src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.10 2012/12/12 04:49:59 greg Exp $";
#endif
/*
 * Load measured BSDF interpolant and write out as XML file with tensor tree.
 *
 *      G. Ward
 */

#define _USE_MATH_DEFINES
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "platform.h"
#include "calcomp.h"
#include "bsdfrep.h"
                                /* global argv[0] */
char                    *progname;
                                /* percentage to cull (<0 to turn off) */
double                  pctcull = 90.;
                                /* sampling order */
int                     samp_order = 6;

/* Output XML prologue to stdout */
static void
xml_prologue(int ac, char *av[])
{
        puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">");
        fputs("<!-- File produced by:", stdout);
        while (ac-- > 0) {
                fputc(' ', stdout);
                fputs(*av++, stdout);
        }
        puts(" -->");
        puts("<WindowElementType>System</WindowElementType>");
        puts("<FileType>BSDF</FileType>");
        puts("<Optical>");
        puts("<Layer>");
        puts("\t<Material>");
        puts("\t\t<Name>Name</Name>");
        puts("\t\t<Manufacturer>Manufacturer</Manufacturer>");
        puts("\t\t<DeviceType>Other</DeviceType>");
        puts("\t</Material>");
        puts("\t<DataDefinition>");
        printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
                        single_plane_incident ? '3' : '4');
        puts("\t</DataDefinition>");
}

/* Output XML data prologue to stdout */
static void
data_prologue()
{
        static const char       *bsdf_type[4] = {
                                        "Reflection Front",
                                        "Transmission Front",
                                        "Transmission Back",
                                        "Reflection Back"
                                };

        puts("\t<WavelengthData>");
        puts("\t\t<LayerNumber>System</LayerNumber>");
        puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
        puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
        puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
        puts("\t\t<WavelengthDataBlock>");
        printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
                        bsdf_type[(input_orient>0)<<1 | (output_orient>0)]);
        puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
        puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
        puts("\t\t\t<ScatteringData>");
}

/* Output XML data epilogue to stdout */
static void
data_epilogue(void)
{
        puts("\t\t\t</ScatteringData>");
        puts("\t\t</WavelengthDataBlock>");
        puts("\t</WavelengthData>");
}

/* Output XML epilogue to stdout */
static void
xml_epilogue(void)
{
        puts("</Layer>");
        puts("</Optical>");
        puts("</WindowElement>");
}

/* Interpolate and output isotropic BSDF data */
static void
eval_isotropic(char *funame)
{
        const int       sqres = 1<<samp_order;
        FILE            *ofp = NULL;
        char            cmd[128];
        int             ix, ox, oy;
        double          iovec[6];
        float           bsdf;
#if DEBUG
        fprintf(stderr, "Writing isotropic order %d ", samp_order);
        if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull);
        else fputs("raw data\n", stderr);
#endif
        data_prologue();                        /* begin output */
        if (pctcull >= 0) {
                sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d",
                                pctcull, samp_order);
                fflush(stdout);
                ofp = popen(cmd, "w");
                if (ofp == NULL) {
                        fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
                                        progname);
                        exit(1);
                }
                SET_FILE_BINARY(ofp);
        } else
                fputs("{\n", stdout);
                                                /* run through directions */
        for (ix = 0; ix < sqres/2; ix++) {
                RBFNODE *rbf = NULL;
                iovec[0] = (ix+.5)/sqres - 1.;
                iovec[1] = .0;
                iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
                if (funame == NULL)
                        rbf = advect_rbf(iovec);
                for (ox = 0; ox < sqres; ox++)
                    for (oy = 0; oy < sqres; oy++) {
                        SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
                        iovec[5] = output_orient *
                                sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
                        if (funame == NULL)
                                bsdf = eval_rbfrep(rbf, iovec+3) *
                                                output_orient/iovec[5];
                        else
                                bsdf = funvalue(funame, 6, iovec);
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                    }
                if (rbf != NULL)
                        free(rbf);
        }
        if (pctcull >= 0) {                     /* finish output */
                if (pclose(ofp)) {
                        fprintf(stderr, "%s: error running '%s'\n",
                                        progname, cmd);
                        exit(1);
                }
        } else {
                for (ix = sqres*sqres*sqres/2; ix--; )
                        fputs("\t0\n", stdout);
                fputs("}\n", stdout);
        }
        data_epilogue();
}

