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#ifndef lint |
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static const char RCSid[] = "$Id: bsdf2rado.c,v 2.4 2021/09/09 15:17:45 greg 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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|
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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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|
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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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#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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|
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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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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.tLambFront.cieY < bsdf_min*M_PI) |
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bsdf_min = myBSDF.tLambFront.cieY/M_PI; |
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if (myBSDF.tb != NULL && myBSDF.tLambBack.cieY < bsdf_min*M_PI) |
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bsdf_min = myBSDF.tLambBack.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 %.4g\n", bsdf_min); |
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#endif |
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min_log = log(bsdf_min*.5 + 1e-6); |
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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 (%.2f,%.2f)\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: %.4f\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: %.4f\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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grid_res-1, grid_res-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 < grid_res; i++) |
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for (j = 0; j < grid_res; 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, idir, |
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odir, &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-6) - 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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} |
