src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.31 2016/01/29 16:21:55 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 "random.h"
#include "platform.h"
#include "rtprocess.h"
#include "calcomp.h"
#include "bsdfrep.h"
                                /* global argv[0] */
char                    *progname;
                                /* percentage to cull (<0 to turn off) */
static double           pctcull = 90.;
                                /* sampling order */
static int              samp_order = 6;
                                /* super-sampling threshold */
const double            ssamp_thresh = 0.35;
                                /* number of super-samples */
#ifndef NSSAMP
#define NSSAMP          100
#endif
                                /* limit on number of RBF lobes */
static int              lobe_lim = 15000;
                                /* progress bar length */
static int              do_prog = 79;


/* Start new progress bar */
#define prog_start(s)   if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else

/* Draw progress bar of the appropriate length */
static void
prog_show(double frac)
{
        static unsigned call_cnt = 0;
        static char     lastc[] = "-\\|/";
        char            pbar[256];
        int             nchars;

        if (do_prog <= 1) return;
        if (do_prog > sizeof(pbar)-2)
                do_prog = sizeof(pbar)-2;
        if (frac < 0) frac = 0;
        else if (frac >= 1) frac = .9999;
        nchars = do_prog*frac;
        pbar[0] = '\r';
        memset(pbar+1, '*', nchars);
        pbar[nchars+1] = lastc[call_cnt++ & 3];
        memset(pbar+2+nchars, '-', do_prog-nchars-1);
        pbar[do_prog+1] = '\0';
        fputs(pbar, stderr);
}

/* Finish progress bar */
static void
prog_done(void)
{
        int     n = do_prog;

        if (n <= 1) return;
        fputc('\r', stderr);
        while (n--)
                fputc(' ', stderr);
        fputc('\r', stderr);
}

/* 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>");
        printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
        printf("\t\t<Manufacturer>%s</Manufacturer>\n",
                        bsdf_manuf[0] ? bsdf_manuf : "Unknown");
        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 -a -h -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);
#ifdef getc_unlocked                            /* avoid lock/unlock overhead */
                flockfile(ofp);
#endif
        } 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, lobe_lim);
                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);
                        else {
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
#if (NSSAMP > 0)
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                int     ssi;
                                double  ssa[3], ssvec[6], sum = 0;
                                                /* super-sample voxel */
                                for (ssi = NSSAMP; ssi--; ) {
                                    SDmultiSamp(ssa, 3, (ssi+frandom()) *
                                                        (1./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", '=', -ssvec[3]);
                                        varset("Dy", '=', -ssvec[4]);
                                        varset("Dz", '=', -ssvec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/NSSAMP;
                            }
#endif
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = bsdf;
                    }
                }
                if (rbf != NULL)
                        free(rbf);
                prog_show((ix+1.)*(2./sqres));
        }
        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();
        prog_done();
}

/* 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%s -h -ff -r 4 -t %f -g %d",
                                (input_orient>0 ^ output_orient>0) ? "" : " -a",
                                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);
#ifdef getc_unlocked                            /* avoid lock/unlock overhead */
                flockfile(ofp);
#endif
        } 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, lobe_lim);
                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);
                        else {