/* Interpolate and output anisotropic BSDF data */
static void
eval_anisotropic(char *funame)
{
        const int       sqres = 1<<samp_order;
        FILE            *ofp = NULL;
        char            cmd[128];
        int             ix, iy, ox, oy;
        double          iovec[6];
        float           bsdf;
#if DEBUG
        fprintf(stderr, "Writing anisotropic order %d ", samp_order);
        if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull);
        else fputs("raw data\n", stderr);
#endif
        data_prologue();                        /* begin output */
        if (pctcull >= 0) {
                sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d",
                                pctcull, samp_order);
                fflush(stdout);
                ofp = popen(cmd, "w");
                if (ofp == NULL) {
                        fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
                                        progname);
                        exit(1);
                }
        } else
                fputs("{\n", stdout);
                                                /* run through directions */
        for (ix = 0; ix < sqres; ix++)
            for (iy = 0; iy < sqres; iy++) {
                RBFNODE *rbf = NULL;            /* Klems reversal */
                SDsquare2disk(iovec, (ix+.5)/sqres, (iy+.5)/sqres);
                iovec[0] = -iovec[0]; iovec[1] = -iovec[1];
                iovec[2] = input_orient *
                                sqrt(1. - iovec[0]*iovec[0] - iovec[1]*iovec[1]);
                if (funame == NULL)
                        rbf = advect_rbf(iovec);
                for (ox = 0; ox < sqres; ox++)
                    for (oy = 0; oy < sqres; oy++) {
                        SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
                        iovec[5] = output_orient *
                                sqrt(1. - iovec[3]*iovec[3] - iovec[4]*iovec[4]);
                        if (funame == NULL)
                                bsdf = eval_rbfrep(rbf, iovec+3) *
                                                output_orient/iovec[5];
                        else
                                bsdf = funvalue(funame, 6, iovec);
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                    }
                if (rbf != NULL)
                        free(rbf);
            }
        if (pctcull >= 0) {                     /* finish output */
                if (pclose(ofp)) {
                        fprintf(stderr, "%s: error running '%s'\n",
                                        progname, cmd);
                        exit(1);
                }
        } else
                fputs("}\n", stdout);
        data_epilogue();
}

/* Read in BSDF and interpolate as tensor tree representation */
int
main(int argc, char *argv[])
{
        int     dofwd = 0, dobwd = 1;
        int     i, na;

