src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.12 2014/01/31 00:47:10 greg Exp $";
#endif
/*
 * Load measured BSDF data in PAB-Opto format.
 *
 *      G. Ward
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "platform.h"
#include "bsdfrep.h"
                                /* global argv[0] */
char                    *progname;

typedef struct {
        const char      *fname;         /* input file path */
        double          theta, phi;     /* incident angles (in degrees) */
        int             isDSF;          /* data is DSF (rather than BSDF)? */
        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_inang(const void *p1, const void *p2)
{
        const PGINPUT   *inp1 = (const PGINPUT *)p1;
        const PGINPUT   *inp2 = (const PGINPUT *)p2;
        
        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);
}

/* 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].theta = inpfile[i].phi = -10001.;
                                /* read header information */
        while ((c = getc(fp)) == '#' || c == EOF) {
                char    typ[32];
                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, "format: theta phi %s", typ) == 1) {
                        if (!strcasecmp(typ, "DSF")) {
                                inpfile[i].isDSF = 1;
                                continue;
                        }
                        if (!strcasecmp(typ, "BSDF")) {
                                inpfile[i].isDSF = 0;
                                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);
        }
        while (inpfile[i].phi < 0)      /* normalize phi direction */
                inpfile[i].phi += 360.;
        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;
        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_inang(&inpfile[i-1], &inpfile[i])) {
                if (i)                  /* need to process previous incidence */
                        make_rbfrep();
#ifdef DEBUG
                fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n",
                                        inpfile[i].theta, inpfile[i].phi);
#endif
                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\n", &theta_out, &phi_out, &val) == 3)
                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
/* 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_inang);
                                                /* 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;

        if (argc != 2) {
                fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]);
                return(1);
        }
        ninpfiles = 1;
        inpfile = &pginp;
        if (!init_pabopto_inp(0, argv[1]) || !add_pabopto_inp(0))
                return(1);
                                                /* reduce data set */
        make_rbfrep();
#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].nval > 0) {
                        ovec_from_pos(dir, i, j);
                        bsdf = dsf_grid[i][j].vsum /
                                (dsf_grid[i][j].nval*output_orient*dir[2]);
                        if (bsdf <= bsdf_min*.6)
                                continue;
                        bsdf = log(bsdf) - 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) - 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", argv[0], 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) - 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:	2.13
Committed:	Mon Feb 17 21:56:22 2014 UTC (10 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.12:	+2 -2 lines
Log Message:	Fixed problem with zero min_bsdf value
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.13	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.12 2014/01/31 00:47:10 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Load measured BSDF data in PAB-Opto format.
6			*
7			* G. Ward
8			*/
9
10			#include <stdio.h>
11	greg	2.2	#include <stdlib.h>
12	greg	2.1	#include <string.h>
13			#include <ctype.h>
14	greg	2.6	#include <math.h>
15	greg	2.1	#include "platform.h"
