src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.43 2025/06/03 21:31:51 greg Exp $";
#endif
/*
 * Load measured BSDF data in PAB-Opto format.
 * Assumes that surface-normal (Z-axis) faces into room unless -t option given.
 *
 *      G. Ward
 */

#define _USE_MATH_DEFINES
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include "rtio.h"
#include "bsdfrep.h"

typedef struct {
        const char      *fname;         /* input file path */
        double          theta, phi;     /* input angles (degrees) */
        double          up_phi;         /* azimuth for "up" direction */
        int             igp[2];         /* input grid position */
        int             isDSF;          /* data is DSF (rather than BSDF)? */
        int             nspec;          /* number of spectral samples */
        long            dstart;         /* data start offset in file */
} PGINPUT;

PGINPUT         *inpfile;       /* input files sorted by incidence */

int             rev_orient = 0; /* shall we reverse surface orientation? */

double          lim_graze = 0;  /* limit scattering near grazing (deg above) */

/* Compare incident angles */
static int
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 (ydif)
                return(ydif);

        return(inp1->igp[0] - inp2->igp[0]);
}

/* Assign grid position from theta and phi */
static void
set_grid_pos(PGINPUT *pip)
{
        FVECT   dv;

        if (pip->theta <= FTINY) {
                pip->igp[0] = pip->igp[1] = grid_res/2 - 1;
                return;
        }
        dv[2] = sin(M_PI/180.*pip->theta);
        dv[0] = cos(M_PI/180.*pip->phi)*dv[2];
        dv[1] = sin(M_PI/180.*pip->phi)*dv[2];
        dv[2] = sqrt(1. - dv[2]*dv[2]);
        pos_from_vec(pip->igp, dv);
}

/* Prepare a PAB-Opto input file by reading its header */
static int
init_pabopto_inp(const int i, const char *fname)
{
        FILE    *fp = fopen(fname, "r");
        char    buf[2048];
        int     c;
        
        if (fp == NULL) {
                fputs(fname, stderr);
                fputs(": cannot open\n", stderr);
                return(0);
        }
        inpfile[i].fname = fname;
        inpfile[i].isDSF = -1;
        inpfile[i].nspec = 0;
        inpfile[i].up_phi = 0;
        inpfile[i].theta = inpfile[i].phi = -10001.;
                                /* read header information */
        while ((c = getc(fp)) == '#' || c == EOF) {
                char    typ[64];
                if (fgets(buf, sizeof(buf), fp) == NULL) {
                        fputs(fname, stderr);
                        fputs(": unexpected EOF\n", stderr);
                        fclose(fp);
                        return(0);
                }
                if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
                        continue;
                if (sscanf(buf, "colorimetry: %s", typ) == 1) {
                        if (!strcasecmp(typ, "CIE-XYZ"))
                                inpfile[i].nspec = 3;
                        else if (!strcasecmp(typ, "CIE-Y"))
                                inpfile[i].nspec = 1;
                        continue;
                }
                if (sscanf(buf, "format: theta phi %s", typ) == 1) {
                        if (!strcasecmp(typ, "DSF"))
                                inpfile[i].isDSF = 1;
                        else if (!strcasecmp(typ, "BSDF") ||
                                        !strcasecmp(typ, "BRDF") ||
                                        !strcasecmp(typ, "BTDF"))
                                inpfile[i].isDSF = 0;
                        continue;
                }
                if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1)
                        continue;
                if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
                        continue;
                if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
                        continue;
                if (sscanf(buf, "incident_angle %lf %lf",
                                &inpfile[i].theta, &inpfile[i].phi) == 2)
                        continue;
        }
        inpfile[i].dstart = ftell(fp) - 1;
        fclose(fp);
        if (inpfile[i].isDSF < 0) {
                fputs(fname, stderr);
                fputs(": unknown format\n", stderr);
                return(0);
        }
        if ((inpfile[i].theta < -10000.) | (inpfile[i].phi < -10000.)) {
                fputs(fname, stderr);
                fputs(": unknown incident angle\n", stderr);
                return(0);
        }
        if (rev_orient) {       /* reverse Z-axis to face outside */
                inpfile[i].theta = 180. - inpfile[i].theta;
                inpfile[i].phi = 360. - inpfile[i].phi;
        }
                                /* convert to Y-up orientation */
        inpfile[i].phi += 90.-inpfile[i].up_phi;
                                /* convert angle to grid position */
        set_grid_pos(&inpfile[i]);
        return(1);
}

