src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.31 2019/03/19 20:27:33 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#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;     /* 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             ninpfiles;      /* number of input files */

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

/* 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]);
}

/* 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");
        FVECT   dv;
        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 */
        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]);
        if (inpfile[i].theta <= FTINY)
                inpfile[i].igp[0] = inpfile[i].igp[1] = grid_res/2 - 1;
        else
                pos_from_vec(inpfile[i].igp, dv);
        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);
                        }
                if (rev_orient) {       /* reverse Z-axis to face outside */
                        theta_out = 180. - theta_out;
                        phi_out = 360. - phi_out;
                }
                add_bsdf_data(theta_out, phi_out+90.-inpfile[i].up_phi,
                                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
/* Read in PAB-Opto BSDF files and output RBF interpolant */
int
main(int argc, char *argv[])
{
        extern int      nprocs;
        int             i;
                                                /* start header */
        SET_FILE_BINARY(stdout);
        newheader("RADIANCE", stdout);
        printargs(argc, argv, stdout);
        fputnow(stdout);
        progname = argv[0];                     /* get options */
        while (argc > 2 && argv[1][0] == '-') {
                switch (argv[1][1]) {
                case 't':
                        rev_orient = !rev_orient;
                        break;
                case 'n':
                        nprocs = atoi(argv[2]);
                        argv++; argc--;
                        break;
                default:
                        goto userr;
                }
                argv++; argc--;
        }
                                                /* initialize & sort inputs */
        ninpfiles = argc - 1;
        if (ninpfiles < 2)
                goto userr;
        inpfile = (PGINPUT *)malloc(sizeof(PGINPUT)*ninpfiles);
        if (inpfile == NULL)
                return(1);
        for (i = 0; i < ninpfiles; i++)
                if (!init_pabopto_inp(i, argv[i+1]))
                        return(1);
        qsort(inpfile, ninpfiles, sizeof(PGINPUT), cmp_indir);
                                                /* compile measurements */
        for (i = 0; i < ninpfiles; i++)
                if (!add_pabopto_inp(i))
                        return(1);
        make_rbfrep();                          /* process last data set */
        build_mesh();                           /* create interpolation */
        save_bsdf_rep(stdout);                  /* write it out */
        return(0);
userr:
        fprintf(stderr, "Usage: %s [-t][-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
                                        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 < 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
Revision:	2.32
Committed:	Tue Apr 9 22:15:51 2019 UTC (5 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.31:	+1 -2 lines
Log Message:	Removed redundant debug output (already in bsdfrbf.c)
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.32	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.31 2019/03/19 20:27:33 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	2.1	#include <stdio.h>
13	greg	2.2	#include <stdlib.h>
14	greg	2.1	#include <string.h>
15			#include <ctype.h>
16	greg	2.6	#include <math.h>
17	greg	2.1	#include "platform.h"
18			#include "bsdfrep.h"
19	greg	2.15	#include "resolu.h"
20	greg	2.1	/* global argv[0] */
21			char *progname;
22
23	greg	2.2	typedef struct {
24			const char fname; / input file path */
25	greg	2.27	double theta, phi; /* input angles (degrees) */
26			double up_phi; /* azimuth for "up" direction */
27	greg	2.20	int igp[2]; /* input grid position */
28	greg	2.2	int isDSF; /* data is DSF (rather than BSDF)? */
29	greg	2.28	int nspec; /* number of spectral samples */
30	greg	2.2	long dstart; /* data start offset in file */
31			} PGINPUT;
32
33			PGINPUT inpfile; / input files sorted by incidence */
34			int ninpfiles; /* number of input files */
35
36	greg	2.29	int rev_orient = 0; /* shall we reverse surface orientation? */
37
38	greg	2.2	/* Compare incident angles */
39			static int
40	greg	2.20	cmp_indir(const void p1, const void p2)
41	greg	2.2	{
42			const PGINPUT inp1 = (const PGINPUT )p1;
43			const PGINPUT inp2 = (const PGINPUT )p2;
