src/cv/bsdf2rad.c

#ifndef lint
static const char RCSid[] = "$Id: bsdf2rad.c,v 2.38 2021/03/27 17:50:18 greg Exp $";
#endif
/*
 *  Plot 3-D BSDF output based on scattering interpolant or XML representation
 */

#include <stdlib.h>
#include "rtio.h"
#include "paths.h"
#include "rtmath.h"
#include "bsdfrep.h"

#ifndef NINCIDENT
#define NINCIDENT       37              /* number of samples/hemisphere */
#endif
#ifndef GRIDSTEP
#define GRIDSTEP        2               /* our grid step size */
#endif
#define SAMPRES         (GRIDRES/GRIDSTEP)

int     front_comp = 0;                 /* front component flags (SDsamp*) */
int     back_comp = 0;                  /* back component flags */
double  overall_min = 1./PI;            /* overall minimum BSDF value */
double  min_log10;                      /* smallest log10 value for plotting */
double  overall_max = .0;               /* overall maximum BSDF value */

char    ourTempDir[TEMPLEN+1] = "";     /* our temporary directory */

const char      frpref[] = "rf";
const char      ftpref[] = "tf";
const char      brpref[] = "rb";
const char      btpref[] = "tb";
const char      dsuffix[] = ".txt";

const char      sph_fmat[] = "fBSDFmat";
const char      sph_bmat[] = "bBSDFmat";
const double    sph_rad = 10.;
const double    sph_xoffset = 15.;

#define bsdf_rad        (sph_rad*.25)
#define arrow_rad       (bsdf_rad*.015)

#define set_minlog()    overall_min = (overall_min < 1e-5) ? 1e-5 : overall_min; \
                                min_log10 = log10(overall_min) - .1

char    *progname;

/* Get Fibonacci sphere vector (0 to NINCIDENT-1) */
static RREAL *
get_ivector(FVECT iv, int i)
{
        const double    phistep = PI*(3. - 2.236067978);
        double          r;

        iv[2] = 1. - (i+.5)*(1./NINCIDENT);
        r = sqrt(1. - iv[2]*iv[2]);
        iv[0] = r * cos((i+1.)*phistep);
        iv[1] = r * sin((i+1.)*phistep);

        return(iv);
}

/* Convert incident vector into sphere position */
static RREAL *
cvt_sposition(FVECT sp, const FVECT iv, int inc_side)
{
        sp[0] = -iv[0]*sph_rad + inc_side*sph_xoffset;
        sp[1] = -iv[1]*sph_rad;
        sp[2] = iv[2]*sph_rad;

        return(sp);
}

/* Get temporary file name */
static char *
tfile_name(const char *prefix, const char *suffix, int i)
{
        static char     buf[256];

        if (!ourTempDir[0]) {           /* create temporary directory */
                mktemp(strcpy(ourTempDir,TEMPLATE));
                if (mkdir(ourTempDir, 0777) < 0) {
                        perror("mkdir");
                        exit(1);
                }
        }
        if (!prefix) prefix = "T";
        if (!suffix) suffix = "";
        sprintf(buf, "%s/%s%03d%s", ourTempDir, prefix, i, suffix);
        return(buf);
}

/* Remove temporary directory & contents */
static void
cleanup_tmp(void)
{
        char    buf[128];

        if (!ourTempDir[0])
                return;
#if defined(_WIN32) || defined(_WIN64)
        sprintf(buf, "RMDIR %s /S /Q", ourTempDir);
#else
        sprintf(buf, "rm -rf %s", ourTempDir);
#endif
        system(buf);
}

/* Run the specified command, returning 1 if OK */
static int
run_cmd(const char *cmd)
{
        fflush(stdout);
        if (system(cmd)) {
                fprintf(stderr, "%s: error running: %s\n", progname, cmd);
                return(0);
        }
        return(1);
}

