src/util/rad.c

/* Copyright (c) 1994 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 * Executive program for oconv, rpict and pfilt
 */

#include "standard.h"
#include "paths.h"
#include <ctype.h>
#include <sys/types.h>


typedef struct {
        char    *name;          /* variable name */
        short   nick;           /* # characters required for nickname */
        short   nass;           /* # assignments made */
        char    *value;         /* assigned value(s) */
        int     (*fixval)();    /* assignment checking function */
} VARIABLE;

int     onevalue(), catvalues(), boolvalue(),
        qualvalue(), fltvalue(), intvalue();

                                /* variables */
#define OBJECT          0               /* object files */
#define SCENE           1               /* scene files */
#define MATERIAL        2               /* material files */
#define ILLUM           3               /* mkillum input files */
#define MKILLUM         4               /* mkillum options */
#define RENDER          5               /* rendering options */
#define OCONV           6               /* oconv options */
#define PFILT           7               /* pfilt options */
#define VIEW            8               /* view(s) for picture(s) */
#define ZONE            9               /* simulation zone */
#define QUALITY         10              /* desired rendering quality */
#define OCTREE          11              /* octree file name */
#define PICTURE         12              /* picture file name */
#define AMBFILE         13              /* ambient file name */
#define OPTFILE         14              /* rendering options file */
#define EXPOSURE        15              /* picture exposure setting */
#define RESOLUTION      16              /* maximum picture resolution */
#define UP              17              /* view up (X, Y or Z) */
#define INDIRECT        18              /* indirection in lighting */
#define DETAIL          19              /* level of scene detail */
#define PENUMBRAS       20              /* shadow penumbras are desired */
#define VARIABILITY     21              /* level of light variability */
#define REPORT          22              /* report frequency and errfile */
#define RAWSAVE         23              /* save raw picture file */
                                /* total number of variables */
#define NVARS           24

VARIABLE        vv[NVARS] = {           /* variable-value pairs */
        {"objects",     3,      0,      NULL,   catvalues},
        {"scene",       3,      0,      NULL,   catvalues},
        {"materials",   3,      0,      NULL,   catvalues},
        {"illum",       3,      0,      NULL,   catvalues},
        {"mkillum",     3,      0,      NULL,   catvalues},
        {"render",      3,      0,      NULL,   catvalues},
        {"oconv",       3,      0,      NULL,   catvalues},
        {"pfilt",       2,      0,      NULL,   catvalues},
        {"view",        2,      0,      NULL,   NULL},
        {"ZONE",        2,      0,      NULL,   onevalue},
        {"QUALITY",     3,      0,      NULL,   qualvalue},
        {"OCTREE",      3,      0,      NULL,   onevalue},
        {"PICTURE",     3,      0,      NULL,   onevalue},
        {"AMBFILE",     3,      0,      NULL,   onevalue},
        {"OPTFILE",     3,      0,      NULL,   onevalue},
        {"EXPOSURE",    3,      0,      NULL,   fltvalue},
        {"RESOLUTION",  3,      0,      NULL,   onevalue},
        {"UP",          2,      0,      NULL,   onevalue},
        {"INDIRECT",    3,      0,      NULL,   intvalue},
        {"DETAIL",      3,      0,      NULL,   qualvalue},
        {"PENUMBRAS",   3,      0,      NULL,   boolvalue},
        {"VARIABILITY", 3,      0,      NULL,   qualvalue},
        {"REPORT",      3,      0,      NULL,   onevalue},
        {"RAWSAVE",     3,      0,      NULL,   boolvalue},
};

VARIABLE        *matchvar();
char    *nvalue();

#define UPPER(c)        ((c)&~0x20)     /* ASCII trick */

#define vnam(vc)        (vv[vc].name)
#define vdef(vc)        (vv[vc].nass)
#define vval(vc)        (vv[vc].value)
#define vint(vc)        atoi(vval(vc))
#define vlet(vc)        UPPER(vval(vc)[0])
#define vscale          vlet
#define vbool(vc)       (vlet(vc)=='T')

#define HIGH            'H'
#define MEDIUM          'M'
#define LOW             'L'

                                /* overture calculation file */
#ifdef NIX
char    overfile[] = "overture.raw";
#else
char    overfile[] = "/dev/null";
#endif

extern time_t   fdate(), time();

time_t  scenedate;              /* date of latest scene or object file */
time_t  octreedate;             /* date of octree */
time_t  matdate;                /* date of latest material file */
time_t  illumdate;              /* date of last illum file */

char    *oct0name;              /* name of pre-mkillum octree */
time_t  oct0date;               /* date of pre-mkillum octree */
char    *oct1name;              /* name of post-mkillum octree */
time_t  oct1date;               /* date of post-mkillum octree (>= matdate) */

int     nowarn = 0;             /* no warnings */
int     explicate = 0;          /* explicate variables */
int     silent = 0;             /* do work silently */
int     touchonly = 0;          /* touch files only */
int     noaction = 0;           /* don't do anything */
int     sayview = 0;            /* print view out */
char    *rvdevice = NULL;       /* rview output device */
char    *viewselect = NULL;     /* specific view only */

int     overture = 0;           /* overture calculation needed */

char    *progname;              /* global argv[0] */
char    *rifname;               /* global rad input file name */

char    radname[MAXPATH];       /* root Radiance file name */


main(argc, argv)
int     argc;
char    *argv[];
{
        char    ropts[512];
        char    popts[64];
        int     i;

        progname = argv[0];
                                /* get options */
        for (i = 1; i < argc && argv[i][0] == '-'; i++)
                switch (argv[i][1]) {
                case 's':
                        silent++;
                        break;
                case 'n':
                        noaction++;
                        break;
                case 't':
                        touchonly++;
                        break;
                case 'e':
                        explicate++;
                        break;
                case 'o':
                        rvdevice = argv[++i];
                        break;
                case 'V':
                        sayview++;
                        break;
                case 'v':
                        viewselect = argv[++i];
                        break;
                case 'w':
                        nowarn++;
                        break;
                default:
                        goto userr;
                }
        if (i >= argc)
                goto userr;
        rifname = argv[i];
                                /* assign Radiance root file name */
        rootname(radname, rifname);
                                /* load variable values */
        load(rifname);
                                /* get any additional assignments */
        for (i++; i < argc; i++)
                setvariable(argv[i]);
                                /* check assignments */
        checkvalues();
                                /* check files and dates */
        checkfiles();
                                /* set default values as necessary */
        setdefaults();
                                /* print all values if requested */
        if (explicate)
                printvals();
                                /* build octree (and run mkillum) */
        oconv();
                                /* check date on ambient file */
        checkambfile();
                                /* run simulation */
        renderopts(ropts, popts);
        xferopts(ropts);
        if (rvdevice != NULL)
                rview(ropts, popts);
        else
                rpict(ropts, popts);
        exit(0);
userr:
        fprintf(stderr,
"Usage: %s [-s][-n][-t][-e][-V][-v view][-o dev] rfile [VAR=value ..]\n",
                        progname);
        exit(1);
}