44	greg	2.20	int ydif = inp1->igp[1] - inp2->igp[1];
45	greg	2.2
46	greg	2.20	if (ydif)
47			return(ydif);
48
49			return(inp1->igp[0] - inp2->igp[0]);
50	greg	2.2	}
51
52			/* Prepare a PAB-Opto input file by reading its header */
53	greg	2.1	static int
54	greg	2.2	init_pabopto_inp(const int i, const char *fname)
55	greg	2.1	{
56			FILE *fp = fopen(fname, "r");
57	greg	2.20	FVECT dv;
58	greg	2.1	char buf[2048];
59	greg	2.2	int c;
60	greg	2.1
61			if (fp == NULL) {
62			fputs(fname, stderr);
63			fputs(": cannot open\n", stderr);
64			return(0);
65			}
66	greg	2.2	inpfile[i].fname = fname;
67			inpfile[i].isDSF = -1;
68	greg	2.28	inpfile[i].nspec = 0;
69	greg	2.27	inpfile[i].up_phi = 0;
70	greg	2.2	inpfile[i].theta = inpfile[i].phi = -10001.;
71	greg	2.1	/* read header information */
72			while ((c = getc(fp)) == '#' \|\| c == EOF) {
73	greg	2.28	char typ[64];
74	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
75			fputs(fname, stderr);
76			fputs(": unexpected EOF\n", stderr);
77			fclose(fp);
78			return(0);
79			}
80	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
81			continue;
82	greg	2.28	if (sscanf(buf, "colorimetry: %s", typ) == 1) {
83			if (!strcasecmp(typ, "CIE-XYZ"))
84			inpfile[i].nspec = 3;
85			else if (!strcasecmp(typ, "CIE-Y"))
86			inpfile[i].nspec = 1;
87			continue;
88			}
89	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
90	greg	2.28	if (!strcasecmp(typ, "DSF"))
91	greg	2.5	inpfile[i].isDSF = 1;
92	greg	2.28	else if (!strcasecmp(typ, "BSDF") \|\|
93	greg	2.23	!strcasecmp(typ, "BRDF") \|\|
94	greg	2.28	!strcasecmp(typ, "BTDF"))
95	greg	2.5	inpfile[i].isDSF = 0;
96	greg	2.28	continue;
97	greg	2.1	}
98	greg	2.27	if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1)
99			continue;
100	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
101	greg	2.1	continue;
102	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
103	greg	2.1	continue;
104			if (sscanf(buf, "incident_angle %lf %lf",
105	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
106	greg	2.1	continue;
107			}
108	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
109			fclose(fp);
110			if (inpfile[i].isDSF < 0) {
111	greg	2.1	fputs(fname, stderr);
112			fputs(": unknown format\n", stderr);
113			return(0);
114			}
115	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
116			fputs(fname, stderr);
117			fputs(": unknown incident angle\n", stderr);
118			return(0);
119			}
120	greg	2.29	if (rev_orient) { /* reverse Z-axis to face outside */
121			inpfile[i].theta = 180. - inpfile[i].theta;
122			inpfile[i].phi = 360. - inpfile[i].phi;
123			}
124	greg	2.27	/* convert to Y-up orientation */
125			inpfile[i].phi += 90.-inpfile[i].up_phi;
126	greg	2.20	/* convert angle to grid position */
127			dv[2] = sin(M_PI/180.*inpfile[i].theta);
128			dv[0] = cos(M_PI/180.inpfile[i].phi)dv[2];
129			dv[1] = sin(M_PI/180.inpfile[i].phi)dv[2];
130			dv[2] = sqrt(1. - dv[2]*dv[2]);
131	greg	2.30	if (inpfile[i].theta <= FTINY)
132			inpfile[i].igp[0] = inpfile[i].igp[1] = grid_res/2 - 1;
133			else
134			pos_from_vec(inpfile[i].igp, dv);
135	greg	2.2	return(1);
136			}
137
138			/* Load a set of measurements corresponding to a particular incident angle */
139			static int
140			add_pabopto_inp(const int i)
141			{
142	greg	2.19	FILE *fp = fopen(inpfile[i].fname, "r");
143	greg	2.28	double theta_out, phi_out, val[3];
144	greg	2.19	int n, c;
145	greg	2.2
146			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
147			fputs(inpfile[i].fname, stderr);
148			fputs(": cannot open\n", stderr);
149			return(0);
150			}
151	greg	2.1	/* prepare input grid */
152	greg	2.20	if (!i \|\| cmp_indir(&inpfile[i-1], &inpfile[i])) {
153			if (i) /* process previous incidence */
154	greg	2.2	make_rbfrep();
155			#ifdef DEBUG
156	greg	2.22	fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
157	greg	2.2	inpfile[i].theta, inpfile[i].phi);
158			#endif
159	greg	2.28	if (inpfile[i].nspec)
160			set_spectral_samples(inpfile[i].nspec);
161	greg	2.2	new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
162			}
163	greg	2.3	#ifdef DEBUG
164			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
165			#endif
166	greg	2.2	/* read scattering data */
167	greg	2.28	while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) {
168			for (n = 1; n < inpfile[i].nspec; n++)
169			if (fscanf(fp, "%lf", val+n) != 1) {
170			fprintf(stderr, "%s: warning: unexpected EOF\n",
171			inpfile[i].fname);
172			fclose(fp);
173			return(1);
174			}
175	greg	2.29	if (rev_orient) { /* reverse Z-axis to face outside */
176			theta_out = 180. - theta_out;
177			phi_out = 360. - phi_out;
178			}
179	greg	2.27	add_bsdf_data(theta_out, phi_out+90.-inpfile[i].up_phi,
180			val, inpfile[i].isDSF);
181	greg	2.28	}
182	greg	2.1	n = 0;
183			while ((c = getc(fp)) != EOF)