/* Plot surface points for the given BSDF incident angle */
static int
plotBSDF(const char *fname, const FVECT ivec, int dfl, const SDData *sd)
{
        FILE            *fp = fopen(fname, "w");
        int             i, j;

        if (fp == NULL) {
                fprintf(stderr, "%s: cannot open '%s' for writing\n",
                                progname, fname);
                return(0);
        }
        if (ivec[2] > 0) {
                input_orient = 1;
                output_orient = dfl&SDsampR ? 1 : -1;
        } else {
                input_orient = -1;
                output_orient = dfl&SDsampR ? -1 : 1;
        }
        for (i = SAMPRES; i--; )
            for (j = 0; j < SAMPRES; j++) {
                FVECT   ovec;
                SDValue sval;
                double  bsdf;
                ovec_from_pos(ovec, i*GRIDSTEP, j*GRIDSTEP);
                if (SDreportError(SDevalBSDF(&sval, ivec,
                                                ovec, sd), stderr))
                        return(0);
                if (sval.cieY > overall_max)
                        overall_max = sval.cieY;
                bsdf = (sval.cieY < overall_min) ? overall_min : sval.cieY;
                bsdf = log10(bsdf) - min_log10;
                fprintf(fp, "%.5f %.5f %.5f\n",
                                ovec[0]*bsdf, ovec[1]*bsdf, ovec[2]*bsdf);
            }
        if (fclose(fp) == EOF) {
                fprintf(stderr, "%s: error writing data to '%s'\n",
                                progname, fname);
                return(0);
        }
        return(1);
}

/* Build BSDF values from loaded XML file */
static int
build_wBSDF(const SDData *sd)
{
        FVECT   ivec;
        int     i;

        if (front_comp & SDsampR)
                for (i = 0; i < NINCIDENT; i++) {
                        get_ivector(ivec, i);
                        if (!plotBSDF(tfile_name(frpref, dsuffix, i),
                                        ivec, SDsampR, sd))
                                return(0);
                }
        if (front_comp & SDsampT)
                for (i = 0; i < NINCIDENT; i++) {
                        get_ivector(ivec, i);
                        if (!plotBSDF(tfile_name(ftpref, dsuffix, i),
                                        ivec, SDsampT, sd))
                                return(0);
                }
        if (back_comp & SDsampR)
                for (i = 0; i < NINCIDENT; i++) {
                        get_ivector(ivec, i);
                        ivec[0] = -ivec[0]; ivec[2] = -ivec[2];
                        if (!plotBSDF(tfile_name(brpref, dsuffix, i),
                                        ivec, SDsampR, sd))
                                return(0);
                }
        if (back_comp & SDsampT)
                for (i = 0; i < NINCIDENT; i++) {
                        get_ivector(ivec, i);
                        ivec[0] = -ivec[0]; ivec[2] = -ivec[2];
                        if (!plotBSDF(tfile_name(btpref, dsuffix, i),
                                        ivec, SDsampT, sd))
                                return(0);
                }
        return(1);
}

/* Plot surface points using radial basis function */
static int
plotRBF(const char *fname, const RBFNODE *rbf)
{
        FILE            *fp = fopen(fname, "w");
        int             i, j;

        if (fp == NULL) {
                fprintf(stderr, "%s: cannot open '%s' for writing\n",
                                progname, fname);
                return(0);
        }
        for (i = SAMPRES; i--; )
            for (j = 0; j < SAMPRES; j++) {
                FVECT   ovec;
                double  bsdf;
                ovec_from_pos(ovec, i*GRIDSTEP, j*GRIDSTEP);
                bsdf = eval_rbfrep(rbf, ovec);
                if (bsdf > overall_max)
                        overall_max = bsdf;
                else if (bsdf < overall_min)
                        bsdf = overall_min;
                bsdf = log10(bsdf) - min_log10;
                fprintf(fp, "%.5f %.5f %.5f\n",
                                ovec[0]*bsdf, ovec[1]*bsdf, ovec[2]*bsdf);
            }
        if (fclose(fp) == EOF) {
                fprintf(stderr, "%s: error writing data to '%s'\n",
                                progname, fname);
                return(0);
        }
        return(1);
}

/* Build BSDF values from scattering interpolant representation */
static int
build_wRBF(void)
{
        const char      *pref;
        int             i;

        if (input_orient > 0) {
                if (output_orient > 0)
                        pref = frpref;
                else
                        pref = ftpref;
        } else if (output_orient < 0)
                pref = brpref;
        else
                pref = btpref;

        for (i = 0; i < NINCIDENT; i++) {
                FVECT   ivec;
                RBFNODE *rbf;
                get_ivector(ivec, i);
                if (input_orient < 0) {
                        ivec[0] = -ivec[0]; ivec[2] = -ivec[2];
                }
                rbf = advect_rbf(ivec, 15000);
                if (!plotRBF(tfile_name(pref, dsuffix, i), rbf))
                        return(0);
                if (rbf) free(rbf);
        }
        return(1);                              /* next call frees */
}

