src/cv/pabopto2bsdf.c

#ifndef lint
static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.26 2014/08/21 10:33:48 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)? */
        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].up_phi = 0;
        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") ||
                                        !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;
        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
                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+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 < 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 /
                           ((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", GRIDRES-1, GRIDRES-1);
        pfp = popen(buf, "w");
        if (pfp == NULL) {
                fprintf(stderr, "%s: cannot open '| %s'\n", progname, 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);
                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:	2.27
Committed:	Fri Oct 3 21:57:06 2014 UTC (9 years, 7 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad4R2P2, rad5R0
Changes since 2.26:	+10 -3 lines
Log Message:	Added default 90-degree rotation to align PAB's up vector to BSDF standard
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.27	static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.26 2014/08/21 10:33:48 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			long dstart; /* data start offset in file */
29			} PGINPUT;
30
31			PGINPUT inpfile; / input files sorted by incidence */
32			int ninpfiles; /* number of input files */
33
34			/* 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			/* 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	greg	2.20	FVECT dv;
54	greg	2.1	char buf[2048];
55	greg	2.2	int c;
56	greg	2.1
57			if (fp == NULL) {
58			fputs(fname, stderr);
59			fputs(": cannot open\n", stderr);
60			return(0);
61			}
62	greg	2.2	inpfile[i].fname = fname;
63			inpfile[i].isDSF = -1;
64	greg	2.27	inpfile[i].up_phi = 0;
65	greg	2.2	inpfile[i].theta = inpfile[i].phi = -10001.;
66	greg	2.1	/* read header information */
67			while ((c = getc(fp)) == '#' \|\| c == EOF) {
68	greg	2.5	char typ[32];
69	greg	2.1	if (fgets(buf, sizeof(buf), fp) == NULL) {
70			fputs(fname, stderr);
71			fputs(": unexpected EOF\n", stderr);
72			fclose(fp);
73			return(0);
74			}
75	greg	2.10	if (sscanf(buf, "sample_name \"%[^\"]\"", bsdf_name) == 1)
76			continue;
77	greg	2.5	if (sscanf(buf, "format: theta phi %s", typ) == 1) {
78			if (!strcasecmp(typ, "DSF")) {
79			inpfile[i].isDSF = 1;
80			continue;
81			}
82	greg	2.23	if (!strcasecmp(typ, "BSDF") \|\|
83			!strcasecmp(typ, "BRDF") \|\|
84			!strcasecmp(typ, "BTDF")) {
85	greg	2.5	inpfile[i].isDSF = 0;
86			continue;
87			}
88	greg	2.1	}
89	greg	2.27	if (sscanf(buf, "upphi %lf", &inpfile[i].up_phi) == 1)
90			continue;
91	greg	2.2	if (sscanf(buf, "intheta %lf", &inpfile[i].theta) == 1)
92	greg	2.1	continue;
93	greg	2.2	if (sscanf(buf, "inphi %lf", &inpfile[i].phi) == 1)
94	greg	2.1	continue;
95			if (sscanf(buf, "incident_angle %lf %lf",
96	greg	2.2	&inpfile[i].theta, &inpfile[i].phi) == 2)
97	greg	2.1	continue;
98			}
99	greg	2.2	inpfile[i].dstart = ftell(fp) - 1;
100			fclose(fp);
