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#ifndef lint
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static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.5 2012/11/09 02:16:29 greg Exp $";
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#endif
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/*
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* Load measured BSDF interpolant and write out as XML file with tensor tree.
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*
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* G. Ward
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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 "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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/* percentage to cull (<0 to turn off) */
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int pctcull = 90;
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/* sampling order */
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int samp_order = 6;
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/* Interpolate and output isotropic BSDF data */
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static void
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interp_isotropic()
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{
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const int sqres = 1<<samp_order;
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FILE *ofp = NULL;
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char cmd[128];
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int ix, ox, oy;
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FVECT ivec, ovec;
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float bsdf;
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#if DEBUG
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fprintf(stderr, "Writing isotropic order %d ", samp_order);
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if (pctcull >= 0) fprintf(stderr, "data with %d%% culling\n", pctcull);
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else fputs("raw data\n", stderr);
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#endif
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if (pctcull >= 0) { /* begin output */
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sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %d -g %d",
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pctcull, samp_order);
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fflush(stdout);
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ofp = popen(cmd, "w");
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if (ofp == NULL) {
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fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
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progname);
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exit(1);
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}
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SET_FILE_BINARY(ofp);
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} else
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fputs("{\n", stdout);
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/* run through directions */
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for (ix = 0; ix < sqres/2; ix++) {
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RBFNODE *rbf;
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SDsquare2disk(ivec, (ix+.5)/sqres, .5);
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ivec[2] = input_orient *
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sqrt(1. - ivec[0]*ivec[0] - ivec[1]*ivec[1]);
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rbf = advect_rbf(ivec);
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for (ox = 0; ox < sqres; ox++)
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for (oy = 0; oy < sqres; oy++) {
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SDsquare2disk(ovec, (ox+.5)/sqres, (oy+.5)/sqres);
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ovec[2] = output_orient *
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sqrt(1. - ovec[0]*ovec[0] - ovec[1]*ovec[1]);
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bsdf = eval_rbfrep(rbf, ovec) * output_orient/ovec[2];
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if (pctcull >= 0)
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fwrite(&bsdf, sizeof(bsdf), 1, ofp);
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else
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printf("\t%.3e\n", bsdf);
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}
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if (rbf != NULL)
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free(rbf);
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}
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if (pctcull >= 0) { /* finish output */
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if (pclose(ofp)) {
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fprintf(stderr, "%s: error running '%s'\n",
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progname, cmd);
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exit(1);
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}
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} else {
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for (ix = sqres*sqres*sqres/2; ix--; )
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fputs("\t0\n", stdout);
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fputs("}\n", stdout);
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}
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}
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/* Interpolate and output anisotropic BSDF data */
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static void
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interp_anisotropic()
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{
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const int sqres = 1<<samp_order;
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FILE *ofp = NULL;
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char cmd[128];
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int ix, iy, ox, oy;
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FVECT ivec, ovec;
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float bsdf;
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#if DEBUG
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fprintf(stderr, "Writing anisotropic order %d ", samp_order);
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if (pctcull >= 0) fprintf(stderr, "data with %d%% culling\n", pctcull);
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else fputs("raw data\n", stderr);
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#endif
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if (pctcull >= 0) { /* begin output */
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sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %d -g %d",
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pctcull, samp_order);
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fflush(stdout);
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ofp = popen(cmd, "w");
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if (ofp == NULL) {
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fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
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progname);
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exit(1);
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}
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} else
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fputs("{\n", stdout);
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/* run through directions */
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for (ix = 0; ix < sqres; ix++)
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for (iy = 0; iy < sqres; iy++) {
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RBFNODE *rbf;
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SDsquare2disk(ivec, (ix+.5)/sqres, (iy+.5)/sqres);
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ivec[2] = input_orient *
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sqrt(1. - ivec[0]*ivec[0] - ivec[1]*ivec[1]);
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rbf = advect_rbf(ivec);
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for (ox = 0; ox < sqres; ox++)
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for (oy = 0; oy < sqres; oy++) {
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SDsquare2disk(ovec, (ox+.5)/sqres, (oy+.5)/sqres);
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ovec[2] = output_orient *
