cv/mgflib/mgf2inv.c

/* Copyright (c) 1995 Regents of the University of California */

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

/*
 * Convert MGF to Inventor file.
 *
 *      December 1995   Greg Ward
 */

#include <stdio.h>

#include <math.h>

#include <ctype.h>

#include "parser.h"

#include "lookup.h"

#define O_INV1          1       /* Inventor 1.0 output */
#define O_INV2          2       /* Inventor 2.0 output */
#define O_VRML          3       /* VRML output */

#define MAXID           48      /* maximum identifier length */

#define VERTFMT         "%+16.9e %+16.9e %+16.9e\n%+6.3f %+6.3f %+6.3f"
#define VZVECT          "+0.000 +0.000 +0.000"
#define VFSEPPOS        50      /* position of newline in above */
#define VFLEN           72      /* total vertex string length */
#define MAXVERT         10240   /* maximum cached vertices */

#define setvkey(k,v)    sprintf(k,VERTFMT,(v)->p[0],(v)->p[1],(v)->p[2],\
                                        (v)->n[0],(v)->n[1],(v)->n[2]);

char    vlist[MAXVERT][VFLEN];  /* our vertex cache */
int     nverts;                 /* current cache size */

LUTAB   vert_tab = LU_SINIT(NULL,NULL);

struct face {
        struct face     *next;          /* next face in list */
        short           nv;             /* number of vertices */
        short           vl[3];          /* vertex index list (variable) */
}       *flist, *flast;         /* our face cache */

#define newface(n)      (struct face *)malloc(sizeof(struct face) + \
                                ((n) > 3 ? (n)-3 : 0)*sizeof(short))
#define freeface(f)     free((MEM_PTR)f)

#define TABSTOP         8       /* assumed number of characters per tab */
#define SHIFTW          2       /* nesting shift width */
#define MAXIND          15      /* maximum indent level */

char    tabs[MAXIND*SHIFTW+1];  /* current tab-in string */

#define curmatname      (c_cmname == NULL ? "mat" : to_id(c_cmname))

int     outtype = O_INV2;       /* output format */

extern int      i_comment(), i_object(), i_xf(),
                i_cyl(), i_face(), i_sph();

extern char     *to_id();


main(argc, argv)
int     argc;
char    *argv[];
{
        int     i;
                                /* initialize dispatch table */
        mg_ehand[MG_E_COMMENT] = i_comment;     /* we pass comments */
        mg_ehand[MG_E_COLOR] = c_hcolor;        /* they get color */
        mg_ehand[MG_E_CMIX] = c_hcolor;         /* they mix colors */
        mg_ehand[MG_E_CSPEC] = c_hcolor;        /* they get spectra */
        mg_ehand[MG_E_CXY] = c_hcolor;          /* they get chromaticities */
        mg_ehand[MG_E_CCT] = c_hcolor;          /* they get color temp's */
        mg_ehand[MG_E_CYL] = i_cyl;             /* we do cylinders */
        mg_ehand[MG_E_ED] = c_hmaterial;        /* they get emission */
        mg_ehand[MG_E_FACE] = i_face;           /* we do faces */
        mg_ehand[MG_E_MATERIAL] = c_hmaterial;  /* they get materials */
        mg_ehand[MG_E_NORMAL] = c_hvertex;      /* they get normals */
        mg_ehand[MG_E_OBJECT] = i_object;       /* we track object names */
        mg_ehand[MG_E_POINT] = c_hvertex;       /* they get points */
        mg_ehand[MG_E_RD] = c_hmaterial;        /* they get diffuse refl. */
        mg_ehand[MG_E_RS] = c_hmaterial;        /* they get specular refl. */
        mg_ehand[MG_E_SIDES] = c_hmaterial;     /* they get # sides */
        mg_ehand[MG_E_SPH] = i_sph;             /* we do spheres */
        mg_ehand[MG_E_TD] = c_hmaterial;        /* they get diffuse trans. */
        mg_ehand[MG_E_TS] = c_hmaterial;        /* they get specular trans. */
        mg_ehand[MG_E_VERTEX] = c_hvertex;      /* they get vertices */
        mg_ehand[MG_E_XF] = i_xf;               /* we track transforms */
        mg_init();              /* initialize the parser */
                                /* get options and print format line */
        for (i = 1; i < argc && argv[i][0] == '-'; i++)
                if (!strcmp(argv[i], "-vrml"))
                        outtype = O_VRML;
                else if (!strcmp(argv[i], "-1"))
                        outtype = O_INV1;
                else if (!strcmp(argv[i], "-2"))
                        outtype = O_INV2;
                else
                        goto userr;
        switch (outtype) {
        case O_INV1:
                printf("#Inventor V1.0 ascii\n");
                break;
        case O_INV2:
                printf("#Inventor V2.0 ascii\n");
                break;
        case O_VRML:
                printf("#VRML 1.0 ascii\n");
                break;
        }
        printf("## Translated from MGF Version %d.%d\n", MG_VMAJOR, MG_VMINOR);
        printf("Separator {\n");                /* begin root node */
                                                /* general properties */
        printf("MaterialBinding { value OVERALL }\n");
        printf("NormalBinding { value PER_VERTEX_INDEXED }\n");
        if (outtype != O_INV1) {
                printf("ShapeHints {\n");
                printf("\tvertexOrdering CLOCKWISE\n");
                printf("\tfaceType UNKNOWN_FACE_TYPE\n");
                printf("}\n");
        }
        if (i == argc) {        /* load standard input */
                if (mg_load(NULL) != MG_OK)
                        exit(1);
                if (mg_nunknown)
                        printf("## %s: %u unknown entities\n",
                                        argv[0], mg_nunknown);
        }
                                /* load MGF files */
        for ( ; i < argc; i++) {
                printf("## %s %s ##############################\n",
                                argv[0], argv[i]);
                mg_nunknown = 0;
                if (mg_load(argv[i]) != MG_OK)
                        exit(1);
                if (mg_nunknown)
                        printf("## %s %s: %u unknown entities\n",
                                        argv[0], argv[i], mg_nunknown);
        }
        flush_cache();          /* flush face cache, just in case */
        printf("}\n");          /* close root node */
        exit(0);
userr:
        fprintf(stderr, "%s: [-1|-2|-vrml] [file] ..\n", argv[0]);
        exit(1);
}