rootname(rn, fn)                /* remove tail from end of fn */
register char   *rn, *fn;
{
        char    *tp, *dp;

        for (tp = NULL, dp = rn; *rn = *fn++; rn++)
                if (ISDIRSEP(*rn))
                        dp = rn;
                else if (*rn == '.')
                        tp = rn;
        if (tp != NULL && tp > dp)
                *tp = '\0';
}


#define NOCHAR  127             /* constant for character to delete */


load(rfname)                    /* load Radiance simulation file */
char    *rfname;
{
        FILE    *fp;
        char    buf[512];
        register char   *cp;

        if (rfname == NULL)
                fp = stdin;
        else if ((fp = fopen(rfname, "r")) == NULL)
                syserr(rfname);
        while (fgetline(buf, sizeof(buf), fp) != NULL) {
                for (cp = buf; *cp; cp++) {
                        switch (*cp) {
                        case '\\':
                                *cp++ = NOCHAR;
                                continue;
                        case '#':
                                *cp = '\0';
                                break;
                        default:
                                continue;
                        }
                        break;
                }
                setvariable(buf);
        }
        fclose(fp);
}


setvariable(ass)                /* assign variable according to string */
register char   *ass;
{
        char    varname[32];
        int     n;
        register char   *cp;
        register VARIABLE       *vp;
        register int    i;

        while (isspace(*ass))           /* skip leading space */
                ass++;
        cp = varname;                   /* extract name */
        while (cp < varname+sizeof(varname)-1
                        && *ass && !isspace(*ass) && *ass != '=')
                *cp++ = *ass++;
        *cp = '\0';
        if (!varname[0])
                return;         /* no variable name! */
                                        /* trim value */
        while (isspace(*ass) || *ass == '=')
                ass++;
        for (n = strlen(ass); n > 0; n--)
                if (!isspace(ass[n-1]))
                        break;
        if (!n && !nowarn) {
                fprintf(stderr, "%s: warning - missing value for variable '%s'\n",
                                progname, varname);
                return;
        }
                                        /* match variable from list */
        vp = matchvar(varname);
        if (vp == NULL) {
                fprintf(stderr, "%s: unknown variable '%s'\n",
                                progname, varname);
                exit(1);
        }
                                        /* assign new value */
        if (i = vp->nass) {
                cp = vp->value;
                while (i--)
                        while (*cp++)
                                ;
                i = cp - vp->value;
                vp->value = realloc(vp->value, i+n+1);
        } else
                vp->value = malloc(n+1);
        if (vp->value == NULL)
                syserr(progname);
        cp = vp->value+i;               /* copy value, squeezing spaces */
        *cp = *ass;
        for (i = 1; i <= n; i++) {
                if (ass[i] == NOCHAR)
                        continue;
                if (isspace(*cp))
                        while (isspace(ass[i]))
                                i++;
                *++cp = ass[i];
        }
        if (isspace(*cp))               /* remove trailing space */
                *cp = '\0';
        vp->nass++;
}


VARIABLE *
matchvar(nam)                   /* match a variable by its name */
char    *nam;
{
        int     n = strlen(nam);
        register int    i;

        for (i = 0; i < NVARS; i++)
                if (n >= vv[i].nick && !strncmp(nam, vv[i].name, n))
                        return(vv+i);
        return(NULL);
}


char *
nvalue(vp, n)                   /* return nth variable value */
VARIABLE        *vp;
register int    n;
{
        register char   *cp;

        if (vp == NULL | n < 0 | n >= vp->nass)
                return(NULL);
        cp = vp->value;
        while (n--)
                while (*cp++)
                        ;
        return(cp);
}


checkvalues()                   /* check assignments */
{
        register int    i;

        for (i = 0; i < NVARS; i++)
                if (vv[i].fixval != NULL)
                        (*vv[i].fixval)(vv+i);
}


onevalue(vp)                    /* only one assignment for this variable */
register VARIABLE       *vp;
{
        if (vp->nass < 2)
                return;
        if (!nowarn)
                fprintf(stderr,
                "%s: warning - multiple assignment of variable '%s'\n",
                        progname, vp->name);
        do
                vp->value += strlen(vp->value)+1;
        while (--vp->nass > 1);
}


catvalues(vp)                   /* concatenate variable values */
register VARIABLE       *vp;
{
        register char   *cp;

        if (vp->nass < 2)
                return;
        for (cp = vp->value; vp->nass > 1; vp->nass--) {
                while (*cp)
                        cp++;
                *cp++ = ' ';
        }
}


int
badmatch(tv, cv)                /* case insensitive truncated comparison */
register char   *tv, *cv;
{
        if (!*tv) return(1);            /* null string cannot match */
        do
                if (UPPER(*tv) != *cv++)
                        return(1);
        while (*++tv);
        return(0);              /* OK */
}


boolvalue(vp)                   /* check boolean for legal values */
register VARIABLE       *vp;
{
        if (!vp->nass) return;
        onevalue(vp);
        switch (UPPER(vp->value[0])) {
        case 'T':
                if (badmatch(vp->value, "TRUE")) break;
                return;
        case 'F':
                if (badmatch(vp->value, "FALSE")) break;
                return;
        }
        fprintf(stderr, "%s: illegal value for boolean variable '%s'\n",
                        progname, vp->name);
        exit(1);
}


qualvalue(vp)                   /* check qualitative var. for legal values */
register VARIABLE       *vp;
{
        if (!vp->nass) return;
        onevalue(vp);
        switch (UPPER(vp->value[0])) {
        case 'L':
                if (badmatch(vp->value, "LOW")) break;
                return;
        case 'M':
                if (badmatch(vp->value, "MEDIUM")) break;
                return;
        case 'H':
                if (badmatch(vp->value, "HIGH")) break;
                return;
        }
        fprintf(stderr, "%s: illegal value for qualitative variable '%s'\n",
                        progname, vp->name);
        exit(1);
}