101			if (inpfile[i].isDSF < 0) {
102	greg	2.1	fputs(fname, stderr);
103			fputs(": unknown format\n", stderr);
104			return(0);
105			}
106	greg	2.2	if ((inpfile[i].theta < -10000.) \| (inpfile[i].phi < -10000.)) {
107			fputs(fname, stderr);
108			fputs(": unknown incident angle\n", stderr);
109			return(0);
110			}
111	greg	2.27	/* convert to Y-up orientation */
112			inpfile[i].phi += 90.-inpfile[i].up_phi;
113	greg	2.20	/* convert angle to grid position */
114			dv[2] = sin(M_PI/180.*inpfile[i].theta);
115			dv[0] = cos(M_PI/180.inpfile[i].phi)dv[2];
116			dv[1] = sin(M_PI/180.inpfile[i].phi)dv[2];
117			dv[2] = sqrt(1. - dv[2]*dv[2]);
118			pos_from_vec(inpfile[i].igp, dv);
119	greg	2.2	return(1);
120			}
121
122			/* Load a set of measurements corresponding to a particular incident angle */
123			static int
124			add_pabopto_inp(const int i)
125			{
126	greg	2.19	FILE *fp = fopen(inpfile[i].fname, "r");
127			double theta_out, phi_out, val;
128			int n, c;
129	greg	2.2
130			if (fp == NULL \|\| fseek(fp, inpfile[i].dstart, 0) == EOF) {
131			fputs(inpfile[i].fname, stderr);
132			fputs(": cannot open\n", stderr);
133			return(0);
134			}
135	greg	2.1	/* prepare input grid */
136	greg	2.20	if (!i \|\| cmp_indir(&inpfile[i-1], &inpfile[i])) {
137			if (i) /* process previous incidence */
138	greg	2.2	make_rbfrep();
139			#ifdef DEBUG
140	greg	2.22	fprintf(stderr, "New incident (theta,phi)=(%.1f,%.1f)\n",
141	greg	2.2	inpfile[i].theta, inpfile[i].phi);
142			#endif
143			new_bsdf_data(inpfile[i].theta, inpfile[i].phi);
144			}
145	greg	2.3	#ifdef DEBUG
146			fprintf(stderr, "Loading measurements from '%s'...\n", inpfile[i].fname);
147			#endif
148	greg	2.2	/* read scattering data */
149	greg	2.1	while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3)
150	greg	2.27	add_bsdf_data(theta_out, phi_out+90.-inpfile[i].up_phi,
151			val, inpfile[i].isDSF);
152	greg	2.1	n = 0;
153			while ((c = getc(fp)) != EOF)
154			n += !isspace(c);
155			if (n)
156			fprintf(stderr,
157			"%s: warning: %d unexpected characters past EOD\n",
158	greg	2.2	inpfile[i].fname, n);
159	greg	2.1	fclose(fp);
160			return(1);
161			}
162
163	greg	2.8	#ifndef TEST_MAIN
164	greg	2.1	/* Read in PAB-Opto BSDF files and output RBF interpolant */
165			int
166			main(int argc, char *argv[])
167			{
168			extern int nprocs;
169			int i;
170			/* start header */
171			SET_FILE_BINARY(stdout);
172			newheader("RADIANCE", stdout);
173			printargs(argc, argv, stdout);
174			fputnow(stdout);
175			progname = argv[0]; /* get options */
176			while (argc > 2 && argv[1][0] == '-') {
177			switch (argv[1][1]) {
178			case 'n':
179			nprocs = atoi(argv[2]);
180			break;
181			default:
182			goto userr;
183			}
184			argv += 2; argc -= 2;
185			}
186	greg	2.2	/* initialize & sort inputs */
187			ninpfiles = argc - 1;
188			if (ninpfiles < 2)
189	greg	2.1	goto userr;
190	greg	2.2	inpfile = (PGINPUT )malloc(sizeof(PGINPUT)ninpfiles);
191			if (inpfile == NULL)
192			return(1);
193			for (i = 0; i < ninpfiles; i++)
194			if (!init_pabopto_inp(i, argv[i+1]))
195	greg	2.1	return(1);
196	greg	2.25	qsort(inpfile, ninpfiles, sizeof(PGINPUT), cmp_indir);
197	greg	2.2	/* compile measurements */
198			for (i = 0; i < ninpfiles; i++)
199			if (!add_pabopto_inp(i))
200			return(1);
