greg 2.15 }
317 greg 2.42 bsdf = sum * (1./NSSAMP);
318 greg 2.15 }
319 greg 2.28 #endif
320 greg 2.15 }
321 greg 2.1 if (pctcull >= 0)
322 greg 2.37 putbinary(&bsdf, sizeof(bsdf), 1, ofp);
323 greg 2.1 else
324 greg 2.34 fprintf(ofp, "\t%.3e\n", bsdf);
325    
326     if (rbf_colorimetry == RBCtristimulus) {
327     if (pctcull >= 0) {
328 greg 2.37 putbinary(&uv[0], sizeof(*uv), 1, uvfp[0]);
329     putbinary(&uv[1], sizeof(*uv), 1, uvfp[1]);
330 greg 2.34 } else {
331     fprintf(uvfp[0], "\t%.3e\n", uv[0]);
332     fprintf(uvfp[1], "\t%.3e\n", uv[1]);
333     }
334     }
335 greg 2.47 if (ryval != NULL) {
336     rtrip[oy] = trip;
337     ryval[oy] = bsdf;
338     }
339 greg 2.1 }
340 greg 2.15 }
341 greg 2.3 if (rbf != NULL)
342     free(rbf);
343 greg 2.42 prog_show((ix+1.)*(2.*sqfact));
344 greg 2.1 }
345 greg 2.35 prog_done();
346 greg 2.47 if (ryval != NULL) {
347     free(rtrip);
348     free(ryval);
349     }
350 greg 2.1 if (pctcull >= 0) { /* finish output */
351     if (pclose(ofp)) {
352 greg 2.34 fprintf(stderr, "%s: error running rttree_reduce on Y\n",
353     progname);
354     exit(1);
355     }
356     if (rbf_colorimetry == RBCtristimulus &&
357     (pclose(uvfp[0]) || pclose(uvfp[1]))) {
358     fprintf(stderr, "%s: error running rttree_reduce on uv\n",
359     progname);
360 greg 2.1 exit(1);
361     }
362     } else {
363     for (ix = sqres*sqres*sqres/2; ix--; )
364 greg 2.34 fputs("\t0\n", ofp);
365     fputs("}\n", ofp);
366     if (fclose(ofp)) {
367     fprintf(stderr, "%s: error writing Y file\n",
368     progname);
369     exit(1);
370     }
371     if (rbf_colorimetry == RBCtristimulus) {
372     for (ix = sqres*sqres*sqres/2; ix--; ) {
373     fputs("\t0\n", uvfp[0]);
374     fputs("\t0\n", uvfp[1]);
375     }
376     fputs("}\n", uvfp[0]);
377     fputs("}\n", uvfp[1]);
378     if (fclose(uvfp[0]) || fclose(uvfp[1])) {
379     fprintf(stderr, "%s: error writing uv file(s)\n",
380     progname);
381     exit(1);
382     }
383     }
384 greg 2.1 }
385     }
386    
387     /* Interpolate and output anisotropic BSDF data */
388     static void
389 greg 2.11 eval_anisotropic(char *funame)
390 greg 2.1 {
391     const int sqres = 1<<samp_order;
392 greg 2.42 const double sqfact = 1./(double)sqres;
393 greg 2.47 float *ryval = NULL;
394     char *rtrip = NULL;
395 greg 2.34 FILE *ofp, *uvfp[2];
396 greg 2.17 int assignD = 0;
397 greg 2.1 char cmd[128];
398     int ix, iy, ox, oy;
399 greg 2.11 double iovec[6];
400 greg 2.34 float bsdf, uv[2];
401 greg 2.15
402 greg 2.11 if (pctcull >= 0) {
403 greg 2.35 const char *avgopt = (input_orient>0 ^ output_orient>0)
404 greg 2.41 ? "" : recip;
405 greg 2.34 sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d > %s",
406 greg 2.35 avgopt, pctcull, samp_order,
407     create_component_file(0));
408 greg 2.1 ofp = popen(cmd, "w");
409     if (ofp == NULL) {
410     fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
411     progname);
412     exit(1);
413     }
414 greg 2.25 SET_FILE_BINARY(ofp);
