1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.31 2016/01/29 16:21:55 greg Exp $"; |
3 |
#endif |
4 |
/* |
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* Load measured BSDF interpolant and write out as XML file with tensor tree. |
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* |
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* G. Ward |
8 |
*/ |
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|
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#define _USE_MATH_DEFINES |
11 |
#include <stdio.h> |
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#include <stdlib.h> |
13 |
#include <math.h> |
14 |
#include "random.h" |
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#include "platform.h" |
16 |
#include "rtprocess.h" |
17 |
#include "calcomp.h" |
18 |
#include "bsdfrep.h" |
19 |
/* global argv[0] */ |
20 |
char *progname; |
21 |
/* percentage to cull (<0 to turn off) */ |
22 |
static double pctcull = 90.; |
23 |
/* sampling order */ |
24 |
static int samp_order = 6; |
25 |
/* super-sampling threshold */ |
26 |
const double ssamp_thresh = 0.35; |
27 |
/* number of super-samples */ |
28 |
#ifndef NSSAMP |
29 |
#define NSSAMP 100 |
30 |
#endif |
31 |
/* limit on number of RBF lobes */ |
32 |
static int lobe_lim = 15000; |
33 |
/* progress bar length */ |
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static int do_prog = 79; |
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|
36 |
|
37 |
|
38 |
/* Start new progress bar */ |
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#define prog_start(s) if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else |
40 |
|
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/* Draw progress bar of the appropriate length */ |
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static void |
43 |
prog_show(double frac) |
44 |
{ |
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static unsigned call_cnt = 0; |
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static char lastc[] = "-\\|/"; |
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char pbar[256]; |
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int nchars; |
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|
50 |
if (do_prog <= 1) return; |
51 |
if (do_prog > sizeof(pbar)-2) |
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do_prog = sizeof(pbar)-2; |
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if (frac < 0) frac = 0; |
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else if (frac >= 1) frac = .9999; |
55 |
nchars = do_prog*frac; |
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pbar[0] = '\r'; |
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memset(pbar+1, '*', nchars); |
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pbar[nchars+1] = lastc[call_cnt++ & 3]; |
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memset(pbar+2+nchars, '-', do_prog-nchars-1); |
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pbar[do_prog+1] = '\0'; |
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fputs(pbar, stderr); |
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} |
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|
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/* Finish progress bar */ |
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static void |
66 |
prog_done(void) |
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{ |
68 |
int n = do_prog; |
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|
70 |
if (n <= 1) return; |
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fputc('\r', stderr); |
72 |
while (n--) |
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fputc(' ', stderr); |
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fputc('\r', stderr); |
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} |
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|
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/* Compute absolute relative difference */ |
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static double |
79 |
abs_diff(double v1, double v0) |
80 |
{ |
81 |
if ((v0 < 0) | (v1 < 0)) |
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return(.0); |
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v1 = (v1-v0)*2./(v0+v1+.0001); |
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if (v1 < 0) |
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return(-v1); |
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return(v1); |
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} |
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|
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/* Interpolate and output isotropic BSDF data */ |
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static void |