intvalue(vp)                    /* check integer variable for legal values */
register VARIABLE       *vp;
{
        if (!vp->nass) return;
        onevalue(vp);
        if (isint(vp->value)) return;
        fprintf(stderr, "%s: illegal value for integer variable '%s'\n",
                        progname, vp->name);
        exit(1);
}


fltvalue(vp)                    /* check float variable for legal values */
register VARIABLE       *vp;
{
        if (!vp->nass) return;
        onevalue(vp);
        if (isflt(vp->value)) return;
        fprintf(stderr, "%s: illegal value for real variable '%s'\n",
                        progname, vp->name);
        exit(1);
}


time_t
checklast(fnames)                       /* check files and find most recent */
register char   *fnames;
{
        char    thisfile[MAXPATH];
        time_t  thisdate, lastdate = 0;
        register char   *cp;

        if (fnames == NULL)
                return(0);
        while (*fnames) {
                while (isspace(*fnames)) fnames++;
                cp = thisfile;
                while (*fnames && !isspace(*fnames))
                        *cp++ = *fnames++;
                *cp = '\0';
                if (!(thisdate = fdate(thisfile)))
                        syserr(thisfile);
                if (thisdate > lastdate)
                        lastdate = thisdate;
        }
        return(lastdate);
}


char *
newfname(orig, pred)            /* create modified file name */
char    *orig;
int     pred;
{
        extern char     *rindex();
        register char   *cp;
        register int    n;
        int     suffix;

        n = 0; cp = orig; suffix = -1;          /* suffix position, length */
        while (*cp) {
                if (*cp == '.') suffix = n;
                else if (ISDIRSEP(*cp)) suffix = -1;
                cp++; n++;
        }
        if (suffix == -1) suffix = n;
        if ((cp = bmalloc(n+2)) == NULL)
                syserr(progname);
        strncpy(cp, orig, suffix);
        cp[suffix] = pred;                      /* root name + pred + suffix */
        strcpy(cp+suffix+1, orig+suffix);
        return(cp);
}


checkfiles()                    /* check for existence and modified times */
{
        time_t  objdate;

        if (!vdef(OCTREE)) {
                if ((vval(OCTREE) = bmalloc(strlen(radname)+5)) == NULL)
                        syserr(progname);
                sprintf(vval(OCTREE), "%s.oct", radname);
                vdef(OCTREE)++;
        }
        octreedate = fdate(vval(OCTREE));
        if (vdef(ILLUM)) {              /* illum requires secondary octrees */
                oct0name = newfname(vval(OCTREE), '0');
                oct1name = newfname(vval(OCTREE), '1');
                oct0date = fdate(oct0name);
                oct1date = fdate(oct1name);
        } else
                oct0name = oct1name = vval(OCTREE);
        if ((scenedate = checklast(vval(SCENE))) &&
                        (objdate = checklast(vval(OBJECT))) > scenedate)
                scenedate = objdate;
        illumdate = checklast(vval(ILLUM));
        if (!octreedate & !scenedate & !illumdate) {
                fprintf(stderr, "%s: need '%s' or '%s' or '%s'\n", progname,
                                vnam(OCTREE), vnam(SCENE), vnam(ILLUM));
                exit(1);
        }
        matdate = checklast(vval(MATERIAL));
}       


getoctcube(org, sizp)           /* get octree bounding cube */
double  org[3], *sizp;
{
        extern FILE     *popen();
        static double   oorg[3], osiz = 0.;
        double  min[3], max[3];
        char    buf[512];
        FILE    *fp;
        register int    i;

        if (osiz <= FTINY)
                if (noaction && fdate(oct1name) <
                                (scenedate>illumdate?scenedate:illumdate)) {
                                                        /* run getbbox */
                        sprintf(buf, "getbbox -w -h %s",
                                vdef(SCENE) ? vval(SCENE) : vval(ILLUM));
                        if ((fp = popen(buf, "r")) == NULL)
                                syserr("getbbox");
                        if (fscanf(fp, "%lf %lf %lf %lf %lf %lf",
                                        &min[0], &max[0], &min[1], &max[1],
                                        &min[2], &max[2]) != 6) {
                                fprintf(stderr,
                        "%s: error reading bounding box from getbbox\n",
                                                progname);
                                exit(1);
                        }
                        for (i = 0; i < 3; i++)
                                if (max[i] - min[i] > osiz)
                                        osiz = max[i] - min[i];
                        for (i = 0; i < 3; i++)
                                oorg[i] = (max[i]+min[i]-osiz)*.5;
                        pclose(fp);
                } else {                                /* from octree */
                        oconv();        /* does nothing if done already */
                        sprintf(buf, "getinfo -d < %s", oct1name);
                        if ((fp = popen(buf, "r")) == NULL)
                                syserr("getinfo");
                        if (fscanf(fp, "%lf %lf %lf %lf", &oorg[0], &oorg[1],
                                        &oorg[2], &osiz) != 4) {
                                fprintf(stderr,
                        "%s: error reading bounding cube from getinfo\n",
                                                progname);
                                exit(1);
                        }
                        pclose(fp);
                }
        org[0] = oorg[0]; org[1] = oorg[1]; org[2] = oorg[2]; *sizp = osiz;
}


setdefaults()                   /* set default values for unassigned var's */
{
        double  org[3], size;
        char    buf[128];

        if (!vdef(ZONE)) {
                getoctcube(org, &size);
                sprintf(buf, "E %g %g %g %g %g %g", org[0], org[0]+size,
                                org[1], org[1]+size, org[2], org[2]+size);
                vval(ZONE) = savqstr(buf);
                vdef(ZONE)++;
        }
        if (!vdef(INDIRECT)) {
                vval(INDIRECT) = "0";
                vdef(INDIRECT)++;
        }
        if (!vdef(QUALITY)) {
                vval(QUALITY) = "L";
                vdef(QUALITY)++;
        }
        if (!vdef(RESOLUTION)) {
                vval(RESOLUTION) = "512";
                vdef(RESOLUTION)++;
        }
        if (!vdef(PICTURE)) {
                vval(PICTURE) = radname;
                vdef(PICTURE)++;
        }
        if (!vdef(VIEW)) {
                vval(VIEW) = "X";
                vdef(VIEW)++;
        }
        if (!vdef(DETAIL)) {
                vval(DETAIL) = "M";
                vdef(DETAIL)++;
        }
        if (!vdef(PENUMBRAS)) {
                vval(PENUMBRAS) = "F";
                vdef(PENUMBRAS)++;
        }
        if (!vdef(VARIABILITY)) {
                vval(VARIABILITY) = "L";
                vdef(VARIABILITY)++;
        }
        if (!vdef(RAWSAVE)) {
                vval(RAWSAVE) = "F";
                vdef(RAWSAVE)++;
        }
}