415     #ifdef getc_unlocked /* avoid lock/unlock overhead */
416     flockfile(ofp);
417     #endif
418 greg 2.34 if (rbf_colorimetry == RBCtristimulus) {
419     double uvcull = 100. - (100.-pctcull)*.25;
420     sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d > %s",
421 greg 2.35 avgopt, uvcull, samp_order,
422     create_component_file(1));
423 greg 2.34 uvfp[0] = popen(cmd, "w");
424     sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d > %s",
425 greg 2.35 avgopt, uvcull, samp_order,
426     create_component_file(2));
427 greg 2.34 uvfp[1] = popen(cmd, "w");
428     if ((uvfp[0] == NULL) | (uvfp[1] == NULL)) {
429     fprintf(stderr, "%s: cannot open pipes to uv output\n",
430     progname);
431     exit(1);
432     }
433     SET_FILE_BINARY(uvfp[0]); SET_FILE_BINARY(uvfp[1]);
434     #ifdef getc_unlocked
435     flockfile(uvfp[0]); flockfile(uvfp[1]);
436     #endif
437     }
438     } else {
439     ofp = fopen(create_component_file(0), "w");
440     if (ofp == NULL) {
441     fprintf(stderr, "%s: cannot create Y output file\n",
442     progname);
443     exit(1);
444     }
445     fputs("{\n", ofp);
446     if (rbf_colorimetry == RBCtristimulus) {
447     uvfp[0] = fopen(create_component_file(1), "w");
448     uvfp[1] = fopen(create_component_file(2), "w");
449     if ((uvfp[0] == NULL) | (uvfp[1] == NULL)) {
450     fprintf(stderr, "%s: cannot create uv output file(s)\n",
451     progname);
452     exit(1);
453     }
454     fputs("{\n", uvfp[0]);
455     fputs("{\n", uvfp[1]);
456     }
457     }
458 greg 2.35 if (funame != NULL) /* need to assign Dx, Dy, Dz? */
459 greg 2.17 assignD = (fundefined(funame) < 6);
460 greg 2.47 #if (NSSAMP > 0)
461     rtrip = (char *)calloc(sqres, 1); /* track sample triggerings */
462     ryval = (float *)calloc(sqres, sizeof(float));
463     #endif
464 greg 2.1 /* run through directions */
465     for (ix = 0; ix < sqres; ix++)
466     for (iy = 0; iy < sqres; iy++) {
467 greg 2.11 RBFNODE *rbf = NULL; /* Klems reversal */
468 greg 2.42 SDsquare2disk(iovec, 1.-(ix+.5)*sqfact, 1.-(iy+.5)*sqfact);
469 greg 2.11 iovec[2] = input_orient *
470     sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]);
471     if (funame == NULL)
472 greg 2.18 rbf = advect_rbf(iovec, lobe_lim);
473 greg 2.15 for (ox = 0; ox < sqres; ox++) {
474 greg 2.47 SDValue sdv_next;
475     SDsquare2disk(iovec+3, (ox+.5)*sqfact, .5*sqfact);
476     iovec[5] = output_orient *
477     sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
478     if (funame == NULL) {
479     eval_rbfcol(&sdv_next, rbf, iovec+3);
480     } else {
481     sdv_next.spec = c_dfcolor;
482     if (assignD) {
483     varset("Dx", '=', -iovec[3]);
484     varset("Dy", '=', -iovec[4]);
485     varset("Dz", '=', -iovec[5]);
486     ++eclock;
487     }
488     sdv_next.cieY = funvalue(funame, 6, iovec);
489     }
490 greg 2.1 for (oy = 0; oy < sqres; oy++) {
491 greg 2.47 int trip;
492     bsdf = sdv_next.cieY; /* keeping one step ahead... */
493     if (oy < sqres-1) {
494     SDsquare2disk(iovec+3, (ox+.5)*sqfact, (oy+1.5)*sqfact);
