src/cv/bsdf2ttree.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.21 2013/11/09 05:47:49 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 "rtprocess.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;
                                /* limit on number of RBF lobes */
static int              lobe_lim = 15000;

/* 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);
        } 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) *
                                                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%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);
                }
        } 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) *
                                                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;
                case 'l':
                        lobe_lim = 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][-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:	2.22
Committed:	Tue Nov 26 17:33:55 2013 UTC (10 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.21:	+2 -1 lines
Log Message:	Added missing include file needed by Windows
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.22	static const char RCSid[] = "$Id: bsdf2ttree.c,v 2.21 2013/11/09 05:47:49 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	2.22	#include "rtprocess.h"
16	greg	2.11	#include "calcomp.h"
17	greg	2.1	#include "bsdfrep.h"
18			/* global argv[0] */
19			char *progname;
20			/* percentage to cull (<0 to turn off) */
21	greg	2.7	double pctcull = 90.;
22	greg	2.1	/* sampling order */
23			int samp_order = 6;
24	greg	2.15	/* super-sampling threshold */
25			const double ssamp_thresh = 0.35;
26			/* number of super-samples */
27			const int nssamp = 100;
28	greg	2.18	/* limit on number of RBF lobes */
29			static int lobe_lim = 15000;
30	greg	2.1
31	greg	2.11	/* Output XML prologue to stdout */
32			static void
33			xml_prologue(int ac, char *av[])
34			{
35			puts("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
36			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\">");
37			fputs("<!-- File produced by:", stdout);
38			while (ac-- > 0) {
39			fputc(' ', stdout);
40			fputs(*av++, stdout);
41			}
42			puts(" -->");
43			puts("<WindowElementType>System</WindowElementType>");
44			puts("<FileType>BSDF</FileType>");
45			puts("<Optical>");
46			puts("<Layer>");
47			puts("\t<Material>");
48	greg	2.21	printf("\t\t<Name>%s</Name>\n", bsdf_name[0] ? bsdf_name : "Unknown");
49			printf("\t\t<Manufacturer>%s</Manufacturer>\n",
50			bsdf_manuf[0] ? bsdf_manuf : "Unknown");
51	greg	2.11	puts("\t\t<DeviceType>Other</DeviceType>");
52			puts("\t</Material>");
53			puts("\t<DataDefinition>");
54			printf("\t\t<IncidentDataStructure>TensorTree%c</IncidentDataStructure>\n",
55			single_plane_incident ? '3' : '4');
56			puts("\t</DataDefinition>");
57			}
58
59			/* Output XML data prologue to stdout */
60			static void
61			data_prologue()
62			{
63			static const char *bsdf_type[4] = {
64			"Reflection Front",
65			"Transmission Front",
66			"Transmission Back",
67			"Reflection Back"
68			};
69
70			puts("\t<WavelengthData>");
71			puts("\t\t<LayerNumber>System</LayerNumber>");
72			puts("\t\t<Wavelength unit=\"Integral\">Visible</Wavelength>");
73			puts("\t\t<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum>");
74			puts("\t\t<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum>");
75			puts("\t\t<WavelengthDataBlock>");
76			printf("\t\t\t<WavelengthDataDirection>%s</WavelengthDataDirection>\n",
77			bsdf_type[(input_orient>0)<<1 \| (output_orient>0)]);
78			puts("\t\t\t<AngleBasis>LBNL/Shirley-Chiu</AngleBasis>");
79			puts("\t\t\t<ScatteringDataType>BTDF</ScatteringDataType>");