printvals()                     /* print variable values */
{
        int     i, j, clipline;
        register char   *cp;
        register int    k;

        for (i = 0; i < NVARS; i++)             /* print each variable */
            for (j = 0; j < vdef(i); j++) {     /* print each assignment */
                fputs(vnam(i), stdout);
                fputs("= ", stdout);
                k = clipline = ( vv[i].fixval == catvalues ? 64 : 320 )
                                - strlen(vnam(i)) ;
                cp = nvalue(vv+i, j);
                while (*cp) {
                    putchar(*cp++);
                    if (--k <= 0) {             /* line too long */
                        while (*cp && !isspace(*cp))
                            putchar(*cp++);     /* finish this word */
                        if (*cp) {              /* start new line */
                            putchar('\n');
                            fputs(vnam(i), stdout);
                            putchar('=');
                            k = clipline;
                        }
                    }
                }
                putchar('\n');
            }
        fflush(stdout);
}


oconv()                         /* run oconv and mkillum if necessary */
{
        static char     illumtmp[] = "ilXXXXXX";
        char    combuf[512], ocopts[64], mkopts[64];

        oconvopts(ocopts);              /* get options */
        if (octreedate < scenedate) {   /* check date on original octree */
                if (touchonly && octreedate)
                        touch(vval(OCTREE));
                else {                          /* build command */
                        if (vdef(MATERIAL))
                                sprintf(combuf, "oconv%s %s %s > %s", ocopts,
                                                vval(MATERIAL), vval(SCENE),
                                                vval(OCTREE));
                        else
                                sprintf(combuf, "oconv%s %s > %s", ocopts,
                                                vval(SCENE), vval(OCTREE));
                        
                        if (runcom(combuf)) {           /* run it */
                                fprintf(stderr,
                                "%s: error generating octree\n\t%s removed\n",
                                                progname, vval(OCTREE));
                                unlink(vval(OCTREE));
                                exit(1);
                        }
                }
                octreedate = time((time_t *)NULL);
                if (octreedate < scenedate)     /* in case clock is off */
                        octreedate = scenedate;
        }
        if (oct1name == vval(OCTREE))           /* no mkillum? */
                oct1date = octreedate > matdate ? octreedate : matdate;
        if (oct1date >= octreedate & oct1date >= matdate
                        & oct1date >= illumdate)        /* all done */
                return;
                                                /* make octree0 */
        if (oct0date < scenedate | oct0date < illumdate) {
                if (touchonly && oct0date)
                        touch(oct0name);
                else {                          /* build command */
                        if (octreedate)
                                sprintf(combuf, "oconv%s -i %s %s > %s", ocopts,
                                        vval(OCTREE), vval(ILLUM), oct0name);
                        else if (vdef(MATERIAL))
                                sprintf(combuf, "oconv%s %s %s > %s", ocopts,
                                        vval(MATERIAL), vval(ILLUM), oct0name);
                        else
                                sprintf(combuf, "oconv%s %s > %s", ocopts,
                                        vval(ILLUM), oct0name);
                        if (runcom(combuf)) {           /* run it */
                                fprintf(stderr,
                                "%s: error generating octree\n\t%s removed\n",
                                                progname, oct0name);
                                unlink(oct0name);
                                exit(1);
                        }
                }
                oct0date = time((time_t *)NULL);
                if (oct0date < octreedate)      /* in case clock is off */
                        oct0date = octreedate;
                if (oct0date < illumdate)       /* ditto */
                        oct0date = illumdate;
                }
        if (touchonly && oct1date)
                touch(oct1name);
        else {
                mkillumopts(mkopts);            /* build mkillum command */
                mktemp(illumtmp);
                sprintf(combuf, "mkillum%s %s \"<\" %s > %s", mkopts,
                                oct0name, vval(ILLUM), illumtmp);
                if (runcom(combuf)) {                   /* run it */
                        fprintf(stderr, "%s: error running mkillum\n",
                                        progname);
                        unlink(illumtmp);
                        exit(1);
                }
                                                /* make octree1 (frozen) */
                if (octreedate)
                        sprintf(combuf, "oconv%s -f -i %s %s > %s", ocopts,
                                vval(OCTREE), illumtmp, oct1name);
                else if (vdef(MATERIAL))
                        sprintf(combuf, "oconv%s -f %s %s > %s", ocopts,
                                vval(MATERIAL), illumtmp, oct1name);
                else
                        sprintf(combuf, "oconv%s -f %s > %s", ocopts,
                                illumtmp, oct1name);
                if (runcom(combuf)) {           /* run it */
                        fprintf(stderr,
                                "%s: error generating octree\n\t%s removed\n",
                                        progname, oct1name);
                        unlink(oct1name);
                        exit(1);
                }
                rmfile(illumtmp);
        }
        oct1date = time((time_t *)NULL);
        if (oct1date < oct0date)        /* in case clock is off */
                oct1date = oct0date;
}


char *
addarg(op, arg)                         /* add argument and advance pointer */
register char   *op, *arg;
{
        *op = ' ';
        while (*++op = *arg++)
                ;
        return(op);
}


oconvopts(oo)                           /* get oconv options */
register char   *oo;
{
        /* BEWARE:  This may be called via setdefaults(), so no assumptions */

        *oo = '\0';
        if (vdef(OCONV))
                addarg(oo, vval(OCONV));
}


mkillumopts(mo)                         /* get mkillum options */
register char   *mo;
{
        /* BEWARE:  This may be called via setdefaults(), so no assumptions */