indent(deeper)                          /* indent in or out */
int     deeper;
{
        static int      level;          /* current nesting level */
        register int    i;
        register char   *cp;

        if (deeper) level++;            /* in or out? */
        else if (level > 0) level--;
                                        /* compute actual shift */
        if ((i = level) > MAXIND) i = MAXIND;
        cp = tabs;
        for (i *= SHIFTW; i >= TABSTOP; i -= TABSTOP)
                *cp++ = '\t';
        while (i--)
                *cp++ = ' ';
        *cp = '\0';
}


int
i_comment(ac, av)                       /* transfer comment as is */
int     ac;
char    **av;
{
        fputs(tabs, stdout);
        putchar('#');                   /* Inventor comment character */
        while (--ac > 0) {
                putchar(' ');
                fputs(*++av, stdout);
        }
        putchar('\n');
        return(MG_OK);
}


int
i_object(ac, av)                        /* group object name */
int     ac;
char    **av;
{
        static int      objnest;

        flush_cache();                  /* flush cached objects */
        if (ac == 2) {                          /* start group */
                printf("%sDEF %s Group {\n", tabs, to_id(av[1]));
                indent(1);
                objnest++;
                return(MG_OK);
        }
        if (ac == 1) {                          /* end group */
                if (--objnest < 0)
                        return(MG_ECNTXT);
                indent(0);
                fputs(tabs, stdout);
                fputs("}\n", stdout);
                return(MG_OK);
        }
        return(MG_EARGC);
}


int
i_xf(ac, av)                            /* transform object(s) */
int     ac;
char    **av;
{
        static long     xfid;
        register XF_SPEC        *spec;

        flush_cache();                  /* flush cached objects */
        if (ac == 1) {                  /* end of transform */
                if ((spec = xf_context) == NULL)
                        return(MG_ECNTXT);
                indent(0);                      /* close original segment */
                printf("%s}\n", tabs);
                indent(0);
                printf("%s}\n", tabs);
                if (spec->xarr != NULL) {       /* check for iteration */
                        register struct xf_array        *ap = spec->xarr;
                        register int    n;