/* Put out mirror arrow for the given incident vector */
static void
put_mirror_arrow(const FVECT origin, const FVECT nrm)
{
        const double    arrow_len = 1.2*bsdf_rad;
        const double    tip_len = 0.2*bsdf_rad;
        static int      cnt = 1;
        FVECT           refl;
        int             i;

        refl[0] = 2.*nrm[2]*nrm[0];
        refl[1] = 2.*nrm[2]*nrm[1];
        refl[2] = 2.*nrm[2]*nrm[2] - 1.;

        printf("\n# Mirror arrow #%d\n", cnt);
        printf("\nshaft_mat cylinder inc_dir%d\n0\n0\n7", cnt);
        printf("\n\t%f %f %f\n\t%f %f %f\n\t%f\n",
                        origin[0], origin[1], origin[2]+arrow_len,
                        origin[0], origin[1], origin[2],
                        arrow_rad);
        printf("\nshaft_mat cylinder mir_dir%d\n0\n0\n7", cnt);
        printf("\n\t%f %f %f\n\t%f %f %f\n\t%f\n",
                        origin[0], origin[1], origin[2],
                        origin[0] + arrow_len*refl[0],
                        origin[1] + arrow_len*refl[1],
                        origin[2] + arrow_len*refl[2],
                        arrow_rad);
        printf("\ntip_mat cone mir_tip%d\n0\n0\n8", cnt);
        printf("\n\t%f %f %f\n\t%f %f %f\n\t%f 0\n",
                        origin[0] + (arrow_len-.5*tip_len)*refl[0],
                        origin[1] + (arrow_len-.5*tip_len)*refl[1],
                        origin[2] + (arrow_len-.5*tip_len)*refl[2],
                        origin[0] + (arrow_len+.5*tip_len)*refl[0],
                        origin[1] + (arrow_len+.5*tip_len)*refl[1],
                        origin[2] + (arrow_len+.5*tip_len)*refl[2],
                        2.*arrow_rad);
        ++cnt;
}

/* Put out transmitted direction arrow for the given incident vector */
static void
put_trans_arrow(const FVECT origin)
{
        const double    arrow_len = 1.2*bsdf_rad;
        const double    tip_len = 0.2*bsdf_rad;
        static int      cnt = 1;
        int             i;

        printf("\n# Transmission arrow #%d\n", cnt);
        printf("\nshaft_mat cylinder trans_dir%d\n0\n0\n7", cnt);
        printf("\n\t%f %f %f\n\t%f %f %f\n\t%f\n",
                        origin[0], origin[1], origin[2],
                        origin[0], origin[1], origin[2]-arrow_len,
                        arrow_rad);
        printf("\ntip_mat cone trans_tip%d\n0\n0\n8", cnt);
        printf("\n\t%f %f %f\n\t%f %f %f\n\t%f 0\n",
                        origin[0], origin[1], origin[2]-arrow_len+.5*tip_len,
                        origin[0], origin[1], origin[2]-arrow_len-.5*tip_len,
                        2.*arrow_rad);
        ++cnt;
}

/* Compute rotation (x,y,z) => (xp,yp,zp) */
static int
addrot(char *xf, const FVECT xp, const FVECT yp, const FVECT zp)
{
        int     n = 0;
        double  theta;

        if (yp[2]*yp[2] + zp[2]*zp[2] < 2.*FTINY*FTINY) {
                /* Special case for X' along Z-axis */
                theta = -atan2(yp[0], yp[1]);
                sprintf(xf, " -ry %f -rz %f",
                                xp[2] < 0.0 ? 90.0 : -90.0,
                                theta*(180./PI));
                return(4);
        }
        theta = atan2(yp[2], zp[2]);
        if (!FABSEQ(theta,0.0)) {
                sprintf(xf, " -rx %f", theta*(180./PI));
                while (*xf) ++xf;
                n += 2;
        }
        theta = Asin(-xp[2]);
        if (!FABSEQ(theta,0.0)) {
                sprintf(xf, " -ry %f", theta*(180./PI));
                while (*xf) ++xf;
                n += 2;
        }
        theta = atan2(xp[1], xp[0]);
        if (!FABSEQ(theta,0.0)) {
                sprintf(xf, " -rz %f", theta*(180./PI));
                /* while (*xf) ++xf; */
                n += 2;
        }
        return(n);
}

