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#ifndef lint
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static const char RCSid[] = "$Id: bsdf2rad.c,v 2.15 2016/03/06 01:13:17 schorsch Exp $";
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#endif
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/*
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* Plot 3-D BSDF output based on scattering interpolant or XML 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 <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include "rtprocess.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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#if defined(_WIN32) || defined(_WIN64)
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char validf[] = "-e \"valid(s,t)=X`SYS(s,t)^2+Y`SYS(s,t)^2+Z`SYS(s,t)^2-1e-7\"";
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#else
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char validf[] = "-e 'valid(s,t)=X`SYS(s,t)^2+Y`SYS(s,t)^2+Z`SYS(s,t)^2-1e-7'";
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#endif
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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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int showPeaks = 0;
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int doTrans = 0;
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int inpXML = -1;
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RBFNODE *rbf = NULL;
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FILE *fp;
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char buf[128];
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SDData myBSDF;
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double bsdf, min_log;
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FVECT idir, odir;
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int i, j, n;
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/* check arguments */
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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 > 1 && !strcmp(argv[1], "-t")) {
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++doTrans;
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++argv; --argc;
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}
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if (argc >= 4 && (n = strlen(argv[1])-4) > 0) {
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if (!strcasecmp(argv[1]+n, ".xml"))
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inpXML = 1;
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else if (!strcasecmp(argv[1]+n, ".sir"))
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inpXML = 0;
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}
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if (inpXML < 0) {
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fprintf(stderr, "Usage: %s [-p] bsdf.sir theta1 phi1 .. > output.rad\n", progname);
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fprintf(stderr, " Or: %s [-t] bsdf.xml 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 (inpXML) {
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SDclearBSDF(&myBSDF, argv[1]);
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if (SDreportError(SDloadFile(&myBSDF, argv[1]), stderr))
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return(1);
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bsdf_min = 1./M_PI;
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if (myBSDF.rf != NULL && myBSDF.rLambFront.cieY < bsdf_min*M_PI)
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bsdf_min = myBSDF.rLambFront.cieY/M_PI;
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if (myBSDF.rb != NULL && myBSDF.rLambBack.cieY < bsdf_min*M_PI)
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bsdf_min = myBSDF.rLambBack.cieY/M_PI;
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if ((myBSDF.tf != NULL) | (myBSDF.tb != NULL) &&
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myBSDF.tLamb.cieY < bsdf_min*M_PI)
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bsdf_min = myBSDF.tLamb.cieY/M_PI;
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if (doTrans && (myBSDF.tf == NULL) & (myBSDF.tb == NULL)) {
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fprintf(stderr, "%s: no transmitted component in '%s'\n",
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progname, argv[1]);
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return(1);
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}
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} else {
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fp = fopen(argv[1], "rb");
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if (fp == 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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}
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#ifdef DEBUG
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fprintf(stderr, "Minimum BSDF set to %.4f\n", bsdf_min);
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#endif
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min_log = log(bsdf_min*.5 + 1e-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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double theta = (M_PI/180.)*atof(argv[2*n+2]);
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double phi = (M_PI/180.)*atof(argv[2*n+3]);
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if (theta < -FTINY) {
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fprintf(stderr, "%s: theta values must be positive\n",
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progname);
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return(1);
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}
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if (inpXML) {
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input_orient = (theta <= M_PI/2.) ? 1 : -1;
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output_orient = doTrans ? -input_orient : input_orient;
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}
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idir[2] = sin(theta);
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idir[0] = idir[2] * cos(phi);
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idir[1] = idir[2] * sin(phi);
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idir[2] = input_orient * sqrt(1. - idir[2]*idir[2]);
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#ifdef DEBUG
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fprintf(stderr, "Computing BSDF for incident direction (%.1f,%.1f)\n",
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get_theta180(idir), get_phi360(idir));
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#endif
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if (!inpXML)
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rbf = advect_rbf(idir, 15000);
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#ifdef DEBUG
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if (inpXML)
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fprintf(stderr, "Hemispherical %s: %.3f\n",
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(output_orient > 0 ^ input_orient > 0 ?
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"transmission" : "reflection"),
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SDdirectHemi(idir, SDsampSp|SDsampDf |
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(output_orient > 0 ^ input_orient > 0 ?
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SDsampT : SDsampR), &myBSDF));
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else if (rbf == NULL)
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fputs("Empty RBF\n", stderr);
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else
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fprintf(stderr, "Hemispherical %s: %.3f\n",
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(output_orient > 0 ^ input_orient > 0 ?
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"transmission" : "reflection"),
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rbf->vtotal);
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#endif
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printf("# Incident direction (theta,phi) = (%.2f,%.2f) deg.\n\n",
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(180./M_PI)*theta, (180./M_PI)*phi);
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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(odir, rbf->rbfa[i].gx, rbf->rbfa[i].gy);
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bsdf = eval_rbfrep(rbf, odir);
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bsdf = log(bsdf + 1e-5) - 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, odir[0]*bsdf, odir[1]*bsdf, odir[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 %d %s", n+1,
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GRIDRES-1, GRIDRES-1, validf);
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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(odir, i, j);
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if (inpXML) {
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SDValue sval;
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if (SDreportError(SDevalBSDF(&sval, odir,
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idir, &myBSDF), stderr))
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return(1);
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bsdf = sval.cieY;
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} else
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bsdf = eval_rbfrep(rbf, odir);
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bsdf = log(bsdf + 1e-5) - min_log;
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fprintf(fp, "%.8e %.8e %.8e\n",
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odir[0]*bsdf, odir[1]*bsdf, odir[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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