495     iovec[5] = output_orient *
496 greg 2.11 sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
497 greg 2.47 }
498 greg 2.34 if (funame == NULL) {
499 greg 2.47 SDValue sdv = sdv_next;
500     if (oy < sqres-1)
501     eval_rbfcol(&sdv_next, rbf, iovec+3);
502 greg 2.42 #if (NSSAMP > 0)
503 greg 2.47 trip = (abs_diff(bsdf, sdv_next.cieY) > ssamp_thresh ||
504     (ox && abs_diff(bsdf, ryval[oy]) > ssamp_thresh) ||
505     (oy && abs_diff(bsdf, ryval[oy-1]) > ssamp_thresh));
506     if (trip | rtrip[oy] || (oy && rtrip[oy-1])) {
507 greg 2.42 int ssi;
508     double ssa[2], sum = 0, usum = 0, vsum = 0;
509     /* super-sample voxel */
510     for (ssi = NSSAMP; ssi--; ) {
511     SDmultiSamp(ssa, 2, (ssi+frandom()) *
512     (1./NSSAMP));
513     SDsquare2disk(iovec+3, (ox+ssa[0])*sqfact,
514     (oy+ssa[1])*sqfact);
515     iovec[5] = output_orient *
516     sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
517     eval_rbfcol(&sdv, rbf, iovec+3);
518     sum += sdv.cieY;
519     if (rbf_colorimetry == RBCtristimulus) {
520     sdv.cieY /=
521     -2.*sdv.spec.cx + 12.*sdv.spec.cy + 3.;
522     usum += 4.*sdv.spec.cx * sdv.cieY;
523     vsum += 9.*sdv.spec.cy * sdv.cieY;
524     }
525     }
526     bsdf = sum * (1./NSSAMP);
527     if (rbf_colorimetry == RBCtristimulus) {
528     uv[0] = usum / (sum+FTINY);
529     uv[1] = vsum / (sum+FTINY);
530     }
531     } else
532     #endif
533 greg 2.34 if (rbf_colorimetry == RBCtristimulus) {
534     uv[0] = uv[1] = 1. /
535     (-2.*sdv.spec.cx + 12.*sdv.spec.cy + 3.);
536     uv[0] *= 4.*sdv.spec.cx;
537     uv[1] *= 9.*sdv.spec.cy;
538     }
539     } else {
540 greg 2.47 if (oy < sqres-1) {
541     if (assignD) {
542     varset("Dx", '=', -iovec[3]);
543     varset("Dy", '=', -iovec[4]);
544     varset("Dz", '=', -iovec[5]);
545     ++eclock;
546     }
547     sdv_next.cieY = funvalue(funame, 6, iovec);
548 greg 2.17 }
549 greg 2.28 #if (NSSAMP > 0)
550 greg 2.47 trip = (abs_diff(bsdf, sdv_next.cieY) > ssamp_thresh ||
551     (ox && abs_diff(bsdf, ryval[oy]) > ssamp_thresh) ||
552     (oy && abs_diff(bsdf, ryval[oy-1]) > ssamp_thresh));
553     if (trip | rtrip[oy] || (oy && rtrip[oy-1])) {
554 greg 2.28 int ssi;
555     double ssa[4], ssvec[6], sum = 0;
556     /* super-sample voxel */
557     for (ssi = NSSAMP; ssi--; ) {
558     SDmultiSamp(ssa, 4, (ssi+frandom()) *
559     (1./NSSAMP));
560 greg 2.42 SDsquare2disk(ssvec, 1.-(ix+ssa[0])*sqfact,
561     1.-(iy+ssa[1])*sqfact);
562 greg 2.28 ssvec[2] = input_orient *
563 greg 2.15 sqrt(1. - ssvec[0]*ssvec[0] -
564     ssvec[1]*ssvec[1]);
565 greg 2.42 SDsquare2disk(ssvec+3, (ox+ssa[2])*sqfact,
566     (oy+ssa[3])*sqfact);
567 greg 2.15 ssvec[5] = output_orient *
568     sqrt(1. - ssvec[3]*ssvec[3] -
569     ssvec[4]*ssvec[4]);
570 greg 2.17 if (assignD) {
571 greg 2.28 varset("Dx", '=', -ssvec[3]);
572     varset("Dy", '=', -ssvec[4]);
573     varset("Dz", '=', -ssvec[5]);
574 greg 2.17 ++eclock;
575     }
576 greg 2.16 sum += funvalue(funame, 6, ssvec);
577 greg 2.15 }