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eval_isotropic(char *funame) |
92 |
{ |
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const int sqres = 1<<samp_order; |
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FILE *ofp = NULL; |
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int assignD = 0; |
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char cmd[128]; |
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int ix, ox, oy; |
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double iovec[6]; |
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float bsdf; |
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|
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data_prologue(); /* begin output */ |
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if (pctcull >= 0) { |
103 |
sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d", |
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pctcull, samp_order); |
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fflush(stdout); |
106 |
ofp = popen(cmd, "w"); |
107 |
if (ofp == NULL) { |
108 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
109 |
progname); |
110 |
exit(1); |
111 |
} |
112 |
SET_FILE_BINARY(ofp); |
113 |
#ifdef getc_unlocked /* avoid lock/unlock overhead */ |
114 |
flockfile(ofp); |
115 |
#endif |
116 |
} else |
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fputs("{\n", stdout); |
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/* need to assign Dx, Dy, Dz? */ |
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if (funame != NULL) |
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assignD = (fundefined(funame) < 6); |
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/* run through directions */ |
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for (ix = 0; ix < sqres/2; ix++) { |
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RBFNODE *rbf = NULL; |
124 |
iovec[0] = 2.*(ix+.5)/sqres - 1.; |
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iovec[1] = .0; |
126 |
iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]); |
127 |
if (funame == NULL) |
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rbf = advect_rbf(iovec, lobe_lim); |
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for (ox = 0; ox < sqres; ox++) { |
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float last_bsdf = -1; |
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for (oy = 0; oy < sqres; oy++) { |
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SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
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iovec[5] = output_orient * |
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sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
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if (funame == NULL) |
136 |
bsdf = eval_rbfrep(rbf, iovec+3); |
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else { |
138 |
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]); |
142 |
++eclock; |
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} |
144 |
bsdf = funvalue(funame, 6, iovec); |
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#if (NSSAMP > 0) |
146 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
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int ssi; |
148 |
double ssa[3], ssvec[6], sum = 0; |
149 |
/* super-sample voxel */ |
150 |
for (ssi = NSSAMP; ssi--; ) { |
151 |
SDmultiSamp(ssa, 3, (ssi+frandom()) * |
152 |
(1./NSSAMP)); |
153 |
ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.; |
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ssvec[1] = .0; |
155 |
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]); |
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if (assignD) { |
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varset("Dx", '=', -ssvec[3]); |
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varset("Dy", '=', -ssvec[4]); |
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varset("Dz", '=', -ssvec[5]); |
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++eclock; |
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} |
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sum += funvalue(funame, 6, ssvec); |
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} |
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bsdf = sum/NSSAMP; |
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} |
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#endif |
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} |
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if (pctcull >= 0) |
175 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
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else |
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printf("\t%.3e\n", bsdf); |
