src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.18 2014/03/19 00:19:11 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"
#include "resolu.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;

double          angle_eps = 0;  /* epsilon for angle comparisons */

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+angle_eps)
                return(1);
        if (inp1->theta < inp2->theta-angle_eps)
                return(-1);
        if (inp1->phi > inp2->phi+angle_eps)
                return(1);
        if (inp1->phi < inp2->phi-angle_eps)
                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)
{
        static int      lastnew = -1;
        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 */
        angle_eps = 180./2./GRIDRES;
        if (lastnew < 0 || cmp_inang(&inpfile[lastnew], &inpfile[i])) {
                if (lastnew >= 0)       /* 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);
                lastnew = i;
        }
#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);
        angle_eps = 0;
        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].sum.n > 0) {
                        ovec_from_pos(dir, i, j);
                        bsdf = dsf_grid[i][j].sum.v /
                                (dsf_grid[i][j].sum.n*output_orient*dir[2]);
                        if (bsdf <= bsdf_min*.6)
                                continue;
                        bsdf = log(bsdf + 1e-5) - min_log;
                        ovec_from_pos(dir, i, j);
                        printf("yellow sphere s%04d\n0\n0\n", ++n);
                        printf("4 %.6g %.6g %.6g %.6g\n\n",
                                        dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf,
                                        .007*bsdf);
                }
#endif
#if 1                                           /* spheres at RBF peaks */
        puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
        for (n = 0; n < dsf_list->nrbf; n++) {
                RBFVAL  *rbf = &dsf_list->rbfa[n];
                ovec_from_pos(dir, rbf->gx, rbf->gy);
                bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]);
                bsdf = log(bsdf + 1e-5) - min_log;
                printf("red sphere p%04d\n0\n0\n", ++n);
                printf("4 %.6g %.6g %.6g %.6g\n\n",
                                dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf,
                                .011*bsdf);
        }
#endif
#if 1                                           /* output continuous surface */
        puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
        fflush(stdout);
        sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1);
        pfp = popen(buf, "w");
        if (pfp == NULL) {
                fprintf(stderr, "%s: cannot open '| %s'\n", 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 + 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:	2.19
Committed:	Wed Mar 19 19:48:57 2014 UTC (10 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.18:	+8 -6 lines
Log Message:	Fixed potential bug due with closely-spaced incident angles
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.19	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.18 2014/03/19 00:19:11 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	greg	2.15	#include "resolu.h"
18	greg	2.1	/* global argv[0] */
19			char *progname;
20
21	greg	2.2	typedef struct {
22			const char fname; / input file path */
23			double theta, phi; /* incident angles (in degrees) */
24			int isDSF; /* data is DSF (rather than BSDF)? */
25			long dstart; /* data start offset in file */
26			} PGINPUT;
27
28	greg	2.18	double angle_eps = 0; /* epsilon for angle comparisons */
29	greg	2.17
30	greg	2.2	PGINPUT inpfile; / input files sorted by incidence */
31			int ninpfiles; /* number of input files */
32
33			/* Compare incident angles */
34			static int
35			cmp_inang(const void p1, const void p2)
36			{