        progname = argv[0];
        esupport |= E_VARIABLE|E_FUNCTION|E_RCONST;
        esupport &= ~(E_INCHAN|E_OUTCHAN);
        scompile("PI:3.14159265358979323846", NULL, 0);
        biggerlib();
        for (i = 1; i < argc-1 && (argv[i][0] == '-') | (argv[i][0] == '+'); i++)
                switch (argv[i][1]) {           /* get options */
                case 'e':
                        scompile(argv[++i], NULL, 0);
                        break;
                case 'f':
                        if (!argv[i][2])
                                fcompile(argv[++i]);
                        else
                                dofwd = (argv[i][0] == '+');
                        break;
                case 'b':
                        dobwd = (argv[i][0] == '+');
                        break;
                case 't':
                        switch (argv[i][2]) {
                        case '3':
                                single_plane_incident = 0;
                                break;
                        case '4':
                                single_plane_incident = 1;
                                break;
                        case '\0':
                                pctcull = atof(argv[++i]);
                                break;
                        default:
                                goto userr;
                        }
                        break;
                case 'g':
                        samp_order = atoi(argv[++i]);
                        break;
                default:
                        goto userr;
                }
        if (single_plane_incident >= 0) {       /* function-based BSDF? */
                void    (*evf)(char *s) = single_plane_incident ?
                                &eval_isotropic : &eval_anisotropic;
                if (i != argc-1 || fundefined(argv[i]) != 6)
                        goto userr;
                xml_prologue(argc, argv);       /* start XML output */
                if (dofwd) {
                        input_orient = -1;
                        output_orient = -1;
                        (*evf)(argv[i]);        /* outside reflectance */
                        output_orient = 1;
                        (*evf)(argv[i]);        /* outside -> inside */
                }
                if (dobwd) {
                        input_orient = 1;
                        output_orient = 1;
                        (*evf)(argv[i]);        /* inside reflectance */
                        output_orient = -1;
                        (*evf)(argv[i]);        /* inside -> outside */
                }
                xml_epilogue();                 /* finish XML output & exit */
                return(0);
        }
        if (i < argc) {                         /* open input files if given */
                xml_prologue(argc, argv);       /* start XML output */
                for ( ; i < argc; i++) {        /* interpolate each component */
                        FILE    *fpin = fopen(argv[i], "rb");
                        if (fpin == NULL) {
                                fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
                                                progname, argv[i]);
                                return(1);
                        }
                        if (!load_bsdf_rep(fpin))
                                return(1);
                        fclose(fpin);
                        if (single_plane_incident)
                                eval_isotropic(NULL);
                        else
                                eval_anisotropic(NULL);
                }
                xml_epilogue();                 /* finish XML output & exit */
                return(0);
        }
        SET_FILE_BINARY(stdin);                 /* load from stdin */
        if (!load_bsdf_rep(stdin))
                return(1);
        xml_prologue(argc, argv);               /* start XML output */
        if (single_plane_incident)              /* resample dist. */
                eval_isotropic(NULL);
        else
                eval_anisotropic(NULL);
        xml_epilogue();                         /* finish XML output & exit */
        return(0);
userr:
        fprintf(stderr,
        "Usage: %s [-g Nlog2][-t pctcull] [bsdf.sir ..] > bsdf.xml\n",
                                progname);
        fprintf(stderr,
        "   or: %s -t{3|4} [-g Nlog2][-t pctcull][{+|-}for[ward]][{+|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
                                progname);
        return(1);
}
Revision:	2.11
Committed:	Fri Mar 22 02:15:06 2013 UTC (11 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.10:	+195 -105 lines
Log Message:	Added ability to generate tensor tree directly from function
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.11	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.10 2012/12/12 04:49:59 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Load measured BSDF interpolant and write out as XML file with tensor tree.
6			*
7			* G. Ward
8			*/