                            if (assignD) {
                                varset("Dx", '=', -iovec[3]);
                                varset("Dy", '=', -iovec[4]);
                                varset("Dz", '=', -iovec[5]);
                                ++eclock;
                            }
                            bsdf = funvalue(funame, 6, iovec);
#if (NSSAMP > 0)
                            if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
                                int     ssi;
                                double  ssa[4], ssvec[6], sum = 0;
                                                /* super-sample voxel */
                                for (ssi = NSSAMP; ssi--; ) {
                                    SDmultiSamp(ssa, 4, (ssi+frandom()) *
                                                        (1./NSSAMP));
                                    SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
                                                1.-(iy+ssa[1])/sqres);
                                    ssvec[2] = input_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", '=', -ssvec[3]);
                                        varset("Dy", '=', -ssvec[4]);
                                        varset("Dz", '=', -ssvec[5]);
                                        ++eclock;
                                    }
                                    sum += funvalue(funame, 6, ssvec);
                                }
                                bsdf = sum/NSSAMP;
                            }
#endif
                        }
                        if (pctcull >= 0)
                                fwrite(&bsdf, sizeof(bsdf), 1, ofp);
                        else
                                printf("\t%.3e\n", bsdf);
                        last_bsdf = bsdf;
                    }
                }
                if (rbf != NULL)
                        free(rbf);
                prog_show((ix*sqres+iy+1.)/(sqres*sqres));
            }
        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();
        prog_done();
}

/* 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;
                case 'l':
                        lobe_lim = atoi(argv[++i]);
                        break;
                case 'p':
                        do_prog = atoi(argv[i]+2);
                        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");
                        goto userr;
                }
                ++eclock;
                xml_prologue(argc, argv);       /* start XML output */
                if (dofwd) {
                        input_orient = -1;
                        output_orient = -1;
                        prog_start("Evaluating outside reflectance");
                        (*evf)(argv[i]);
                        output_orient = 1;
                        prog_start("Evaluating outside->inside transmission");
                        (*evf)(argv[i]);
                }
                if (dobwd) {
                        input_orient = 1;
                        output_orient = 1;
                        prog_start("Evaluating inside reflectance");
                        (*evf)(argv[i]);
                        output_orient = -1;
                        prog_start("Evaluating inside->outside transmission");
                        (*evf)(argv[i]);
                }
                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 */
                        char    pbuf[256];
                        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);
                        sprintf(pbuf, "Interpolating component '%s'", argv[i]);
                        prog_start(pbuf);
                        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 */
        prog_start("Interpolating from standard input");
        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][-l maxlobes] [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:	2.33
Committed:	Tue Feb 2 18:08:32 2016 UTC (8 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.32:	+70 -1 lines
Log Message:	Fixing premature and accidental check-in
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.32	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.31 2016/01/29 16:21:55 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	greg	2.23	#include "random.h"