/* Load a set of measurements corresponding to a particular incident angle */
static int
add_pabopto_inp(const int i)
{
        FILE            *fp = fopen(inpfile[i].fname, "r");
        double          theta_out, phi_out, val[3];
        int             n, c;
        
        if (fp == NULL || fseek(fp, inpfile[i].dstart, 0) == EOF) {
                fputs(inpfile[i].fname, stderr);
                fputs(": cannot open\n", stderr);
                return(0);
        }
                                        /* prepare input grid */
        if (!i || cmp_indir(&inpfile[i-1], &inpfile[i])) {
                if (i)                  /* process previous incidence */
                        make_rbfrep();
#ifdef DEBUG
                fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
                                        inpfile[i].theta, inpfile[i].phi);
#endif
                if (inpfile[i].nspec)
                        set_spectral_samples(inpfile[i].nspec);
                new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
        }
#ifdef DEBUG
        fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
#endif
                                        /* read scattering data */
        while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) {
                for (n = 1; n < inpfile[i].nspec; n++)
                        if (fscanf(fp, "%lf", val+n) != 1) {
                                fprintf(stderr, "%s: warning: unexpected EOF\n",
                                                inpfile[i].fname);
                                fclose(fp);
                                return(1);
                        }
                                        /* check if scatter angle is too low */
                if (fabs(theta_out - 90.) < lim_graze-FTINY)
                        continue;
                if (rev_orient) {       /* reverse Z-axis to face outside? */
                        theta_out = 180. - theta_out;
                        phi_out = 360. - phi_out;
                }
                phi_out += 90.-inpfile[i].up_phi;
                add_bsdf_data(theta_out, phi_out, val, inpfile[i].isDSF);
        }
        n = 0;
        while ((c = getc(fp)) != EOF)
                n += !isspace(c);
        if (n) 
                fprintf(stderr,
                        "%s: warning: %d unexpected characters past EOD\n",
                                inpfile[i].fname, n);
        fclose(fp);
        return(1);
}

#ifndef TEST_MAIN

#define SYM_ILL         '?'             /* illegal symmetry value */
#define SYM_ISO         'I'             /* isotropic */
#define SYM_QUAD        'Q'             /* quadrilateral symmetry */
#define SYM_BILAT       'B'             /* bilateral symmetry */
#define SYM_ANISO       'A'             /* anisotropic */
#define SYM_UP          'U'             /* "up-down" (180°) symmetry */

static const char       quadrant_rep[16][16] = {
                                "in-plane","0-90","90-180","0-180",
                                "180-270","0-90+180-270","90-270",
                                "0-270","270-360","270-90",
                                "90-180+270-360","270-180","180-360",
                                "180-90","90-360","0-360"
                        };
static const char       quadrant_sym[16] = {
                                SYM_ISO, SYM_QUAD, SYM_QUAD, SYM_BILAT,
                                SYM_QUAD, SYM_ILL, SYM_BILAT, SYM_ILL,
                                SYM_QUAD, SYM_BILAT, SYM_ILL, SYM_ILL,
                                SYM_BILAT, SYM_ILL, SYM_ILL, SYM_ANISO
                        };