                        ap->aarg[ap->ndim-1].i = 1;     /* iterate array */
                        for ( ; ; ) {
                                n = ap->ndim-1;
                                while (ap->aarg[n].i < ap->aarg[n].n) {
                                        sprintf(ap->aarg[n].arg, "%d",
                                                        ap->aarg[n].i);
                                        printf("%sSeparator {\n", tabs);
                                        indent(1);
                                        (void)put_xform(spec);
                                        printf("%sUSE _xf%ld\n", tabs,
                                                        spec->xid);
                                        indent(0);
                                        printf("%s}\n", tabs);
                                        ++ap->aarg[n].i;
                                }
                                ap->aarg[n].i = 0;
                                (void)strcpy(ap->aarg[n].arg, "0");
                                while (n-- && ++ap->aarg[n].i >= ap->aarg[n].n) {
                                        ap->aarg[n].i = 0;
                                        (void)strcpy(ap->aarg[n].arg, "0");
                                }
                                if (n < 0)
                                        break;
                                sprintf(ap->aarg[n].arg, "%d", ap->aarg[n].i);
                        }
                }
                                                /* pop transform */
                xf_context = spec->prev;
                free_xf(spec);
                return(MG_OK);
        }
                                        /* else allocate new transform */
        if ((spec = new_xf(ac-1, av+1)) == NULL)
                return(MG_EMEM);
        spec->xid = ++xfid;             /* assign unique ID */
        spec->prev = xf_context;        /* push onto stack */
        xf_context = spec;
                                        /* translate xf specification */
        printf("%sSeparator {\n", tabs);
        indent(1);
        if (put_xform(spec) < 0)
                return(MG_ETYPE);
        printf("%sDEF _xf%ld Group {\n", tabs, spec->xid);      /* begin */
        indent(1);
        return(MG_OK);
}


int
put_xform(spec)                 /* translate and print transform */
register XF_SPEC        *spec;
{
        register char   **av;
        register int    n;

        n = xf_ac(spec) - xf_ac(spec->prev);
        if (xf(&spec->xf, n, av=xf_av(spec)) != n)
                return(-1);
        printf("%sMatrixTransform {\n", tabs);
        indent(1);
        printf("%s# xf", tabs);         /* put out original as comment */
        while (n--) {
                putchar(' ');
                fputs(*av++, stdout);
        }
        putchar('\n');                  /* put out computed matrix */
        printf("%smatrix %13.9g %13.9g %13.9g %13.9g\n", tabs,
                        spec->xf.xfm[0][0], spec->xf.xfm[0][1],
                        spec->xf.xfm[0][2], spec->xf.xfm[0][3]);
        for (n = 1; n < 4; n++)
                printf("%s       %13.9g %13.9g %13.9g %13.9g\n", tabs,
                                spec->xf.xfm[n][0], spec->xf.xfm[n][1],
                                spec->xf.xfm[n][2], spec->xf.xfm[n][3]);
        indent(0);
        printf("%s}\n", tabs);
        return(0);
}


int
put_material()                  /* put out current material */
{
        char    *mname = curmatname;
        float   rgbval[3];

        if (!c_cmaterial->clock) {      /* current, just use it */
                printf("%sUSE %s\n", tabs, mname);
                return(0);
        }
                                /* else update definition */
        printf("%sDEF %s Group {\n", tabs, mname);
        indent(1);
        printf("%sMaterial {\n", tabs);
        indent(1);
        mgf2rgb(&c_cmaterial->rd_c, c_cmaterial->rd, rgbval);
        printf("%sambientColor %.4f %.4f %.4f\n", tabs,
                        rgbval[0], rgbval[1], rgbval[2]);
        printf("%sdiffuseColor %.4f %.4f %.4f\n", tabs,
                        rgbval[0], rgbval[1], rgbval[2]);
        if (c_cmaterial->rs > FTINY) {
                mgf2rgb(&c_cmaterial->rs_c, c_cmaterial->rs, rgbval);
                printf("%sspecularColor %.4f %.4f %.4f\n", tabs,
                                rgbval[0], rgbval[1], rgbval[2]);
                printf("%sshininess %.3f\n", tabs, 1.-sqrt(c_cmaterial->rs_a));
        }
        if (c_cmaterial->ed > FTINY) {
                mgf2rgb(&c_cmaterial->ed_c, 1.0, rgbval);
                printf("%semissiveColor %.4f %.4f %.4f\n", tabs,
                                rgbval[0], rgbval[1], rgbval[2]);
        }
        if (c_cmaterial->ts > FTINY)
                printf("%stransparency %.4f\n", tabs,
                                c_cmaterial->ts + c_cmaterial->td);
        indent(0);
        printf("%s}\n", tabs);
        if (outtype != O_INV1)
                printf("%sShapeHints { shapeType %s }\n", tabs,
                        c_cmaterial->sided ? "SOLID" : "UNKNOWN_SHAPE_TYPE");
        indent(0);
        printf("%s}\n", tabs);
        c_cmaterial->clock = 0;
        return(0);
}