/* Put out BSDF surfaces */
static int
put_BSDFs(void)
{
        const double    scalef = bsdf_rad/(log10(overall_max) - min_log10);
        FVECT           ivec, sorg, nrm, upv;
        RREAL           vMtx[3][3];
        char            *fname;
        char            cmdbuf[256];
        char            rotargs[64];
        int             nrota;
        int             i;

        printf("\n# Gensurf output corresponding to %d incident directions\n",
                        NINCIDENT);

        printf("\nvoid glow tip_mat\n0\n0\n4 1 0 1 0\n");
        printf("\nvoid mixfunc shaft_mat\n4 tip_mat void 0.25 .\n0\n0\n");

        for (i = 0; i < NINCIDENT; i++) {
                get_ivector(ivec, i);
                nrm[0] = -ivec[0]; nrm[1] = -ivec[1]; nrm[2] = ivec[2];
                upv[0] = nrm[0]*nrm[1]*(nrm[2] - 1.);
                upv[1] = nrm[0]*nrm[0] + nrm[1]*nrm[1]*nrm[2];
                upv[2] = -nrm[1]*(nrm[0]*nrm[0] + nrm[1]*nrm[1]);
                if (SDcompXform(vMtx, nrm, upv) != SDEnone)
                        continue;
                nrota = addrot(rotargs, vMtx[0], vMtx[1], vMtx[2]);
                if (front_comp) {
                        cvt_sposition(sorg, ivec, 1);
                        printf("\nvoid colorfunc scale_pat\n");
                        printf("10 bsdf_red bsdf_grn bsdf_blu bsdf2rad.cal\n");
                        printf("\t-s %f -t %f %f %f\n0\n0\n",
                                        bsdf_rad, sorg[0], sorg[1], sorg[2]);
                        printf("\nscale_pat glow scale_mat\n0\n0\n4 1 1 1 0\n");
                }
                if (front_comp & SDsampR) {
                        put_mirror_arrow(sorg, nrm);
                        fname = tfile_name(frpref, dsuffix, i);
                        sprintf(cmdbuf,
                "gensurf scale_mat %s%d %s %s %s %d %d | xform %s -s %f -t %f %f %f",
                                        frpref, i, fname, fname, fname, SAMPRES-1, SAMPRES-1,
                                        rotargs, scalef, sorg[0], sorg[1], sorg[2]);
                        if (!run_cmd(cmdbuf))
                                return(0);
                }
                if (front_comp & SDsampT) {
                        put_trans_arrow(sorg);
                        fname = tfile_name(ftpref, dsuffix, i);
                        sprintf(cmdbuf,
                "gensurf scale_mat %s%d %s %s %s %d %d | xform -I %s -s %f -t %f %f %f",
                                        ftpref, i, fname, fname, fname, SAMPRES-1, SAMPRES-1,
                                        rotargs, scalef, sorg[0], sorg[1], sorg[2]);
                        if (!run_cmd(cmdbuf))
                                return(0);
                }
                if (back_comp) {
                        cvt_sposition(sorg, ivec, -1);
                        printf("\nvoid colorfunc scale_pat\n");
                        printf("10 bsdf_red bsdf_grn bsdf_blu bsdf2rad.cal\n");
                        printf("\t-s %f -t %f %f %f\n0\n0\n",
                                        bsdf_rad, sorg[0], sorg[1], sorg[2]);
                        printf("\nscale_pat glow scale_mat\n0\n0\n4 1 1 1 0\n");
                }
                if (back_comp & SDsampR) {
                        put_mirror_arrow(sorg, nrm);
                        fname = tfile_name(brpref, dsuffix, i);
                        sprintf(cmdbuf,
                "gensurf scale_mat %s%d %s %s %s %d %d | xform -I -ry 180 %s -s %f -t %f %f %f",
                                        brpref, i, fname, fname, fname, SAMPRES-1, SAMPRES-1,
                                        rotargs, scalef, sorg[0], sorg[1], sorg[2]);
                        if (!run_cmd(cmdbuf))
                                return(0);
                }
                if (back_comp & SDsampT) {
                        put_trans_arrow(sorg);
                        fname = tfile_name(btpref, dsuffix, i);
                        sprintf(cmdbuf,
                "gensurf scale_mat %s%d %s %s %s %d %d | xform -ry 180 %s -s %f -t %f %f %f",
                                        btpref, i, fname, fname, fname, SAMPRES-1, SAMPRES-1,
                                        rotargs, scalef, sorg[0], sorg[1], sorg[2]);
                        if (!run_cmd(cmdbuf))
                                return(0);
                }
        }
        return(1);
}