15	greg	2.1	#include "platform.h"
16	greg	2.22	#include "rtprocess.h"
17	greg	2.11	#include "calcomp.h"
18	greg	2.1	#include "bsdfrep.h"
19			/* global argv[0] */
20			char *progname;
21			/* percentage to cull (<0 to turn off) */
22	greg	2.31	static double pctcull = 90.;
23	greg	2.1	/* sampling order */
24	greg	2.31	static int samp_order = 6;
25	greg	2.15	/* super-sampling threshold */
26			const double ssamp_thresh = 0.35;
27			/* number of super-samples */
28	greg	2.28	#ifndef NSSAMP
29			#define NSSAMP 100
30			#endif
31	greg	2.18	/* limit on number of RBF lobes */
32			static int lobe_lim = 15000;
33	greg	2.26	/* progress bar length */
34			static int do_prog = 79;
35
36
37			/* Start new progress bar */
38			#define prog_start(s) if (do_prog) fprintf(stderr, "%s: %s...\n", progname, s); else
39
40			/* Draw progress bar of the appropriate length */
41			static void
42			prog_show(double frac)
43			{
44	greg	2.30	static unsigned call_cnt = 0;
45			static char lastc[] = "-\\\|/";
46			char pbar[256];
47			int nchars;
48	greg	2.26
49	greg	2.30	if (do_prog <= 1) return;
50	greg	2.26	if (do_prog > sizeof(pbar)-2)
51			do_prog = sizeof(pbar)-2;
52			if (frac < 0) frac = 0;
53	greg	2.30	else if (frac >= 1) frac = .9999;
54			nchars = do_prog*frac;
55	greg	2.26	pbar[0] = '\r';
56			memset(pbar+1, '*', nchars);
57	greg	2.30	pbar[nchars+1] = lastc[call_cnt++ & 3];
58			memset(pbar+2+nchars, '-', do_prog-nchars-1);
59	greg	2.26	pbar[do_prog+1] = '\0';
60			fputs(pbar, stderr);
61			}
62
63			/* Finish progress bar */
64	greg	2.27	static void
65			prog_done(void)
66			{
67			int n = do_prog;
68
69			if (n <= 1) return;
70			fputc('\r', stderr);
71			while (n--)
72			fputc(' ', stderr);
73			fputc('\r', stderr);
74			}
75	greg	2.1
76	greg	2.33	/* Output XML prologue to stdout */
77			static void
78			xml_prologue(int ac, char *av[])
79			{
80			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
81			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\">");
82			fputs("<!-- File produced by:", stdout);
83			while (ac-- > 0) {
84			fputc(' ', stdout);
85			fputs(*av++, stdout);
86			}
87			puts(" -->");
88			puts("<WindowElementType>System</WindowElementType>");
89			puts("<FileType>BSDF</FileType>");
90			puts("<Optical>");
91			puts("<Layer>");
92			puts("\t<Material>");
93			printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
94			printf("\t\t<Manufacturer>%s</Manufacturer>\n",
95			bsdf_manuf[0] ? bsdf_manuf : "Unknown");
96			puts("\t\t<DeviceType>Other</DeviceType>");
97			puts("\t</Material>");
98			puts("\t<DataDefinition>");
99			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
100			single_plane_incident ? '3' : '4');
101			puts("\t</DataDefinition>");
102			}
103
104			/* Output XML data prologue to stdout */
105			static void
106			data_prologue()
107			{
108			static const char *bsdf_type[4] = {
109			"Reflection Front",
110			"Transmission Front",
111			"Transmission Back",
112			"Reflection Back"
113			};
114
115			puts("\t<WavelengthData>");
116			puts("\t\t<LayerNumber>System</LayerNumber>");
117			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
118			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
119			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
120			puts("\t\t<WavelengthDataBlock>");
121			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
122			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
123			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
124			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
125			puts("\t\t\t<ScatteringData>");
126			}
127
128			/* Output XML data epilogue to stdout */
129			static void
130			data_epilogue(void)
131			{
132			puts("\t\t\t</ScatteringData>");
133			puts("\t\t</WavelengthDataBlock>");
134			puts("\t</WavelengthData>");
135			}
136
137			/* Output XML epilogue to stdout */
138			static void
139			xml_epilogue(void)
140			{
141			puts("</Layer>");
142			puts("</Optical>");
143			puts("</WindowElement>");
144			}
145
146	greg	2.15	/* Compute absolute relative difference */
147			static double
148			abs_diff(double v1, double v0)
149			{
150			if ((v0 < 0) \| (v1 < 0))
151			return(.0);
152			v1 = (v1-v0)*2./(v0+v1+.0001);
153			if (v1 < 0)
154			return(-v1);
155			return(v1);
156			}
157