int
i_face(ac, av)                  /* translate an N-sided face */
int     ac;
char    **av;
{
        static char     lastmat[MAXID];
        struct face     *newf;
        register C_VERTEX       *vp;
        register LUENT  *lp;
        register int    i;

        if (ac < 4)
                return(MG_EARGC);
        if ( strcmp(lastmat, curmatname) || c_cmaterial->clock ||
                        nverts == 0 || nverts+ac-1 >= MAXVERT) {
                flush_cache();                  /* new cache */
                lu_init(&vert_tab, MAXVERT);
                printf("%sSeparator {\n", tabs);
                indent(1);
                if (put_material() < 0)         /* put out material */
                        return(MG_EBADMAT);
                (void)strcpy(lastmat, curmatname);
        }
                                /* allocate new face */
        if ((newf = newface(ac-1)) == NULL)
                return(MG_EMEM);
        newf->nv = ac-1;
                                /* get vertex references */
        for (i = 0; i < newf->nv; i++) {
                if ((vp = c_getvert(av[i+1])) == NULL)
                        return(MG_EUNDEF);
                setvkey(vlist[nverts], vp);
                lp = lu_find(&vert_tab, vlist[nverts]);
                if (lp == NULL)
                        return(MG_EMEM);
                if (lp->key == NULL)
                        lp->key = (char *)vlist[nverts++];
                newf->vl[i] = ((char (*)[VFLEN])lp->key - vlist);
        }
                                /* add to face list */
        newf->next = NULL;
        if (flist == NULL)
                flist = newf;
        else
                flast->next = newf;
        flast = newf;
        return(MG_OK);          /* we'll actually put it out later */
}


int
i_sph(ac, av)                   /* translate sphere description */
int     ac;
char    **av;
{
        register C_VERTEX       *cent;

        if (ac != 3)
                return(MG_EARGC);
        flush_cache();          /* flush vertex cache */
        printf("%sSeparator {\n", tabs);
        indent(1);
                                /* put out current material */
        if (put_material() < 0)
                return(MG_EBADMAT);
                                /* get center */
        if ((cent = c_getvert(av[1])) == NULL)
                return(MG_EUNDEF);
                                /* get radius */
        if (!isflt(av[2]))
                return(MG_ETYPE);
        printf("%sTranslation { translation %13.9g %13.9g %13.9g }\n", tabs,
                        cent->p[0], cent->p[1], cent->p[2]);
        printf("%sSphere { radius %s }\n", tabs, av[2]);
        indent(0);
        printf("%s}\n", tabs);
        return(MG_OK);
}


int
i_cyl(ac, av)                   /* translate a cylinder description */
int     ac;
char    **av;
{
        register C_VERTEX       *v1, *v2;
        FVECT   va;
        double  length, angle;

        if (ac != 4)
                return(MG_EARGC);
        flush_cache();          /* flush vertex cache */
        printf("%sSeparator {\n", tabs);
        indent(1);
                                /* put out current material */
        if (put_material() < 0)
                return(MG_EBADMAT);
                                /* get endpoints */
        if ((v1 = c_getvert(av[1])) == NULL | (v2 = c_getvert(av[3])) == NULL)
                return(MG_EUNDEF);
                                /* get radius */
        if (!isflt(av[2]))
                return(MG_ETYPE);
                                /* compute transform */
        va[0] = v2->p[0] - v1->p[0];
        va[1] = v2->p[1] - v1->p[1];
        va[2] = v2->p[2] - v1->p[2];
        length = sqrt(DOT(va,va));
        angle = acos(va[1]/length);
        printf("%sTranslation { translation %13.9g %13.9g %13.9g }\n", tabs,
                        .5*(v1->p[0]+v2->p[0]), .5*(v1->p[1]+v2->p[1]),
                        .5*(v1->p[2]+v2->p[2]));
        printf("%sRotation { rotation %.9g %.9g %.9g %.9g }\n", tabs,
                        va[2], 0., -va[0], angle);
                                /* open-ended */
        printf("%sCylinder { parts SIDES height %13.9g radius %s }\n", tabs,
                        length, av[2]);
        indent(0);
        printf("%s}\n", tabs);
        return(MG_OK);
}


char *
to_id(name)                     /* make sure a name is a valid Inventor ID */
register char   *name;
{
        static char     id[MAXID];
        register char   *cp;

        for (cp = id; *name && cp < MAXID-1+id; name++)
                if (isalnum(*name) || *name == '_')
                        *cp++ = *name;
                else
                        *cp++ = '_';
        *cp = '\0';
        return(id);
}


