src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.27 2014/10/03 21:57:06 greg Exp $";
#endif
/*
 * Load measured BSDF data in PAB-Opto format.
 *
 *      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 */

/* 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);
        }
                                /* 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]);
        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);
                        }
                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 'n':
                        nprocs = atoi(argv[2]);
                        break;
                default:
                        goto userr;
                }
                argv += 2; argc -= 2;
        }
                                                /* 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 [-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:	2.28
Committed:	Fri Jan 29 16:21:56 2016 UTC (8 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.27:	+32 -16 lines
Log Message:	Updated pabopto2bsdf to handle tristimulus color -- change in .sir format
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.28	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.27 2014/10/03 21:57:06 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Load measured BSDF data in PAB-Opto format.
6			*
7			* G. Ward
8			*/
9
10	greg	2.20	#define _USE_MATH_DEFINES
11	greg	2.1	#include <stdio.h>
12	greg	2.2	#include <stdlib.h>
13	greg	2.1	#include <string.h>
14			#include <ctype.h>
15	greg	2.6	#include <math.h>
16	greg	2.1	#include "platform.h"
17			#include "bsdfrep.h"
18	greg	2.15	#include "resolu.h"
19	greg	2.1	/* global argv[0] */
20			char *progname;
21
22	greg	2.2	typedef struct {
23			const char fname; / input file path */
24	greg	2.27	double theta, phi; /* input angles (degrees) */
25			double up_phi; /* azimuth for "up" direction */
26	greg	2.20	int igp[2]; /* input grid position */
27	greg	2.2	int isDSF; /* data is DSF (rather than BSDF)? */
28	greg	2.28	int nspec; /* number of spectral samples */
29	greg	2.2	long dstart; /* data start offset in file */
30			} PGINPUT;
31
32			PGINPUT inpfile; / input files sorted by incidence */
33			int ninpfiles; /* number of input files */
34
35			/* Compare incident angles */
36			static int
37	greg	2.20	cmp_indir(const void p1, const void p2)
38	greg	2.2	{
39			const PGINPUT inp1 = (const PGINPUT )p1;
40			const PGINPUT inp2 = (const PGINPUT )p2;
41	greg	2.20	int ydif = inp1->igp[1] - inp2->igp[1];
42	greg	2.2
43	greg	2.20	if (ydif)
44			return(ydif);
45
46			return(inp1->igp[0] - inp2->igp[0]);
47	greg	2.2	}
48
49			/* Prepare a PAB-Opto input file by reading its header */
50	greg	2.1	static int
51	greg	2.2	init_pabopto_inp(const int i, const char *fname)
52	greg	2.1	{
53			FILE *fp = fopen(fname, "r");
54	greg	2.20	FVECT dv;
55	greg	2.1	char buf[2048];
56	greg	2.2	int c;
57	greg	2.1
58			if (fp == NULL) {
59			fputs(fname, stderr);
60			fputs(": cannot open\n", stderr);
61			return(0);
62			}
63	greg	2.2	inpfile[i].fname = fname;
64			inpfile[i].isDSF = -1;
65	greg	2.28	inpfile[i].nspec = 0;
66	greg	2.27	inpfile[i].up_phi = 0;
67	greg	2.2	inpfile[i].theta = inpfile[i].phi = -10001.;
68	greg	2.1	/* read header information */
69			while ((c = getc(fp)) == '#' \|\| c == EOF) {
70	greg	2.28	char typ[64];
71	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
72			fputs(fname, stderr);
73			fputs(": unexpected EOF\n", stderr);
74			fclose(fp);
75			return(0);
76			}
77	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
78			continue;
79	greg	2.28	if (sscanf(buf, "colorimetry: %s", typ) == 1) {
80			if (!strcasecmp(typ, "CIE-XYZ"))
81			inpfile[i].nspec = 3;
82			else if (!strcasecmp(typ, "CIE-Y"))
83			inpfile[i].nspec = 1;
84			continue;
85			}