578 greg 2.42 bsdf = sum * (1./NSSAMP);
579 greg 2.15 }
580 greg 2.28 #endif
581 greg 2.15 }
582 greg 2.1 if (pctcull >= 0)
583 greg 2.37 putbinary(&bsdf, sizeof(bsdf), 1, ofp);
584 greg 2.1 else
585 greg 2.34 fprintf(ofp, "\t%.3e\n", bsdf);
586    
587     if (rbf_colorimetry == RBCtristimulus) {
588     if (pctcull >= 0) {
589 greg 2.37 putbinary(&uv[0], sizeof(*uv), 1, uvfp[0]);
590     putbinary(&uv[1], sizeof(*uv), 1, uvfp[1]);
591 greg 2.34 } else {
592     fprintf(uvfp[0], "\t%.3e\n", uv[0]);
593     fprintf(uvfp[1], "\t%.3e\n", uv[1]);
594     }
595     }
596 greg 2.47 if (ryval != NULL) {
597     rtrip[oy] = trip;
598     ryval[oy] = bsdf;
599     }
600 greg 2.1 }
601 greg 2.3 if (rbf != NULL)
602     free(rbf);
603 greg 2.26 prog_show((ix*sqres+iy+1.)/(sqres*sqres));
604 greg 2.1 }
605 greg 2.47 }
606 greg 2.35 prog_done();
607 greg 2.47 if (ryval != NULL) {
608     free(rtrip);
609     free(ryval);
610     }
611 greg 2.1 if (pctcull >= 0) { /* finish output */
612     if (pclose(ofp)) {
613 greg 2.34 fprintf(stderr, "%s: error running rttree_reduce on Y\n",
614     progname);
615     exit(1);
616     }
617     if (rbf_colorimetry == RBCtristimulus &&
618     (pclose(uvfp[0]) || pclose(uvfp[1]))) {
619     fprintf(stderr, "%s: error running rttree_reduce on uv\n",
620     progname);
621 greg 2.1 exit(1);
622     }
623 greg 2.34 } else {
624     fputs("}\n", ofp);
625     if (fclose(ofp)) {
626     fprintf(stderr, "%s: error writing Y file\n",
627     progname);
628     exit(1);
629     }
630     if (rbf_colorimetry == RBCtristimulus) {
631     fputs("}\n", uvfp[0]);
632     fputs("}\n", uvfp[1]);
633     if (fclose(uvfp[0]) || fclose(uvfp[1])) {
634     fprintf(stderr, "%s: error writing uv file(s)\n",
635     progname);
636     exit(1);
637     }
638     }
639     }
640 greg 2.5 }
641    
642 schorsch 2.36 #if defined(_WIN32) || defined(_WIN64)
643 greg 2.34 /* Execute wrapBSDF command (may never return) */
644     static int
645     wrap_up(void)
646     {
647     char cmd[8192];
648    
649     if (bsdf_manuf[0]) {
650     add_wbsdf("-f", 1);
651     strcpy(cmd, "m=");
652     strcpy(cmd+2, bsdf_manuf);
653     add_wbsdf(cmd, 0);
654     }
655     if (bsdf_name[0]) {
656     add_wbsdf("-f", 1);
657     strcpy(cmd, "n=");
658     strcpy(cmd+2, bsdf_name);
659     add_wbsdf(cmd, 0);
660     }
661     if (!convert_commandline(cmd, sizeof(cmd), wrapBSDF)) {
662     fputs(progname, stderr);
663     fputs(": command line too long in wrap_up()\n", stderr);
664     return(1);
665     }
666     return(system(cmd));
667     }
668     #else
669     /* Execute wrapBSDF command (may never return) */
670     static int
671     wrap_up(void)
672     {
673     char buf[256];
674     char *compath = getpath((char *)wrapBSDF[0], getenv("PATH"), X_OK);
675    
676     if (compath == NULL) {
677     fprintf(stderr, "%s: cannot locate %s\n", progname, wrapBSDF[0]);
678     return(1);
679     }
680     if (bsdf_manuf[0]) {
681     add_wbsdf("-f", 1);
682     strcpy(buf, "m=");
683     strcpy(buf+2, bsdf_manuf);
