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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* Load measured BSDF data in PAB-Opto format.
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*
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* G. Ward
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*/
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "platform.h"
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#include "bsdfrep.h"
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/* global argv[0] */
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char *progname;
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/* Load a set of measurements corresponding to a particular incident angle */
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static int
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load_pabopto_meas(const char *fname)
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{
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FILE *fp = fopen(fname, "r");
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int inp_is_DSF = -1;
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double new_theta, new_phi, theta_out, phi_out, val;
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char buf[2048];
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int n, c;
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if (fp == NULL) {
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fputs(fname, stderr);
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fputs(": cannot open\n", stderr);
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return(0);
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}
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#ifdef DEBUG
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fprintf(stderr, "Loading measurement file '%s'...\n", fname);
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#endif
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/* read header information */
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while ((c = getc(fp)) == '#' || c == EOF) {
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if (fgets(buf, sizeof(buf), fp) == NULL) {
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fputs(fname, stderr);
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fputs(": unexpected EOF\n", stderr);
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fclose(fp);
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return(0);
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}
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if (!strcmp(buf, "format: theta phi DSF\n")) {
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inp_is_DSF = 1;
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continue;
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}
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if (!strcmp(buf, "format: theta phi BSDF\n")) {
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inp_is_DSF = 0;
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continue;
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}
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if (sscanf(buf, "intheta %lf", &new_theta) == 1)
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continue;
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if (sscanf(buf, "inphi %lf", &new_phi) == 1)
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continue;
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if (sscanf(buf, "incident_angle %lf %lf",
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&new_theta, &new_phi) == 2)
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continue;
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}
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ungetc(c, fp);
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if (inp_is_DSF < 0) {
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fputs(fname, stderr);
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fputs(": unknown format\n", stderr);
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fclose(fp);
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return(0);
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}
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/* prepare input grid */
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new_bsdf_data(new_theta, new_phi);
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/* read actual data */
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while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3)
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add_bsdf_data(theta_out, phi_out, val, inp_is_DSF);
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n = 0;
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while ((c = getc(fp)) != EOF)
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n += !isspace(c);
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if (n)
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fprintf(stderr,
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"%s: warning: %d unexpected characters past EOD\n",
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fname, n);
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fclose(fp);
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return(1);
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}
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/* Read in PAB-Opto BSDF files and output RBF interpolant */
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int
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main(int argc, char *argv[])
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{
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extern int nprocs;
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int i;
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/* start header */
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SET_FILE_BINARY(stdout);
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newheader("RADIANCE", stdout);
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printargs(argc, argv, stdout);
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fputnow(stdout);
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progname = argv[0]; /* get options */
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while (argc > 2 && argv[1][0] == '-') {
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switch (argv[1][1]) {
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case 'n':
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nprocs = atoi(argv[2]);
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break;
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default:
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goto userr;
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}
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argv += 2; argc -= 2;
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}
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if (argc < 3)
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goto userr;
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for (i = 1; i < argc; i++) { /* compile measurements */
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if (!load_pabopto_meas(argv[i]))
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return(1);
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make_rbfrep();
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}
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build_mesh(); /* create interpolation */
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save_bsdf_rep(stdout); /* write it out */
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return(0);
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userr:
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fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
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progname);
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return(1);
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}
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