/* Read in PAB-Opto BSDF files and output RBF interpolant */
int
main(int argc, char *argv[])
{
        extern int      nprocs;
        static char     gval_buf[16];
        char *          auto_grazing = NULL;
        const char      *symmetry = "0";
        int             ninpfiles, totinc;
        int             a, i;
                                        /* set global progname */
        fixargv0(argv[0]);
                                        /* get options */
        for (a = 1; a < argc && argv[a][0] == '-'; a++)
                switch (argv[a][1]) {
                case 't':
                        rev_orient = !rev_orient;
                        break;
                case 'n':
                        nprocs = atoi(argv[++a]);
                        break;
                case 's':
                        symmetry = argv[++a];
                        break;
                case 'g':
                        if (toupper(argv[a+1][0]) == 'A')
                                auto_grazing = argv[a+1] = gval_buf;
                        else
                                lim_graze = atof(argv[a+1]);
                        ++a;
                        break;
                default:
                        goto userr;
                }
        totinc = ninpfiles = argc - a;          /* initialize & sort inputs */
        if (ninpfiles < 2)
                goto userr;
        if (toupper(symmetry[0]) == SYM_UP)     /* special case for "up" symmetry */
                totinc += ninpfiles;
        inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*totinc);
        if (inpfile == NULL)
                return(1);
        if (auto_grazing)
                lim_graze = 90.;
        for (i = 0; i < ninpfiles; i++) {
                if (!init_pabopto_inp(i, argv[a+i]))
                        return(1);
                if (auto_grazing && fabs(inpfile[i].theta - 90.) < lim_graze)
                        lim_graze = fabs(inpfile[i].theta - 90.);
        }
        if (auto_grazing)
                sprintf(auto_grazing, "%.2f", lim_graze);
        for (i = ninpfiles; i < totinc; i++) {  /* copy for "up" symmetry */
                inpfile[i] = inpfile[i-ninpfiles];
                inpfile[i].phi += 180.;         /* invert duplicate data */
                inpfile[i].up_phi -= 180.;
                set_grid_pos(&inpfile[i]);      /* grid location for sorting */
        }
        qsort(inpfile, totinc, sizeof(PGINPUT), cmp_indir);
                                                /* compile measurements */
        for (i = 0; i < totinc; i++)
                if (!add_pabopto_inp(i))
                        return(1);
        make_rbfrep();                          /* process last data set */
                                                /* check input symmetry */
        switch (toupper(symmetry[0])) {
        case '0':                               /* unspecified symmetry */
                if (quadrant_sym[inp_coverage] != SYM_ILL)
                        break;                  /* anything legal goes */
                fprintf(stderr, "%s: unsupported phi coverage (%s)\n",
                                progname, quadrant_rep[inp_coverage]);
                return(1);
        case SYM_UP:                            /* faux "up" symmetry */
                if (quadrant_sym[inp_coverage] == SYM_ANISO)
                        break;
                /* fall through */
        case SYM_ISO:                           /* usual symmetry types */
        case SYM_QUAD:
        case SYM_BILAT:
        case SYM_ANISO:
                if (quadrant_sym[inp_coverage] == toupper(symmetry[0]))
                        break;                  /* matches spec */
                fprintf(stderr,
                "%s: phi coverage (%s) does not match requested '%s' symmetry\n",
                                progname, quadrant_rep[inp_coverage], symmetry);
                return(1);
        default:
                fprintf(stderr,
  "%s: -s option must be Isotropic, Quadrilateral, Bilateral, Up, or Anisotropic\n",
                                progname);
                return(1);
        }
#ifdef DEBUG
        fprintf(stderr, "Input phi coverage (%s) has '%c' symmetry\n",
                                quadrant_rep[inp_coverage],
                                quadrant_sym[inp_coverage]);
#endif
        build_mesh();                           /* create interpolation */
        SET_FILE_BINARY(stdout);                /* start header */
        newheader("RADIANCE", stdout);
        printargs(argc, argv, stdout);
        fputnow(stdout);
        save_bsdf_rep(stdout);                  /* complete header + data */
        return(0);
userr:
        fprintf(stderr, "Usage: %s [-t][-n nproc][-s symmetry][-g angle|'A'] meas1.dat meas2.dat .. > bsdf.sir\n",
                                        progname);
        return(1);
}