86	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
87	greg	2.28	if (!strcasecmp(typ, "DSF"))
88	greg	2.5	inpfile[i].isDSF = 1;
89	greg	2.28	else if (!strcasecmp(typ, "BSDF") \|\|
90	greg	2.23	!strcasecmp(typ, "BRDF") \|\|
91	greg	2.28	!strcasecmp(typ, "BTDF"))
92	greg	2.5	inpfile[i].isDSF = 0;
93	greg	2.28	continue;
94	greg	2.1	}
95	greg	2.27	if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1)
96			continue;
97	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
98	greg	2.1	continue;
99	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
100	greg	2.1	continue;
101			if (sscanf(buf, "incident_angle %lf %lf",
102	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
103	greg	2.1	continue;
104			}
105	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
106			fclose(fp);
107			if (inpfile[i].isDSF < 0) {
108	greg	2.1	fputs(fname, stderr);
109			fputs(": unknown format\n", stderr);
110			return(0);
111			}
112	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
113			fputs(fname, stderr);
114			fputs(": unknown incident angle\n", stderr);
115			return(0);
116			}
117	greg	2.27	/* convert to Y-up orientation */
118			inpfile[i].phi += 90.-inpfile[i].up_phi;
119	greg	2.20	/* convert angle to grid position */
120			dv[2] = sin(M_PI/180.*inpfile[i].theta);
121			dv[0] = cos(M_PI/180.inpfile[i].phi)dv[2];
122			dv[1] = sin(M_PI/180.inpfile[i].phi)dv[2];
123			dv[2] = sqrt(1. - dv[2]*dv[2]);
124			pos_from_vec(inpfile[i].igp, dv);
125	greg	2.2	return(1);
126			}
127
128			/* Load a set of measurements corresponding to a particular incident angle */
129			static int
130			add_pabopto_inp(const int i)
131			{
132	greg	2.19	FILE *fp = fopen(inpfile[i].fname, "r");
133	greg	2.28	double theta_out, phi_out, val[3];
134	greg	2.19	int n, c;
135	greg	2.2
136			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
137			fputs(inpfile[i].fname, stderr);
138			fputs(": cannot open\n", stderr);
139			return(0);
140			}
141	greg	2.1	/* prepare input grid */
142	greg	2.20	if (!i \|\| cmp_indir(&inpfile[i-1], &inpfile[i])) {
143			if (i) /* process previous incidence */
144	greg	2.2	make_rbfrep();
145			#ifdef DEBUG
146	greg	2.22	fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
147	greg	2.2	inpfile[i].theta, inpfile[i].phi);
148			#endif
149	greg	2.28	if (inpfile[i].nspec)
150			set_spectral_samples(inpfile[i].nspec);
151	greg	2.2	new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
152			}
153	greg	2.3	#ifdef DEBUG
154			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
155			#endif
156	greg	2.2	/* read scattering data */
157	greg	2.28	while (fscanf(fp, "%lf %lf %lf", &theta_out, &phi_out, val) == 3) {
158			for (n = 1; n < inpfile[i].nspec; n++)
159			if (fscanf(fp, "%lf", val+n) != 1) {
160			fprintf(stderr, "%s: warning: unexpected EOF\n",
161			inpfile[i].fname);
162			fclose(fp);
163			return(1);
164			}
165	greg	2.27	add_bsdf_data(theta_out, phi_out+90.-inpfile[i].up_phi,
166			val, inpfile[i].isDSF);
167	greg	2.28	}
168	greg	2.1	n = 0;
169			while ((c = getc(fp)) != EOF)
170			n += !isspace(c);
171			if (n)
172			fprintf(stderr,
173			"%s: warning: %d unexpected characters past EOD\n",
174	greg	2.2	inpfile[i].fname, n);
175	greg	2.1	fclose(fp);
176			return(1);
177			}
178
179	greg	2.8	#ifndef TEST_MAIN
180	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
181			int
182			main(int argc, char *argv[])
183			{
184			extern int nprocs;
185			int i;
186			/* start header */
187			SET_FILE_BINARY(stdout);
188			newheader("RADIANCE", stdout);
189			printargs(argc, argv, stdout);
190			fputnow(stdout);
191			progname = argv[0]; /* get options */
192			while (argc > 2 && argv[1][0] == '-') {
193			switch (argv[1][1]) {
194			case 'n':
195			nprocs = atoi(argv[2]);
196			break;
197			default:
198			goto userr;
199			}
200			argv += 2; argc -= 2;
201			}
