src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.16 2013/05/15 17:29:30 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;
        int             assignD = 0;
        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);
                                                /* need to assign Dx, Dy, Dz? */
        if (funame != NULL)
                assignD = (fundefined(funame) < 6);
                                                /* 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], sum;
                            int         ssi;
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                sum = 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]);
                                    if (assignD) {
                                        varset("Dx", '=', -iovec[3]);
                                        varset("Dy", '=', -iovec[4]);
                                        varset("Dz", '=', -iovec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/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;
        int             assignD = 0;
        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);
                                                /* need to assign Dx, Dy, Dz? */
        if (funame != NULL)
                assignD = (fundefined(funame) < 6);
                                                /* 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], sum;
                            int         ssi;
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                sum = 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]);
                                    if (assignD) {
                                        varset("Dx", '=', -iovec[3]);
                                        varset("Dy", '=', -iovec[4]);
                                        varset("Dz", '=', -iovec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/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]) < 3) {
                        fprintf(stderr,
        "%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
                                        progname);
                        fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n",
                                        progname);
                        goto userr;
                }
                ++eclock;
                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:	2.17
Committed:	Fri Aug 2 20:56:19 2013 UTC (10 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.16:	+37 -2 lines
Log Message:	Added ability to use Dx, Dy and Dz instead of last 3 function parameters
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.17	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.16 2013/05/15 17:29:30 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	greg	2.17	int assignD = 0;
116	greg	2.1	char cmd[128];
117			int ix, ox, oy;
118	greg	2.11	double iovec[6];
119	greg	2.4	float bsdf;
120	greg	2.15
121	greg	2.11	data_prologue(); /* begin output */
122			if (pctcull >= 0) {
123	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 3 -t %f -g %d",
124	greg	2.1	pctcull, samp_order);
125			fflush(stdout);
126			ofp = popen(cmd, "w");
127			if (ofp == NULL) {
128			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
129			progname);
130			exit(1);
131			}
132			SET_FILE_BINARY(ofp);
133			} else
134			fputs("{\n", stdout);
135	greg	2.17	/* need to assign Dx, Dy, Dz? */
136			if (funame != NULL)
137			assignD = (fundefined(funame) < 6);
138	greg	2.1	/* run through directions */
139			for (ix = 0; ix < sqres/2; ix++) {
140	greg	2.11	RBFNODE *rbf = NULL;
141	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
142	greg	2.11	iovec[1] = .0;
143			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
144			if (funame == NULL)
145			rbf = advect_rbf(iovec);
146	greg	2.15	for (ox = 0; ox < sqres; ox++) {
147			float last_bsdf = -1;
148	greg	2.1	for (oy = 0; oy < sqres; oy++) {
149	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
150			iovec[5] = output_orient *
151			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
152			if (funame == NULL)
153	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
154	greg	2.11	output_orient/iovec[5];
155	greg	2.15	else {
156	greg	2.16	double ssa[3], ssvec[6], sum;