684     add_wbsdf(buf, 0);
685     }
686     if (bsdf_name[0]) {
687     add_wbsdf("-f", 1);
688     strcpy(buf, "n=");
689     strcpy(buf+2, bsdf_name);
690     add_wbsdf(buf, 0);
691     }
692     execv(compath, wrapBSDF); /* successful call never returns */
693     perror(compath);
694     return(1);
695     }
696     #endif
697    
698 greg 2.1 /* Read in BSDF and interpolate as tensor tree representation */
699     int
700     main(int argc, char *argv[])
701     {
702 greg 2.34 static char tfmt[2][4] = {"t4", "t3"};
703 greg 2.11 int dofwd = 0, dobwd = 1;
704 greg 2.34 char buf[2048];
705 greg 2.11 int i, na;
706 greg 2.1
707 greg 2.5 progname = argv[0];
708 greg 2.11 esupport |= E_VARIABLE|E_FUNCTION|E_RCONST;
709     esupport &= ~(E_INCHAN|E_OUTCHAN);
710     scompile("PI:3.14159265358979323846", NULL, 0);
711     biggerlib();
712 greg 2.41 for (i = 1; i < argc && (argv[i][0] == '-') | (argv[i][0] == '+'); i++)
713 greg 2.11 switch (argv[i][1]) { /* get options */
714     case 'e':
715     scompile(argv[++i], NULL, 0);
716 greg 2.46 if (single_plane_incident < 0)
717     single_plane_incident = 0;
718 greg 2.11 break;
719     case 'f':
720 greg 2.34 if (!argv[i][2]) {
721     if (strchr(argv[++i], '=') != NULL) {
722     add_wbsdf("-f", 1);
723     add_wbsdf(argv[i], 1);
724 greg 2.43 } else {
725     char *fpath = getpath(argv[i],
726     getrlibpath(), 0);
727     if (fpath == NULL) {
728     fprintf(stderr,
729     "%s: cannot find file '%s'\n",
730     argv[0], argv[i]);
731     return(1);
732     }
733     fcompile(fpath);
734 greg 2.45 if (single_plane_incident < 0)
735     single_plane_incident = 0;
736 greg 2.43 }
737 greg 2.34 } else
738 greg 2.11 dofwd = (argv[i][0] == '+');
739     break;
740 greg 2.41 case 'a':
741     recip = (argv[i][0] == '+') ? " -a" : "";
742     break;
743 greg 2.11 case 'b':
744     dobwd = (argv[i][0] == '+');
745     break;
746 greg 2.1 case 't':
747 greg 2.11 switch (argv[i][2]) {
748     case '3':
749 greg 2.13 single_plane_incident = 1;
750 greg 2.11 break;
751     case '4':
752 greg 2.13 single_plane_incident = 0;
753 greg 2.11 break;
754     case '\0':
755     pctcull = atof(argv[++i]);
756     break;
757     default:
758     goto userr;
759     }
760 greg 2.1 break;
761     case 'g':
762 greg 2.5 samp_order = atoi(argv[++i]);
763 greg 2.1 break;
764 greg 2.18 case 'l':
765     lobe_lim = atoi(argv[++i]);
766     break;
767 greg 2.26 case 'p':
768     do_prog = atoi(argv[i]+2);
769     break;
770 greg 2.34 case 'W':
771     add_wbsdf(argv[i], 1);
772     break;
773     case 'u':
774     case 'C':
775     add_wbsdf(argv[i], 1);
776     add_wbsdf(argv[++i], 1);
777     break;
778 greg 2.1 default:
779     goto userr;
780     }
781 greg 2.34 strcpy(buf, "File produced by: ");
782     if (convert_commandline(buf+18, sizeof(buf)-18, argv) != NULL) {
783     add_wbsdf("-C", 1); add_wbsdf(buf, 0);
784     }
785 greg 2.11 if (single_plane_incident >= 0) { /* function-based BSDF? */
786     void (*evf)(char *s) = single_plane_incident ?