184			n += !isspace(c);
185			if (n)
186			fprintf(stderr,
187			"%s: warning: %d unexpected characters past EOD\n",
188	greg	2.2	inpfile[i].fname, n);
189	greg	2.1	fclose(fp);
190			return(1);
191			}
192
193	greg	2.8	#ifndef TEST_MAIN
194	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
195			int
196			main(int argc, char *argv[])
197			{
198			extern int nprocs;
199			int i;
200			/* start header */
201			SET_FILE_BINARY(stdout);
202			newheader("RADIANCE", stdout);
203			printargs(argc, argv, stdout);
204			fputnow(stdout);
205			progname = argv[0]; /* get options */
206			while (argc > 2 && argv[1][0] == '-') {
207			switch (argv[1][1]) {
208	greg	2.29	case 't':
209			rev_orient = !rev_orient;
210			break;
211	greg	2.1	case 'n':
212			nprocs = atoi(argv[2]);
213	greg	2.29	argv++; argc--;
214	greg	2.1	break;
215			default:
216			goto userr;
217			}
218	greg	2.29	argv++; argc--;
219	greg	2.1	}
220	greg	2.2	/* initialize & sort inputs */
221			ninpfiles = argc - 1;
222			if (ninpfiles < 2)
223	greg	2.1	goto userr;
224	greg	2.2	inpfile = (PGINPUT )malloc(sizeof(PGINPUT)ninpfiles);
225			if (inpfile == NULL)
226			return(1);
227			for (i = 0; i < ninpfiles; i++)
228			if (!init_pabopto_inp(i, argv[i+1]))
229	greg	2.1	return(1);
230	greg	2.25	qsort(inpfile, ninpfiles, sizeof(PGINPUT), cmp_indir);
231	greg	2.2	/* compile measurements */
232			for (i = 0; i < ninpfiles; i++)
233			if (!add_pabopto_inp(i))
234			return(1);
235			make_rbfrep(); /* process last data set */
236	greg	2.1	build_mesh(); /* create interpolation */
237			save_bsdf_rep(stdout); /* write it out */
238			return(0);
239			userr:
240	greg	2.29	fprintf(stderr, "Usage: %s [-t][-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
241	greg	2.1	progname);
242			return(1);
243			}
244	greg	2.6	#else
245			/* Test main produces a Radiance model from the given input file */
246			int
247			main(int argc, char *argv[])
248			{
249			PGINPUT pginp;
250			char buf[128];
251			FILE *pfp;
252			double bsdf, min_log;
253			FVECT dir;
254			int i, j, n;
255
256	greg	2.21	progname = argv[0];
257	greg	2.6	if (argc != 2) {
258	greg	2.21	fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname);
259	greg	2.6	return(1);
260			}
261			ninpfiles = 1;
262			inpfile = &pginp;
263			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
264			return(1);
265			/* reduce data set */
266	greg	2.21	if (make_rbfrep() == NULL) {
267			fprintf(stderr, "%s: nothing to plot!\n", progname);
268			exit(1);
269			}
270	greg	2.9	#ifdef DEBUG
271			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
272			#endif
273	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
274	greg	2.11	#if 1 /* produce spheres at meas. */
275	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
276			n = 0;
277	greg	2.28	for (i = 0; i < grid_res; i++)
278			for (j = 0; j < grid_res; j++)
279	greg	2.16	if (dsf_grid[i][j].sum.n > 0) {
280	greg	2.6	ovec_from_pos(dir, i, j);
281	greg	2.16	bsdf = dsf_grid[i][j].sum.v /
282	greg	2.24	((double)dsf_grid[i][j].sum.noutput_orientdir[2]);
283	greg	2.6	if (bsdf <= bsdf_min*.6)
284			continue;
285	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
286	greg	2.7	ovec_from_pos(dir, i, j);
287			printf("yellow sphere s%04d\n0\n0\n", ++n);
288			printf("4 %.6g %.6g %.6g %.6g\n\n",
289	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
290	greg	2.7	.007*bsdf);
291	greg	2.6	}
292	greg	2.11	#endif
293			#if 1 /* spheres at RBF peaks */
294			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
295			for (n = 0; n < dsf_list->nrbf; n++) {
296			RBFVAL *rbf = &dsf_list->rbfa[n];
297			ovec_from_pos(dir, rbf->gx, rbf->gy);
298	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
299	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
300	greg	2.11	printf("red sphere p%04d\n0\n0\n", ++n);
301			printf("4 %.6g %.6g %.6g %.6g\n\n",
302			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
303			.011*bsdf);
304			}
305			#endif
306			#if 1 /* output continuous surface */
307	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
308			fflush(stdout);
309	greg	2.28	sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1);
310	greg	2.6	pfp = popen(buf, "w");
311			if (pfp == NULL) {
312	greg	2.21	fprintf(stderr, "%s: cannot open '\| %s'\n", progname, buf);
313	greg	2.6	return(1);
314			}
315	greg	2.28	for (i = 0; i < grid_res; i++)
316			for (j = 0; j < grid_res; j++) {
317	greg	2.6	ovec_from_pos(dir, i, j);
318	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
319	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
320	greg	2.6	fprintf(pfp, "%.8e %.8e %.8e\n",
321			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
322			}
323	greg	2.11	if (pclose(pfp) != 0)
324			return(1);
325			#endif
326			return(0);
327	greg	2.6	}
328			#endif