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#ifndef lint |
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static const char RCSid[] = "$Id: bsdf2rad.c,v 2.1 2013/10/22 04:29:27 greg Exp $"; |
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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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|
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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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|
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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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|
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char *progname; |
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|
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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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int showPeaks = 0; |
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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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|
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progname = argv[0]; |
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if (argc > 1 && !strcmp(argv[1], "-p")) { |
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++showPeaks; |
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++argv; --argc; |
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} |
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if (argc < 4) { |
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fprintf(stderr, "Usage: %s [-p] bsdf.sir theta1 phi1 .. > output.rad\n", progname); |
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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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progname, 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 BSDF rep. */ |
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for (n = 0; (n < 6) & (2*n+3 < argc); n++) { |
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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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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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if (showPeaks && rbf != NULL) { |
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printf("void plastic pmat\n0\n0\n5 %f %f %f .04 .08\n", |
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1.-colarr[n][0], 1.-colarr[n][1], 1.-colarr[n][2]); |
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for (i = 0; i < rbf->nrbf; i++) { |
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ovec_from_pos(dir, rbf->rbfa[i].gx, rbf->rbfa[i].gy); |
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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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printf("pmat sphere p%d\n0\n0\n4 %f %f %f %f\n", |
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i+1, dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, |
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.007*bsdf); |
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} |
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} |
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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", progname, buf); |
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return(1); |
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} |
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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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} |