/* Put our hemisphere material */
static void
put_matBSDF(const char *XMLfile)
{
        const char      *curdir = "./";

        if (!XMLfile) {                 /* simple material */
                printf("\n# Simplified material because we have no XML input\n");
                printf("\nvoid brightfunc latlong\n2 latlong bsdf2rad.cal\n0\n0\n");
                if ((front_comp|back_comp) & SDsampT)
                        printf("\nlatlong trans %s\n0\n0\n7 .75 .75 .75 0 .04 .5 .8\n",
                                        sph_fmat);
                else
                        printf("\nlatlong plastic %s\n0\n0\n5 .5 .5 .5 0 0\n",
                                        sph_fmat);
                printf("\ninherit alias %s %s\n", sph_bmat, sph_fmat);
                return;
        }
        switch (XMLfile[0]) {           /* avoid RAYPATH search */
        case '.':
        case '~':
        CASEDIRSEP:
                curdir = "";
                break;
        case '\0':
                fprintf(stderr, "%s: empty file name in put_matBSDF\n", progname);
                exit(1);
                break;
        }
        printf("\n# Actual BSDF materials for rendering the hemispheres\n");
        printf("\nvoid BSDF BSDF_f\n6 0 \"%s%s\" upx upy upz bsdf2rad.cal\n0\n0\n",
                        curdir, XMLfile);
        printf("\nvoid plastic black\n0\n0\n5 0 0 0 0 0\n");
        printf("\nvoid mixfunc %s\n4 BSDF_f black latlong bsdf2rad.cal\n0\n0\n",
                        sph_fmat);
        printf("\nvoid BSDF BSDF_b\n8 0 \"%s%s\" upx upy upz bsdf2rad.cal -ry 180\n0\n0\n",
                        curdir, XMLfile);
        printf("\nvoid mixfunc %s\n4 BSDF_b black latlong bsdf2rad.cal\n0\n0\n",
                        sph_bmat);
}

/* Put out overhead parallel light source */
static void
put_source(void)
{
        printf("\n# Overhead parallel light source\n");
        printf("\nvoid light bright\n0\n0\n3 2500 2500 2500\n");
        printf("\nbright source light\n0\n0\n4 0 0 1 2\n");
        printf("\n# Material used for labels\n");
        printf("\nvoid trans vellum\n0\n0\n7 1 1 1 0 0 .5 0\n");
}

/* Put out hemisphere(s) */
static void
put_hemispheres(void)
{
        const int       nsegs = 131;

        printf("\n# Hemisphere(s) for showing BSDF appearance (if XML file)\n");
        if (front_comp) {
                printf(
"\n!genrev %s Front \"R*sin(A*t)\" \"R*cos(A*t)\" %d -e \"R:%g;A:%f\" -s | xform -t %g 0 0\n",
                                sph_fmat, nsegs, sph_rad, 0.5*PI, sph_xoffset);
                printf("\nvoid brighttext front_text\n3 helvet.fnt . FRONT\n0\n");
                printf("12\n\t%f %f 0\n\t%f 0 0\n\t0 %f 0\n\t.01 1 -.1\n",
                                -.22*sph_rad + sph_xoffset, -1.4*sph_rad,
                                .35/5.*sph_rad, -1.6*.35/5.*sph_rad);
                printf("\nfront_text alias front_label_mat vellum\n");
                printf("\nfront_label_mat polygon front_label\n0\n0\n12");
                printf("\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n",
                                -.25*sph_rad + sph_xoffset, -1.3*sph_rad,
                                -.25*sph_rad + sph_xoffset, (-1.4-1.6*.35/5.-.1)*sph_rad,
                                .25*sph_rad + sph_xoffset, (-1.4-1.6*.35/5.-.1)*sph_rad,
                                .25*sph_rad + sph_xoffset, -1.3*sph_rad );
        }
        if (back_comp) {
                printf(
"\n!genrev %s Back \"R*cos(A*t)\" \"R*sin(A*t)\" %d -e \"R:%g;A:%f\" -s | xform -t %g 0 0\n",
                                sph_bmat, nsegs, sph_rad, 0.5*PI, -sph_xoffset);
                printf("\nvoid brighttext back_text\n3 helvet.fnt . BACK\n0\n");
                printf("12\n\t%f %f 0\n\t%f 0 0\n\t0 %f 0\n\t.01 1 -.1\n",
                                -.22*sph_rad - sph_xoffset, -1.4*sph_rad,
                                .35/4.*sph_rad, -1.6*.35/4.*sph_rad);
                printf("\nback_text alias back_label_mat vellum\n");
                printf("\nback_label_mat polygon back_label\n0\n0\n12");
                printf("\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n",
                                -.25*sph_rad - sph_xoffset, -1.3*sph_rad,
                                -.25*sph_rad - sph_xoffset, (-1.4-1.6*.35/4.-.1)*sph_rad,
                                .25*sph_rad - sph_xoffset, (-1.4-1.6*.35/4.-.1)*sph_rad,
                                .25*sph_rad - sph_xoffset, -1.3*sph_rad );
        }
}