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last_bsdf = bsdf; |
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} |
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} |
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if (rbf != NULL) |
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free(rbf); |
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prog_show((ix+1.)*(2./sqres)); |
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} |
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if (pctcull >= 0) { /* finish output */ |
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if (pclose(ofp)) { |
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fprintf(stderr, "%s: error running '%s'\n", |
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progname, cmd); |
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exit(1); |
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} |
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} else { |
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for (ix = sqres*sqres*sqres/2; ix--; ) |
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fputs("\t0\n", stdout); |
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fputs("}\n", stdout); |
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} |
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data_epilogue(); |
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prog_done(); |
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} |
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|
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/* Interpolate and output anisotropic BSDF data */ |
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static void |
202 |
eval_anisotropic(char *funame) |
203 |
{ |
204 |
const int sqres = 1<<samp_order; |
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FILE *ofp = NULL; |
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int assignD = 0; |
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char cmd[128]; |
208 |
int ix, iy, ox, oy; |
209 |
double iovec[6]; |
210 |
float bsdf; |
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|
212 |
data_prologue(); /* begin output */ |
213 |
if (pctcull >= 0) { |
214 |
sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d", |
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(input_orient>0 ^ output_orient>0) ? "" : " -a", |
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pctcull, samp_order); |
217 |
fflush(stdout); |
218 |
ofp = popen(cmd, "w"); |
219 |
if (ofp == NULL) { |
220 |
fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n", |
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progname); |
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exit(1); |
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} |
224 |
SET_FILE_BINARY(ofp); |
225 |
#ifdef getc_unlocked /* avoid lock/unlock overhead */ |
226 |
flockfile(ofp); |
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#endif |
228 |
} else |
229 |
fputs("{\n", stdout); |
230 |
/* need to assign Dx, Dy, Dz? */ |
231 |
if (funame != NULL) |
232 |
assignD = (fundefined(funame) < 6); |
233 |
/* run through directions */ |
234 |
for (ix = 0; ix < sqres; ix++) |
235 |
for (iy = 0; iy < sqres; iy++) { |
236 |
RBFNODE *rbf = NULL; /* Klems reversal */ |
237 |
SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres); |
238 |
iovec[2] = input_orient * |
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sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]); |
240 |
if (funame == NULL) |
241 |
rbf = advect_rbf(iovec, lobe_lim); |
242 |
for (ox = 0; ox < sqres; ox++) { |
243 |
float last_bsdf = -1; |
244 |
for (oy = 0; oy < sqres; oy++) { |
245 |
SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres); |
246 |
iovec[5] = output_orient * |
247 |
sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]); |
248 |
if (funame == NULL) |
249 |
bsdf = eval_rbfrep(rbf, iovec+3); |
250 |
else { |
251 |
if (assignD) { |
252 |
varset("Dx", '=', -iovec[3]); |
253 |
varset("Dy", '=', -iovec[4]); |
254 |
varset("Dz", '=', -iovec[5]); |
255 |
++eclock; |
256 |
} |
257 |
bsdf = funvalue(funame, 6, iovec); |
258 |
#if (NSSAMP > 0) |
259 |
if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) { |
260 |
int ssi; |
261 |
double ssa[4], ssvec[6], sum = 0; |
262 |
/* super-sample voxel */ |
263 |
for (ssi = NSSAMP; ssi--; ) { |
264 |
SDmultiSamp(ssa, 4, (ssi+frandom()) * |
265 |
(1./NSSAMP)); |
266 |
SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres, |
267 |
1.-(iy+ssa[1])/sqres); |
268 |
ssvec[2] = input_orient * |
269 |
sqrt(1. - ssvec[0]*ssvec[0] - |
270 |
ssvec[1]*ssvec[1]); |
271 |
SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres, |
272 |
