src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.14 2013/03/23 04:14:50 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;
                                /* super-sampling threshold */
const double            ssamp_thresh = 0.35;
                                /* number of super-samples */
const int               nssamp = 100;

/* 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>");
}

/* Compute absolute relative difference */
static double
abs_diff(double v1, double v0)
{
        if ((v0 < 0) | (v1 < 0))
                return(.0);
        v1 = (v1-v0)*2./(v0+v1+.0001);
        if (v1 < 0)
                return(-v1);
        return(v1);
}

/* 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;

        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] = 2.*(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++) {
                    float       last_bsdf = -1;
                    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 {
                            double      ssa[3], ssvec[6];
                            int         ssi;
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                bsdf = 0;       /* super-sample voxel */
                                for (ssi = nssamp; ssi--; ) {
                                    SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp);
                                    ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
                                    ssvec[1] = .0;
                                    ssvec[2] = input_orient *
                                                sqrt(1. - ssvec[0]*ssvec[0]);
                                    SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
                                                (oy+ssa[2])/sqres);
                                    ssvec[5] = output_orient *
                                                sqrt(1. - ssvec[3]*ssvec[3] -
                                                        ssvec[4]*ssvec[4]);
                                    bsdf += funvalue(funame, 6, ssvec);
                                }
                                bsdf /= (float)nssamp;
                            }
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = 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;