#else           /* TEST_MAIN */

/* 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);
        }
        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 < grid_res; i++)
            for (j = 0; j < grid_res; j++)
                if (dsf_grid[i][j].sum.n > 0) {
                        ovec_from_pos(dir, i, j);
                        bsdf = dsf_grid[i][j].sum.v /
                           ((double)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);
                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", grid_res-1, grid_res-1);
        pfp = popen(buf, "w");
        if (pfp == NULL) {
                fprintf(stderr, "%s: cannot open '| %s'\n", progname, buf);
                return(1);
        }
        for (i = 0; i < grid_res; i++)
            for (j = 0; j < grid_res; j++) {
                ovec_from_pos(dir, i, j);
                bsdf = eval_rbfrep(dsf_list, dir);
                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          /* TEST_MAIN */
Revision:	2.44
Committed:	Sat Jun 7 05:09:45 2025 UTC (8 hours, 16 minutes ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.43:	+1 -3 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.44	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.43 2025/06/03 21:31:51 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Load measured BSDF data in PAB-Opto format.
6	greg	2.29	* Assumes that surface-normal (Z-axis) faces into room unless -t option given.
7	greg	2.1	*
8			* G. Ward
9			*/
10
11	greg	2.20	#define _USE_MATH_DEFINES
12	greg	2.2	#include <stdlib.h>
13	greg	2.1	#include <ctype.h>
14	greg	2.6	#include <math.h>
15	greg	2.36	#include "rtio.h"
16	greg	2.1	#include "bsdfrep.h"
17
18	greg	2.2	typedef struct {
19			const char fname; / input file path */
20	greg	2.27	double theta, phi; /* input angles (degrees) */
21			double up_phi; /* azimuth for "up" direction */
22	greg	2.20	int igp[2]; /* input grid position */
23	greg	2.2	int isDSF; /* data is DSF (rather than BSDF)? */
24	greg	2.28	int nspec; /* number of spectral samples */
25	greg	2.2	long dstart; /* data start offset in file */
26			} PGINPUT;
27
28			PGINPUT inpfile; / input files sorted by incidence */
29
30	greg	2.29	int rev_orient = 0; /* shall we reverse surface orientation? */
31
32	greg	2.40	double lim_graze = 0; /* limit scattering near grazing (deg above) */
33
34	greg	2.2	/* Compare incident angles */
35			static int
36	greg	2.20	cmp_indir(const void p1, const void p2)
37	greg	2.2	{
38			const PGINPUT inp1 = (const PGINPUT )p1;
39			const PGINPUT inp2 = (const PGINPUT )p2;
40	greg	2.20	int ydif = inp1->igp[1] - inp2->igp[1];
41	greg	2.2
42	greg	2.20	if (ydif)
43			return(ydif);
44
45			return(inp1->igp[0] - inp2->igp[0]);
46	greg	2.2	}
47
48	greg	2.37	/* Assign grid position from theta and phi */
49			static void
50			set_grid_pos(PGINPUT *pip)
51			{
52			FVECT dv;
53
54			if (pip->theta <= FTINY) {
55			pip->igp[0] = pip->igp[1] = grid_res/2 - 1;
56			return;
57			}
58			dv[2] = sin(M_PI/180.*pip->theta);
59			dv[0] = cos(M_PI/180.pip->phi)dv[2];
60			dv[1] = sin(M_PI/180.pip->phi)dv[2];
61			dv[2] = sqrt(1. - dv[2]*dv[2]);
62			pos_from_vec(pip->igp, dv);
63			}
64
65	greg	2.2	/* Prepare a PAB-Opto input file by reading its header */
66	greg	2.1	static int
67	greg	2.2	init_pabopto_inp(const int i, const char *fname)
68	greg	2.1	{
69			FILE *fp = fopen(fname, "r");
70			char buf[2048];
71	greg	2.2	int c;
72	greg	2.1
73			if (fp == NULL) {
74			fputs(fname, stderr);
75			fputs(": cannot open\n", stderr);
76			return(0);
77			}
78	greg	2.2	inpfile[i].fname = fname;
79			inpfile[i].isDSF = -1;
80	greg	2.28	inpfile[i].nspec = 0;
81	greg	2.27	inpfile[i].up_phi = 0;
82	greg	2.2	inpfile[i].theta = inpfile[i].phi = -10001.;
83	greg	2.1	/* read header information */
84			while ((c = getc(fp)) == '#' \|\| c == EOF) {
85	greg	2.28	char typ[64];
86	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
