--- ray/src/cv/pabopto2bsdf.c 2013/09/12 16:09:31 2.5 +++ ray/src/cv/pabopto2bsdf.c 2014/03/21 01:04:42 2.21 @@ -1,5 +1,5 @@ #ifndef lint -static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.5 2013/09/12 16:09:31 greg Exp $"; +static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.21 2014/03/21 01:04:42 greg Exp $"; #endif /* * Load measured BSDF data in PAB-Opto format. @@ -7,18 +7,22 @@ static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.5 * G. Ward */ +#define _USE_MATH_DEFINES #include #include #include #include +#include #include "platform.h" #include "bsdfrep.h" +#include "resolu.h" /* global argv[0] */ char *progname; typedef struct { const char *fname; /* input file path */ - double theta, phi; /* incident angles (in degrees) */ + double theta, phi; /* input angles */ + int igp[2]; /* input grid position */ int isDSF; /* data is DSF (rather than BSDF)? */ long dstart; /* data start offset in file */ } PGINPUT; @@ -28,20 +32,16 @@ int ninpfiles; /* number of input files */ /* Compare incident angles */ static int -cmp_inang(const void *p1, const void *p2) +cmp_indir(const void *p1, const void *p2) { const PGINPUT *inp1 = (const PGINPUT *)p1; const PGINPUT *inp2 = (const PGINPUT *)p2; + int ydif = inp1->igp[1] - inp2->igp[1]; - if (inp1->theta > inp2->theta+FTINY) - return(1); - if (inp1->theta < inp2->theta-FTINY) - return(-1); - if (inp1->phi > inp2->phi+FTINY) - return(1); - if (inp1->phi < inp2->phi-FTINY) - return(-1); - return(0); + if (ydif) + return(ydif); + + return(inp1->igp[0] - inp2->igp[0]); } /* Prepare a PAB-Opto input file by reading its header */ @@ -49,6 +49,7 @@ static int init_pabopto_inp(const int i, const char *fname) { FILE *fp = fopen(fname, "r"); + FVECT dv; char buf[2048]; int c; @@ -69,6 +70,8 @@ init_pabopto_inp(const int i, const char *fname) fclose(fp); return(0); } + if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1) + continue; if (sscanf(buf, "format: theta phi %s", typ) == 1) { if (!strcasecmp(typ, "DSF")) { inpfile[i].isDSF = 1; @@ -99,8 +102,12 @@ init_pabopto_inp(const int i, const char *fname) fputs(": unknown incident angle\n", stderr); return(0); } - while (inpfile[i].phi < 0) /* normalize phi direction */ - inpfile[i].phi += 360.; + /* convert angle to grid position */ + dv[2] = sin(M_PI/180.*inpfile[i].theta); + dv[0] = cos(M_PI/180.*inpfile[i].phi)*dv[2]; + dv[1] = sin(M_PI/180.*inpfile[i].phi)*dv[2]; + dv[2] = sqrt(1. - dv[2]*dv[2]); + pos_from_vec(inpfile[i].igp, dv); return(1); } @@ -108,9 +115,9 @@ init_pabopto_inp(const int i, const char *fname) static int add_pabopto_inp(const int i) { - FILE *fp = fopen(inpfile[i].fname, "r"); - double theta_out, phi_out, val; - int n, c; + FILE *fp = fopen(inpfile[i].fname, "r"); + double theta_out, phi_out, val; + int n, c; if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) { fputs(inpfile[i].fname, stderr); @@ -118,8 +125,8 @@ add_pabopto_inp(const int i) return(0); } /* prepare input grid */ - if (!i || cmp_inang(&inpfile[i-1], &inpfile[i])) { - if (i) /* need to process previous incidence */ + if (!i || cmp_indir(&inpfile[i-1], &inpfile[i])) { + if (i) /* process previous incidence */ make_rbfrep(); #ifdef DEBUG fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n", @@ -144,6 +151,7 @@ add_pabopto_inp(const int i) return(1); } +#ifndef TEST_MAIN /* Read in PAB-Opto BSDF files and output RBF interpolant */ int main(int argc, char *argv[]) @@ -176,7 +184,7 @@ main(int argc, char *argv[]) for (i = 0; i < ninpfiles; i++) if (!init_pabopto_inp(i, argv[i+1])) return(1); - qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_inang); + qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_indir); /* compile measurements */ for (i = 0; i < ninpfiles; i++) if (!add_pabopto_inp(i)) @@ -190,3 +198,88 @@ userr: progname); return(1); } +#else +/* Test main produces a Radiance model from the given input file */ +int +main(int argc, char *argv[]) +{ + PGINPUT pginp; + char buf[128]; + FILE *pfp; + double bsdf, min_log; + FVECT dir; + int i, j, n; + + progname = argv[0]; + if (argc != 2) { + fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname); + return(1); + } + ninpfiles = 1; + inpfile = &pginp; + if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0)) + return(1); + /* reduce data set */ + if (make_rbfrep() == NULL) { + fprintf(stderr, "%s: nothing to plot!\n", progname); + exit(1); + } +#ifdef DEBUG + fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min); +#endif + min_log = log(bsdf_min*.5 + 1e-5); +#if 1 /* produce spheres at meas. */ + puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n"); + n = 0; + for (i = 0; i < GRIDRES; i++) + for (j = 0; j < GRIDRES; j++) + if (dsf_grid[i][j].sum.n > 0) { + ovec_from_pos(dir, i, j); + bsdf = dsf_grid[i][j].sum.v / + (dsf_grid[i][j].sum.n*output_orient*dir[2]); + if (bsdf <= bsdf_min*.6) + continue; + bsdf = log(bsdf + 1e-5) - min_log; + ovec_from_pos(dir, i, j); + printf("yellow sphere s%04d\n0\n0\n", ++n); + printf("4 %.6g %.6g %.6g %.6g\n\n", + dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, + .007*bsdf); + } +#endif +#if 1 /* spheres at RBF peaks */ + puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n"); + for (n = 0; n < dsf_list->nrbf; n++) { + RBFVAL *rbf = &dsf_list->rbfa[n]; + ovec_from_pos(dir, rbf->gx, rbf->gy); + bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); + bsdf = log(bsdf + 1e-5) - min_log; + printf("red sphere p%04d\n0\n0\n", ++n); + printf("4 %.6g %.6g %.6g %.6g\n\n", + dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf, + .011*bsdf); + } +#endif +#if 1 /* output continuous surface */ + puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n"); + fflush(stdout); + sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1); + pfp = popen(buf, "w"); + if (pfp == NULL) { + fprintf(stderr, "%s: cannot open '| %s'\n", progname, buf); + return(1); + } + for (i = 0; i < GRIDRES; i++) + for (j = 0; j < GRIDRES; j++) { + ovec_from_pos(dir, i, j); + bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]); + bsdf = log(bsdf + 1e-5) - min_log; + fprintf(pfp, "%.8e %.8e %.8e\n", + dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); + } + if (pclose(pfp) != 0) + return(1); +#endif + return(0); +} +#endif