37			const PGINPUT inp1 = (const PGINPUT )p1;
38			const PGINPUT inp2 = (const PGINPUT )p2;
39
40	greg	2.18	if (inp1->theta > inp2->theta+angle_eps)
41	greg	2.2	return(1);
42	greg	2.18	if (inp1->theta < inp2->theta-angle_eps)
43	greg	2.2	return(-1);
44	greg	2.18	if (inp1->phi > inp2->phi+angle_eps)
45	greg	2.2	return(1);
46	greg	2.18	if (inp1->phi < inp2->phi-angle_eps)
47	greg	2.2	return(-1);
48			return(0);
49			}
50
51			/* Prepare a PAB-Opto input file by reading its header */
52	greg	2.1	static int
53	greg	2.2	init_pabopto_inp(const int i, const char *fname)
54	greg	2.1	{
55			FILE *fp = fopen(fname, "r");
56			char buf[2048];
57	greg	2.2	int c;
58	greg	2.1
59			if (fp == NULL) {
60			fputs(fname, stderr);
61			fputs(": cannot open\n", stderr);
62			return(0);
63			}
64	greg	2.2	inpfile[i].fname = fname;
65			inpfile[i].isDSF = -1;
66			inpfile[i].theta = inpfile[i].phi = -10001.;
67	greg	2.1	/* read header information */
68			while ((c = getc(fp)) == '#' \|\| c == EOF) {
69	greg	2.5	char typ[32];
70	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
71			fputs(fname, stderr);
72			fputs(": unexpected EOF\n", stderr);
73			fclose(fp);
74			return(0);
75			}
76	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
77			continue;
78	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
79			if (!strcasecmp(typ, "DSF")) {
80			inpfile[i].isDSF = 1;
81			continue;
82			}
83			if (!strcasecmp(typ, "BSDF")) {
84			inpfile[i].isDSF = 0;
85			continue;
86			}
87	greg	2.1	}
88	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
89	greg	2.1	continue;
90	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
91	greg	2.1	continue;
92			if (sscanf(buf, "incident_angle %lf %lf",
93	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
94	greg	2.1	continue;
95			}
96	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
97			fclose(fp);
98			if (inpfile[i].isDSF < 0) {
99	greg	2.1	fputs(fname, stderr);
100			fputs(": unknown format\n", stderr);
101			return(0);
102			}
103	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
104			fputs(fname, stderr);
105			fputs(": unknown incident angle\n", stderr);
106			return(0);
107			}
108	greg	2.4	while (inpfile[i].phi < 0) /* normalize phi direction */
109			inpfile[i].phi += 360.;
110	greg	2.2	return(1);
111			}
112
113			/* Load a set of measurements corresponding to a particular incident angle */
114			static int
115			add_pabopto_inp(const int i)
116			{
117	greg	2.19	static int lastnew = -1;
118			FILE *fp = fopen(inpfile[i].fname, "r");
119			double theta_out, phi_out, val;
120			int n, c;
121	greg	2.2
122			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
123			fputs(inpfile[i].fname, stderr);
124			fputs(": cannot open\n", stderr);
125			return(0);
126			}
127	greg	2.1	/* prepare input grid */
128	greg	2.18	angle_eps = 180./2./GRIDRES;
129	greg	2.19	if (lastnew < 0 \|\| cmp_inang(&inpfile[lastnew], &inpfile[i])) {
130			if (lastnew >= 0) /* need to process previous incidence */
131	greg	2.2	make_rbfrep();
132			#ifdef DEBUG
133			fprintf(stderr, "New incident (theta,phi)=(%f,%f)\n",
134			inpfile[i].theta, inpfile[i].phi);
135			#endif
136			new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
137	greg	2.19	lastnew = i;
138	greg	2.2	}
139	greg	2.3	#ifdef DEBUG
140			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
141			#endif
142	greg	2.2	/* read scattering data */
143	greg	2.1	while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3)
144	greg	2.2	add_bsdf_data(theta_out, phi_out, val, inpfile[i].isDSF);
145	greg	2.1	n = 0;
146			while ((c = getc(fp)) != EOF)
147			n += !isspace(c);
148			if (n)
149			fprintf(stderr,
150			"%s: warning: %d unexpected characters past EOD\n",
151	greg	2.2	inpfile[i].fname, n);
152	greg	2.1	fclose(fp);
153			return(1);
154			}
155
156	greg	2.8	#ifndef TEST_MAIN
157	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
158			int
159			main(int argc, char *argv[])
160			{
161			extern int nprocs;
162			int i;
163			/* start header */
164			SET_FILE_BINARY(stdout);