flush_cache()                   /* put out cached faces */
{
        int     donorms = 0;
        register struct face    *f;
        register int    i;

        if (nverts == 0)
                return;
                                        /* put out coordinates */
        printf("%sCoordinate3 {\n", tabs);
        indent(1);
        vlist[0][VFSEPPOS] = '\0';
        printf("%spoint [ %s", tabs, vlist[0]);
        for (i = 1; i < nverts; i++) {
                vlist[i][VFSEPPOS] = '\0';
                printf(",\n%s        %s", tabs, vlist[i]);
                if (strcmp(VFSEPPOS+1+vlist[i], VZVECT))
                        donorms++;
        }
        indent(0);
        printf(" ]\n%s}\n", tabs);
        if (donorms) {                  /* put out normals */
                printf("%sNormal {\n", tabs);
                indent(1);
                printf("%svector [ %s", tabs, VFSEPPOS+1+vlist[0]);
                for (i = 1; i < nverts; i++)
                        printf(",\n%s         %s", tabs, VFSEPPOS+1+vlist[i]);
                indent(0);
                printf(" ]\n%s}\n", tabs);
        }
                                        /* put out faces */
        printf("%sIndexedFaceSet {\n", tabs);
        indent(1);
        f = flist;                      /* coordinate indices */
        printf("%scoordIndex [ %d", tabs, f->vl[0]);
        for (i = 1; i < f->nv; i++)
                printf(", %d", f->vl[i]);
        for (f = f->next; f != NULL; f = f->next) {
                printf(", -1,\n%s             %d", tabs, f->vl[0]);
                for (i = 1; i < f->nv; i++)
                        printf(", %d", f->vl[i]);
        }
        printf(" ]\n");
        if (donorms) {
                f = flist;                      /* normal indices */
                printf("%snormalIndex [ %d", tabs, f->vl[0]);
                for (i = 1; i < f->nv; i++)
                        printf(", %d", f->vl[i]);
                for (f = f->next; f != NULL; f = f->next) {
                        printf(", -1,\n%s              %d", tabs, f->vl[0]);
                        for (i = 1; i < f->nv; i++)
                                printf(", %d", f->vl[i]);
                }
                printf(" ]\n");
        }
        indent(0);                      /* close IndexedFaceSet */
        printf("%s}\n", tabs);
        indent(0);                      /* close face group */
        printf("%s}\n", tabs);
        while ((f = flist) != NULL) {   /* free face list */
                flist = f->next;
                freeface(f);
        }
        lu_done(&vert_tab);             /* clear lookup table */
        nverts = 0;
}
Revision:	1.4
Committed:	Tue Dec 5 10:59:27 1995 UTC (28 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -1 lines
Log Message:	changed shininess setting to a slightly better (at least different) guess
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1995 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* Convert MGF to Inventor file.
9			*
10			* December 1995 Greg Ward
11			*/
12
13			#include <stdio.h>
14
15			#include <math.h>
16
17	greg	1.2	#include <ctype.h>
18
19	greg	1.1	#include "parser.h"
20
21	greg	1.3	#include "lookup.h"
22
23	greg	1.2	#define O_INV1 1 /* Inventor 1.0 output */
24			#define O_INV2 2 /* Inventor 2.0 output */
25			#define O_VRML 3 /* VRML output */
26	greg	1.1
27	greg	1.3	#define MAXID 48 /* maximum identifier length */
28
29			#define VERTFMT "%+16.9e %+16.9e %+16.9e\n%+6.3f %+6.3f %+6.3f"
30			#define VZVECT "+0.000 +0.000 +0.000"
31			#define VFSEPPOS 50 /* position of newline in above */