202	greg	2.2	/* initialize & sort inputs */
203			ninpfiles = argc - 1;
204			if (ninpfiles < 2)
205	greg	2.1	goto userr;
206	greg	2.2	inpfile = (PGINPUT )malloc(sizeof(PGINPUT)ninpfiles);
207			if (inpfile == NULL)
208			return(1);
209			for (i = 0; i < ninpfiles; i++)
210			if (!init_pabopto_inp(i, argv[i+1]))
211	greg	2.1	return(1);
212	greg	2.25	qsort(inpfile, ninpfiles, sizeof(PGINPUT), cmp_indir);
213	greg	2.2	/* compile measurements */
214			for (i = 0; i < ninpfiles; i++)
215			if (!add_pabopto_inp(i))
216			return(1);
217			make_rbfrep(); /* process last data set */
218	greg	2.1	build_mesh(); /* create interpolation */
219			save_bsdf_rep(stdout); /* write it out */
220			return(0);
221			userr:
222			fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
223			progname);
224			return(1);
225			}
226	greg	2.6	#else
227			/* Test main produces a Radiance model from the given input file */
228			int
229			main(int argc, char *argv[])
230			{
231			PGINPUT pginp;
232			char buf[128];
233			FILE *pfp;
234			double bsdf, min_log;
235			FVECT dir;
236			int i, j, n;
237
238	greg	2.21	progname = argv[0];
239	greg	2.6	if (argc != 2) {
240	greg	2.21	fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname);
241	greg	2.6	return(1);
242			}
243			ninpfiles = 1;
244			inpfile = &pginp;
245			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
246			return(1);
247			/* reduce data set */
248	greg	2.21	if (make_rbfrep() == NULL) {
249			fprintf(stderr, "%s: nothing to plot!\n", progname);
250			exit(1);
251			}
252	greg	2.9	#ifdef DEBUG
253			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
254			#endif
255	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
256	greg	2.11	#if 1 /* produce spheres at meas. */
257	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
258			n = 0;
259	greg	2.28	for (i = 0; i < grid_res; i++)
260			for (j = 0; j < grid_res; j++)
261	greg	2.16	if (dsf_grid[i][j].sum.n > 0) {
262	greg	2.6	ovec_from_pos(dir, i, j);
263	greg	2.16	bsdf = dsf_grid[i][j].sum.v /
264	greg	2.24	((double)dsf_grid[i][j].sum.noutput_orientdir[2]);
265	greg	2.6	if (bsdf <= bsdf_min*.6)
266			continue;
267	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
268	greg	2.7	ovec_from_pos(dir, i, j);
269			printf("yellow sphere s%04d\n0\n0\n", ++n);
270			printf("4 %.6g %.6g %.6g %.6g\n\n",
271	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
272	greg	2.7	.007*bsdf);
273	greg	2.6	}
274	greg	2.11	#endif
275			#if 1 /* spheres at RBF peaks */
276			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
277			for (n = 0; n < dsf_list->nrbf; n++) {
278			RBFVAL *rbf = &dsf_list->rbfa[n];
279			ovec_from_pos(dir, rbf->gx, rbf->gy);
280	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
281	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
282	greg	2.11	printf("red sphere p%04d\n0\n0\n", ++n);
283			printf("4 %.6g %.6g %.6g %.6g\n\n",
284			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
285			.011*bsdf);
286			}
287			#endif
288			#if 1 /* output continuous surface */
289	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
290			fflush(stdout);
291	greg	2.28	sprintf(buf, "gensurf tgreen bsdf - - - %d %d", grid_res-1, grid_res-1);
292	greg	2.6	pfp = popen(buf, "w");
293			if (pfp == NULL) {
294	greg	2.21	fprintf(stderr, "%s: cannot open '\| %s'\n", progname, buf);
295	greg	2.6	return(1);
296			}
297	greg	2.28	for (i = 0; i < grid_res; i++)
298			for (j = 0; j < grid_res; j++) {
299	greg	2.6	ovec_from_pos(dir, i, j);
300	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
301	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
302	greg	2.6	fprintf(pfp, "%.8e %.8e %.8e\n",
303			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
304			}
305	greg	2.11	if (pclose(pfp) != 0)
306			return(1);
307			#endif
308			return(0);
309	greg	2.6	}
310			#endif