165			newheader("RADIANCE", stdout);
166			printargs(argc, argv, stdout);
167			fputnow(stdout);
168			progname = argv[0]; /* get options */
169			while (argc > 2 && argv[1][0] == '-') {
170			switch (argv[1][1]) {
171			case 'n':
172			nprocs = atoi(argv[2]);
173			break;
174			default:
175			goto userr;
176			}
177			argv += 2; argc -= 2;
178			}
179	greg	2.2	/* initialize & sort inputs */
180			ninpfiles = argc - 1;
181			if (ninpfiles < 2)
182	greg	2.1	goto userr;
183	greg	2.2	inpfile = (PGINPUT )malloc(sizeof(PGINPUT)ninpfiles);
184			if (inpfile == NULL)
185			return(1);
186			for (i = 0; i < ninpfiles; i++)
187			if (!init_pabopto_inp(i, argv[i+1]))
188	greg	2.1	return(1);
189	greg	2.18	angle_eps = 0;
190	greg	2.2	qsort(inpfile, ninpfiles, sizeof(PGINPUT), &cmp_inang);
191			/* compile measurements */
192			for (i = 0; i < ninpfiles; i++)
193			if (!add_pabopto_inp(i))
194			return(1);
195			make_rbfrep(); /* process last data set */
196	greg	2.1	build_mesh(); /* create interpolation */
197			save_bsdf_rep(stdout); /* write it out */
198			return(0);
199			userr:
200			fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
201			progname);
202			return(1);
203			}
204	greg	2.6	#else
205			/* Test main produces a Radiance model from the given input file */
206			int
207			main(int argc, char *argv[])
208			{
209			PGINPUT pginp;
210			char buf[128];
211			FILE *pfp;
212			double bsdf, min_log;
213			FVECT dir;
214			int i, j, n;
215
216			if (argc != 2) {
217			fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]);
218			return(1);
219			}
220			ninpfiles = 1;
221			inpfile = &pginp;
222			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
223			return(1);
224			/* reduce data set */
225			make_rbfrep();
226	greg	2.9	#ifdef DEBUG
227			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
228			#endif
229	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
230	greg	2.11	#if 1 /* produce spheres at meas. */
231	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
232			n = 0;
233			for (i = 0; i < GRIDRES; i++)
234			for (j = 0; j < GRIDRES; j++)
235	greg	2.16	if (dsf_grid[i][j].sum.n > 0) {
236	greg	2.6	ovec_from_pos(dir, i, j);
237	greg	2.16	bsdf = dsf_grid[i][j].sum.v /
238			(dsf_grid[i][j].sum.noutput_orientdir[2]);
239	greg	2.6	if (bsdf <= bsdf_min*.6)
240			continue;
241	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
242	greg	2.7	ovec_from_pos(dir, i, j);
243			printf("yellow sphere s%04d\n0\n0\n", ++n);
244			printf("4 %.6g %.6g %.6g %.6g\n\n",
245	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
246	greg	2.7	.007*bsdf);
247	greg	2.6	}
248	greg	2.11	#endif
249			#if 1 /* spheres at RBF peaks */
250			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
251			for (n = 0; n < dsf_list->nrbf; n++) {
252			RBFVAL *rbf = &dsf_list->rbfa[n];
253			ovec_from_pos(dir, rbf->gx, rbf->gy);
254			bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]);
255	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
256	greg	2.11	printf("red sphere p%04d\n0\n0\n", ++n);
257			printf("4 %.6g %.6g %.6g %.6g\n\n",
258			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
259			.011*bsdf);
260			}
261			#endif
262			#if 1 /* output continuous surface */
263	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
264			fflush(stdout);
265			sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1);
266			pfp = popen(buf, "w");
267			if (pfp == NULL) {
268	greg	2.8	fprintf(stderr, "%s: cannot open '\| %s'\n", argv[0], buf);
269	greg	2.6	return(1);
270			}
271			for (i = 0; i < GRIDRES; i++)
272			for (j = 0; j < GRIDRES; j++) {
273			ovec_from_pos(dir, i, j);
274	greg	2.8	bsdf = eval_rbfrep(dsf_list, dir) / (output_orient*dir[2]);
275	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
276	greg	2.6	fprintf(pfp, "%.8e %.8e %.8e\n",
277			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
278			}
279	greg	2.11	if (pclose(pfp) != 0)
280			return(1);
281			#endif
282			return(0);
283	greg	2.6	}
284			#endif