80			puts("\t\t\t<ScatteringData>");
81			}
82
83			/* Output XML data epilogue to stdout */
84			static void
85			data_epilogue(void)
86			{
87			puts("\t\t\t</ScatteringData>");
88			puts("\t\t</WavelengthDataBlock>");
89			puts("\t</WavelengthData>");
90			}
91
92			/* Output XML epilogue to stdout */
93			static void
94			xml_epilogue(void)
95			{
96			puts("</Layer>");
97			puts("</Optical>");
98			puts("</WindowElement>");
99			}
100
101	greg	2.15	/* Compute absolute relative difference */
102			static double
103			abs_diff(double v1, double v0)
104			{
105			if ((v0 < 0) \| (v1 < 0))
106			return(.0);
107			v1 = (v1-v0)*2./(v0+v1+.0001);
108			if (v1 < 0)
109			return(-v1);
110			return(v1);
111			}
112
113	greg	2.1	/* Interpolate and output isotropic BSDF data */
114			static void
115	greg	2.11	eval_isotropic(char *funame)
116	greg	2.1	{
117			const int sqres = 1<<samp_order;
118			FILE *ofp = NULL;
119	greg	2.17	int assignD = 0;
120	greg	2.1	char cmd[128];
121			int ix, ox, oy;
122	greg	2.11	double iovec[6];
123	greg	2.4	float bsdf;
124	greg	2.15
125	greg	2.11	data_prologue(); /* begin output */
126			if (pctcull >= 0) {
127	greg	2.20	sprintf(cmd, "rttree_reduce -a -h -ff -r 3 -t %f -g %d",
128	greg	2.1	pctcull, samp_order);
129			fflush(stdout);
130			ofp = popen(cmd, "w");
131			if (ofp == NULL) {
132			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
133			progname);
134			exit(1);
135			}
136			SET_FILE_BINARY(ofp);
137			} else
138			fputs("{\n", stdout);
139	greg	2.17	/* need to assign Dx, Dy, Dz? */
140			if (funame != NULL)
141			assignD = (fundefined(funame) < 6);
142	greg	2.1	/* run through directions */
143			for (ix = 0; ix < sqres/2; ix++) {
144	greg	2.11	RBFNODE *rbf = NULL;
145	greg	2.14	iovec[0] = 2.*(ix+.5)/sqres - 1.;
146	greg	2.11	iovec[1] = .0;
147			iovec[2] = input_orient * sqrt(1. - iovec[0]*iovec[0]);
148			if (funame == NULL)
149	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
150	greg	2.15	for (ox = 0; ox < sqres; ox++) {
151			float last_bsdf = -1;
152	greg	2.1	for (oy = 0; oy < sqres; oy++) {
153	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
154			iovec[5] = output_orient *
155			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
156			if (funame == NULL)
157	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
158	greg	2.11	output_orient/iovec[5];
159	greg	2.15	else {
160	greg	2.16	double ssa[3], ssvec[6], sum;
161	greg	2.15	int ssi;
162	greg	2.17	if (assignD) {
163			varset("Dx", '=', -iovec[3]);
164			varset("Dy", '=', -iovec[4]);
165			varset("Dz", '=', -iovec[5]);
166			++eclock;
167			}
168	greg	2.15	bsdf = funvalue(funame, 6, iovec);
169			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
170	greg	2.16	sum = 0; /* super-sample voxel */
171	greg	2.15	for (ssi = nssamp; ssi--; ) {
172			SDmultiSamp(ssa, 3, (ssi+drand48())/nssamp);
173			ssvec[0] = 2.*(ix+ssa[0])/sqres - 1.;
174			ssvec[1] = .0;
175			ssvec[2] = input_orient *
176			sqrt(1. - ssvec[0]*ssvec[0]);
177			SDsquare2disk(ssvec+3, (ox+ssa[1])/sqres,
178			(oy+ssa[2])/sqres);
179			ssvec[5] = output_orient *
180			sqrt(1. - ssvec[3]*ssvec[3] -
181			ssvec[4]*ssvec[4]);
182	greg	2.17	if (assignD) {
183			varset("Dx", '=', -iovec[3]);
184			varset("Dy", '=', -iovec[4]);
185			varset("Dz", '=', -iovec[5]);
186			++eclock;
187			}
188	greg	2.16	sum += funvalue(funame, 6, ssvec);
189	greg	2.15	}
190	greg	2.16	bsdf = sum/nssamp;
191	greg	2.15	}
192			}
193	greg	2.1	if (pctcull >= 0)
194			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
195			else
196			printf("\t%.3e\n", bsdf);
197	greg	2.15	last_bsdf = bsdf;
198	greg	2.1	}
199	greg	2.15	}
200	greg	2.3	if (rbf != NULL)
201			free(rbf);
202	greg	2.1	}
203			if (pctcull >= 0) { /* finish output */