158	greg	2.1	/* Interpolate and output isotropic BSDF data */
159			static void
160	greg	2.11	eval_isotropic(char *funame)
161	greg	2.1	{
162			const int sqres = 1<<samp_order;
163			FILE *ofp = NULL;
164	greg	2.17	int assignD = 0;
165	greg	2.1	char cmd[128];
166			int ix, ox, oy;
167	greg	2.11	double iovec[6];
168	greg	2.4	float bsdf;
169	greg	2.15
170	greg	2.11	data_prologue(); /* begin output */
171			if (pctcull >= 0) {
172	greg	2.20	sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
173	greg	2.1	pctcull, samp_order);
174			fflush(stdout);
175			ofp = popen(cmd, "w");
176			if (ofp == NULL) {
177			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
178			progname);
179			exit(1);
180			}
181			SET_FILE_BINARY(ofp);
182	greg	2.25	#ifdef getc_unlocked /* avoid lock/unlock overhead */
183			flockfile(ofp);
184			#endif
185	greg	2.1	} else
186			fputs("{\n", stdout);
187	greg	2.17	/* need to assign Dx, Dy, Dz? */
188			if (funame != NULL)
189			assignD = (fundefined(funame) < 6);
190	greg	2.1	/* run through directions */
191			for (ix = 0; ix < sqres/2; ix++) {
192	greg	2.11	RBFNODE *rbf = NULL;
193	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
194	greg	2.11	iovec[1] = .0;
195			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
196			if (funame == NULL)
197	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
198	greg	2.15	for (ox = 0; ox < sqres; ox++) {
199			float last_bsdf = -1;
200	greg	2.1	for (oy = 0; oy < sqres; oy++) {
201	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
202			iovec[5] = output_orient *
203			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
204			if (funame == NULL)
205	greg	2.29	bsdf = eval_rbfrep(rbf, iovec+3);
206	greg	2.15	else {
207	greg	2.17	if (assignD) {
208			varset("Dx", '=', -iovec[3]);
209			varset("Dy", '=', -iovec[4]);
210			varset("Dz", '=', -iovec[5]);
211			++eclock;
212			}
213	greg	2.15	bsdf = funvalue(funame, 6, iovec);
214	greg	2.28	#if (NSSAMP > 0)
215	greg	2.15	if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
216	greg	2.28	int ssi;
217			double ssa[3], ssvec[6], sum = 0;
218			/* super-sample voxel */
219			for (ssi = NSSAMP; ssi--; ) {
220			SDmultiSamp(ssa, 3, (ssi+frandom()) *
221			(1./NSSAMP));
222	greg	2.15	ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
223			ssvec[1] = .0;
224			ssvec[2] = input_orient *
225			sqrt(1. - ssvec[0]*ssvec[0]);
226			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
227			(oy+ssa[2])/sqres);
228			ssvec[5] = output_orient *
229			sqrt(1. - ssvec[3]*ssvec[3] -
230			ssvec[4]*ssvec[4]);
231	greg	2.17	if (assignD) {
232	greg	2.28	varset("Dx", '=', -ssvec[3]);
233			varset("Dy", '=', -ssvec[4]);
234			varset("Dz", '=', -ssvec[5]);
235	greg	2.17	++eclock;
236			}
237	greg	2.16	sum += funvalue(funame, 6, ssvec);
238	greg	2.15	}
239	greg	2.28	bsdf = sum/NSSAMP;
240	greg	2.15	}
241	greg	2.28	#endif
242	greg	2.15	}
243	greg	2.1	if (pctcull >= 0)
244			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
245			else
246			printf("\t%.3e\n", bsdf);
247	greg	2.15	last_bsdf = bsdf;
248	greg	2.1	}
249	greg	2.15	}
250	greg	2.3	if (rbf != NULL)
251			free(rbf);
252	greg	2.26	prog_show((ix+1.)*(2./sqres));
253	greg	2.1	}
254			if (pctcull >= 0) { /* finish output */
255			if (pclose(ofp)) {
256			fprintf(stderr, "%s: error running '%s'\n",
257			progname, cmd);
258			exit(1);
259			}
260			} else {
261			for (ix = sqressqressqres/2; ix--; )
262			fputs("\t0\n", stdout);
263			fputs("}\n", stdout);
264			}
265	greg	2.11	data_epilogue();
266	greg	2.26	prog_done();
267	greg	2.1	}
268
269			/* Interpolate and output anisotropic BSDF data */
270			static void
271	greg	2.11	eval_anisotropic(char *funame)
272	greg	2.1	{
273			const int sqres = 1<<samp_order;
274			FILE *ofp = NULL;
275	greg	2.17	int assignD = 0;
276	greg	2.1	char cmd[128];
277			int ix, iy, ox, oy;
278	greg	2.11	double iovec[6];
279	greg	2.4	float bsdf;
280	greg	2.15
281	greg	2.11	data_prologue(); /* begin output */
282			if (pctcull >= 0) {
283	greg	2.19	sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
284			(input_orient>0 ^ output_orient>0) ? "" : " -a",
285	greg	2.1	pctcull, samp_order);
286			fflush(stdout);
287			ofp = popen(cmd, "w");
288			if (ofp == NULL) {
289			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
290			progname);
291			exit(1);
292			}
293	greg	2.25	SET_FILE_BINARY(ofp);
