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greg |
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#ifndef lint
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static const char RCSid[] = "$Id$";
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#endif
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/*
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* checkBSDF.c
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*
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* Load BSDF XML file and check Helmholtz reciprocity
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*/
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#define _USE_MATH_DEFINES
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#include <math.h>
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#include "rtio.h"
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#include "bsdf.h"
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#include "bsdf_m.h"
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#include "bsdf_t.h"
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#define F_IN_COLOR 0x1
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#define F_ISOTROPIC 0x2
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#define F_MATRIX 0x4
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#define F_TTREE 0x8
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/* Figure out BSDF type (and optionally determine if in color) */
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const char *
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getBSDFtype(const SDData *bsdf, int *flags)
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{
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const SDSpectralDF *df = bsdf->tb;
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if (flags) *flags = 0;
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if (!df) df = bsdf->tf;
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if (!df) df = bsdf->rf;
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if (!df) df = bsdf->rb;
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if (!df) return "Pure_Lambertian";
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if (df->comp[0].func == &SDhandleMtx) {
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const SDMat *m = (const SDMat *)df->comp[0].dist;
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if (flags) {
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*flags |= F_MATRIX;
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*flags |= F_IN_COLOR*(m->chroma != NULL);
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}
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switch (m->ninc) {
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case 145:
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return "Klems_Full";
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case 73:
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return "Klems_Half";
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case 41:
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return "Klems_Quarter";
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}
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return "Unknown_Matrix";
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}
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if (df->comp[0].func == &SDhandleTre) {
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const SDTre *t = (const SDTre *)df->comp[0].dist;
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if (flags) {
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*flags |= F_TTREE;
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*flags |= F_IN_COLOR*(t->stc[1] != NULL);
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}
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switch (t->stc[0]->ndim) {
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case 4:
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return "Anisotropic_Tensor_Tree";
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case 3:
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if (flags) *flags |= F_ISOTROPIC;
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return "Isotropic_Tensor_Tree";
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}
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return "Unknown_Tensor_Tree";
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}
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return "Unknown";
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}
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/* Report details related to one hemisphere distribution */
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void
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detailComponent(const char *nm, const SDValue *lamb, const SDSpectralDF *df)
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{
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printf("%s\t%4.1f %4.1f %4.1f\t\t", nm, 100.*lamb->cieY*lamb->spec.cx/lamb->spec.cy,
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100.*lamb->cieY,
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100.*lamb->cieY*(1.f - lamb->spec.cx - lamb->spec.cy)/lamb->spec.cy);
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if (df)
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printf("%5.1f%%\t\t%.2f deg\n", 100.*df->maxHemi,
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sqrt(df->minProjSA/M_PI)*(360./M_PI));
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else
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puts("0%\t\t180");
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}
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/* Report reciprocity errors for the given directions */
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void
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checkReciprocity(const char *nm, const int side1, const int side2,
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const SDData *bsdf, const int fl)
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{
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const SDSpectralDF *df = bsdf->tf;
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double emin=FHUGE, emax=0, esum=0;
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int ntested=0;
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int ec;
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if (side1 == side2) {
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df = (side1 > 0) ? bsdf->rf : bsdf->rb;
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if (!df) goto nothing2do;
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} else if (!bsdf->tf | !bsdf->tb)
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goto nothing2do;
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if (fl & F_MATRIX) { /* special case for matrix BSDF */
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const SDMat *m = (const SDMat *)df->comp[0].dist;
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int i = m->ninc;
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FVECT vin, vout;
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double rerr;
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SDValue vrev;
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while (i--) {
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int o = m->nout;
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if (!mBSDF_incvec(vin, m, i+.5))
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continue;
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while (o--) {
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if (!mBSDF_outvec(vout, m, o+.5))
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continue;
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rerr = mBSDF_value(m, o, i);
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if (rerr <= FTINY)
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continue;
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if (SDreportError( SDevalBSDF(&vrev, vout, vin, bsdf), stderr))
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return;
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rerr = 100.*fabs(rerr - vrev.cieY)/rerr;
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if (rerr < emin) emin = rerr;
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if (rerr > emax) emax = rerr;
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esum += rerr;
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++ntested;
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}
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}
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} else {
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}
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if (ntested) {
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printf("%s\t%.1f\t%.1f\t%.1f\n", nm, emin, esum/(double)ntested, emax);
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return;
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}
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nothing2do:
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printf("%s\t0\t0\t0\n", nm);
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}
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/* Report on the given BSDF XML file */
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int
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checkXML(char *fname)
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{
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int flags;
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SDError ec;
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SDData myBSDF;
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char *pth;
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printf("File: '%s'\n", fname);
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SDclearBSDF(&myBSDF, fname);
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pth = getpath(fname, getrlibpath(), R_OK);
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if (!pth) {
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fprintf(stderr, "Cannot find file '%s'\n", fname);
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return 0;
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}
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ec = SDloadFile(&myBSDF, pth);
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if (ec) goto err;
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printf("Manufacturer: '%s'\n", myBSDF.makr);
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printf("BSDF Name: '%s'\n", myBSDF.matn);
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printf("Dimensions (W x H x Thickness): %g x %g x %g cm\n", 100.*myBSDF.dim[0],
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100.*myBSDF.dim[1], 100.*myBSDF.dim[2]);
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printf("Type: %s\n", getBSDFtype(&myBSDF, &flags));
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printf("Color: %d\n", (flags & F_IN_COLOR) != 0);
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printf("Has Geometry: %d\n", (myBSDF.mgf != NULL));
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puts("Component\tLambertian XYZ %\tMax. Dir\tMin. Angle");
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detailComponent("Internal Refl", &myBSDF.rLambFront, myBSDF.rf);
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detailComponent("External Refl", &myBSDF.rLambBack, myBSDF.rb);
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detailComponent("Int->Ext Trans", &myBSDF.tLambFront, myBSDF.tf);
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detailComponent("Ext->Int Trans", &myBSDF.tLambBack, myBSDF.tb);
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puts("Component\tReciprocity Error (min/avg/max %)");
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checkReciprocity("Front Refl", 1, 1, &myBSDF, flags);
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checkReciprocity("Back Refl", -1, -1, &myBSDF, flags);
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checkReciprocity("Transmission", -1, 1, &myBSDF, flags);
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SDfreeBSDF(&myBSDF);
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return 1;
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err:
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SDreportError(ec, stderr);
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SDfreeBSDF(&myBSDF);
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return 0;
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}
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int
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main(int argc, char *argv[])
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{
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int i;
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if (argc < 2) {
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fprintf(stderr, "Usage: %s bsdf.xml ..\n", argv[0]);
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return 1;
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}
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for (i = 1; i < argc; i++) {
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puts("=====================================================");
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if (!checkXML(argv[i]))
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return 1;
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}
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return 0;
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}
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