204			if (pclose(ofp)) {
205			fprintf(stderr, "%s: error running '%s'\n",
206			progname, cmd);
207			exit(1);
208			}
209			} else {
210			for (ix = sqressqressqres/2; ix--; )
211			fputs("\t0\n", stdout);
212			fputs("}\n", stdout);
213			}
214	greg	2.11	data_epilogue();
215	greg	2.1	}
216
217			/* Interpolate and output anisotropic BSDF data */
218			static void
219	greg	2.11	eval_anisotropic(char *funame)
220	greg	2.1	{
221			const int sqres = 1<<samp_order;
222			FILE *ofp = NULL;
223	greg	2.17	int assignD = 0;
224	greg	2.1	char cmd[128];
225			int ix, iy, ox, oy;
226	greg	2.11	double iovec[6];
227	greg	2.4	float bsdf;
228	greg	2.15
229	greg	2.11	data_prologue(); /* begin output */
230			if (pctcull >= 0) {
231	greg	2.19	sprintf(cmd, "rttree_reduce%s -h -ff -r 4 -t %f -g %d",
232			(input_orient>0 ^ output_orient>0) ? "" : " -a",
233	greg	2.1	pctcull, samp_order);
234			fflush(stdout);
235			ofp = popen(cmd, "w");
236			if (ofp == NULL) {
237			fprintf(stderr, "%s: cannot create pipe to rttree_reduce\n",
238			progname);
239			exit(1);
240			}
241			} else
242			fputs("{\n", stdout);
243	greg	2.17	/* need to assign Dx, Dy, Dz? */
244			if (funame != NULL)
245			assignD = (fundefined(funame) < 6);
246	greg	2.1	/* run through directions */
247			for (ix = 0; ix < sqres; ix++)
248			for (iy = 0; iy < sqres; iy++) {
249	greg	2.11	RBFNODE rbf = NULL; / Klems reversal */
250	greg	2.15	SDsquare2disk(iovec, 1.-(ix+.5)/sqres, 1.-(iy+.5)/sqres);
251	greg	2.11	iovec[2] = input_orient *
252			sqrt(1. - iovec[0]iovec[0] - iovec[1]iovec[1]);
253			if (funame == NULL)
254	greg	2.18	rbf = advect_rbf(iovec, lobe_lim);
255	greg	2.15	for (ox = 0; ox < sqres; ox++) {
256			float last_bsdf = -1;
257	greg	2.1	for (oy = 0; oy < sqres; oy++) {
258	greg	2.11	SDsquare2disk(iovec+3, (ox+.5)/sqres, (oy+.5)/sqres);
259			iovec[5] = output_orient *
260			sqrt(1. - iovec[3]iovec[3] - iovec[4]iovec[4]);
261			if (funame == NULL)
262	greg	2.15	bsdf = eval_rbfrep(rbf, iovec+3) *
263	greg	2.11	output_orient/iovec[5];
264	greg	2.15	else {
265	greg	2.16	double ssa[4], ssvec[6], sum;
266	greg	2.15	int ssi;
267	greg	2.17	if (assignD) {
268			varset("Dx", '=', -iovec[3]);
269			varset("Dy", '=', -iovec[4]);
270			varset("Dz", '=', -iovec[5]);
271			++eclock;
272			}
273	greg	2.15	bsdf = funvalue(funame, 6, iovec);
274			if (abs_diff(bsdf, last_bsdf) > ssamp_thresh) {
275	greg	2.16	sum = 0; /* super-sample voxel */
276	greg	2.15	for (ssi = nssamp; ssi--; ) {
277			SDmultiSamp(ssa, 4, (ssi+drand48())/nssamp);
278			SDsquare2disk(ssvec, 1.-(ix+ssa[0])/sqres,
279			1.-(iy+ssa[1])/sqres);
280			ssvec[2] = output_orient *
281			sqrt(1. - ssvec[0]*ssvec[0] -
282			ssvec[1]*ssvec[1]);
283			SDsquare2disk(ssvec+3, (ox+ssa[2])/sqres,
284			(oy+ssa[3])/sqres);
285			ssvec[5] = output_orient *
286			sqrt(1. - ssvec[3]*ssvec[3] -
287			ssvec[4]*ssvec[4]);
288	greg	2.17	if (assignD) {
289			varset("Dx", '=', -iovec[3]);
290			varset("Dy", '=', -iovec[4]);
291			varset("Dz", '=', -iovec[5]);
292			++eclock;
293			}
294	greg	2.16	sum += funvalue(funame, 6, ssvec);
295	greg	2.15	}
296	greg	2.16	bsdf = sum/nssamp;
297	greg	2.15	}
298			}
299	greg	2.1	if (pctcull >= 0)
300			fwrite(&bsdf, sizeof(bsdf), 1, ofp);
301			else
302			printf("\t%.3e\n", bsdf);
303	greg	2.15	last_bsdf = bsdf;
304	greg	2.1	}
305	greg	2.15	}
306	greg	2.3	if (rbf != NULL)
307			free(rbf);
308	greg	2.1	}
309			if (pctcull >= 0) { /* finish output */
310			if (pclose(ofp)) {
311			fprintf(stderr, "%s: error running '%s'\n",
312			progname, cmd);
313			exit(1);
314			}
315			} else
316			fputs("}\n", stdout);
317	greg	2.11	data_epilogue();
318	greg	2.5	}
319
320	greg	2.1	/* Read in BSDF and interpolate as tensor tree representation */