/* Put out falsecolor scale and name label */
static void
put_scale(void)
{
        const double    max_log10 = log10(overall_max);
        const double    leg_width = 2.*.75*(fabs(sph_xoffset) - sph_rad);
        const double    leg_height = 2.*sph_rad;
        const int       text_lines = 6;
        const int       text_digits = 8;
        char            fmt[16];
        int             i;

        printf("\n# BSDF legend with falsecolor scale\n");
        printf("\nvoid colorfunc lscale\n10 sca_red(Py) sca_grn(Py) sca_blu(Py)");
        printf("\n\tbsdf2rad.cal -s %f -t 0 %f 0\n0\n0\n", leg_height, -.5*leg_height);
        sprintf(fmt, "%%.%df", text_digits-3);
        for (i = 0; i < text_lines; i++) {
                char    vbuf[16];
                sprintf(vbuf, fmt, pow(10., (i+.5)/text_lines*(max_log10-min_log10)+min_log10));
                printf("\nlscale brighttext lscale\n");
                printf("3 helvet.fnt . %s\n0\n12\n", vbuf);
                printf("\t%f %f 0\n", -.45*leg_width, ((i+.9)/text_lines-.5)*leg_height);
                printf("\t%f 0 0\n", .8*leg_width/strlen(vbuf));
                printf("\t0 %f 0\n", -.9/text_lines*leg_height);
                printf("\t.01 1 -.1\n");
        }
        printf("\nlscale alias legend_mat vellum\n");
        printf("\nlegend_mat polygon legend\n0\n0\n12");
        printf("\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n",
                        -.5*leg_width, .5*leg_height,
                        -.5*leg_width, -.5*leg_height,
                        .5*leg_width, -.5*leg_height,
                        .5*leg_width, .5*leg_height);
        printf("\nvoid brighttext BSDFtitle\n3 helvet.fnt . BSDF\n0\n12\n");
        printf("\t%f %f 0\n", -.25*leg_width, .7*leg_height);
        printf("\t%f 0 0\n", .4/4.*leg_width);
        printf("\t0 %f 0\n", -.1*leg_height);
        printf("\t.01 1 -.1\n");
        printf("\nBSDFtitle alias title_mat vellum\n");
        printf("\ntitle_mat polygon title\n0\n0\n12");
        printf("\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n",
                        -.3*leg_width, .75*leg_height,
                        -.3*leg_width, .55*leg_height,
                        .3*leg_width, .55*leg_height,
                        .3*leg_width, .75*leg_height);
        if (!bsdf_name[0])
                return;
        printf("\nvoid brighttext BSDFname\n3 helvet.fnt . \"%s\"\n0\n12\n", bsdf_name);
        printf("\t%f %f 0\n", -.95*leg_width, -.6*leg_height);
        printf("\t%f 0 0\n", 1.8/strlen(bsdf_name)*leg_width);
        printf("\t0 %f 0\n", -.1*leg_height);
        printf("\t.01 1 -.1\n");
        printf("\nBSDFname alias name_mat vellum\n");
        printf("\nname_mat polygon name\n0\n0\n12");
        printf("\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n\t%f %f 0\n",
                        -leg_width, -.55*leg_height,
                        -leg_width, -.75*leg_height,
                        leg_width, -.75*leg_height,
                        leg_width, -.55*leg_height);
}