32			#define VFLEN 72 /* total vertex string length */
33			#define MAXVERT 10240 /* maximum cached vertices */
34
35			#define setvkey(k,v) sprintf(k,VERTFMT,(v)->p[0],(v)->p[1],(v)->p[2],\
36			(v)->n[0],(v)->n[1],(v)->n[2]);
37
38			char vlist[MAXVERT][VFLEN]; /* our vertex cache */
39			int nverts; /* current cache size */
40
41			LUTAB vert_tab = LU_SINIT(NULL,NULL);
42
43			struct face {
44			struct face next; / next face in list */
45			short nv; /* number of vertices */
46			short vl[3]; /* vertex index list (variable) */
47			} flist, flast; /* our face cache */
48
49			#define newface(n) (struct face *)malloc(sizeof(struct face) + \
50			((n) > 3 ? (n)-3 : 0)*sizeof(short))
51			#define freeface(f) free((MEM_PTR)f)
52
53	greg	1.1	#define TABSTOP 8 /* assumed number of characters per tab */
54			#define SHIFTW 2 /* nesting shift width */
55			#define MAXIND 15 /* maximum indent level */
56
57	greg	1.2	char tabs[MAXINDSHIFTW+1]; / current tab-in string */
58	greg	1.1
59	greg	1.3	#define curmatname (c_cmname == NULL ? "mat" : to_id(c_cmname))
60
61	greg	1.2	int outtype = O_INV2; /* output format */
62	greg	1.1
63	greg	1.2	extern int i_comment(), i_object(), i_xf(),
64			i_cyl(), i_face(), i_sph();
65	greg	1.1
66	greg	1.2	extern char *to_id();
67	greg	1.1
68
69			main(argc, argv)
70			int argc;
71			char *argv[];
72			{
73			int i;
74			/* initialize dispatch table */
75			mg_ehand[MG_E_COMMENT] = i_comment; /* we pass comments */
76			mg_ehand[MG_E_COLOR] = c_hcolor; /* they get color */
77			mg_ehand[MG_E_CMIX] = c_hcolor; /* they mix colors */
78			mg_ehand[MG_E_CSPEC] = c_hcolor; /* they get spectra */
79			mg_ehand[MG_E_CXY] = c_hcolor; /* they get chromaticities */
80			mg_ehand[MG_E_CCT] = c_hcolor; /* they get color temp's */
81			mg_ehand[MG_E_CYL] = i_cyl; /* we do cylinders */
82			mg_ehand[MG_E_ED] = c_hmaterial; /* they get emission */
83			mg_ehand[MG_E_FACE] = i_face; /* we do faces */
84			mg_ehand[MG_E_MATERIAL] = c_hmaterial; /* they get materials */
85			mg_ehand[MG_E_NORMAL] = c_hvertex; /* they get normals */
86			mg_ehand[MG_E_OBJECT] = i_object; /* we track object names */
87			mg_ehand[MG_E_POINT] = c_hvertex; /* they get points */
88			mg_ehand[MG_E_RD] = c_hmaterial; /* they get diffuse refl. */
89			mg_ehand[MG_E_RS] = c_hmaterial; /* they get specular refl. */
90			mg_ehand[MG_E_SIDES] = c_hmaterial; /* they get # sides */
91			mg_ehand[MG_E_SPH] = i_sph; /* we do spheres */
92			mg_ehand[MG_E_TD] = c_hmaterial; /* they get diffuse trans. */
93			mg_ehand[MG_E_TS] = c_hmaterial; /* they get specular trans. */
94			mg_ehand[MG_E_VERTEX] = c_hvertex; /* they get vertices */
95			mg_ehand[MG_E_XF] = i_xf; /* we track transforms */
96			mg_init(); /* initialize the parser */
97	greg	1.2	/* get options and print format line */
98			for (i = 1; i < argc && argv[i][0] == '-'; i++)
99			if (!strcmp(argv[i], "-vrml"))
100			outtype = O_VRML;
101			else if (!strcmp(argv[i], "-1"))
102			outtype = O_INV1;
103			else if (!strcmp(argv[i], "-2"))
104			outtype = O_INV2;
105			else
106			goto userr;
107			switch (outtype) {
108			case O_INV1:
109			printf("#Inventor V1.0 ascii\n");
110			break;
111			case O_INV2:
112			printf("#Inventor V2.0 ascii\n");
113			break;
114			case O_VRML:
115	greg	1.1	printf("#VRML 1.0 ascii\n");
116	greg	1.2	break;
117			}
118	greg	1.1	printf("## Translated from MGF Version %d.%d\n", MG_VMAJOR, MG_VMINOR);
119			printf("Separator {\n"); /* begin root node */
120			/* general properties */
121			printf("MaterialBinding { value OVERALL }\n");