201			make_rbfrep(); /* process last data set */
202	greg	2.1	build_mesh(); /* create interpolation */
203			save_bsdf_rep(stdout); /* write it out */
204			return(0);
205			userr:
206			fprintf(stderr, "Usage: %s [-n nproc] meas1.dat meas2.dat .. > bsdf.sir\n",
207			progname);
208			return(1);
209			}
210	greg	2.6	#else
211			/* Test main produces a Radiance model from the given input file */
212			int
213			main(int argc, char *argv[])
214			{
215			PGINPUT pginp;
216			char buf[128];
217			FILE *pfp;
218			double bsdf, min_log;
219			FVECT dir;
220			int i, j, n;
221
222	greg	2.21	progname = argv[0];
223	greg	2.6	if (argc != 2) {
224	greg	2.21	fprintf(stderr, "Usage: %s input.dat > output.rad\n", progname);
225	greg	2.6	return(1);
226			}
227			ninpfiles = 1;
228			inpfile = &pginp;
229			if (!init_pabopto_inp(0, argv[1]) \|\| !add_pabopto_inp(0))
230			return(1);
231			/* reduce data set */
232	greg	2.21	if (make_rbfrep() == NULL) {
233			fprintf(stderr, "%s: nothing to plot!\n", progname);
234			exit(1);
235			}
236	greg	2.9	#ifdef DEBUG
237			fprintf(stderr, "Minimum BSDF = %.4f\n", bsdf_min);
238			#endif
239	greg	2.13	min_log = log(bsdf_min*.5 + 1e-5);
240	greg	2.11	#if 1 /* produce spheres at meas. */
241	greg	2.6	puts("void plastic yellow\n0\n0\n5 .6 .4 .01 .04 .08\n");
242			n = 0;
243			for (i = 0; i < GRIDRES; i++)
244			for (j = 0; j < GRIDRES; j++)
245	greg	2.16	if (dsf_grid[i][j].sum.n > 0) {
246	greg	2.6	ovec_from_pos(dir, i, j);
247	greg	2.16	bsdf = dsf_grid[i][j].sum.v /
248	greg	2.24	((double)dsf_grid[i][j].sum.noutput_orientdir[2]);
249	greg	2.6	if (bsdf <= bsdf_min*.6)
250			continue;
251	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
252	greg	2.7	ovec_from_pos(dir, i, j);
253			printf("yellow sphere s%04d\n0\n0\n", ++n);
254			printf("4 %.6g %.6g %.6g %.6g\n\n",
255	greg	2.6	dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
256	greg	2.7	.007*bsdf);
257	greg	2.6	}
258	greg	2.11	#endif
259			#if 1 /* spheres at RBF peaks */
260			puts("void plastic red\n0\n0\n5 .8 .01 .01 .04 .08\n");
261			for (n = 0; n < dsf_list->nrbf; n++) {
262			RBFVAL *rbf = &dsf_list->rbfa[n];
263			ovec_from_pos(dir, rbf->gx, rbf->gy);
264	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
265	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
266	greg	2.11	printf("red sphere p%04d\n0\n0\n", ++n);
267			printf("4 %.6g %.6g %.6g %.6g\n\n",
268			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf,
269			.011*bsdf);
270			}
271			#endif
272			#if 1 /* output continuous surface */
273	greg	2.6	puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 1\n");
274			fflush(stdout);
275			sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1);
276			pfp = popen(buf, "w");
277			if (pfp == NULL) {
278	greg	2.21	fprintf(stderr, "%s: cannot open '\| %s'\n", progname, buf);
279	greg	2.6	return(1);
280			}
281			for (i = 0; i < GRIDRES; i++)
282			for (j = 0; j < GRIDRES; j++) {
283			ovec_from_pos(dir, i, j);
284	greg	2.26	bsdf = eval_rbfrep(dsf_list, dir);
285	greg	2.14	bsdf = log(bsdf + 1e-5) - min_log;
286	greg	2.6	fprintf(pfp, "%.8e %.8e %.8e\n",
287			dir[0]bsdf, dir[1]bsdf, dir[2]*bsdf);
288			}
289	greg	2.11	if (pclose(pfp) != 0)
290			return(1);
291			#endif
292			return(0);
293	greg	2.6	}
294			#endif