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* G. Ward |
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*/ |
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|
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#define _USE_MATH_DEFINES |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <math.h> |
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#include "platform.h" |
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#include "bsdfrep.h" |
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#include "resolu.h" |
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/* global argv[0] */ |
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char *progname; |
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|
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typedef struct { |
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const char *fname; /* input file path */ |
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double theta, phi; /* incident angles (in degrees) */ |
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double theta, phi; /* input angles */ |
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int igp[2]; /* input grid position */ |
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int isDSF; /* data is DSF (rather than BSDF)? */ |
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long dstart; /* data start offset in file */ |
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} PGINPUT; |
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|
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/* Compare incident angles */ |
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static int |
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cmp_inang(const void *p1, const void *p2) |
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cmp_indir(const void *p1, const void *p2) |
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{ |
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const PGINPUT *inp1 = (const PGINPUT *)p1; |
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const PGINPUT *inp2 = (const PGINPUT *)p2; |
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int ydif = inp1->igp[1] - inp2->igp[1]; |
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|
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if (inp1->theta > inp2->theta+FTINY) |
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return(1); |
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if (inp1->theta < inp2->theta-FTINY) |
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return(-1); |
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if (inp1->phi > inp2->phi+FTINY) |
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return(1); |
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if (inp1->phi < inp2->phi-FTINY) |
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return(-1); |
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return(0); |
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if (ydif) |
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return(ydif); |
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|
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return(inp1->igp[0] - inp2->igp[0]); |
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} |
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|
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/* Prepare a PAB-Opto input file by reading its header */ |
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init_pabopto_inp(const int i, const char *fname) |
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{ |
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FILE *fp = fopen(fname, "r"); |
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FVECT dv; |
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char buf[2048]; |
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int c; |
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|
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fclose(fp); |
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return(0); |
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} |
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if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1) |
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continue; |
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if (sscanf(buf, "format: theta phi %s", typ) == 1) { |
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if (!strcasecmp(typ, "DSF")) { |
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inpfile[i].isDSF = 1; |
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fputs(": unknown incident angle\n", stderr); |
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return(0); |
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} |
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while (inpfile[i].phi < 0) /* normalize phi direction */ |
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inpfile[i].phi += 360.; |
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/* convert angle to grid position */ |
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> |
dv[2] = sin(M_PI/180.*inpfile[i].theta); |
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dv[0] = cos(M_PI/180.*inpfile[i].phi)*dv[2]; |
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dv[1] = sin(M_PI/180.*inpfile[i].phi)*dv[2]; |
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dv[2] = sqrt(1. - dv[2]*dv[2]); |
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pos_from_vec(inpfile[i].igp, dv); |
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return(1); |
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} |
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|
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static int |
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add_pabopto_inp(const int i) |
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{ |
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< |
FILE *fp = fopen(inpfile[i].fname, "r"); |
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< |