        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, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
                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++) {
                    float       last_bsdf = -1;
                    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 {
                            double      ssa[4], ssvec[6];
                            int         ssi;
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                bsdf = 0;       /* super-sample voxel */
                                for (ssi = nssamp; ssi--; ) {
                                    SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp);
                                    SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
                                                1.-(iy+ssa[1])/sqres);
                                    ssvec[2] = output_orient *
                                                sqrt(1. - ssvec[0]*ssvec[0] -
                                                        ssvec[1]*ssvec[1]);
                                    SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
                                                (oy+ssa[3])/sqres);
                                    ssvec[5] = output_orient *
                                                sqrt(1. - ssvec[3]*ssvec[3] -
                                                        ssvec[4]*ssvec[4]);
                                    bsdf += funvalue(funame, 6, ssvec);
                                }
                                bsdf /= (float)nssamp;
                            }
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = 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 = 1;
                                break;
                        case '4':
                                single_plane_incident = 0;
                                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) {
                        fprintf(stderr,
        "%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
                                        progname);
                        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 */
                int     nbsdf = 0;
                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 (!nbsdf++)           /* start XML on first dist. */
                                xml_prologue(argc, argv);
                        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:	2.15
Committed:	Wed May 15 03:22:31 2013 UTC (10 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.14:	+75 -21 lines
Log Message:	Added super-sampling at peaks
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.15	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.14 2013/03/23 04:14:50 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	greg	2.15	/* super-sampling threshold */
24			const double ssamp_thresh = 0.35;
25			/* number of super-samples */
26			const int nssamp = 100;
27	greg	2.1
28	greg	2.11	/* Output XML prologue to stdout */
29			static void
30			xml_prologue(int ac, char *av[])
31			{
32			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
33			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\">");
34			fputs("<!-- File produced by:", stdout);
35			while (ac-- > 0) {
36			fputc(' ', stdout);
37			fputs(*av++, stdout);
38			}
39			puts(" -->");
40			puts("<WindowElementType>System</WindowElementType>");
41			puts("<FileType>BSDF</FileType>");
42			puts("<Optical>");
43			puts("<Layer>");
44			puts("\t<Material>");
45			puts("\t\t<Name>Name</Name>");
46			puts("\t\t<Manufacturer>Manufacturer</Manufacturer>");
47			puts("\t\t<DeviceType>Other</DeviceType>");
48			puts("\t</Material>");
49			puts("\t<DataDefinition>");
50			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
51			single_plane_incident ? '3' : '4');
52			puts("\t</DataDefinition>");
53			}
54
55			/* Output XML data prologue to stdout */
56			static void
57			data_prologue()
58			{
59			static const char *bsdf_type[4] = {
60			"Reflection Front",
61			"Transmission Front",
62			"Transmission Back",
63			"Reflection Back"
64			};
65
66			puts("\t<WavelengthData>");
67			puts("\t\t<LayerNumber>System</LayerNumber>");
68			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
69			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
70			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
71			puts("\t\t<WavelengthDataBlock>");
72			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
73			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
74			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
75			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
76			puts("\t\t\t<ScatteringData>");
77			}
78
79			/* Output XML data epilogue to stdout */
80			static void
81			data_epilogue(void)
82			{
83			puts("\t\t\t</ScatteringData>");
84			puts("\t\t</WavelengthDataBlock>");
85			puts("\t</WavelengthData>");
86			}
87
88			/* Output XML epilogue to stdout */
89			static void
90			xml_epilogue(void)
91			{
92			puts("</Layer>");
93			puts("</Optical>");
94			puts("</WindowElement>");
95			}
96
97	greg	2.15	/* Compute absolute relative difference */
98			static double
99			abs_diff(double v1, double v0)
100			{
101			if ((v0 < 0) \| (v1 < 0))
102			return(.0);
103			v1 = (v1-v0)*2./(v0+v1+.0001);
104			if (v1 < 0)
105			return(-v1);
106			return(v1);
107			}
108
109	greg	2.1	/* Interpolate and output isotropic BSDF data */
110			static void
111	greg	2.11	eval_isotropic(char *funame)
112	greg	2.1	{
113			const int sqres = 1<<samp_order;
114			FILE *ofp = NULL;
115			char cmd[128];
116			int ix, ox, oy;
117	greg	2.11	double iovec[6];
118	greg	2.4	float bsdf;
119	greg	2.15
120	greg	2.11	data_prologue(); /* begin output */
121			if (pctcull >= 0) {
122	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d",
123	greg	2.1	pctcull, samp_order);
124			fflush(stdout);
125			ofp = popen(cmd, "w");
126			if (ofp == NULL) {
127			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
128			progname);
129			exit(1);
130			}
131			SET_FILE_BINARY(ofp);
132			} else
133			fputs("{\n", stdout);
134			/* run through directions */
135			for (ix = 0; ix < sqres/2; ix++) {
136	greg	2.11	RBFNODE *rbf = NULL;
137	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
138	greg	2.11	iovec[1] = .0;
139			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
140			if (funame == NULL)
141			rbf = advect_rbf(iovec);
142	greg	2.15	for (ox = 0; ox < sqres; ox++) {
143			float last_bsdf = -1;
144	greg	2.1	for (oy = 0; oy < sqres; oy++) {
145	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
146			iovec[5] = output_orient *
147			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
148			if (funame == NULL)
149	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
150	greg	2.11	output_orient/iovec[5];
151	greg	2.15	else {
152			double ssa[3], ssvec[6];
153			int ssi;
154			bsdf = funvalue(funame, 6, iovec);
155			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
156			bsdf = 0; /* super-sample voxel */
157			for (ssi = nssamp; ssi--; ) {
158			SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp);
159			ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
