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#ifndef lint |
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static const char RCSid[] = "$Id: bsdfquery.c,v 2.13 2025/06/03 21:31:51 greg Exp $"; |
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#endif |
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/* |
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* Query values from the given BSDF (scattering interpolant or XML repres.) |
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* Input query is incident and exiting vectors directed away from surface. |
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* We normalize. Output is a BSDF value for the vector pair. |
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* A zero length in or out vector is ignored, causing output to be flushed. |
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* It is wise to sort the input directions to keep identical ones together |
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* when using a scattering interpolant representation. |
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*/ |
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|
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#define _USE_MATH_DEFINES |
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#include <stdlib.h> |
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#include "rtmath.h" |
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#include "rtio.h" |
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#include "bsdfrep.h" |
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|
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/* Read in a vector pair */ |
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static int |
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readIOdir(FVECT idir, FVECT odir, FILE *fp, int fmt) |
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{ |
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double dvec[6]; |
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float fvec[6]; |
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tryagain: |
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switch (fmt) { |
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case 'a': |
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if (fscanf(fp, FVFORMAT, &idir[0], &idir[1], &idir[2]) != 3 || |
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fscanf(fp, FVFORMAT, &odir[0], &odir[1], &odir[2]) != 3) |
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return(0); |
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break; |
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case 'd': |
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if (getbinary(dvec, sizeof(double), 6, fp) != 6) |
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return(0); |
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VCOPY(idir, dvec); |
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VCOPY(odir, dvec+3); |
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break; |
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case 'f': |
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if (getbinary(fvec, sizeof(float), 6, fp) != 6) |
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return(0); |
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VCOPY(idir, fvec); |
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VCOPY(odir, fvec+3); |
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break; |
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} |
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if ((normalize(idir) == 0) | (normalize(odir) == 0)) { |
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fflush(stdout); /* desired side-effect? */ |
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goto tryagain; |
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} |
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return(1); |
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} |
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|
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/* Get BSDF values for the input and output directions given on stdin */ |
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int |
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main(int argc, char *argv[]) |
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{ |
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int unbuffered = 0; |
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int repXYZ = 0; |
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int inpXML = -1; |
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int inpfmt = 'a'; |
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int outfmt = 'a'; |
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RBFNODE *rbf = NULL; |
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int32 prevInpDir = 0; |
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SDData myBSDF; |
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FVECT idir, odir; |
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int n; |
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/* set global progname */ |
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fixargv0(argv[0]); |
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/* check arguments */ |
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while (argc > 2 && argv[1][0] == '-') { |
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switch (argv[1][1]) { |
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case 'u': /* unbuffered output */ |
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unbuffered = 1; |
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break; |
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case 'c': /* color output */ |
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repXYZ = 1; |
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break; |
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case 'f': /* i/o format */ |
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if (!argv[1][2] || strchr("afd", argv[1][2]) == NULL) |
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goto userr; |
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inpfmt = outfmt = argv[1][2]; |
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if (argv[1][3] && strchr("afd", argv[1][3]) != NULL) |
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outfmt = argv[1][3]; |
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break; |
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default: |
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goto userr; |
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} |
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++argv; --argc; |
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} |
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if (argc > 1 && (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 ((argc != 2) | (inpXML < 0)) |
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goto userr; |
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/* load BSDF representation */ |
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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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} else { |
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FILE *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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/* query BSDF values */ |
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while (readIOdir(idir, odir, stdin, inpfmt)) { |
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SDValue sval; |
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if (inpXML) { |
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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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} else { |
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int32 inpDir = encodedir(idir); |
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if (inpDir != prevInpDir) { |
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if (idir[2] > 0 ^ input_orient > 0) { |
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fprintf(stderr, "%s: input hemisphere error\n", |
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progname); |
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return(1); |
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} |
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if (rbf != NULL) free(rbf); |
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rbf = advect_rbf(idir, 15000); |
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prevInpDir = inpDir; |
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} |
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if (odir[2] > 0 ^ output_orient > 0) { |
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fprintf(stderr, "%s: output hemisphere error\n", |
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progname); |
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return(1); |
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} |
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if (SDreportError(eval_rbfcol(&sval, rbf, odir), stderr)) |
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return(1); |
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} |
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|
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switch (outfmt) { /* write to stdout */ |
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case 'a': |
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if (repXYZ) { |
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double cieX = sval.spec.cx/sval.spec.cy*sval.cieY; |
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double cieZ = (1. - sval.spec.cx - sval.spec.cy) / |
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sval.spec.cy * sval.cieY; |
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printf("%.6e %.6e %.6e\n", cieX, sval.cieY, cieZ); |
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} else |
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printf("%.6e\n", sval.cieY); |
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break; |
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case 'd': |
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if (repXYZ) { |
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double cieXYZ[3]; |
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cieXYZ[0] = sval.spec.cx/sval.spec.cy*sval.cieY; |
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cieXYZ[1] = sval.cieY; |
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cieXYZ[2] = (1. - sval.spec.cx - sval.spec.cy) / |
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sval.spec.cy * sval.cieY; |
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putbinary(cieXYZ, sizeof(double), 3, stdout); |
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} else |
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putbinary(&sval.cieY, sizeof(double), 1, stdout); |
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break; |
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case 'f': |
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if (repXYZ) { |
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float cieXYZ[3]; |
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cieXYZ[0] = sval.spec.cx/sval.spec.cy*sval.cieY; |
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cieXYZ[1] = sval.cieY; |
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cieXYZ[2] = (1. - sval.spec.cx - sval.spec.cy) / |
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sval.spec.cy * sval.cieY; |
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putbinary(cieXYZ, sizeof(float), 3, stdout); |
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} else { |
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float cieY = sval.cieY; |
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putbinary(&cieY, sizeof(float), 1, stdout); |
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} |
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break; |
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} |
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if (unbuffered) |
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fflush(stdout); |
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} |
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/* if (rbf != NULL) free(rbf); */ |
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return(0); |
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userr: |
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fprintf(stderr, "Usage: %s [-u][-c][-fio] bsdf.{sir|xml}\n", progname); |
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return(1); |
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} |
