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#ifndef lint |
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static const char RCSid[] = "$Id: testBSDF.c,v 1.16 2021/03/27 17:50:18 greg Exp $"; |
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#endif |
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/* |
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* Simple test program to demonstrate BSDF operation. |
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* |
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* G. Ward June 2015 |
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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 <math.h> |
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#include <ctype.h> |
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#include "rtio.h" |
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#include "bsdf.h" |
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|
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static void |
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Usage(const char *prog) |
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{ |
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printf("Usage: %s [bsdf_directory]\n", prog); |
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printf("Input commands:\n"); |
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printf(" L bsdf.xml\t\t\t Load (make active) given BSDF input file\n"); |
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printf(" i\t\t\t\t Report general information (metadata)\n"); |
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printf(" c\t\t\t\t Report diffuse and specular components\n"); |
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printf(" q theta_i phi_i theta_o phi_o\t Query BSDF for given path (CIE-XYZ)\n"); |
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printf(" s[r|t][s|d] N theta phi\t Generate N ray directions & colors at given incidence\n"); |
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printf(" h[s|d] theta phi\t\t Report hemispherical scattering at given incidence\n"); |
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printf(" r[s|d] theta phi\t\t Report hemispherical reflection at given incidence\n"); |
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printf(" t[s|d] theta phi\t\t Report hemispherical transmission at given incidence\n"); |
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printf(" a theta phi [t2 p2]\t\t Report resolution (in proj. steradians) for given direction(s)\n"); |
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printf(" ^D\t\t\t\t Quit program\n"); |
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} |
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|
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static void |
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vec_from_deg(FVECT v, double theta, double phi) |
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{ |
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const double DEG = M_PI/180.; |
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|
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theta *= DEG; phi *= DEG; |
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v[0] = v[1] = sin(theta); |
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v[0] *= cos(phi); |
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v[1] *= sin(phi); |
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v[2] = cos(theta); |
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} |
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|
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static void |
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printXYZ(const char *intro, const SDValue *vp) |
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{ |
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if (vp->cieY <= 1e-9) { |
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printf("%s0 0 0\n", intro); |
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return; |
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} |
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printf("%s%.3e %.3e %.3e\n", intro, |
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vp->spec.cx/vp->spec.cy*vp->cieY, |
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vp->cieY, |
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(1.-vp->spec.cx-vp->spec.cy)/ |
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vp->spec.cy*vp->cieY); |
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} |
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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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const char *directory = NULL; |
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char inp[512], path[512]; |
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const SDData *bsdf = NULL; |
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|
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if (argc > 2 || (argc == 2 && argv[1][0] == '-')) { |
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Usage(argv[0]); |
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return 1; |
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} |
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if (argc == 2) |
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directory = argv[1]; |
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|
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SDretainSet = SDretainBSDFs; /* keep BSDFs in memory */ |
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|
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/* loop on command */ |
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while (fgets(inp, sizeof(inp), stdin)) { |
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int sflags = SDsampAll; |
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char *cp = inp; |
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char *cp2; |
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FVECT vin, vout; |
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double proja[2]; |
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int n, i; |
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SDValue val; |
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|
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while (isspace(*cp)) cp++; |
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|
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switch (toupper(*cp)) { |
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case 'L': /* load/activate BSDF input */ |
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cp2 = cp = sskip2(cp, 1); |
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if (!*cp) |
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break; |
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while (*cp) cp++; |
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while (isspace(*--cp)) *cp = '\0'; |
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if (directory) |
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sprintf(path, "%s/%s", directory, cp2); |
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else |
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strcpy(path, cp2); |
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if (bsdf) |
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SDfreeCache(bsdf); |
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bsdf = SDcacheFile(path); |
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continue; |
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case 'I': /* report general info. */ |
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if (!bsdf) |
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goto noBSDFerr; |
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printf("Material: '%s'\n", bsdf->matn); |
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printf("Manufacturer: '%s'\n", bsdf->makr); |
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printf("Width, Height, Thickness (m): %.4e, %.4e, %.4e\n", |
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bsdf->dim[0], bsdf->dim[1], bsdf->dim[2]); |
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if (bsdf->mgf) |
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printf("Has geometry: %lu bytes\n", |
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(unsigned long)strlen(bsdf->mgf)); |
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else |