321			int
322			main(int argc, char *argv[])
323			{
324	greg	2.11	int dofwd = 0, dobwd = 1;
325			int i, na;
326	greg	2.1
327	greg	2.5	progname = argv[0];
328	greg	2.11	esupport \|= E_VARIABLE\|E_FUNCTION\|E_RCONST;
329			esupport &= ~(E_INCHAN\|E_OUTCHAN);
330			scompile("PI:3.14159265358979323846", NULL, 0);
331			biggerlib();
332			for (i = 1; i < argc-1 && (argv[i][0] == '-') \| (argv[i][0] == '+'); i++)
333			switch (argv[i][1]) { /* get options */
334			case 'e':
335			scompile(argv[++i], NULL, 0);
336			break;
337			case 'f':
338			if (!argv[i][2])
339			fcompile(argv[++i]);
340			else
341			dofwd = (argv[i][0] == '+');
342			break;
343			case 'b':
344			dobwd = (argv[i][0] == '+');
345			break;
346	greg	2.1	case 't':
347	greg	2.11	switch (argv[i][2]) {
348			case '3':
349	greg	2.13	single_plane_incident = 1;
350	greg	2.11	break;
351			case '4':
352	greg	2.13	single_plane_incident = 0;
353	greg	2.11	break;
354			case '\0':
355			pctcull = atof(argv[++i]);
356			break;
357			default:
358			goto userr;
359			}
360	greg	2.1	break;
361			case 'g':
362	greg	2.5	samp_order = atoi(argv[++i]);
363	greg	2.1	break;
364	greg	2.18	case 'l':
365			lobe_lim = atoi(argv[++i]);
366			break;
367	greg	2.1	default:
368			goto userr;
369			}
370	greg	2.11	if (single_plane_incident >= 0) { /* function-based BSDF? */
371			void (evf)(char s) = single_plane_incident ?
372			&eval_isotropic : &eval_anisotropic;
373	greg	2.17	if (i != argc-1 \|\| fundefined(argv[i]) < 3) {
374	greg	2.12	fprintf(stderr,
375			"%s: need single function with 6 arguments: bsdf(ix,iy,iz,ox,oy,oz)\n",
376			progname);
377	greg	2.17	fprintf(stderr, "\tor 3 arguments using Dx,Dy,Dz: bsdf(ix,iy,iz)\n",
378			progname);
379	greg	2.11	goto userr;
380	greg	2.12	}
381	greg	2.17	++eclock;
382	greg	2.11	xml_prologue(argc, argv); /* start XML output */
383			if (dofwd) {
384			input_orient = -1;
385			output_orient = -1;
386			(evf)(argv[i]); / outside reflectance */
387			output_orient = 1;
388			(evf)(argv[i]); / outside -> inside */
389			}
390			if (dobwd) {
391			input_orient = 1;
392			output_orient = 1;
393			(evf)(argv[i]); / inside reflectance */
394			output_orient = -1;
395			(evf)(argv[i]); / inside -> outside */
396			}
397			xml_epilogue(); /* finish XML output & exit */
398			return(0);
399			}
400			if (i < argc) { /* open input files if given */
401	greg	2.12	int nbsdf = 0;
402	greg	2.11	for ( ; i < argc; i++) { /* interpolate each component */
403			FILE *fpin = fopen(argv[i], "rb");
404			if (fpin == NULL) {
405			fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
406			progname, argv[i]);
407			return(1);
408			}
409			if (!load_bsdf_rep(fpin))
410			return(1);
411			fclose(fpin);
412	greg	2.12	if (!nbsdf++) /* start XML on first dist. */
413			xml_prologue(argc, argv);
414	greg	2.11	if (single_plane_incident)
415			eval_isotropic(NULL);
416			else
417			eval_anisotropic(NULL);
418			}
419			xml_epilogue(); /* finish XML output & exit */
420			return(0);
421			}
422			SET_FILE_BINARY(stdin); /* load from stdin */
423			if (!load_bsdf_rep(stdin))
424	greg	2.1	return(1);
425	greg	2.5	xml_prologue(argc, argv); /* start XML output */
426	greg	2.1	if (single_plane_incident) /* resample dist. */
427	greg	2.11	eval_isotropic(NULL);
428	greg	2.1	else
429	greg	2.11	eval_anisotropic(NULL);
430			xml_epilogue(); /* finish XML output & exit */
431	greg	2.1	return(0);
432			userr:
433			fprintf(stderr,
434	greg	2.18	"Usage: %s [-g Nlog2][-t pctcull][-l maxlobes] [bsdf.sir ..] > bsdf.xml\n",
435	greg	2.11	progname);
436			fprintf(stderr,
437			" or: %s -t{3\|4} [-g Nlog2][-t pctcull][{+\|-}for[ward]][{+\|-}b[ackward]][-e expr][-f file] bsdf_func > bsdf.xml\n",
438	greg	2.1	progname);
439			return(1);
440			}