/* Convert MGF to Radiance in output */
static void
convert_mgf(const char *mgfdata)
{
        int     len = strlen(mgfdata);
        char    mgfn[128];
        char    radfn[128];
        char    cmdbuf[256];
        float   xmin, xmax, ymin, ymax, zmin, zmax;
        double  max_dim;
        int     fd;
        FILE    *fp;

        if (!len) return;
        strcpy(mgfn, tfile_name("geom", ".mgf", 0));
        fd = open(mgfn, O_WRONLY|O_CREAT, 0666);
        if (fd < 0 || write(fd, mgfdata, len) != len) {
                fprintf(stderr, "%s: cannot write file '%s'\n",
                                progname, mgfn);
                return;
        }
        close(fd);
        strcpy(radfn, tfile_name("geom", ".rad", 0));
        sprintf(cmdbuf, "mgf2rad %s > %s", mgfn, radfn);
        if (!run_cmd(cmdbuf))
                return;
        sprintf(cmdbuf, "getbbox -w -h %s", radfn);
        if ((fp = popen(cmdbuf, "r")) == NULL ||
                        fscanf(fp, "%f %f %f %f %f %f",
                                &xmin, &xmax, &ymin, &ymax, &zmin, &zmax) != 6
                        || pclose(fp) < 0) {
                fprintf(stderr, "%s: error reading from command: %s\n",
                                progname, cmdbuf);
                return;
        }
        max_dim = ymax - ymin;
        if (xmax - xmin > max_dim)
                max_dim = xmax - xmin;
        if (front_comp) {
                printf("\n# BSDF system geometry (front view)\n");
                sprintf(cmdbuf, "xform -t %f %f %f -s %f -t %f %f 0 %s",
                                -.5*(xmin+xmax), -.5*(ymin+ymax), -zmax,
                                1.5*sph_rad/max_dim,
                                sph_xoffset, -2.5*sph_rad,
                                radfn);
                if (!run_cmd(cmdbuf))
                        return;
        }
        if (back_comp) {
                printf("\n# BSDF system geometry (back view)\n");
                sprintf(cmdbuf, "xform -t %f %f %f -s %f -ry 180 -t %f %f 0 %s",
                                -.5*(xmin+xmax), -.5*(ymin+ymax), -zmin,
                                1.5*sph_rad/max_dim,
                                -sph_xoffset, -2.5*sph_rad,
                                radfn);
                if (!run_cmd(cmdbuf))
                        return;
        }
}

/* Check RBF input header line & get minimum BSDF value */
static int
rbf_headline(char *s, void *p)
{
        char    fmt[MAXFMTLEN];

        if (formatval(fmt, s)) {
                if (strcmp(fmt, BSDFREP_FMT))
                        return(-1);
                return(0);
        }
        if (!strncmp(s, "IO_SIDES=", 9)) {
                sscanf(s+9, "%d %d", &input_orient, &output_orient);
                if (input_orient == output_orient) {
                        if (input_orient > 0)
                                front_comp |= SDsampR;
                        else
                                back_comp |= SDsampR;
                } else if (input_orient > 0)
                        front_comp |= SDsampT;
                else
                        back_comp |= SDsampT;
                return(0);
        }
        if (!strncmp(s, "BSDFMIN=", 8)) {
                sscanf(s+8, "%lf", &bsdf_min);
                if (bsdf_min < overall_min)
                        overall_min = bsdf_min;
                return(0);
        }
        return(0);
}

