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#ifndef lint |
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static const char RCSid[] = "$Id: testBSDF.c,v 1.3 2015/06/06 16:30:26 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 <stdio.h> |
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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(" q theta_i phi_i theta_o phi_o\t Query BSDF for given path\n"); |
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printf(" s N theta phi\t\t\t Generate N ray directions at given incidence\n"); |
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printf(" h theta phi\t\t\t Report hemispherical total at given incidence\n"); |
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printf(" r theta phi\t\t\t Report hemispherical reflection at given incidence\n"); |
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printf(" t theta phi\t\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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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) != NULL) { |
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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; |
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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 'Q': /* query BSDF value */ |
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if (bsdf == NULL) |
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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, vout, vin, bsdf), stderr)) |
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printf("%.3e\n", val.cieY); |
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continue; |
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case 'S': /* sample BSDF */ |
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if (bsdf == NULL) |
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goto noBSDFerr; |
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if (!*sskip2(cp,3)) |
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break; |
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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 (n-- > 0) { |
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if (SDreportError(SDsampBSDF(&val, vin, |
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rand()*(1./(RAND_MAX+.5)), |
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sflags, bsdf), stderr)) |
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break; |
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printf("%.8f %.8f %.8f\n", vin[0], vin[1], vin[2]); |
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} |
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continue; |
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case 'H': /* hemispherical totals */ |
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case 'R': |
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case 'T': |
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if (bsdf == NULL) |
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goto noBSDFerr; |
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if (!*sskip2(cp,2)) |
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break; |
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if (tolower(*cp) == 'r') |
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sflags &= ~SDsampT; |
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else if (tolower(*cp) == 't') |
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sflags &= ~SDsampR; |
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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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continue; |
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case 'A': /* resolution in proj. steradians */ |
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if (bsdf == NULL) |
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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, vin, vout, |
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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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continue; |
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} |
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Usage(argv[0]); |
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continue; |
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noBSDFerr: |
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fprintf(stderr, "%s: need to use 'l' command to load BSDF\n", argv[0]); |
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} |
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return 0; |
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} |