160			ssvec[1] = .0;
161			ssvec[2] = input_orient *
162			sqrt(1. - ssvec[0]*ssvec[0]);
163			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
164			(oy+ssa[2])/sqres);
165			ssvec[5] = output_orient *
166			sqrt(1. - ssvec[3]*ssvec[3] -
167			ssvec[4]*ssvec[4]);
168			bsdf += funvalue(funame, 6, ssvec);
169			}
170			bsdf /= (float)nssamp;
171			}
172			}
173	greg	2.1	if (pctcull >= 0)
174			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
175			else
176			printf("\t%.3e\n", bsdf);
177	greg	2.15	last_bsdf = bsdf;
178	greg	2.1	}
179	greg	2.15	}
180	greg	2.3	if (rbf != NULL)
181			free(rbf);
182	greg	2.1	}
183			if (pctcull >= 0) { /* finish output */
184			if (pclose(ofp)) {
185			fprintf(stderr, "%s: error running '%s'\n",
186			progname, cmd);
187			exit(1);
188			}
189			} else {
190			for (ix = sqressqressqres/2; ix--; )
191			fputs("\t0\n", stdout);
192			fputs("}\n", stdout);
193			}
194	greg	2.11	data_epilogue();
195	greg	2.1	}
196
197			/* Interpolate and output anisotropic BSDF data */
198			static void
199	greg	2.11	eval_anisotropic(char *funame)
200	greg	2.1	{
201			const int sqres = 1<<samp_order;
202			FILE *ofp = NULL;
203			char cmd[128];
204			int ix, iy, ox, oy;
205	greg	2.11	double iovec[6];
206	greg	2.4	float bsdf;
207	greg	2.15
208	greg	2.11	data_prologue(); /* begin output */
209			if (pctcull >= 0) {
210	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d",
211	greg	2.1	pctcull, samp_order);
212			fflush(stdout);
213			ofp = popen(cmd, "w");
214			if (ofp == NULL) {
215			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
216			progname);
217			exit(1);
218			}
219			} else
220			fputs("{\n", stdout);
221			/* run through directions */
222			for (ix = 0; ix < sqres; ix++)
223			for (iy = 0; iy < sqres; iy++) {
224	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
225	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
226	greg	2.11	iovec[2] = input_orient *
227			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
228			if (funame == NULL)
229			rbf = advect_rbf(iovec);
230	greg	2.15	for (ox = 0; ox < sqres; ox++) {
231			float last_bsdf = -1;
232	greg	2.1	for (oy = 0; oy < sqres; oy++) {
233	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
234			iovec[5] = output_orient *
235			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
236			if (funame == NULL)
237	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
238	greg	2.11	output_orient/iovec[5];
239	greg	2.15	else {
240			double ssa[4], ssvec[6];
241			int ssi;
242			bsdf = funvalue(funame, 6, iovec);
243			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
244			bsdf = 0; /* super-sample voxel */
245			for (ssi = nssamp; ssi--; ) {
246			SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp);
247			SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
248			1.-(iy+ssa[1])/sqres);
249			ssvec[2] = output_orient *
250			sqrt(1. - ssvec[0]*ssvec[0] -
251			ssvec[1]*ssvec[1]);
252			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
253			(oy+ssa[3])/sqres);
254			ssvec[5] = output_orient *
255			sqrt(1. - ssvec[3]*ssvec[3] -
256			ssvec[4]*ssvec[4]);
257			bsdf += funvalue(funame, 6, ssvec);
258			}
259			bsdf /= (float)nssamp;
260			}
261			}
262	greg	2.1	if (pctcull >= 0)
263			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
264			else
265			printf("\t%.3e\n", bsdf);
266	greg	2.15	last_bsdf = bsdf;
267	greg	2.1	}
268	greg	2.15	}
269	greg	2.3	if (rbf != NULL)
270			free(rbf);
271	greg	2.1	}
272			if (pctcull >= 0) { /* finish output */
273			if (pclose(ofp)) {
274			fprintf(stderr, "%s: error running '%s'\n",
275			progname, cmd);
276			exit(1);
277			}
278			} else
279			fputs("}\n", stdout);
280	greg	2.11	data_epilogue();
281	greg	2.5	}
282
283	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
284			int
285			main(int argc, char *argv[])
286			{
287	greg	2.11	int dofwd = 0, dobwd = 1;
288			int i, na;
289	greg	2.1
290	greg	2.5	progname = argv[0];
291	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
292			esupport &= ~(E_INCHAN\|E_OUTCHAN);
293			scompile("PI:3.14159265358979323846", NULL, 0);
294			biggerlib();
295			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
296			switch (argv[i][1]) { /* get options */
297			case 'e':
298			scompile(argv[++i], NULL, 0);
299			break;
300			case 'f':
301			if (!argv[i][2])
302			fcompile(argv[++i]);
303			else
304			dofwd = (argv[i][0] == '+');
305			break;
306			case 'b':
307			dobwd = (argv[i][0] == '+');
308			break;
309	greg	2.1	case 't':
310	greg	2.11	switch (argv[i][2]) {
311			case '3':
312	greg	2.13	single_plane_incident = 1;
313	greg	2.11	break;
314			case '4':
315	greg	2.13	single_plane_incident = 0;
316	greg	2.11	break;
317			case '\0':
318			pctcull = atof(argv[++i]);
319			break;
320			default:
321			goto userr;
322			}
323	greg	2.1	break;
324			case 'g':
325	greg	2.5	samp_order = atoi(argv[++i]);
326	greg	2.1	break;
327			default:
328			goto userr;
329			}
330	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
331			void (evf)(char s) = single_plane_incident ?
332			&eval_isotropic : &eval_anisotropic;
333	greg	2.12	if (i != argc-1 \|\| fundefined(argv[i]) != 6) {
334			fprintf(stderr,
335			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
336			progname);
337	greg	2.11	goto userr;
338	greg	2.12	}
339	greg	2.11	xml_prologue(argc, argv); /* start XML output */
340			if (dofwd) {
341			input_orient = -1;
342			output_orient = -1;
343			(evf)(argv[i]); / outside reflectance */
344			output_orient = 1;
345			(evf)(argv[i]); / outside -> inside */
346			}
347			if (dobwd) {
348			input_orient = 1;
349			output_orient = 1;
350			(evf)(argv[i]); / inside reflectance */
351			output_orient = -1;
352			(evf)(argv[i]); / inside -> outside */
353			}
354			xml_epilogue(); /* finish XML output & exit */
355			return(0);
356			}
357			if (i < argc) { /* open input files if given */
358	greg	2.12	int nbsdf = 0;
359	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
360			FILE *fpin = fopen(argv[i], "rb");
361			if (fpin == NULL) {
362			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
363			progname, argv[i]);
364			return(1);
365			}
366			if (!load_bsdf_rep(fpin))
367			return(1);
368			fclose(fpin);
369	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
370			xml_prologue(argc, argv);
371	greg	2.11	if (single_plane_incident)
372			eval_isotropic(NULL);
373			else
374			eval_anisotropic(NULL);
375			}
376			xml_epilogue(); /* finish XML output & exit */
377			return(0);
378			}
379			SET_FILE_BINARY(stdin); /* load from stdin */
380			if (!load_bsdf_rep(stdin))
381	greg	2.1	return(1);
382	greg	2.5	xml_prologue(argc, argv); /* start XML output */
383	greg	2.1	if (single_plane_incident) /* resample dist. */
384	greg	2.11	eval_isotropic(NULL);
385	greg	2.1	else
386	greg	2.11	eval_anisotropic(NULL);
387			xml_epilogue(); /* finish XML output & exit */
388	greg	2.1	return(0);
389			userr:
390			fprintf(stderr,
391	greg	2.11	"Usage: %s [-g Nlog2][-t pctcull] [bsdf.sir ..] > bsdf.xml\n",
392			progname);
393			fprintf(stderr,
394			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
395	greg	2.1	progname);
396			return(1);
397			}