87			fputs(fname, stderr);
88			fputs(": unexpected EOF\n", stderr);
89			fclose(fp);
90			return(0);
91			}
92	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
93			continue;
94	greg	2.28	if (sscanf(buf, "colorimetry: %s", typ) == 1) {
95			if (!strcasecmp(typ, "CIE-XYZ"))
96			inpfile[i].nspec = 3;
97			else if (!strcasecmp(typ, "CIE-Y"))
98			inpfile[i].nspec = 1;
99			continue;
100			}
101	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
102	greg	2.28	if (!strcasecmp(typ, "DSF"))
103	greg	2.5	inpfile[i].isDSF = 1;
104	greg	2.28	else if (!strcasecmp(typ, "BSDF") \|\|
105	greg	2.23	!strcasecmp(typ, "BRDF") \|\|
106	greg	2.28	!strcasecmp(typ, "BTDF"))
107	greg	2.5	inpfile[i].isDSF = 0;
108	greg	2.28	continue;
109	greg	2.1	}
110	greg	2.27	if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1)
111			continue;
112	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
113	greg	2.1	continue;
114	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
115	greg	2.1	continue;
116			if (sscanf(buf, "incident_angle %lf %lf",
117	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
118	greg	2.1	continue;
119			}
120	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
121			fclose(fp);
122			if (inpfile[i].isDSF < 0) {
123	greg	2.1	fputs(fname, stderr);
124			fputs(": unknown format\n", stderr);
125			return(0);
126			}
127	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
128			fputs(fname, stderr);
129			fputs(": unknown incident angle\n", stderr);
130			return(0);
131			}
132	greg	2.29	if (rev_orient) { /* reverse Z-axis to face outside */
133			inpfile[i].theta = 180. - inpfile[i].theta;
134			inpfile[i].phi = 360. - inpfile[i].phi;
135			}
136	greg	2.27	/* convert to Y-up orientation */
137			inpfile[i].phi += 90.-inpfile[i].up_phi;
138	greg	2.20	/* convert angle to grid position */
139	greg	2.37	set_grid_pos(&inpfile[i]);
140	greg	2.2	return(1);
141			}
142
143			/* Load a set of measurements corresponding to a particular incident angle */
144			static int
145			add_pabopto_inp(const int i)
146			{
147	greg	2.19	FILE *fp = fopen(inpfile[i].fname, "r");
148	greg	2.28	double theta_out, phi_out, val[3];
149	greg	2.19	int n, c;
150	greg	2.2
151			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
152			fputs(inpfile[i].fname, stderr);
153			fputs(": cannot open\n", stderr);
154			return(0);
155			}
156	greg	2.1	/* prepare input grid */
157	greg	2.20	if (!i \|\| cmp_indir(&inpfile[i-1], &inpfile[i])) {
158			if (i) /* process previous incidence */
159	greg	2.2	make_rbfrep();
160			#ifdef DEBUG
161	greg	2.22	fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
162	greg	2.2	inpfile[i].theta, inpfile[i].phi);
163			#endif
164	greg	2.28	if (inpfile[i].nspec)
165			set_spectral_samples(inpfile[i].nspec);
166	greg	2.2	new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
167			}
168	greg	2.3	#ifdef DEBUG
169			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
170			#endif
171	greg	2.2	/* read scattering data */
172	greg	2.28	while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) {
173			for (n = 1; n < inpfile[i].nspec; n++)
174			if (fscanf(fp, "%lf", val+n) != 1) {
175			fprintf(stderr, "%s: warning: unexpected EOF\n",
176			inpfile[i].fname);
177			fclose(fp);
178			return(1);
179			}
180	greg	2.40	/* check if scatter angle is too low */
181			if (fabs(theta_out - 90.) < lim_graze-FTINY)
182			continue;
183			if (rev_orient) { /* reverse Z-axis to face outside? */
184	greg	2.29	theta_out = 180. - theta_out;
185			phi_out = 360. - phi_out;
186			}
187	greg	2.37	phi_out += 90.-inpfile[i].up_phi;
188			add_bsdf_data(theta_out, phi_out, val, inpfile[i].isDSF);
189	greg	2.28	}
190	greg	2.1	n = 0;
191			while ((c = getc(fp)) != EOF)
192			n += !isspace(c);
193			if (n)
194			fprintf(stderr,
195			"%s: warning: %d unexpected characters past EOD\n",
196	greg	2.2	inpfile[i].fname, n);
197	greg	2.1	fclose(fp);
198			return(1);
199			}
200