16			#include "bsdfrep.h"
17			/* global argv[0] */
18			char *progname;
19
20	greg	2.2	typedef struct {
21			const char fname; / input file path */
22			double theta, phi; /* incident angles (in degrees) */
23			int isDSF; /* data is DSF (rather than BSDF)? */
24			long dstart; /* data start offset in file */
25			} PGINPUT;
26
27			PGINPUT inpfile; / input files sorted by incidence */
28			int ninpfiles; /* number of input files */
29
30			/* Compare incident angles */
31			static int
32			cmp_inang(const void p1, const void p2)
33			{
34			const PGINPUT inp1 = (const PGINPUT )p1;
35			const PGINPUT inp2 = (const PGINPUT )p2;
36
37			if (inp1->theta > inp2->theta+FTINY)
38			return(1);
39			if (inp1->theta < inp2->theta-FTINY)
40			return(-1);
41			if (inp1->phi > inp2->phi+FTINY)
42			return(1);
43			if (inp1->phi < inp2->phi-FTINY)
44			return(-1);
45			return(0);
46			}
47
48			/* Prepare a PAB-Opto input file by reading its header */
49	greg	2.1	static int
50	greg	2.2	init_pabopto_inp(const int i, const char *fname)
51	greg	2.1	{
52			FILE *fp = fopen(fname, "r");
53			char buf[2048];
54	greg	2.2	int c;
55	greg	2.1
56			if (fp == NULL) {
57			fputs(fname, stderr);
58			fputs(": cannot open\n", stderr);
59			return(0);
60			}
61	greg	2.2	inpfile[i].fname = fname;
62			inpfile[i].isDSF = -1;
63			inpfile[i].theta = inpfile[i].phi = -10001.;
64	greg	2.1	/* read header information */
65			while ((c = getc(fp)) == '#' \|\| c == EOF) {
66	greg	2.5	char typ[32];
67	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
68			fputs(fname, stderr);
69			fputs(": unexpected EOF\n", stderr);
70			fclose(fp);
71			return(0);
72			}
73	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
74			continue;
75	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
76			if (!strcasecmp(typ, "DSF")) {
77			inpfile[i].isDSF = 1;
78			continue;
79			}
80			if (!strcasecmp(typ, "BSDF")) {
81			inpfile[i].isDSF = 0;
82			continue;
83			}
84	greg	2.1	}
85	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
86	greg	2.1	continue;
87	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
88	greg	2.1	continue;
89			if (sscanf(buf, "incident_angle %lf %lf",
90	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
91	greg	2.1	continue;
92			}
93	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
94			fclose(fp);
95			if (inpfile[i].isDSF < 0) {
96	greg	2.1	fputs(fname, stderr);
97			fputs(": unknown format\n", stderr);
98			return(0);
99			}
100	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
101			fputs(fname, stderr);
102			fputs(": unknown incident angle\n", stderr);
103			return(0);
104			}
105	greg	2.4	while (inpfile[i].phi < 0) /* normalize phi direction */
106			inpfile[i].phi += 360.;
107	greg	2.2	return(1);
108			}
109
110			/* Load a set of measurements corresponding to a particular incident angle */
111			static int
112			add_pabopto_inp(const int i)
113			{
114			FILE *fp = fopen(inpfile[i].fname, "r");
115			double theta_out, phi_out, val;
116			int n, c;
117
118			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
119			fputs(inpfile[i].fname, stderr);
120			fputs(": cannot open\n", stderr);
121			return(0);
122			}
123	greg	2.1	/* prepare input grid */
124	greg	2.2	if (!i \|\| cmp_inang(&inpfile[i-1], &inpfile[i])) {
125			if (i) /* need to process previous incidence */
126			make_rbfrep();
127			#ifdef DEBUG
128			fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n",
129			inpfile[i].theta, inpfile[i].phi);
130			#endif
131			new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
132			}
133	greg	2.3	#ifdef DEBUG
134			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
135			#endif
136	greg	2.2	/* read scattering data */
137	greg	2.1	while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3)
138	greg	2.2	add_bsdf_data(theta_out, phi_out, val, inpfile[i].isDSF);
139	greg	2.1	n = 0;
140			while ((c = getc(fp)) != EOF)
141			n += !isspace(c);
142			if (n)
143			fprintf(stderr,
144			"%s: warning: %d unexpected characters past EOD\n",
145	greg	2.2	inpfile[i].fname, n);
146	greg	2.1	fclose(fp);
147			return(1);
148			}
149