294			#ifdef getc_unlocked /* avoid lock/unlock overhead */
295			flockfile(ofp);
296			#endif
297	greg	2.1	} else
298			fputs("{\n", stdout);
299	greg	2.17	/* need to assign Dx, Dy, Dz? */
300			if (funame != NULL)
301			assignD = (fundefined(funame) < 6);
302	greg	2.1	/* run through directions */
303			for (ix = 0; ix < sqres; ix++)
304			for (iy = 0; iy < sqres; iy++) {
305	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
306	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
307	greg	2.11	iovec[2] = input_orient *
308			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
309			if (funame == NULL)
310	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
311	greg	2.15	for (ox = 0; ox < sqres; ox++) {
312			float last_bsdf = -1;
313	greg	2.1	for (oy = 0; oy < sqres; oy++) {
314	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
315			iovec[5] = output_orient *
316			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
317			if (funame == NULL)
318	greg	2.29	bsdf = eval_rbfrep(rbf, iovec+3);
319	greg	2.15	else {
320	greg	2.17	if (assignD) {
321			varset("Dx", '=', -iovec[3]);
322			varset("Dy", '=', -iovec[4]);
323			varset("Dz", '=', -iovec[5]);
324			++eclock;
325			}
326	greg	2.15	bsdf = funvalue(funame, 6, iovec);
327	greg	2.28	#if (NSSAMP > 0)
328	greg	2.15	if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
329	greg	2.28	int ssi;
330			double ssa[4], ssvec[6], sum = 0;
331			/* super-sample voxel */
332			for (ssi = NSSAMP; ssi--; ) {
333			SDmultiSamp(ssa, 4, (ssi+frandom()) *
334			(1./NSSAMP));
335	greg	2.15	SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
336			1.-(iy+ssa[1])/sqres);
337	greg	2.28	ssvec[2] = input_orient *
338	greg	2.15	sqrt(1. - ssvec[0]*ssvec[0] -
339			ssvec[1]*ssvec[1]);
340			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
341			(oy+ssa[3])/sqres);
342			ssvec[5] = output_orient *
343			sqrt(1. - ssvec[3]*ssvec[3] -
344			ssvec[4]*ssvec[4]);
345	greg	2.17	if (assignD) {
346	greg	2.28	varset("Dx", '=', -ssvec[3]);
347			varset("Dy", '=', -ssvec[4]);
348			varset("Dz", '=', -ssvec[5]);
349	greg	2.17	++eclock;
350			}
351	greg	2.16	sum += funvalue(funame, 6, ssvec);
352	greg	2.15	}
353	greg	2.28	bsdf = sum/NSSAMP;
354	greg	2.15	}
355	greg	2.28	#endif
356	greg	2.15	}
357	greg	2.1	if (pctcull >= 0)
358			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
359			else
360			printf("\t%.3e\n", bsdf);
361	greg	2.15	last_bsdf = bsdf;
362	greg	2.1	}
363	greg	2.15	}
364	greg	2.3	if (rbf != NULL)
365			free(rbf);
366	greg	2.26	prog_show((ixsqres+iy+1.)/(sqressqres));
367	greg	2.1	}
368			if (pctcull >= 0) { /* finish output */
369			if (pclose(ofp)) {
370			fprintf(stderr, "%s: error running '%s'\n",
371			progname, cmd);
372			exit(1);
373			}
374			} else
375			fputs("}\n", stdout);
376	greg	2.11	data_epilogue();
377	greg	2.26	prog_done();
378	greg	2.5	}
379
380	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
381			int
382			main(int argc, char *argv[])
383			{
384	greg	2.11	int dofwd = 0, dobwd = 1;
385			int i, na;
386	greg	2.1
387	greg	2.5	progname = argv[0];
388	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
389			esupport &= ~(E_INCHAN\|E_OUTCHAN);
390			scompile("PI:3.14159265358979323846", NULL, 0);
391			biggerlib();
392			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
393			switch (argv[i][1]) { /* get options */
394			case 'e':
395			scompile(argv[++i], NULL, 0);
396			break;
397			case 'f':
398			if (!argv[i][2])
399			fcompile(argv[++i]);
400			else
401			dofwd = (argv[i][0] == '+');
402			break;
403			case 'b':
404			dobwd = (argv[i][0] == '+');
405			break;
406	greg	2.1	case 't':
407	greg	2.11	switch (argv[i][2]) {
408			case '3':
409	greg	2.13	single_plane_incident = 1;
410	greg	2.11	break;
411			case '4':
412	greg	2.13	single_plane_incident = 0;
413	greg	2.11	break;
414			case '\0':
415			pctcull = atof(argv[++i]);
416			break;
417			default:
418			goto userr;
419			}
420	greg	2.1	break;
421			case 'g':
422	greg	2.5	samp_order = atoi(argv[++i]);
423	greg	2.1	break;
424	greg	2.18	case 'l':
425			lobe_lim = atoi(argv[++i]);
426			break;
427	greg	2.26	case 'p':
428			do_prog = atoi(argv[i]+2);
429			break;
430	greg	2.1	default:
431			goto userr;
432			}
433	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
434			void (evf)(char s) = single_plane_incident ?