/* Produce a Radiance model plotting the given BSDF representation */
int
main(int argc, char *argv[])
{
        int     inpXML = -1;
        double  myLim[2];
        SDData  myBSDF;
        int     a, n;
                                                /* check arguments */
        progname = argv[0];
        a = 1;
        myLim[0] = -1; myLim[1] = -2;           /* specified BSDF range? */
        if (argc > a+3 && argv[a][0] == '-' && argv[a][1] == 'r') {
                myLim[0] = atof(argv[++a]);
                myLim[1] = atof(argv[++a]);
                ++a;
        }
        if (argc > a && (n = strlen(argv[a])-4) > 0) {
                if (!strcasecmp(argv[a]+n, ".xml"))
                        inpXML = 1;
                else if (!strcasecmp(argv[a]+n, ".sir"))
                        inpXML = 0;
        }
        if (inpXML < 0 || inpXML & (argc > a+1)) {
                fprintf(stderr, "Usage: %s [-r min max] bsdf.xml > output.rad\n", progname);
                fprintf(stderr, "   Or: %s [-r min max] hemi1.sir hemi2.sir .. > output.rad\n", progname);
                return(1);
        }
        fputs("# ", stdout);                    /* copy our command */
        printargs(argc, argv, stdout);
                                                /* evaluate BSDF */
        if (inpXML) {
                SDclearBSDF(&myBSDF, argv[a]);
                if (SDreportError(SDloadFile(&myBSDF, argv[a]), stderr))
                        return(1);
                if (myBSDF.rf != NULL) front_comp |= SDsampR;
                if (myBSDF.tf != NULL) front_comp |= SDsampT;
                if (myBSDF.rb != NULL) back_comp |= SDsampR;
                if (myBSDF.tb != NULL) back_comp |= SDsampT;
                if (!front_comp & !back_comp) {
                        fprintf(stderr, "%s: nothing to plot in '%s'\n",
                                        progname, argv[a]);
                        return(1);
                }
                if (myLim[0] >= 0)
                        overall_min = myLim[0];
                else {
                        if (front_comp & SDsampR && myBSDF.rLambFront.cieY < overall_min*PI)
                                overall_min = myBSDF.rLambFront.cieY/PI;
                        if (back_comp & SDsampR && myBSDF.rLambBack.cieY < overall_min*PI)
                                overall_min = myBSDF.rLambBack.cieY/PI;
                        if (front_comp & SDsampT && myBSDF.tLambFront.cieY < overall_min*PI)
                                overall_min = myBSDF.tLambFront.cieY/PI;
                        if (back_comp & SDsampT && myBSDF.tLambBack.cieY < overall_min*PI)
                                overall_min = myBSDF.tLambBack.cieY/PI;
                }
                set_minlog();
                if (!build_wBSDF(&myBSDF))
                        return(1);
                if (myBSDF.matn[0])
                        strcpy(bsdf_name, myBSDF.matn);
                else
                        strcpy(bsdf_name, myBSDF.name);
                strcpy(bsdf_manuf, myBSDF.makr);
                put_matBSDF(argv[a]);
        } else {
                FILE    *fp[4];
                if (argc > a+4) {
                        fprintf(stderr, "%s: more than 4 hemispheres!\n", progname);
                        return(1);
                }
                for (n = a; n < argc; n++) {
                        fp[n-a] = fopen(argv[n], "rb");
                        if (fp[n-a] == NULL) {
                                fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
                                                progname, argv[n]);
                                return(1);
                        }
                        if (getheader(fp[n-a], rbf_headline, NULL) < 0) {
                                fprintf(stderr, "%s: bad BSDF interpolant '%s'\n",
                                                progname, argv[n]);
                                return(1);
                        }
                }
                if (myLim[0] >= 0)
                        overall_min = myLim[0];
                set_minlog();
                for (n = a; n < argc; n++) {
                        if (fseek(fp[n-a], 0L, SEEK_SET) < 0) {
                                fprintf(stderr, "%s: cannot seek on '%s'\n",
                                                progname, argv[n]);
                                return(1);
                        }
                        if (!load_bsdf_rep(fp[n-a]))
                                return(1);
                        fclose(fp[n-a]);
                        if (!build_wRBF())
                                return(1);
                }
                put_matBSDF(NULL);
        }
        if (myLim[1] > myLim[0])        /* override maximum BSDF? */
                overall_max = myLim[1];
        put_source();                   /* before hemispheres & labels */
        put_hemispheres();
        put_scale();
        if (inpXML && myBSDF.mgf)
                convert_mgf(myBSDF.mgf);
        if (!put_BSDFs())               /* most of the output happens here */
                return(1);
        cleanup_tmp();
        return(0);
}
Revision:	2.39
Committed:	Tue Dec 7 23:55:02 2021 UTC (2 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R4, HEAD
Changes since 2.38:	+3 -3 lines
Log Message:	fix: Repaired issue with reciprocity and BSDF sampling, thanks to Jon Sargent