        *mo = '\0';
        if (vdef(MKILLUM))
                addarg(mo, vval(MKILLUM));
}


checkambfile()                  /* check date on ambient file */
{
        time_t  afdate;

        if (!vdef(AMBFILE))
                return;
        if (!(afdate = fdate(vval(AMBFILE))))
                return;
        if (oct1date > afdate)
                if (touchonly)
                        touch(vval(AMBFILE));
                else
                        rmfile(vval(AMBFILE));
}


double
ambval()                                /* compute ambient value */
{
        if (vdef(EXPOSURE)) {
                if (vval(EXPOSURE)[0] == '+' || vval(EXPOSURE)[0] == '-')
                        return(.5/pow(2.,atof(vval(EXPOSURE))));
                return(.5/atof(vval(EXPOSURE)));
        }
        if (vlet(ZONE) == 'E')
                return(10.);
        if (vlet(ZONE) == 'I')
                return(.01);
        badvalue(ZONE);
}


renderopts(op, po)                      /* set rendering options */
char    *op, *po;
{
        switch(vscale(QUALITY)) {
        case LOW:
                lowqopts(op, po);
                break;
        case MEDIUM:
                medqopts(op, po);
                break;
        case HIGH:
                hiqopts(op, po);
                break;
        }
}


lowqopts(op, po)                        /* low quality rendering options */
register char   *op;
char    *po;
{
        double  d, org[3], siz[3];

        *op = '\0';
        *po = '\0';
        if (sscanf(vval(ZONE), "%*s %lf %lf %lf %lf %lf %lf", &org[0],
                        &siz[0], &org[1], &siz[1], &org[2], &siz[2]) != 6)
                badvalue(ZONE);
        siz[0] -= org[0]; siz[1] -= org[1]; siz[2] -= org[2];
        if (siz[0] <= FTINY | siz[1] <= FTINY | siz[2] <= FTINY)
                badvalue(ZONE);
        getoctcube(org, &d);
        d *= 3./(siz[0]+siz[1]+siz[2]);
        switch (vscale(DETAIL)) {
        case LOW:
                po = addarg(po, "-ps 16");
                op = addarg(op, "-dp 64");
                sprintf(op, " -ar %d", (int)(4*d));
                op += strlen(op);
                break;
        case MEDIUM:
                po = addarg(po, "-ps 8");
                op = addarg(op, "-dp 128");
                sprintf(op, " -ar %d", (int)(8*d));
                op += strlen(op);
                break;
        case HIGH:
                po = addarg(po, "-ps 4");
                op = addarg(op, "-dp 256");
                sprintf(op, " -ar %d", (int)(16*d));
                op += strlen(op);
                break;
        }
        po = addarg(po, "-pt .16");
        if (vbool(PENUMBRAS))
                op = addarg(op, "-ds .4");
        else
                op = addarg(op, "-ds 0");
        op = addarg(op, "-dt .2 -dc .25 -dr 0 -sj 0 -st .5");
        if (vdef(AMBFILE)) {
                sprintf(op, " -af %s", vval(AMBFILE));
                op += strlen(op);
        } else
                overture = 0;
        switch (vscale(VARIABILITY)) {
        case LOW:
                op = addarg(op, "-aa .4 -ad 64");
                break;
        case MEDIUM:
                op = addarg(op, "-aa .3 -ad 128");
                break;
        case HIGH:
                op = addarg(op, "-aa .25 -ad 256");
                break;
        }
        op = addarg(op, "-as 0");
        d = ambval();
        sprintf(op, " -av %.2g %.2g %.2g", d, d, d);
        op += strlen(op);
        op = addarg(op, "-lr 3 -lw .02");
        if (vdef(RENDER))
                op = addarg(op, vval(RENDER));
}


medqopts(op, po)                        /* medium quality rendering options */
register char   *op;
char    *po;
{
        double  d, org[3], siz[3];

        *op = '\0';
        *po = '\0';
        if (sscanf(vval(ZONE), "%*s %lf %lf %lf %lf %lf %lf", &org[0],
                        &siz[0], &org[1], &siz[1], &org[2], &siz[2]) != 6)
                badvalue(ZONE);
        siz[0] -= org[0]; siz[1] -= org[1]; siz[2] -= org[2];
        if (siz[0] <= FTINY | siz[1] <= FTINY | siz[2] <= FTINY)
                badvalue(ZONE);
        getoctcube(org, &d);
        d *= 3./(siz[0]+siz[1]+siz[2]);
        switch (vscale(DETAIL)) {
        case LOW:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 4" : "-ps 8");
                op = addarg(op, "-dp 256");
                sprintf(op, " -ar %d", (int)(8*d));
                op += strlen(op);
                break;
        case MEDIUM:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 3" : "-ps 6");
                op = addarg(op, "-dp 512");
                sprintf(op, " -ar %d", (int)(16*d));
                op += strlen(op);
                break;
        case HIGH:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 2" : "-ps 4");
                op = addarg(op, "-dp 1024");
                sprintf(op, " -ar %d", (int)(32*d));
                op += strlen(op);
                break;
        }
        po = addarg(po, "-pt .08");
        if (vbool(PENUMBRAS))
                op = addarg(op, "-ds .2 -dj .5");
        else
                op = addarg(op, "-ds .3");
        op = addarg(op, "-dt .1 -dc .5 -dr 1 -sj .7 -st .1");
        if (overture = vint(INDIRECT)) {
                sprintf(op, " -ab %d", overture);
                op += strlen(op);
        }
        if (vdef(AMBFILE)) {
                sprintf(op, " -af %s", vval(AMBFILE));
                op += strlen(op);
        } else
                overture = 0;
        switch (vscale(VARIABILITY)) {
        case LOW:
                op = addarg(op, "-aa .25 -ad 196 -as 0");
                break;
        case MEDIUM:
                op = addarg(op, "-aa .2 -ad 400 -as 64");
                break;
        case HIGH:
                op = addarg(op, "-aa .15 -ad 768 -as 196");
                break;
        }
        d = ambval();
        sprintf(op, " -av %.2g %.2g %.2g", d, d, d);
        op += strlen(op);
        op = addarg(op, "-lr 6 -lw .002");
        if (vdef(RENDER))
                op = addarg(op, vval(RENDER));
}


hiqopts(op, po)                         /* high quality rendering options */
register char   *op;
char    *po;
{
        double  d, org[3], siz[3];