122	greg	1.2	printf("NormalBinding { value PER_VERTEX_INDEXED }\n");
123			if (outtype != O_INV1) {
124			printf("ShapeHints {\n");
125			printf("\tvertexOrdering CLOCKWISE\n");
126			printf("\tfaceType UNKNOWN_FACE_TYPE\n");
127			printf("}\n");
128			}
129	greg	1.1	if (i == argc) { /* load standard input */
130			if (mg_load(NULL) != MG_OK)
131			exit(1);
132			if (mg_nunknown)
133			printf("## %s: %u unknown entities\n",
134			argv[0], mg_nunknown);
135			}
136			/* load MGF files */
137			for ( ; i < argc; i++) {
138			printf("## %s %s ##############################\n",
139			argv[0], argv[i]);
140			mg_nunknown = 0;
141			if (mg_load(argv[i]) != MG_OK)
142			exit(1);
143			if (mg_nunknown)
144			printf("## %s %s: %u unknown entities\n",
145			argv[0], argv[i], mg_nunknown);
146			}
147	greg	1.3	flush_cache(); /* flush face cache, just in case */
148			printf("}\n"); /* close root node */
149	greg	1.1	exit(0);
150	greg	1.2	userr:
151			fprintf(stderr, "%s: [-1\|-2\|-vrml] [file] ..\n", argv[0]);
152			exit(1);
153	greg	1.1	}
154
155
156			indent(deeper) /* indent in or out */
157			int deeper;
158			{
159			static int level; /* current nesting level */
160			register int i;
161			register char *cp;
162
163			if (deeper) level++; /* in or out? */
164			else if (level > 0) level--;
165			/* compute actual shift */
166			if ((i = level) > MAXIND) i = MAXIND;
167			cp = tabs;
168			for (i *= SHIFTW; i >= TABSTOP; i -= TABSTOP)
169			*cp++ = '\t';
170			while (i--)
171			*cp++ = ' ';
172			*cp = '\0';
173			}
174
175
176			int
177			i_comment(ac, av) /* transfer comment as is */
178			int ac;
179			char **av;
180			{
181			fputs(tabs, stdout);
182			putchar('#'); /* Inventor comment character */
183			while (--ac > 0) {
184			putchar(' ');
185			fputs(*++av, stdout);
186			}
187			putchar('\n');
188			return(MG_OK);
189			}
190
191
192			int
193			i_object(ac, av) /* group object name */
194			int ac;
195			char **av;
196			{
197			static int objnest;
198
199	greg	1.3	flush_cache(); /* flush cached objects */
200	greg	1.1	if (ac == 2) { /* start group */
201	greg	1.2	printf("%sDEF %s Group {\n", tabs, to_id(av[1]));
202	greg	1.1	indent(1);
203			objnest++;
204			return(MG_OK);
205			}
206			if (ac == 1) { /* end group */
207			if (--objnest < 0)
208			return(MG_ECNTXT);
209			indent(0);
210			fputs(tabs, stdout);
211			fputs("}\n", stdout);
212			return(MG_OK);
213			}
214			return(MG_EARGC);
215			}
216
217
218			int
219			i_xf(ac, av) /* transform object(s) */
220			int ac;
221			char **av;
222			{
223			static long xfid;
224			register XF_SPEC *spec;
225
226	greg	1.3	flush_cache(); /* flush cached objects */
227	greg	1.1	if (ac == 1) { /* end of transform */
228			if ((spec = xf_context) == NULL)
229			return(MG_ECNTXT);
230			indent(0); /* close original segment */
231			printf("%s}\n", tabs);
232			indent(0);
233			printf("%s}\n", tabs);
234			if (spec->xarr != NULL) { /* check for iteration */
235			register struct xf_array *ap = spec->xarr;
236			register int n;
237
238			ap->aarg[ap->ndim-1].i = 1; /* iterate array */
239			for ( ; ; ) {
240			n = ap->ndim-1;
241			while (ap->aarg[n].i < ap->aarg[n].n) {
242			sprintf(ap->aarg[n].arg, "%d",
243			ap->aarg[n].i);
244			printf("%sSeparator {\n", tabs);
245			indent(1);
246			(void)put_xform(spec);
247			printf("%sUSE _xf%ld\n", tabs,
248			spec->xid);
249			indent(0);
250			printf("%s}\n", tabs);
251			++ap->aarg[n].i;
252			}
253			ap->aarg[n].i = 0;
254			(void)strcpy(ap->aarg[n].arg, "0");
255			while (n-- && ++ap->aarg[n].i >= ap->aarg[n].n) {
256			ap->aarg[n].i = 0;