9
10			#define _USE_MATH_DEFINES
11			#include <stdio.h>
12			#include <stdlib.h>
13			#include <math.h>
14			#include "platform.h"
15	greg	2.11	#include "calcomp.h"
16	greg	2.1	#include "bsdfrep.h"
17			/* global argv[0] */
18			char *progname;
19			/* percentage to cull (<0 to turn off) */
20	greg	2.7	double pctcull = 90.;
21	greg	2.1	/* sampling order */
22			int samp_order = 6;
23
24	greg	2.11	/* Output XML prologue to stdout */
25			static void
26			xml_prologue(int ac, char *av[])
27			{
28			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
29			puts("<WindowElement xmlns=\"http://windows.lbl.gov\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://windows.lbl.gov/BSDF-v1.4.xsd\">");
30			fputs("<!-- File produced by:", stdout);
31			while (ac-- > 0) {
32			fputc(' ', stdout);
33			fputs(*av++, stdout);
34			}
35			puts(" -->");
36			puts("<WindowElementType>System</WindowElementType>");
37			puts("<FileType>BSDF</FileType>");
38			puts("<Optical>");
39			puts("<Layer>");
40			puts("\t<Material>");
41			puts("\t\t<Name>Name</Name>");
42			puts("\t\t<Manufacturer>Manufacturer</Manufacturer>");
43			puts("\t\t<DeviceType>Other</DeviceType>");
44			puts("\t</Material>");
45			puts("\t<DataDefinition>");
46			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
47			single_plane_incident ? '3' : '4');
48			puts("\t</DataDefinition>");
49			}
50
51			/* Output XML data prologue to stdout */
52			static void
53			data_prologue()
54			{
55			static const char *bsdf_type[4] = {
56			"Reflection Front",
57			"Transmission Front",
58			"Transmission Back",
59			"Reflection Back"
60			};
61
62			puts("\t<WavelengthData>");
63			puts("\t\t<LayerNumber>System</LayerNumber>");
64			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
65			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
66			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
67			puts("\t\t<WavelengthDataBlock>");
68			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
69			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
70			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
71			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
72			puts("\t\t\t<ScatteringData>");
73			}
74
75			/* Output XML data epilogue to stdout */
76			static void
77			data_epilogue(void)
78			{
79			puts("\t\t\t</ScatteringData>");
80			puts("\t\t</WavelengthDataBlock>");
81			puts("\t</WavelengthData>");
82			}
83
84			/* Output XML epilogue to stdout */
85			static void
86			xml_epilogue(void)
87			{
88			puts("</Layer>");
89			puts("</Optical>");
90			puts("</WindowElement>");
91			}
92
93	greg	2.1	/* Interpolate and output isotropic BSDF data */
94			static void
95	greg	2.11	eval_isotropic(char *funame)
96	greg	2.1	{
97			const int sqres = 1<<samp_order;
98			FILE *ofp = NULL;
99			char cmd[128];
100			int ix, ox, oy;
101	greg	2.11	double iovec[6];
102	greg	2.4	float bsdf;
103	greg	2.1	#if DEBUG
104			fprintf(stderr, "Writing isotropic order %d ", samp_order);
105	greg	2.8	if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull);
106	greg	2.1	else fputs("raw data\n", stderr);
107			#endif
108	greg	2.11	data_prologue(); /* begin output */
109			if (pctcull >= 0) {
110	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d",
111	greg	2.1	pctcull, samp_order);
112			fflush(stdout);
113			ofp = popen(cmd, "w");
114			if (ofp == NULL) {
115			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
116			progname);
117			exit(1);
118			}
119			SET_FILE_BINARY(ofp);
120			} else
121			fputs("{\n", stdout);
122			/* run through directions */
123			for (ix = 0; ix < sqres/2; ix++) {
124	greg	2.11	RBFNODE *rbf = NULL;
125			iovec[0] = (ix+.5)/sqres - 1.;
126			iovec[1] = .0;
127			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
128			if (funame == NULL)
129			rbf = advect_rbf(iovec);
130	greg	2.1	for (ox = 0; ox < sqres; ox++)
131			for (oy = 0; oy < sqres; oy++) {
132	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
133			iovec[5] = output_orient *
134			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
135			if (funame == NULL)
136			bsdf = eval_rbfrep(rbf, iovec+3) *
137			output_orient/iovec[5];
138			else
139			bsdf = funvalue(funame, 6, iovec);
140	greg	2.1	if (pctcull >= 0)
141			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
142			else
143			printf("\t%.3e\n", bsdf);
144			}
145	greg	2.3	if (rbf != NULL)
146			free(rbf);
147	greg	2.1	}
148			if (pctcull >= 0) { /* finish output */
149			if (pclose(ofp)) {
150			fprintf(stderr, "%s: error running '%s'\n",
151			progname, cmd);
152			exit(1);
153			}
154			} else {
155			for (ix = sqressqressqres/2; ix--; )
156			fputs("\t0\n", stdout);
157			fputs("}\n", stdout);
158			}
159	greg	2.11	data_epilogue();
160	greg	2.1	}
161
162			/* Interpolate and output anisotropic BSDF data */
163			static void
164	greg	2.11	eval_anisotropic(char *funame)
165	greg	2.1	{
166			const int sqres = 1<<samp_order;
167			FILE *ofp = NULL;
168			char cmd[128];
169			int ix, iy, ox, oy;
170	greg	2.11	double iovec[6];
171	greg	2.4	float bsdf;
172	greg	2.1	#if DEBUG