double theta_out, phi_out, val; |
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< |
int n, c; |
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> |
FILE *fp = fopen(inpfile[i].fname, "r"); |
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> |
double theta_out, phi_out, val; |
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> |
int n, c; |
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|
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if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) { |
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fputs(inpfile[i].fname, stderr); |
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return(0); |
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} |
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/* prepare input grid */ |
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< |
if (!i || cmp_inang(&inpfile[i-1], &inpfile[i])) { |
| 129 |
< |
if (i) /* need to process previous incidence */ |
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> |
if (!i || cmp_indir(&inpfile[i-1], &inpfile[i])) { |
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> |
if (i) /* process previous incidence */ |
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make_rbfrep(); |
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#ifdef DEBUG |
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fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n", |
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return(1); |
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} |
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|
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< |
#if 1 |
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> |
#ifndef TEST_MAIN |
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/* Read in PAB-Opto BSDF files and output RBF interpolant */ |
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int |
| 157 |
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main(int argc, char *argv[]) |
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for (i = 0; i < ninpfiles; i++) |
| 185 |
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if (!init_pabopto_inp(i, argv[i+1])) |
| 186 |
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return(1); |
| 187 |
< |
qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_inang); |
| 187 |
> |
qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_indir); |
| 188 |
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/* compile measurements */ |
| 189 |
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for (i = 0; i < ninpfiles; i++) |
| 190 |
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if (!add_pabopto_inp(i)) |
| 220 |
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return(1); |
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/* reduce data set */ |
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make_rbfrep(); |
| 223 |
< |
/* produce spheres at meas. */ |
| 223 |
> |
#ifdef DEBUG |
| 224 |
> |
fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min); |
| 225 |
> |
#endif |
| 226 |
> |
min_log = log(bsdf_min*.5 + 1e-5); |
| 227 |
> |
#if 1 /* produce spheres at meas. */ |
| 228 |
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puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n"); |
| 219 |
– |
min_log = log(bsdf_min*.5); |
| 229 |
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n = 0; |
| 230 |
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for (i = 0; i < GRIDRES; i++) |
| 231 |
|
for (j = 0; j < GRIDRES; j++) |
| 232 |
< |
if (dsf_grid[i][j].nval > 0) { |
| 232 |
> |
if (dsf_grid[i][j].sum.n > 0) { |
| 233 |
|
ovec_from_pos(dir, i, j); |
| 234 |
< |
bsdf = dsf_grid[i][j].vsum/(dsf_grid[i][j].nval*dir[2]); |
| 234 |
> |
bsdf = dsf_grid[i][j].sum.v / |
| 235 |
> |
(dsf_grid[i][j].sum.n*output_orient*dir[2]); |
| 236 |
|
if (bsdf <= bsdf_min*.6) |
| 237 |
|
continue; |
| 238 |
< |
bsdf = log(bsdf) - min_log; |
| 238 |
> |
bsdf = log(bsdf + 1e-5) - min_log; |
| 239 |
|
ovec_from_pos(dir, i, j); |
| 240 |
|
printf("yellow sphere s%04d\n0\n0\n", ++n); |
| 241 |
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printf("4 %.6g %.6g %.6g %.6g\n\n", |
| 242 |
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
| 243 |
|
.007*bsdf); |
| 244 |
|
} |
| 245 |
< |
/* output continuous surface */ |
| 245 |
> |
#endif |
| 246 |
> |
#if 1 /* spheres at RBF peaks */ |
| 247 |
> |
puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n"); |
| 248 |
> |
for (n = 0; n < dsf_list->nrbf; n++) { |
| 249 |
> |
RBFVAL *rbf = &dsf_list->rbfa[n]; |
| 250 |
> |
ovec_from_pos(dir, rbf->gx, rbf->gy); |
| 251 |
> |
bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); |
| 252 |
> |
bsdf = log(bsdf + 1e-5) - min_log; |
| 253 |
> |
printf("red sphere p%04d\n0\n0\n", ++n); |
| 254 |
> |
printf("4 %.6g %.6g %.6g %.6g\n\n", |
| 255 |
> |
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
| 256 |
> |
.011*bsdf); |
| 257 |
> |
} |
| 258 |
> |
#endif |
| 259 |
> |
#if 1 /* output continuous surface */ |
| 260 |
|
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n"); |
| 261 |
|
fflush(stdout); |
| 262 |
|
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1); |
| 263 |
|
pfp = popen(buf, "w"); |
| 264 |
|
if (pfp == NULL) { |
| 265 |
< |
fputs(buf, stderr); |
| 242 |
< |
fputs(": cannot start command\n", stderr); |
| 265 |
> |
fprintf(stderr, "%s: cannot open '| %s'\n", argv[0], buf); |
| 266 |
|
return(1); |
| 267 |
|
} |
| 268 |
|
for (i = 0; i < GRIDRES; i++) |
| 269 |
|
for (j = 0; j < GRIDRES; j++) { |
| 270 |
|
ovec_from_pos(dir, i, j); |
| 271 |
< |
bsdf = eval_rbfrep(dsf_list, dir) / dir[2]; |
| 272 |
< |
bsdf = log(bsdf) - min_log; |
| 271 |
> |
bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); |
| 272 |
> |
bsdf = log(bsdf + 1e-5) - min_log; |
| 273 |
|
fprintf(pfp, "%.8e %.8e %.8e\n", |
| 274 |
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
| 275 |
|
} |
| 276 |
< |
return(pclose(pfp)==0 ? 0 : 1); |
| 276 |
> |
if (pclose(pfp) != 0) |
| 277 |
> |
return(1); |
| 278 |
> |
#endif |
| 279 |
> |
return(0); |
| 280 |
|
} |
| 281 |
|
#endif |