201	greg	2.8	#ifndef TEST_MAIN
202	greg	2.35
203			#define SYM_ILL '?' /* illegal symmetry value */
204			#define SYM_ISO 'I' /* isotropic */
205			#define SYM_QUAD 'Q' /* quadrilateral symmetry */
206			#define SYM_BILAT 'B' /* bilateral symmetry */
207			#define SYM_ANISO 'A' /* anisotropic */
208	greg	2.37	#define SYM_UP 'U' /* "up-down" (180°) symmetry */
209	greg	2.35
210			static const char quadrant_rep[16][16] = {
211			"in-plane","0-90","90-180","0-180",
212			"180-270","0-90+180-270","90-270",
213			"0-270","270-360","270-90",
214			"90-180+270-360","270-180","180-360",
215			"180-90","90-360","0-360"
216			};
217			static const char quadrant_sym[16] = {
218			SYM_ISO, SYM_QUAD, SYM_QUAD, SYM_BILAT,
219			SYM_QUAD, SYM_ILL, SYM_BILAT, SYM_ILL,
220			SYM_QUAD, SYM_BILAT, SYM_ILL, SYM_ILL,
221			SYM_BILAT, SYM_ILL, SYM_ILL, SYM_ANISO
222			};
223
224	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
225			int
226			main(int argc, char *argv[])
227			{
228	greg	2.35	extern int nprocs;
229	greg	2.41	static char gval_buf[16];
230			char * auto_grazing = NULL;
231	greg	2.37	const char *symmetry = "0";
232			int ninpfiles, totinc;
233			int a, i;
234	greg	2.43	/* set global progname */
235			fixargv0(argv[0]);
236			/* get options */
237	greg	2.37	for (a = 1; a < argc && argv[a][0] == '-'; a++)
238			switch (argv[a][1]) {
239	greg	2.29	case 't':
240			rev_orient = !rev_orient;
241			break;
242	greg	2.1	case 'n':
243	greg	2.37	nprocs = atoi(argv[++a]);
244	greg	2.1	break;
245	greg	2.33	case 's':
246	greg	2.37	symmetry = argv[++a];
247	greg	2.33	break;
248	greg	2.40	case 'g':
249			if (toupper(argv[a+1][0]) == 'A')
250	greg	2.41	auto_grazing = argv[a+1] = gval_buf;
251	greg	2.40	else
252			lim_graze = atof(argv[a+1]);
253			++a;
254			break;
255	greg	2.1	default:
256			goto userr;
257			}
258	greg	2.37	totinc = ninpfiles = argc - a; /* initialize & sort inputs */
259	greg	2.2	if (ninpfiles < 2)
260	greg	2.1	goto userr;
261	greg	2.37	if (toupper(symmetry[0]) == SYM_UP) /* special case for "up" symmetry */
262			totinc += ninpfiles;
263			inpfile = (PGINPUT )malloc(sizeof(PGINPUT)totinc);
264	greg	2.2	if (inpfile == NULL)
265			return(1);
266	greg	2.40	if (auto_grazing)
267			lim_graze = 90.;
268			for (i = 0; i < ninpfiles; i++) {
269	greg	2.37	if (!init_pabopto_inp(i, argv[a+i]))
270	greg	2.1	return(1);
271	greg	2.40	if (auto_grazing && fabs(inpfile[i].theta - 90.) < lim_graze)
272			lim_graze = fabs(inpfile[i].theta - 90.);
273			}
274	greg	2.41	if (auto_grazing)
275			sprintf(auto_grazing, "%.2f", lim_graze);
276	greg	2.37	for (i = ninpfiles; i < totinc; i++) { /* copy for "up" symmetry */
277			inpfile[i] = inpfile[i-ninpfiles];
278			inpfile[i].phi += 180.; /* invert duplicate data */
279			inpfile[i].up_phi -= 180.;
280			set_grid_pos(&inpfile[i]); /* grid location for sorting */
281			}
282	greg	2.38	qsort(inpfile, totinc, sizeof(PGINPUT), cmp_indir);
283	greg	2.2	/* compile measurements */
284	greg	2.37	for (i = 0; i < totinc; i++)
285	greg	2.2	if (!add_pabopto_inp(i))
286			return(1);
287			make_rbfrep(); /* process last data set */
288	greg	2.33	/* check input symmetry */
289			switch (toupper(symmetry[0])) {
290	greg	2.37	case '0': /* unspecified symmetry */
291	greg	2.35	if (quadrant_sym[inp_coverage] != SYM_ILL)
292			break; /* anything legal goes */
293			fprintf(stderr, "%s: unsupported phi coverage (%s)\n",
294			progname, quadrant_rep[inp_coverage]);
295			return(1);
296	greg	2.37	case SYM_UP: /* faux "up" symmetry */
297			if (quadrant_sym[inp_coverage] == SYM_ANISO)
298			break;
299			/* fall through */
300			case SYM_ISO: /* usual symmetry types */
301	greg	2.35	case SYM_QUAD:
302			case SYM_BILAT:
303			case SYM_ANISO:
304			if (quadrant_sym[inp_coverage] == toupper(symmetry[0]))
305			break; /* matches spec */
306			fprintf(stderr,
307			"%s: phi coverage (%s) does not match requested '%s' symmetry\n",
308			progname, quadrant_rep[inp_coverage], symmetry);
