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greg |
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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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* Plot 3-D BSDF output based on scattering interpolant representation
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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 <math.h>
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#include "bsdfrep.h"
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const float colarr[6][3] = {
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.7, 1., .7,
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1., .7, .7,
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.7, .7, 1.,
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1., .5, 1.,
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1., 1., .5,
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.5, 1., 1.
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};
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char *progname;
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/* Produce a Radiance model plotting the indicated incident direction(s) */
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int
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main(int argc, char *argv[])
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{
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char buf[128];
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FILE *fp;
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RBFNODE *rbf;
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double bsdf, min_log;
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FVECT dir;
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int i, j, n;
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progname = argv[0];
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if (argc < 4) {
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fprintf(stderr, "Usage: %s bsdf.sir theta1 phi1 .. > output.rad\n", argv[0]);
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return(1);
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}
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/* load input */
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if ((fp = fopen(argv[1], "rb")) == NULL) {
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fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
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argv[0], argv[1]);
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return(1);
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}
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if (!load_bsdf_rep(fp))
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return(1);
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fclose(fp);
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min_log = log(bsdf_min*.5);
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/* output surface(s) */
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for (n = 0; (n < 6) & (2*n+3 < argc); n++) {
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printf("void trans tmat\n0\n0\n7 %f %f %f .04 .04 .9 1\n",
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colarr[n][0], colarr[n][1], colarr[n][2]);
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fflush(stdout);
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sprintf(buf, "gensurf tmat bsdf - - - %d %d", GRIDRES-1, GRIDRES-1);
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fp = popen(buf, "w");
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if (fp == NULL) {
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fprintf(stderr, "%s: cannot open '| %s'\n", argv[0], buf);
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return(1);
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}
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dir[2] = sin((M_PI/180.)*atof(argv[2*n+2]));
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dir[0] = dir[2] * cos((M_PI/180.)*atof(argv[2*n+3]));
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dir[1] = dir[2] * sin((M_PI/180.)*atof(argv[2*n+3]));
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dir[2] = input_orient * sqrt(1. - dir[2]*dir[2]);
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fprintf(stderr, "Computing DSF for incident direction (%.1f,%.1f)\n",
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get_theta180(dir), get_phi360(dir));
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rbf = advect_rbf(dir, 15000);
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if (rbf == NULL)
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fputs("NULL RBF\n", stderr);
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else
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fprintf(stderr, "Hemispherical reflectance: %.3f\n", rbf->vtotal);
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for (i = 0; i < GRIDRES; i++)
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for (j = 0; j < GRIDRES; j++) {
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ovec_from_pos(dir, i, j);
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bsdf = eval_rbfrep(rbf, dir) / (output_orient*dir[2]);
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bsdf = log(bsdf) - min_log;
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fprintf(fp, "%.8e %.8e %.8e\n",
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dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf);
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}
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if (rbf != NULL)
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free(rbf);
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if (pclose(fp))
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return(1);
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}
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return(0);
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}
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