787 greg 2.34 eval_isotropic : eval_anisotropic;
788 greg 2.17 if (i != argc-1 || fundefined(argv[i]) < 3) {
789 greg 2.12 fprintf(stderr,
790     "%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
791     progname);
792 greg 2.24 fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
793 greg 2.11 goto userr;
794 greg 2.12 }
795 greg 2.17 ++eclock;
796 greg 2.34 add_wbsdf("-a", 1);
797     add_wbsdf(tfmt[single_plane_incident], 1);
798 greg 2.11 if (dofwd) {
799     input_orient = -1;
800     output_orient = -1;
801 greg 2.26 prog_start("Evaluating outside reflectance");
802     (*evf)(argv[i]);
803 greg 2.11 output_orient = 1;
804 greg 2.26 prog_start("Evaluating outside->inside transmission");
805     (*evf)(argv[i]);
806 greg 2.11 }
807     if (dobwd) {
808     input_orient = 1;
809     output_orient = 1;
810 greg 2.26 prog_start("Evaluating inside reflectance");
811     (*evf)(argv[i]);
812 greg 2.11 output_orient = -1;
813 greg 2.26 prog_start("Evaluating inside->outside transmission");
814     (*evf)(argv[i]);
815 greg 2.11 }
816 greg 2.34 return(wrap_up());
817 greg 2.11 }
818     if (i < argc) { /* open input files if given */
819 greg 2.12 int nbsdf = 0;
820 greg 2.11 for ( ; i < argc; i++) { /* interpolate each component */
821 greg 2.26 char pbuf[256];
822 greg 2.11 FILE *fpin = fopen(argv[i], "rb");
823     if (fpin == NULL) {
824     fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
825     progname, argv[i]);
826     return(1);
827     }
828     if (!load_bsdf_rep(fpin))
829     return(1);
830     fclose(fpin);
831 greg 2.26 sprintf(pbuf, "Interpolating component '%s'", argv[i]);
832     prog_start(pbuf);
833 greg 2.34 if (!nbsdf++) {
834     add_wbsdf("-a", 1);
835     add_wbsdf(tfmt[single_plane_incident], 1);
836     }
837 greg 2.11 if (single_plane_incident)
838     eval_isotropic(NULL);
839     else
840     eval_anisotropic(NULL);
841     }
842 greg 2.34 return(wrap_up());
843 greg 2.11 }
844     SET_FILE_BINARY(stdin); /* load from stdin */
845     if (!load_bsdf_rep(stdin))
846 greg 2.1 return(1);
847 greg 2.26 prog_start("Interpolating from standard input");
848 greg 2.34 add_wbsdf("-a", 1);
849     add_wbsdf(tfmt[single_plane_incident], 1);
850 greg 2.1 if (single_plane_incident) /* resample dist. */
851 greg 2.11 eval_isotropic(NULL);
852 greg 2.1 else
853 greg 2.11 eval_anisotropic(NULL);
854 greg 2.34
855     return(wrap_up());
856 greg 2.1 userr:
857     fprintf(stderr,
858 greg 2.41 "Usage: %s [{+|-}a][-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
859 greg 2.11 progname);
860     fprintf(stderr,
861 greg 2.41 " or: %s -t{3|4} [{+|-}a][-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
862 greg 2.1 progname);
863     return(1);
864     }