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#ifndef lint |
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static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.9 2012/11/22 06:07:17 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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|
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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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double pctcull = 90.; |
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/* sampling order */ |
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int samp_order = 6; |
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|
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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 %.1f%% 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 %f -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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|
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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 %.1f%% 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 %f -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; /* Klems reversal */ |
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SDsquare2disk(ivec, (ix+.5)/sqres, (iy+.5)/sqres); |
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ivec[0] = -ivec[0]; ivec[1] = -ivec[1]; |
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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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|
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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 Front", |
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"Transmission Front", |
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"Transmission Back", |
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"Reflection Back" |
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}; |
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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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|
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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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|
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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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|
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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 = atof(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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|
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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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} |