309			return(1);
310	greg	2.33	default:
311			fprintf(stderr,
312	greg	2.37	"%s: -s option must be Isotropic, Quadrilateral, Bilateral, Up, or Anisotropic\n",
313	greg	2.33	progname);
314			return(1);
315			}
316			#ifdef DEBUG
317	greg	2.35	fprintf(stderr, "Input phi coverage (%s) has '%c' symmetry\n",
318			quadrant_rep[inp_coverage],
319			quadrant_sym[inp_coverage]);
320	greg	2.33	#endif
321	greg	2.1	build_mesh(); /* create interpolation */
322	greg	2.39	SET_FILE_BINARY(stdout); /* start header */
323			newheader("RADIANCE", stdout);
324			printargs(argc, argv, stdout);
325			fputnow(stdout);
326			save_bsdf_rep(stdout); /* complete header + data */
327	greg	2.1	return(0);
328			userr:
329	greg	2.40	fprintf(stderr, "Usage: %s [-t][-n nproc][-s symmetry][-g angle\|'A'] meas1.dat meas2.dat .. > bsdf.sir\n",
330	greg	2.1	progname);
331			return(1);
332			}
333	greg	2.35
334			#else /* TEST_MAIN */
335
336	greg	2.6	/* Test main produces a Radiance model from the given input file */
337			int
338			main(int argc, char *argv[])
339			{
340			PGINPUT pginp;
341			char buf[128];
342			FILE *pfp;
343			double bsdf, min_log;
344			FVECT dir;
345			int i, j, n;
346
347	greg	2.21	progname = argv[0];
348	greg	2.6	if (argc != 2) {
349	greg	2.21	fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname);
350	greg	2.6	return(1);
351			}
352			inpfile = &pginp;
353			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
354			return(1);
355			/* reduce data set */
356	greg	2.21	if (make_rbfrep() == NULL) {
357			fprintf(stderr, "%s: nothing to plot!\n", progname);
358			exit(1);
359			}
360	greg	2.9	#ifdef DEBUG
361			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
362			#endif
363	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
364	greg	2.11	#if 1 /* produce spheres at meas. */
365	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
366			n = 0;
367	greg	2.28	for (i = 0; i < grid_res; i++)
368			for (j = 0; j < grid_res; j++)
369	greg	2.16	if (dsf_grid[i][j].sum.n > 0) {
370	greg	2.6	ovec_from_pos(dir, i, j);
371	greg	2.16	bsdf = dsf_grid[i][j].sum.v /
372	greg	2.24	((double)dsf_grid[i][j].sum.noutput_orientdir[2]);
373	greg	2.6	if (bsdf <= bsdf_min*.6)
374			continue;
375	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
376	greg	2.7	ovec_from_pos(dir, i, j);
377			printf("yellow sphere s%04d\n0\n0\n", ++n);
378			printf("4 %.6g %.6g %.6g %.6g\n\n",
379	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
380	greg	2.7	.007*bsdf);
381	greg	2.6	}
382	greg	2.11	#endif
383			#if 1 /* spheres at RBF peaks */
384			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
385			for (n = 0; n < dsf_list->nrbf; n++) {
386			RBFVAL *rbf = &dsf_list->rbfa[n];
387			ovec_from_pos(dir, rbf->gx, rbf->gy);
388	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
389	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
390	greg	2.11	printf("red sphere p%04d\n0\n0\n", ++n);
391			printf("4 %.6g %.6g %.6g %.6g\n\n",
392			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
393			.011*bsdf);
394			}
395			#endif
396			#if 1 /* output continuous surface */
397	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
398			fflush(stdout);
399	greg	2.28	sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1);
400	greg	2.6	pfp = popen(buf, "w");
401			if (pfp == NULL) {
402	greg	2.21	fprintf(stderr, "%s: cannot open '\| %s'\n", progname, buf);
403	greg	2.6	return(1);
404			}
405	greg	2.28	for (i = 0; i < grid_res; i++)
406			for (j = 0; j < grid_res; j++) {
407	greg	2.6	ovec_from_pos(dir, i, j);
408	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
409	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
410	greg	2.6	fprintf(pfp, "%.8e %.8e %.8e\n",
411			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
412			}
413	greg	2.11	if (pclose(pfp) != 0)
414			return(1);
415			#endif
416			return(0);
417	greg	2.6	}
418	greg	2.35
419			#endif /* TEST_MAIN */