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sqrt(1. - ovec[0]*ovec[0] - ovec[1]*ovec[1]);
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bsdf = eval_rbfrep(rbf, ovec) * output_orient/ovec[2];
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if (pctcull >= 0)
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fwrite(&bsdf, sizeof(bsdf), 1, ofp);
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else
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printf("\t%.3e\n", bsdf);
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}
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if (rbf != NULL)
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free(rbf);
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}
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if (pctcull >= 0) { /* finish output */
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if (pclose(ofp)) {
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fprintf(stderr, "%s: error running '%s'\n",
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progname, cmd);
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exit(1);
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}
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} else
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fputs("}\n", stdout);
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}
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/* Output XML prologue to stdout */
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static void
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xml_prologue(int ac, char *av[])
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{
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static const char *bsdf_type[4] = {
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"Reflection Back",
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"Transmission Back",
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"Transmission Front",
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"Reflection Front"
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};
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puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
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puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">");
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fputs("<!-- File produced by:", stdout);
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while (ac-- > 0) {
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fputc(' ', stdout);
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fputs(*av++, stdout);
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}
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puts(" -->");
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puts("<WindowElementType>System</WindowElementType>");
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puts("<FileType>BSDF</FileType>");
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puts("<Optical>");
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puts("<Layer>");
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puts("\t<Material>");
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puts("\t\t<Name>Name</Name>");
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puts("\t\t<Manufacturer>Manufacturer</Manufacturer>");
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puts("\t\t<DeviceType>Other</DeviceType>");
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puts("\t</Material>");
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puts("\t<DataDefinition>");
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printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
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single_plane_incident ? '3' : '4');
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puts("\t</DataDefinition>");
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puts("\t<WavelengthData>");
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puts("\t\t<LayerNumber>System</LayerNumber>");
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puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
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puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
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puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
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puts("\t\t<WavelengthDataBlock>");
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printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
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bsdf_type[(input_orient>0)<<1 | (output_orient>0)]);
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puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
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puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
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puts("\t\t\t<ScatteringData>");
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}
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/* Output XML epilogue to stdout */
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static void
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xml_epilogue(void)
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{
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puts("\t\t\t</ScatteringData>");
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puts("\t\t</WavelengthDataBlock>");
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puts("\t</WavelengthData>");
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puts("</Layer>");
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puts("</Optical>");
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puts("</WindowElement>");
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}
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/* Read in BSDF and interpolate as tensor tree representation */
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int
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main(int argc, char *argv[])
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{
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FILE *fpin = stdin;
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int i;
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progname = argv[0];
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for (i = 1; i < argc-1 && argv[i][0] == '-'; i++)
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switch (argv[i][1]) { /* get option */
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case 't':
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pctcull = atoi(argv[++i]);
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break;
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case 'g':
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samp_order = atoi(argv[++i]);
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break;
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default:
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goto userr;
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}
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if (i == argc-1) { /* open input if given */
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fpin = fopen(argv[i], "r");
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if (fpin == 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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} else if (i < argc-1)
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goto userr;
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SET_FILE_BINARY(fpin); /* load BSDF interpolant */
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if (!load_bsdf_rep(fpin))
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return(1);
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fclose(fpin);
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xml_prologue(argc, argv); /* start XML output */
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if (single_plane_incident) /* resample dist. */
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interp_isotropic();
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else
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interp_anisotropic();
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xml_epilogue(); /* finish XML output */
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return(0);
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userr:
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fprintf(stderr,
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"Usage: %s [-t pctcull][-g log2grid] [bsdf.sir] > bsdf.xml\n",
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progname);
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return(1);
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}
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