157	greg	2.15	int ssi;
158	greg	2.17	if (assignD) {
159			varset("Dx", '=', -iovec[3]);
160			varset("Dy", '=', -iovec[4]);
161			varset("Dz", '=', -iovec[5]);
162			++eclock;
163			}
164	greg	2.15	bsdf = funvalue(funame, 6, iovec);
165			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
166	greg	2.16	sum = 0; /* super-sample voxel */
167	greg	2.15	for (ssi = nssamp; ssi--; ) {
168			SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp);
169			ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
170			ssvec[1] = .0;
171			ssvec[2] = input_orient *
172			sqrt(1. - ssvec[0]*ssvec[0]);
173			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
174			(oy+ssa[2])/sqres);
175			ssvec[5] = output_orient *
176			sqrt(1. - ssvec[3]*ssvec[3] -
177			ssvec[4]*ssvec[4]);
178	greg	2.17	if (assignD) {
179			varset("Dx", '=', -iovec[3]);
180			varset("Dy", '=', -iovec[4]);
181			varset("Dz", '=', -iovec[5]);
182			++eclock;
183			}
184	greg	2.16	sum += funvalue(funame, 6, ssvec);
185	greg	2.15	}
186	greg	2.16	bsdf = sum/nssamp;
187	greg	2.15	}
188			}
189	greg	2.1	if (pctcull >= 0)
190			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
191			else
192			printf("\t%.3e\n", bsdf);
193	greg	2.15	last_bsdf = bsdf;
194	greg	2.1	}
195	greg	2.15	}
196	greg	2.3	if (rbf != NULL)
197			free(rbf);
198	greg	2.1	}
199			if (pctcull >= 0) { /* finish output */
200			if (pclose(ofp)) {
201			fprintf(stderr, "%s: error running '%s'\n",
202			progname, cmd);
203			exit(1);
204			}
205			} else {
206			for (ix = sqressqressqres/2; ix--; )
207			fputs("\t0\n", stdout);
208			fputs("}\n", stdout);
209			}
210	greg	2.11	data_epilogue();
211	greg	2.1	}
212
213			/* Interpolate and output anisotropic BSDF data */
214			static void
215	greg	2.11	eval_anisotropic(char *funame)
216	greg	2.1	{
217			const int sqres = 1<<samp_order;
218			FILE *ofp = NULL;
219	greg	2.17	int assignD = 0;
220	greg	2.1	char cmd[128];
221			int ix, iy, ox, oy;
222	greg	2.11	double iovec[6];
223	greg	2.4	float bsdf;
224	greg	2.15
225	greg	2.11	data_prologue(); /* begin output */
226			if (pctcull >= 0) {
227	greg	2.7	sprintf(cmd, "rttree_reduce -h -a -ff -r 4 -t %f -g %d",
228	greg	2.1	pctcull, samp_order);
229			fflush(stdout);
230			ofp = popen(cmd, "w");
231			if (ofp == NULL) {
232			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
233			progname);
234			exit(1);
235			}
236			} else
237			fputs("{\n", stdout);
238	greg	2.17	/* need to assign Dx, Dy, Dz? */
239			if (funame != NULL)
240			assignD = (fundefined(funame) < 6);
241	greg	2.1	/* run through directions */
242			for (ix = 0; ix < sqres; ix++)
243			for (iy = 0; iy < sqres; iy++) {
244	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
245	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
246	greg	2.11	iovec[2] = input_orient *
247			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
248			if (funame == NULL)
249			rbf = advect_rbf(iovec);
250	greg	2.15	for (ox = 0; ox < sqres; ox++) {
251			float last_bsdf = -1;
252	greg	2.1	for (oy = 0; oy < sqres; oy++) {
253	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
254			iovec[5] = output_orient *
255			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
256			if (funame == NULL)
257	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
258	greg	2.11	output_orient/iovec[5];
259	greg	2.15	else {
260	greg	2.16	double ssa[4], ssvec[6], sum;
261	greg	2.15	int ssi;
262	greg	2.17	if (assignD) {
263			varset("Dx", '=', -iovec[3]);
264			varset("Dy", '=', -iovec[4]);
265			varset("Dz", '=', -iovec[5]);
266			++eclock;
267			}
268	greg	2.15	bsdf = funvalue(funame, 6, iovec);
269			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
270	greg	2.16	sum = 0; /* super-sample voxel */
271	greg	2.15	for (ssi = nssamp; ssi--; ) {
272			SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp);
273			SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
274			1.-(iy+ssa[1])/sqres);
275			ssvec[2] = output_orient *
276			sqrt(1. - ssvec[0]*ssvec[0] -
277			ssvec[1]*ssvec[1]);
278			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
279			(oy+ssa[3])/sqres);
280			ssvec[5] = output_orient *
281			sqrt(1. - ssvec[3]*ssvec[3] -
282			ssvec[4]*ssvec[4]);
283	greg	2.17	if (assignD) {
284			varset("Dx", '=', -iovec[3]);