150	greg	2.8	#ifndef TEST_MAIN
151	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
152			int
153			main(int argc, char *argv[])
154			{
155			extern int nprocs;
156			int i;
157			/* start header */
158			SET_FILE_BINARY(stdout);
159			newheader("RADIANCE", stdout);
160			printargs(argc, argv, stdout);
161			fputnow(stdout);
162			progname = argv[0]; /* get options */
163			while (argc > 2 && argv[1][0] == '-') {
164			switch (argv[1][1]) {
165			case 'n':
166			nprocs = atoi(argv[2]);
167			break;
168			default:
169			goto userr;
170			}
171			argv += 2; argc -= 2;
172			}
173	greg	2.2	/* initialize & sort inputs */
174			ninpfiles = argc - 1;
175			if (ninpfiles < 2)
176	greg	2.1	goto userr;
177	greg	2.2	inpfile = (PGINPUT )malloc(sizeof(PGINPUT)ninpfiles);
178			if (inpfile == NULL)
179			return(1);
180			for (i = 0; i < ninpfiles; i++)
181			if (!init_pabopto_inp(i, argv[i+1]))
182	greg	2.1	return(1);
183	greg	2.2	qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_inang);
184			/* compile measurements */
185			for (i = 0; i < ninpfiles; i++)
186			if (!add_pabopto_inp(i))
187			return(1);
188			make_rbfrep(); /* process last data set */
189	greg	2.1	build_mesh(); /* create interpolation */
190			save_bsdf_rep(stdout); /* write it out */
191			return(0);
192			userr:
193			fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
194			progname);
195			return(1);
196			}
197	greg	2.6	#else
198			/* Test main produces a Radiance model from the given input file */
199			int
200			main(int argc, char *argv[])
201			{
202			PGINPUT pginp;
203			char buf[128];
204			FILE *pfp;
205			double bsdf, min_log;
206			FVECT dir;
207			int i, j, n;
208
209			if (argc != 2) {
210			fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]);
211			return(1);
212			}
213			ninpfiles = 1;
214			inpfile = &pginp;
215			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
216			return(1);
217			/* reduce data set */
218			make_rbfrep();
219	greg	2.9	#ifdef DEBUG
220			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
221			#endif
222	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
223	greg	2.11	#if 1 /* produce spheres at meas. */
224	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
225			n = 0;
226			for (i = 0; i < GRIDRES; i++)
227			for (j = 0; j < GRIDRES; j++)
228	greg	2.7	if (dsf_grid[i][j].nval > 0) {
229	greg	2.6	ovec_from_pos(dir, i, j);
230	greg	2.8	bsdf = dsf_grid[i][j].vsum /
231			(dsf_grid[i][j].nvaloutput_orientdir[2]);
232	greg	2.6	if (bsdf <= bsdf_min*.6)
233			continue;
234			bsdf = log(bsdf) - min_log;
235	greg	2.7	ovec_from_pos(dir, i, j);
236			printf("yellow sphere s%04d\n0\n0\n", ++n);
237			printf("4 %.6g %.6g %.6g %.6g\n\n",
238	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
239	greg	2.7	.007*bsdf);
240	greg	2.6	}
241	greg	2.11	#endif
242			#if 1 /* spheres at RBF peaks */
243			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
244			for (n = 0; n < dsf_list->nrbf; n++) {
245			RBFVAL *rbf = &dsf_list->rbfa[n];
246			ovec_from_pos(dir, rbf->gx, rbf->gy);
247			bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]);
248			bsdf = log(bsdf) - min_log;
249			printf("red sphere p%04d\n0\n0\n", ++n);
250			printf("4 %.6g %.6g %.6g %.6g\n\n",
251			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
252			.011*bsdf);
253			}
254			#endif
255			#if 1 /* output continuous surface */
256	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
257			fflush(stdout);
258			sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1);
259			pfp = popen(buf, "w");
260			if (pfp == NULL) {
261	greg	2.8	fprintf(stderr, "%s: cannot open '\| %s'\n", argv[0], buf);
262	greg	2.6	return(1);
263			}
264			for (i = 0; i < GRIDRES; i++)
265			for (j = 0; j < GRIDRES; j++) {
266			ovec_from_pos(dir, i, j);
267	greg	2.8	bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]);
268	greg	2.6	bsdf = log(bsdf) - min_log;
269			fprintf(pfp, "%.8e %.8e %.8e\n",
270			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
271			}
272	greg	2.11	if (pclose(pfp) != 0)
273			return(1);
274			#endif
275			return(0);
276	greg	2.6	}
277			#endif