435			&eval_isotropic : &eval_anisotropic;
436	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
437	greg	2.12	fprintf(stderr,
438			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
439			progname);
440	greg	2.24	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n");
441	greg	2.11	goto userr;
442	greg	2.12	}
443	greg	2.17	++eclock;
444	greg	2.11	xml_prologue(argc, argv); /* start XML output */
445			if (dofwd) {
446			input_orient = -1;
447			output_orient = -1;
448	greg	2.26	prog_start("Evaluating outside reflectance");
449			(*evf)(argv[i]);
450	greg	2.11	output_orient = 1;
451	greg	2.26	prog_start("Evaluating outside->inside transmission");
452			(*evf)(argv[i]);
453	greg	2.11	}
454			if (dobwd) {
455			input_orient = 1;
456			output_orient = 1;
457	greg	2.26	prog_start("Evaluating inside reflectance");
458			(*evf)(argv[i]);
459	greg	2.11	output_orient = -1;
460	greg	2.26	prog_start("Evaluating inside->outside transmission");
461			(*evf)(argv[i]);
462	greg	2.11	}
463			xml_epilogue(); /* finish XML output & exit */
464			return(0);
465			}
466			if (i < argc) { /* open input files if given */
467	greg	2.12	int nbsdf = 0;
468	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
469	greg	2.26	char pbuf[256];
470	greg	2.11	FILE *fpin = fopen(argv[i], "rb");
471			if (fpin == NULL) {
472			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
473			progname, argv[i]);
474			return(1);
475			}
476			if (!load_bsdf_rep(fpin))
477			return(1);
478			fclose(fpin);
479	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
480			xml_prologue(argc, argv);
481	greg	2.26	sprintf(pbuf, "Interpolating component '%s'", argv[i]);
482			prog_start(pbuf);
483	greg	2.11	if (single_plane_incident)
484			eval_isotropic(NULL);
485			else
486			eval_anisotropic(NULL);
487			}
488			xml_epilogue(); /* finish XML output & exit */
489			return(0);
490			}
491			SET_FILE_BINARY(stdin); /* load from stdin */
492			if (!load_bsdf_rep(stdin))
493	greg	2.1	return(1);
494	greg	2.5	xml_prologue(argc, argv); /* start XML output */
495	greg	2.26	prog_start("Interpolating from standard input");
496	greg	2.1	if (single_plane_incident) /* resample dist. */
497	greg	2.11	eval_isotropic(NULL);
498	greg	2.1	else
499	greg	2.11	eval_anisotropic(NULL);
500			xml_epilogue(); /* finish XML output & exit */
501	greg	2.1	return(0);
502			userr:
503			fprintf(stderr,
504	greg	2.18	"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
505	greg	2.11	progname);
506			fprintf(stderr,
507			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
508	greg	2.1	progname);
509			return(1);
510			}