        *op = '\0';
        *po = '\0';
        if (sscanf(vval(ZONE), "%*s %lf %lf %lf %lf %lf %lf", &org[0],
                        &siz[0], &org[1], &siz[1], &org[2], &siz[2]) != 6)
                badvalue(ZONE);
        siz[0] -= org[0]; siz[1] -= org[1]; siz[2] -= org[2];
        if (siz[0] <= FTINY | siz[1] <= FTINY | siz[2] <= FTINY)
                badvalue(ZONE);
        getoctcube(org, &d);
        d *= 3./(siz[0]+siz[1]+siz[2]);
        switch (vscale(DETAIL)) {
        case LOW:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 1" : "-ps 8");
                op = addarg(op, "-dp 1024");
                sprintf(op, " -ar %d", (int)(16*d));
                op += strlen(op);
                break;
        case MEDIUM:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 1" : "-ps 5");
                op = addarg(op, "-dp 2048");
                sprintf(op, " -ar %d", (int)(32*d));
                op += strlen(op);
                break;
        case HIGH:
                po = addarg(po, vbool(PENUMBRAS) ? "-ps 1" : "-ps 3");
                op = addarg(op, "-dp 4096");
                sprintf(op, " -ar %d", (int)(64*d));
                op += strlen(op);
                break;
        }
        po = addarg(po, "-pt .04");
        if (vbool(PENUMBRAS))
                op = addarg(op, "-ds .1 -dj .65");
        else
                op = addarg(op, "-ds .2");
        op = addarg(op, "-dt .05 -dc .75 -dr 3 -sj 1 -st .01");
        sprintf(op, " -ab %d", overture=vint(INDIRECT)+1);
        op += strlen(op);
        if (vdef(AMBFILE)) {
                sprintf(op, " -af %s", vval(AMBFILE));
                op += strlen(op);
        } else
                overture = 0;
        switch (vscale(VARIABILITY)) {
        case LOW:
                op = addarg(op, "-aa .15 -ad 256 -as 0");
                break;
        case MEDIUM:
                op = addarg(op, "-aa .125 -ad 512 -as 256");
                break;
        case HIGH:
                op = addarg(op, "-aa .08 -ad 1024 -as 512");
                break;
        }
        d = ambval();
        sprintf(op, " -av %.2g %.2g %.2g", d, d, d);
        op += strlen(op);
        op = addarg(op, "-lr 12 -lw .0005");
        if (vdef(RENDER))
                op = addarg(op, vval(RENDER));
}


xferopts(ro)                            /* transfer options if indicated */
char    *ro;
{
        int     fd, n;
        register char   *cp;
        
        n = strlen(ro);
        if (n < 2)
                return;
        if (vdef(OPTFILE)) {
                for (cp = ro; cp[1]; cp++)
                        if (isspace(cp[1]) && cp[2] == '-' && isalpha(cp[3]))
                                *cp = '\n';
                        else
                                *cp = cp[1];
                *cp = '\n';
                fd = open(vval(OPTFILE), O_WRONLY|O_CREAT|O_TRUNC, 0666);
                if (fd < 0 || write(fd, ro, n) != n || close(fd) < 0)
                        syserr(vval(OPTFILE));
                sprintf(ro, " @%s", vval(OPTFILE));
        }
#ifdef MSDOS
        else if (n > 50) {
                setenv("ROPT", ro+1);
                strcpy(ro, " $ROPT");
        }
#endif
}


pfiltopts(po)                           /* get pfilt options */
register char   *po;
{
        *po = '\0';
        if (vdef(EXPOSURE)) {
                po = addarg(po, "-1 -e");
                po = addarg(po, vval(EXPOSURE));
        }
        switch (vscale(QUALITY)) {
        case MEDIUM:
                po = addarg(po, "-r 1");
                break;
        case HIGH:
                po = addarg(po, "-m .25");
                break;
        }
        if (vdef(PFILT))
                po = addarg(po, vval(PFILT));
}


matchword(s1, s2)                       /* match white-delimited words */
register char   *s1, *s2;
{
        while (isspace(*s1)) s1++;
        while (isspace(*s2)) s2++;
        while (*s1 && !isspace(*s1))
                if (*s1++ != *s2++)
                        return(0);
        return(!*s2 || isspace(*s2));
}


char *
specview(vs)                            /* get proper view spec from vs */
register char   *vs;
{
        static char     vup[7][12] = {"-vu 0 0 -1","-vu 0 -1 0","-vu -1 0 0",
                        "-vu 0 0 1", "-vu 1 0 0","-vu 0 1 0","-vu 0 0 1"};
        static char     viewopts[128];
        register char   *cp;
        int     xpos, ypos, zpos, viewtype, upax;
        register int    i;
        double  cent[3], dim[3], mult, d;