173			fprintf(stderr, "Writing anisotropic order %d ", samp_order);
174	greg	2.8	if (pctcull >= 0) fprintf(stderr, "data with %.1f%% culling\n", pctcull);
175	greg	2.1	else fputs("raw data\n", stderr);
176			#endif
177	greg	2.11	data_prologue(); /* begin output */
178			if (pctcull >= 0) {
179	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d",
180	greg	2.1	pctcull, samp_order);
181			fflush(stdout);
182			ofp = popen(cmd, "w");
183			if (ofp == NULL) {
184			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
185			progname);
186			exit(1);
187			}
188			} else
189			fputs("{\n", stdout);
190			/* run through directions */
191			for (ix = 0; ix < sqres; ix++)
192			for (iy = 0; iy < sqres; iy++) {
193	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
194			SDsquare2disk(iovec, (ix+.5)/sqres, (iy+.5)/sqres);
195			iovec[0] = -iovec[0]; iovec[1] = -iovec[1];
196			iovec[2] = input_orient *
197			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
198			if (funame == NULL)
199			rbf = advect_rbf(iovec);
200	greg	2.1	for (ox = 0; ox < sqres; ox++)
201			for (oy = 0; oy < sqres; oy++) {
202	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
203			iovec[5] = output_orient *
204			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
205			if (funame == NULL)
206			bsdf = eval_rbfrep(rbf, iovec+3) *
207			output_orient/iovec[5];
208			else
209			bsdf = funvalue(funame, 6, iovec);
210	greg	2.1	if (pctcull >= 0)
211			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
212			else
213			printf("\t%.3e\n", bsdf);
214			}
215	greg	2.3	if (rbf != NULL)
216			free(rbf);
217	greg	2.1	}
218			if (pctcull >= 0) { /* finish output */
219			if (pclose(ofp)) {
220			fprintf(stderr, "%s: error running '%s'\n",
221			progname, cmd);
222			exit(1);
223			}
224			} else
225			fputs("}\n", stdout);
226	greg	2.11	data_epilogue();
227	greg	2.5	}
228
229	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
230			int
231			main(int argc, char *argv[])
232			{
233	greg	2.11	int dofwd = 0, dobwd = 1;
234			int i, na;
235	greg	2.1
236	greg	2.5	progname = argv[0];
237	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
238			esupport &= ~(E_INCHAN\|E_OUTCHAN);
239			scompile("PI:3.14159265358979323846", NULL, 0);
240			biggerlib();
241			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
242			switch (argv[i][1]) { /* get options */
243			case 'e':
244			scompile(argv[++i], NULL, 0);
245			break;
246			case 'f':
247			if (!argv[i][2])
248			fcompile(argv[++i]);
249			else
250			dofwd = (argv[i][0] == '+');
251			break;
252			case 'b':
253			dobwd = (argv[i][0] == '+');
254			break;
255	greg	2.1	case 't':
256	greg	2.11	switch (argv[i][2]) {
257			case '3':
258			single_plane_incident = 0;
259			break;
260			case '4':
261			single_plane_incident = 1;
262			break;
263			case '\0':
264			pctcull = atof(argv[++i]);
265			break;
266			default:
267			goto userr;
268			}
269	greg	2.1	break;
270			case 'g':
271	greg	2.5	samp_order = atoi(argv[++i]);
272	greg	2.1	break;
273			default:
274			goto userr;
275			}
276	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
277			void (evf)(char s) = single_plane_incident ?
278			&eval_isotropic : &eval_anisotropic;
279			if (i != argc-1 \|\| fundefined(argv[i]) != 6)
280			goto userr;
281			xml_prologue(argc, argv); /* start XML output */
282			if (dofwd) {
283			input_orient = -1;
284			output_orient = -1;
285			(evf)(argv[i]); / outside reflectance */
286			output_orient = 1;
287			(evf)(argv[i]); / outside -> inside */
288			}
289			if (dobwd) {
290			input_orient = 1;
291			output_orient = 1;
292			(evf)(argv[i]); / inside reflectance */
293			output_orient = -1;
294			(evf)(argv[i]); / inside -> outside */
295			}
296			xml_epilogue(); /* finish XML output & exit */
297			return(0);
298			}
299			if (i < argc) { /* open input files if given */
300			xml_prologue(argc, argv); /* start XML output */
301			for ( ; i < argc; i++) { /* interpolate each component */
302			FILE *fpin = fopen(argv[i], "rb");
303			if (fpin == NULL) {
304			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
305			progname, argv[i]);
306			return(1);
307			}
308			if (!load_bsdf_rep(fpin))
309			return(1);
310			fclose(fpin);
311			if (single_plane_incident)
312			eval_isotropic(NULL);
313			else
314			eval_anisotropic(NULL);
315			}
316			xml_epilogue(); /* finish XML output & exit */
317			return(0);
318			}
319			SET_FILE_BINARY(stdin); /* load from stdin */
320			if (!load_bsdf_rep(stdin))
321	greg	2.1	return(1);
322	greg	2.5	xml_prologue(argc, argv); /* start XML output */
323	greg	2.1	if (single_plane_incident) /* resample dist. */
324	greg	2.11	eval_isotropic(NULL);
325	greg	2.1	else
326	greg	2.11	eval_anisotropic(NULL);
327			xml_epilogue(); /* finish XML output & exit */
328	greg	2.1	return(0);
329			userr:
330			fprintf(stderr,
331	greg	2.11	"Usage: %s [-g Nlog2][-t pctcull] [bsdf.sir ..] > bsdf.xml\n",
332			progname);
333			fprintf(stderr,
334			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
335	greg	2.1	progname);
336			return(1);
337			}