(oy+ssa[3])/sqres); |
273 |
ssvec[5] = output_orient * |
274 |
sqrt(1. - ssvec[3]*ssvec[3] - |
275 |
ssvec[4]*ssvec[4]); |
276 |
if (assignD) { |
277 |
varset("Dx", '=', -ssvec[3]); |
278 |
varset("Dy", '=', -ssvec[4]); |
279 |
varset("Dz", '=', -ssvec[5]); |
280 |
++eclock; |
281 |
} |
282 |
sum += funvalue(funame, 6, ssvec); |
283 |
} |
284 |
bsdf = sum/NSSAMP; |
285 |
} |
286 |
#endif |
287 |
} |
288 |
if (pctcull >= 0) |
289 |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
290 |
else |
291 |
printf("\t%.3e\n", bsdf); |
292 |
last_bsdf = bsdf; |
293 |
} |
294 |
} |
295 |
if (rbf != NULL) |
296 |
free(rbf); |
297 |
prog_show((ix*sqres+iy+1.)/(sqres*sqres)); |
298 |
} |
299 |
if (pctcull >= 0) { /* finish output */ |
300 |
if (pclose(ofp)) { |
301 |
fprintf(stderr, "%s: error running '%s'\n", |
302 |
progname, cmd); |
303 |
exit(1); |
304 |
} |
305 |
} else |
306 |
fputs("}\n", stdout); |
307 |
data_epilogue(); |
308 |
prog_done(); |
309 |
} |
310 |
|
311 |
/* Read in BSDF and interpolate as tensor tree representation */ |
312 |
int |
313 |
main(int argc, char *argv[]) |
314 |
{ |
315 |
int dofwd = 0, dobwd = 1; |
316 |
int i, na; |
317 |
|
318 |
progname = argv[0]; |
319 |
esupport |= E_VARIABLE|E_FUNCTION|E_RCONST; |
320 |
esupport &= ~(E_INCHAN|E_OUTCHAN); |
321 |
scompile("PI:3.14159265358979323846", NULL, 0); |
322 |
biggerlib(); |
323 |
for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++) |
324 |
switch (argv[i][1]) { /* get options */ |
325 |
case 'e': |
326 |
scompile(argv[++i], NULL, 0); |
327 |
break; |
328 |
case 'f': |
329 |
if (!argv[i][2]) |
330 |
fcompile(argv[++i]); |
331 |
else |
332 |
dofwd = (argv[i][0] == '+'); |
333 |
break; |
334 |
case 'b': |
335 |
dobwd = (argv[i][0] == '+'); |
336 |
break; |
337 |
case 't': |
338 |
switch (argv[i][2]) { |
339 |
case '3': |
340 |
single_plane_incident = 1; |
341 |
break; |
342 |
case '4': |
343 |
single_plane_incident = 0; |
344 |
break; |
345 |
case '\0': |
346 |
pctcull = atof(argv[++i]); |
347 |
break; |
348 |
default: |
349 |
goto userr; |
350 |
} |
351 |
break; |
352 |
case 'g': |
353 |
samp_order = atoi(argv[++i]); |
354 |
break; |
355 |
case 'l': |
356 |
lobe_lim = atoi(argv[++i]); |
357 |
break; |
358 |
case 'p': |
359 |
do_prog = atoi(argv[i]+2); |
360 |
break; |
361 |
default: |
362 |
goto userr; |
363 |
} |
364 |
if (single_plane_incident >= 0) { /* function-based BSDF? */ |
365 |
void (*evf)(char *s) = single_plane_incident ? |
366 |
&eval_isotropic : &eval_anisotropic; |
367 |
if (i != argc-1 || fundefined(argv[i]) < 3) { |
368 |
fprintf(stderr, |
369 |
"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n", |
370 |
progname); |
371 |
fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n"); |
372 |
goto userr; |
373 |
} |
374 |
++eclock; |
375 |
xml_prologue(argc, argv); /* start XML output */ |
376 |
if (dofwd) { |
377 |
input_orient = -1; |
378 |
output_orient = -1; |
379 |
prog_start("Evaluating outside reflectance"); |
380 |
(*evf)(argv[i]); |
381 |
output_orient = 1; |
382 |
prog_start("Evaluating outside->inside transmission"); |
383 |
(*evf)(argv[i]); |
384 |
} |
385 |
if (dobwd) { |
386 |
input_orient = 1; |
387 |
output_orient = 1; |
388 |
prog_start("Evaluating inside reflectance"); |
389 |
(*evf)(argv[i]); |
390 |
output_orient = -1; |
391 |
prog_start("Evaluating inside->outside transmission"); |
392 |
(*evf)(argv[i]); |
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 |
char pbuf[256]; |
401 |
FILE *fpin = fopen(argv[i], "rb"); |
402 |
if (fpin == NULL) { |
403 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
404 |
progname, argv[i]); |
405 |
return(1); |
406 |
} |
407 |
if (!load_bsdf_rep(fpin)) |
408 |
return(1); |
409 |
fclose(fpin); |
410 |
if (!nbsdf++) /* start XML on first dist. */ |
411 |
xml_prologue(argc, argv); |
412 |
sprintf(pbuf, "Interpolating component '%s'", argv[i]); |
413 |
prog_start(pbuf); |
414 |
if (single_plane_incident) |
415 |
eval_isotropic(NULL); |
416 |
else |
417 |
eval_anisotropic(NULL); |
418 |
} |
419 |
xml_epilogue(); /* finish XML output & exit */ |
420 |
return(0); |
421 |
} |
422 |
SET_FILE_BINARY(stdin); /* load from stdin */ |
423 |
if (!load_bsdf_rep(stdin)) |
424 |
return(1); |
425 |
xml_prologue(argc, argv); /* start XML output */ |
426 |
prog_start("Interpolating from standard input"); |
427 |
if (single_plane_incident) /* resample dist. */ |
428 |
eval_isotropic(NULL); |
429 |
else |
430 |
eval_anisotropic(NULL); |
431 |
xml_epilogue(); /* finish XML output & exit */ |
432 |
return(0); |
433 |
userr: |
434 |
fprintf(stderr, |
435 |
"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n", |
436 |
progname); |
437 |
fprintf(stderr, |
438 |
" or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n", |
439 |
progname); |
440 |
return(1); |
441 |
} |