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printf("Has geometry: no\n"); |
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break; |
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case 'C': /* report constant values */ |
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if (!bsdf) |
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goto noBSDFerr; |
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if (bsdf->rf) |
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printf("Peak front hemispherical reflectance: %.3e\n", |
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bsdf->rLambFront.cieY + |
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bsdf->rf->maxHemi); |
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if (bsdf->rb) |
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printf("Peak back hemispherical reflectance: %.3e\n", |
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bsdf->rLambBack.cieY + |
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bsdf->rb->maxHemi); |
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if (bsdf->tf) |
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printf("Peak front hemispherical transmittance: %.3e\n", |
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bsdf->tLambFront.cieY + bsdf->tf->maxHemi); |
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if (bsdf->tb) |
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printf("Peak back hemispherical transmittance: %.3e\n", |
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bsdf->tLambBack.cieY + bsdf->tb->maxHemi); |
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printXYZ("Diffuse Front Reflectance: ", &bsdf->rLambFront); |
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printXYZ("Diffuse Back Reflectance: ", &bsdf->rLambBack); |
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printXYZ("Diffuse Front Transmittance: ", &bsdf->tLambFront); |
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printXYZ("Diffuse Back Transmittance: ", &bsdf->tLambBack); |
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break; |
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case 'Q': /* query BSDF value */ |
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if (!bsdf) |
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goto noBSDFerr; |
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if (!*sskip2(cp,4)) |
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break; |
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vec_from_deg(vin, atof(sskip2(cp,1)), atof(sskip2(cp,2))); |
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vec_from_deg(vout, atof(sskip2(cp,3)), atof(sskip2(cp,4))); |
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if (!SDreportError(SDevalBSDF(&val, vin, vout, bsdf), stderr)) |
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printXYZ("", &val); |
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break; |
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case 'S': /* sample BSDF */ |
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if (!bsdf) |
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goto noBSDFerr; |
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if (!*sskip2(cp,3)) |
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break; |
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if (toupper(cp[1]) == 'R') { |
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sflags &= ~SDsampT; |
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++cp; |
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} else if (toupper(cp[1]) == 'T') { |
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sflags &= ~SDsampR; |
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++cp; |
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} |
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if (toupper(cp[1]) == 'S') |
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sflags &= ~SDsampDf; |
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else if (toupper(cp[1]) == 'D') |
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sflags &= ~SDsampSp; |
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i = n = atoi(sskip2(cp,1)); |
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vec_from_deg(vin, atof(sskip2(cp,2)), atof(sskip2(cp,3))); |
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while (i-- > 0) { |
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VCOPY(vout, vin); |
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if (SDreportError(SDsampBSDF(&val, vout, |
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(i+rand()*(1./(RAND_MAX+.5)))/(double)n, |
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sflags, bsdf), stderr)) |
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break; |
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printf("%.8f %.8f %.8f ", vout[0], vout[1], vout[2]); |
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printXYZ("", &val); |
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} |
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break; |
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case 'H': /* hemispherical values */ |
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case 'R': |
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case 'T': |
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if (!bsdf) |
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goto noBSDFerr; |
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if (!*sskip2(cp,2)) |
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break; |
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if (toupper(cp[0]) == 'R') |
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sflags &= ~SDsampT; |
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else if (toupper(cp[0]) == 'T') |
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sflags &= ~SDsampR; |
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if (toupper(cp[1]) == 'S') |
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sflags &= ~SDsampDf; |
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else if (toupper(cp[1]) == 'D') |
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sflags &= ~SDsampSp; |
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vec_from_deg(vin, atof(sskip2(cp,1)), atof(sskip2(cp,2))); |
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printf("%.4e\n", SDdirectHemi(vin, sflags, bsdf)); |
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break; |
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case 'A': /* resolution in proj. steradians */ |
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if (!bsdf) |
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goto noBSDFerr; |
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if (!*sskip2(cp,2)) |
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break; |
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vec_from_deg(vin, atof(sskip2(cp,1)), atof(sskip2(cp,2))); |
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if (*sskip2(cp,4)) { |
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vec_from_deg(vout, atof(sskip2(cp,3)), atof(sskip2(cp,4))); |
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if (SDreportError(SDsizeBSDF(proja, vout, vin, |
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SDqueryMin+SDqueryMax, bsdf), stderr)) |
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continue; |
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} else if (SDreportError(SDsizeBSDF(proja, vin, NULL, |
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SDqueryMin+SDqueryMax, bsdf), stderr)) |
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continue; |
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printf("%.4e %.4e\n", proja[0], proja[1]); |
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break; |
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default: |
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Usage(argv[0]); |
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break; |
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} |
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fflush(stdout); /* in case we're on remote */ |
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continue; |
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noBSDFerr: |
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fprintf(stderr, "%s: First, use 'L' command to load BSDF\n", argv[0]); |
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} |
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return 0; |
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} |