        if (vs == NULL || *vs == '-')
                return(vs);
        upax = 0;                       /* get the up vector */
        if (vdef(UP)) {
                if (vval(UP)[0] == '-' || vval(UP)[0] == '+')
                        upax = 1-'X'+UPPER(vval(UP)[1]);
                else
                        upax = 1-'X'+vlet(UP);
                if (upax < 1 | upax > 3)
                        badvalue(UP);
                if (vval(UP)[0] == '-')
                        upax = -upax;
        }
                                        /* check standard view names */
        xpos = ypos = zpos = 0;
        if (*vs == 'X') {
                xpos = 1; vs++;
        } else if (*vs == 'x') {
                xpos = -1; vs++;
        }
        if (*vs == 'Y') {
                ypos = 1; vs++;
        } else if (*vs == 'y') {
                ypos = -1; vs++;
        }
        if (*vs == 'Z') {
                zpos = 1; vs++;
        } else if (*vs == 'z') {
                zpos = -1; vs++;
        }
        viewtype = 'v';
        if (*vs == 'v' | *vs == 'l' | *vs == 'a' | *vs == 'h' | *vs == 'c')
                viewtype = *vs++;
        cp = viewopts;
        if ((!*vs || isspace(*vs)) && (xpos|ypos|zpos)) {       /* got one! */
                *cp++ = '-'; *cp++ = 'v'; *cp++ = 't'; *cp++ = viewtype;
                if (sscanf(vval(ZONE), "%*s %lf %lf %lf %lf %lf %lf",
                                &cent[0], &dim[0], &cent[1], &dim[1],
                                &cent[2], &dim[2]) != 6)
                        badvalue(ZONE);
                for (i = 0; i < 3; i++) {
                        dim[i] -= cent[i];
                        if (dim[i] <= FTINY)
                                badvalue(ZONE);
                        cent[i] += .5*dim[i];
                }
                mult = vlet(ZONE)=='E' ? 2. : .45 ;
                sprintf(cp, " -vp %.2g %.2g %.2g -vd %.2g %.2g %.2g",
                                cent[0]+xpos*mult*dim[0],
                                cent[1]+ypos*mult*dim[1],
                                cent[2]+zpos*mult*dim[2],
                                -xpos*dim[0], -ypos*dim[1], -zpos*dim[2]);
                cp += strlen(cp);
                                        /* redirect up axis if necessary */
                switch (upax) {
                case 3:                 /* plus or minus Z axis */
                case -3:
                case 0:
                        if (!(xpos|ypos))
                                upax = 2;
                        break;
                case 2:                 /* plus or minus Y axis */
                case -2:
                        if (!(xpos|zpos))
                                upax = 1;
                        break;
                case 1:                 /* plus or minus X axis */
                case -1:
                        if (!(ypos|zpos))
                                upax = 3;
                        break;
                }
                cp = addarg(cp, vup[upax+3]);
                switch (viewtype) {
                case 'v':
                        cp = addarg(cp, "-vh 45 -vv 45");
                        break;
                case 'l':
                        d = sqrt(dim[0]*dim[0]+dim[1]*dim[1]+dim[2]*dim[2]);
                        sprintf(cp, " -vh %.2g -vv %.2g", d, d);
                        cp += strlen(cp);
                        break;
                case 'a':
                case 'h':
                        cp = addarg(cp, "-vh 180 -vv 180");
                        break;
                case 'c':
                        cp = addarg(cp, "-vh 180 -vv 90");
                        break;
                }
        } else {
                while (!isspace(*vs))           /* else skip id */
                        if (!*vs++)
                                return(NULL);
                if (upax) {                     /* specify up vector */
                        strcpy(cp, vup[upax+3]);
                        cp += strlen(cp);
                }
        }
        if (cp == viewopts)             /* append any additional options */
                vs++;           /* skip prefixed space if unneeded */
        strcpy(cp, vs);
#ifdef MSDOS
        if (strlen(viewopts) > 40) {
                setenv("VIEW", viewopts);
                return("$VIEW");
        }
#endif
        return(viewopts);
}


char *
getview(n, vn)                          /* get view n, or NULL if none */
int     n;
char    *vn;            /* returned view name */
{
        register char   *mv;

        if (viewselect != NULL) {               /* command-line selected */
                if (n)                          /* only do one */
                        return(NULL);
                if (viewselect[0] == '-') {     /* already specified */
                        if (vn != NULL) *vn = '\0';
                        return(viewselect);
                }
                if (vn != NULL) {
                        for (mv = viewselect; *mv && !isspace(*mv);
                                        *vn++ = *mv++)
                                ;
                        *vn = '\0';
                }
                                                /* view number? */
                if (isint(viewselect))
                        return(specview(nvalue(vv+VIEW, atoi(viewselect)-1)));
                                                /* check list */
                while ((mv = nvalue(vv+VIEW, n++)) != NULL)
                        if (matchword(viewselect, mv))
                                return(specview(mv));
                return(specview(viewselect));   /* standard view? */
        }
        mv = nvalue(vv+VIEW, n);                /* use view n */
        if (vn != NULL & mv != NULL) {
                register char   *mv2 = mv;
                if (*mv2 != '-')
                        while (*mv2 && !isspace(*mv2))
                                *vn++ = *mv2++;
                *vn = '\0';
        }
        return(specview(mv));
}


printview(vopts)                        /* print out selected view */
register char   *vopts;
{
        extern char     *atos(), *getenv();
        char    buf[256];
        FILE    *fp;
        register char   *cp;

        if (vopts == NULL)
                return(-1);
        fputs("VIEW=", stdout);
        do {
                if (matchword(vopts, "-vf")) {          /* expand view file */
                        vopts = sskip(vopts);
                        if (!*atos(buf, sizeof(buf), vopts))
                                return(-1);
                        if ((fp = fopen(buf, "r")) == NULL)
                                return(-1);
                        for (buf[sizeof(buf)-2] = '\n';
                                        fgets(buf, sizeof(buf), fp) != NULL &&
                                                buf[0] != '\n';
                                        buf[sizeof(buf)-2] = '\n') {
                                if (buf[sizeof(buf)-2] != '\n') {
                                        ungetc(buf[sizeof(buf)-2], fp);
                                        buf[sizeof(buf)-2] = '\0';
                                }
                                if (matchword(buf, "VIEW=") ||
                                                matchword(buf, "rview")) {
                                        for (cp = sskip(buf); *cp && *cp != '\n'; cp++)
                                                putchar(*cp);
                                }
                        }
                        fclose(fp);
                        vopts = sskip(vopts);
                } else {
                        while (isspace(*vopts))
                                vopts++;
                        putchar(' ');
#ifdef MSDOS
                        if (*vopts == '$') {            /* expand env. var. */
                                if (!*atos(buf, sizeof(buf), vopts+1))
                                        return(-1);
                                if ((cp = getenv(buf)) == NULL)
                                        return(-1);
                                fputs(cp, stdout);
                                vopts = sskip(vopts);
                        } else
#endif
                                while (*vopts && !isspace(*vopts))
                                        putchar(*vopts++);
                }
        } while (*vopts++);
        putchar('\n');
        return(0);
}


rview(opts, po)                         /* run rview with first view */
char    *opts, *po;
{
        char    *vw;
        char    combuf[512];
                                        /* build command */
        if (touchonly || (vw = getview(0, NULL)) == NULL)
                return;
        if (sayview)
                printview(vw);
        sprintf(combuf, "rview %s%s%s -R %s ", vw, po, opts, rifname);
        if (rvdevice != NULL)
                sprintf(combuf+strlen(combuf), "-o %s ", rvdevice);
        if (vdef(EXPOSURE))
                sprintf(combuf+strlen(combuf), "-pe %s ", vval(EXPOSURE));
        strcat(combuf, oct1name);
        if (runcom(combuf)) {           /* run it */
                fprintf(stderr, "%s: error running rview\n", progname);
                exit(1);
        }
}