285			varset("Dy", '=', -iovec[4]);
286			varset("Dz", '=', -iovec[5]);
287			++eclock;
288			}
289	greg	2.16	sum += funvalue(funame, 6, ssvec);
290	greg	2.15	}
291	greg	2.16	bsdf = sum/nssamp;
292	greg	2.15	}
293			}
294	greg	2.1	if (pctcull >= 0)
295			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
296			else
297			printf("\t%.3e\n", bsdf);
298	greg	2.15	last_bsdf = bsdf;
299	greg	2.1	}
300	greg	2.15	}
301	greg	2.3	if (rbf != NULL)
302			free(rbf);
303	greg	2.1	}
304			if (pctcull >= 0) { /* finish output */
305			if (pclose(ofp)) {
306			fprintf(stderr, "%s: error running '%s'\n",
307			progname, cmd);
308			exit(1);
309			}
310			} else
311			fputs("}\n", stdout);
312	greg	2.11	data_epilogue();
313	greg	2.5	}
314
315	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
316			int
317			main(int argc, char *argv[])
318			{
319	greg	2.11	int dofwd = 0, dobwd = 1;
320			int i, na;
321	greg	2.1
322	greg	2.5	progname = argv[0];
323	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
324			esupport &= ~(E_INCHAN\|E_OUTCHAN);
325			scompile("PI:3.14159265358979323846", NULL, 0);
326			biggerlib();
327			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
328			switch (argv[i][1]) { /* get options */
329			case 'e':
330			scompile(argv[++i], NULL, 0);
331			break;
332			case 'f':
333			if (!argv[i][2])
334			fcompile(argv[++i]);
335			else
336			dofwd = (argv[i][0] == '+');
337			break;
338			case 'b':
339			dobwd = (argv[i][0] == '+');
340			break;
341	greg	2.1	case 't':
342	greg	2.11	switch (argv[i][2]) {
343			case '3':
344	greg	2.13	single_plane_incident = 1;
345	greg	2.11	break;
346			case '4':
347	greg	2.13	single_plane_incident = 0;
348	greg	2.11	break;
349			case '\0':
350			pctcull = atof(argv[++i]);
351			break;
352			default:
353			goto userr;
354			}
355	greg	2.1	break;
356			case 'g':
357	greg	2.5	samp_order = atoi(argv[++i]);
358	greg	2.1	break;
359			default:
360			goto userr;
361			}
362	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
363			void (evf)(char s) = single_plane_incident ?
364			&eval_isotropic : &eval_anisotropic;
365	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
366	greg	2.12	fprintf(stderr,
367			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
368			progname);
369	greg	2.17	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n",
370			progname);
371	greg	2.11	goto userr;
372	greg	2.12	}
373	greg	2.17	++eclock;
374	greg	2.11	xml_prologue(argc, argv); /* start XML output */
375			if (dofwd) {
376			input_orient = -1;
377			output_orient = -1;
378			(evf)(argv[i]); / outside reflectance */
379			output_orient = 1;
380			(evf)(argv[i]); / outside -> inside */
381			}
382			if (dobwd) {
383			input_orient = 1;
384			output_orient = 1;
385			(evf)(argv[i]); / inside reflectance */
386			output_orient = -1;
387			(evf)(argv[i]); / inside -> outside */
388			}
389			xml_epilogue(); /* finish XML output & exit */
390			return(0);
391			}
392			if (i < argc) { /* open input files if given */
393	greg	2.12	int nbsdf = 0;
394	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
395			FILE *fpin = fopen(argv[i], "rb");
396			if (fpin == NULL) {
397			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
398			progname, argv[i]);
399			return(1);
400			}
401			if (!load_bsdf_rep(fpin))
402			return(1);
403			fclose(fpin);
404	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
405			xml_prologue(argc, argv);
406	greg	2.11	if (single_plane_incident)
407			eval_isotropic(NULL);
408			else
409			eval_anisotropic(NULL);
410			}
411			xml_epilogue(); /* finish XML output & exit */
412			return(0);
413			}
414			SET_FILE_BINARY(stdin); /* load from stdin */
415			if (!load_bsdf_rep(stdin))
416	greg	2.1	return(1);
417	greg	2.5	xml_prologue(argc, argv); /* start XML output */
418	greg	2.1	if (single_plane_incident) /* resample dist. */
419	greg	2.11	eval_isotropic(NULL);
420	greg	2.1	else
421	greg	2.11	eval_anisotropic(NULL);
422			xml_epilogue(); /* finish XML output & exit */
423	greg	2.1	return(0);
424			userr:
425			fprintf(stderr,
426	greg	2.11	"Usage: %s [-g Nlog2][-t pctcull] [bsdf.sir ..] > bsdf.xml\n",
427			progname);
428			fprintf(stderr,
429			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
430	greg	2.1	progname);
431			return(1);
432			}