rpict(opts, po)                         /* run rpict and pfilt for each view */
char    *opts, *po;
{
        char    combuf[1024];
        char    rawfile[MAXPATH], picfile[MAXPATH], rep[MAXPATH+16], res[32];
        char    pfopts[128];
        char    vs[32], *vw;
        int     vn, mult;
        time_t  rfdt, pfdt;
                                        /* get pfilt options */
        pfiltopts(pfopts);
                                        /* get resolution, reporting */
        switch (vscale(QUALITY)) {
        case LOW:
                mult = 1;
                break;
        case MEDIUM:
                mult = 2;
                break;
        case HIGH:
                mult = 3;
                break;
        }
        {
                int     xres, yres;
                double  aspect;
                int     n;
                n = sscanf(vval(RESOLUTION), "%d %d %lf", &xres, &yres, &aspect);
                if (n == 3)
                        sprintf(res, "-x %d -y %d -pa %.3f",
                                        mult*xres, mult*yres, aspect);
                else if (n) {
                        if (n == 1) yres = xres;
                        sprintf(res, "-x %d -y %d", mult*xres, mult*yres);
                } else
                        badvalue(RESOLUTION);
        }
        rep[0] = '\0';
        if (vdef(REPORT)) {
                double  minutes;
                int     n;
                n = sscanf(vval(REPORT), "%lf %s", &minutes, rawfile);
                if (n == 2)
                        sprintf(rep, " -t %d -e %s", (int)(minutes*60), rawfile);
                else if (n == 1)
                        sprintf(rep, " -t %d", (int)(minutes*60));
                else
                        badvalue(REPORT);
        }
                                        /* do each view */
        vn = 0;
        while ((vw = getview(vn++, vs)) != NULL) {
                if (sayview)
                        printview(vw);
                if (!vs[0])
                        sprintf(vs, "%d", vn);
                sprintf(picfile, "%s_%s.pic", vval(PICTURE), vs);
                                                /* check date on picture */
                pfdt = fdate(picfile);
                if (pfdt >= oct1date)
                        continue;
                                                /* get raw file name */
                sprintf(rawfile, "%s_%s.raw", vval(PICTURE), vs);
                rfdt = fdate(rawfile);
                if (touchonly) {                /* update times only */
                        if (rfdt) {
                                if (rfdt < oct1date)
                                        touch(rawfile);
                        } else if (pfdt && pfdt < oct1date)
                                touch(picfile);
                        continue;
                }
                                                /* build rpict command */
                if (rfdt >= oct1date)           /* recover */
                        sprintf(combuf, "rpict%s%s%s -ro %s %s",
                                        rep, po, opts, rawfile, oct1name);
                else {
                        if (overture) {         /* run overture calculation */
                                sprintf(combuf,
                                "rpict%s %s%s -x 64 -y 64 -ps 1 %s > %s",
                                                rep, vw, opts,
                                                oct1name, overfile);
                                if (runcom(combuf)) {
                                        fprintf(stderr,
                                        "%s: error in overture for view %s\n",
                                                progname, vs);
                                        exit(1);
                                }
#ifdef NIX
                                rmfile(overfile);
#endif
                        }
                        sprintf(combuf, "rpict%s %s %s%s%s %s > %s",
                                        rep, vw, res, po, opts,
                                oct1name, rawfile);
                }
                if (runcom(combuf)) {           /* run rpict */
                        fprintf(stderr, "%s: error rendering view %s\n",
                                        progname, vs);
                        exit(1);
                }
                                                /* build pfilt command */
                if (mult > 1)
                        sprintf(combuf, "pfilt%s -x /%d -y /%d %s > %s",
                                        pfopts, mult, mult, rawfile, picfile);
                else
                        sprintf(combuf, "pfilt%s %s > %s", pfopts,
                                        rawfile, picfile);
                if (runcom(combuf)) {           /* run pfilt */
                        fprintf(stderr,
                        "%s: error filtering view %s\n\t%s removed\n",
                                        progname, vs, picfile);
                        unlink(picfile);
                        exit(1);
                }
                                                /* remove/rename raw file */
                if (vbool(RAWSAVE)) {
                        sprintf(combuf, "%s_%s.rwp", vval(PICTURE), vs);
                        mvfile(rawfile, combuf);
                } else
                        rmfile(rawfile);
        }
}


touch(fn)                       /* update a file */
char    *fn;
{
        if (!silent)
                printf("\ttouch %s\n", fn);
        if (noaction)
                return(0);
#ifdef notused
        if (access(fn, F_OK) == -1)             /* create it */
                if (close(open(fn, O_WRONLY|O_CREAT, 0666)) == -1)
                        return(-1);
#endif
        return(setfdate(fn, time((time_t *)NULL)));
}


runcom(cs)                      /* run command */
char    *cs;
{
        if (!silent)            /* echo it */
                printf("\t%s\n", cs);
        if (noaction)
                return(0);
        fflush(stdout);         /* flush output and pass to shell */
        return(system(cs));
}


rmfile(fn)                      /* remove a file */
char    *fn;
{
        if (!silent)
#ifdef MSDOS
                printf("\tdel %s\n", fn);
#else
                printf("\trm -f %s\n", fn);
#endif
        if (noaction)
                return(0);
        return(unlink(fn));
}


mvfile(fold, fnew)              /* move a file */
char    *fold, *fnew;
{
        if (!silent)
#ifdef MSDOS
                printf("\trename %s %s\n", fold, fnew);
#else
                printf("\tmv %s %s\n", fold, fnew);
#endif
        if (noaction)
                return(0);
        return(rename(fold, fnew));
}


#ifdef MSDOS
setenv(vname, value)            /* set an environment variable */
char    *vname, *value;
{
        register char   *evp;

        evp = bmalloc(strlen(vname)+strlen(value)+2);
        if (evp == NULL)
                syserr(progname);
        sprintf(evp, "%s=%s", vname, value);
        if (putenv(evp) != 0) {
                fprintf(stderr, "%s: out of environment space\n", progname);
                exit(1);
        }
        if (!silent)
                printf("set %s\n", evp);
}
#endif


badvalue(vc)                    /* report bad variable value and exit */
int     vc;
{
        fprintf(stderr, "%s: bad value for variable '%s'\n",
                        progname, vnam(vc));
        exit(1);
}


syserr(s)                       /* report a system error and exit */
char    *s;
{
        perror(s);
        exit(1);
}
Revision:	2.44
Committed:	Fri Aug 18 10:39:56 1995 UTC (30 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.43:	+4 -1 lines
Log Message:	added cylindrical view type