257			(void)strcpy(ap->aarg[n].arg, "0");
258			}
259			if (n < 0)
260			break;
261			sprintf(ap->aarg[n].arg, "%d", ap->aarg[n].i);
262			}
263			}
264			/* pop transform */
265			xf_context = spec->prev;
266			free_xf(spec);
267			return(MG_OK);
268			}
269			/* else allocate new transform */
270			if ((spec = new_xf(ac-1, av+1)) == NULL)
271			return(MG_EMEM);
272			spec->xid = ++xfid; /* assign unique ID */
273			spec->prev = xf_context; /* push onto stack */
274			xf_context = spec;
275			/* translate xf specification */
276			printf("%sSeparator {\n", tabs);
277			indent(1);
278			if (put_xform(spec) < 0)
279			return(MG_ETYPE);
280			printf("%sDEF _xf%ld Group {\n", tabs, spec->xid); /* begin */
281			indent(1);
282			return(MG_OK);
283			}
284
285
286			int
287			put_xform(spec) /* translate and print transform */
288			register XF_SPEC *spec;
289			{
290			register char **av;
291			register int n;
292
293			n = xf_ac(spec) - xf_ac(spec->prev);
294			if (xf(&spec->xf, n, av=xf_av(spec)) != n)
295			return(-1);
296			printf("%sMatrixTransform {\n", tabs);
297			indent(1);
298			printf("%s# xf", tabs); /* put out original as comment */
299			while (n--) {
300			putchar(' ');
301			fputs(*av++, stdout);
302			}
303			putchar('\n'); /* put out computed matrix */
304			printf("%smatrix %13.9g %13.9g %13.9g %13.9g\n", tabs,
305			spec->xf.xfm[0][0], spec->xf.xfm[0][1],
306			spec->xf.xfm[0][2], spec->xf.xfm[0][3]);
307			for (n = 1; n < 4; n++)
308			printf("%s %13.9g %13.9g %13.9g %13.9g\n", tabs,
309			spec->xf.xfm[n][0], spec->xf.xfm[n][1],
310			spec->xf.xfm[n][2], spec->xf.xfm[n][3]);
311			indent(0);
312			printf("%s}\n", tabs);
313			return(0);
314			}
315
316
317			int
318			put_material() /* put out current material */
319			{
320	greg	1.3	char *mname = curmatname;
321	greg	1.1	float rgbval[3];
322
323			if (!c_cmaterial->clock) { /* current, just use it */
324	greg	1.3	printf("%sUSE %s\n", tabs, mname);
325	greg	1.1	return(0);
326			}
327			/* else update definition */
328	greg	1.3	printf("%sDEF %s Group {\n", tabs, mname);
329	greg	1.1	indent(1);
330			printf("%sMaterial {\n", tabs);
331			indent(1);
332			mgf2rgb(&c_cmaterial->rd_c, c_cmaterial->rd, rgbval);
333	greg	1.2	printf("%sambientColor %.4f %.4f %.4f\n", tabs,
334	greg	1.1	rgbval[0], rgbval[1], rgbval[2]);
335	greg	1.2	printf("%sdiffuseColor %.4f %.4f %.4f\n", tabs,
336	greg	1.1	rgbval[0], rgbval[1], rgbval[2]);
337			if (c_cmaterial->rs > FTINY) {
338			mgf2rgb(&c_cmaterial->rs_c, c_cmaterial->rs, rgbval);
339	greg	1.2	printf("%sspecularColor %.4f %.4f %.4f\n", tabs,
340	greg	1.1	rgbval[0], rgbval[1], rgbval[2]);
341	greg	1.4	printf("%sshininess %.3f\n", tabs, 1.-sqrt(c_cmaterial->rs_a));
342	greg	1.1	}
343			if (c_cmaterial->ed > FTINY) {
344			mgf2rgb(&c_cmaterial->ed_c, 1.0, rgbval);
345			printf("%semissiveColor %.4f %.4f %.4f\n", tabs,
346			rgbval[0], rgbval[1], rgbval[2]);
347			}
348			if (c_cmaterial->ts > FTINY)
349			printf("%stransparency %.4f\n", tabs,
350			c_cmaterial->ts + c_cmaterial->td);
351			indent(0);
352			printf("%s}\n", tabs);
353	greg	1.2	if (outtype != O_INV1)
354			printf("%sShapeHints { shapeType %s }\n", tabs,
355	greg	1.1	c_cmaterial->sided ? "SOLID" : "UNKNOWN_SHAPE_TYPE");
356			indent(0);
357			printf("%s}\n", tabs);
358			c_cmaterial->clock = 0;
359			return(0);
360			}
361
362
363			int
364			i_face(ac, av) /* translate an N-sided face */
365			int ac;
366			char **av;
367			{
368	greg	1.3	static char lastmat[MAXID];
369			struct face *newf;
370			register C_VERTEX *vp;
371			register LUENT *lp;
372	greg	1.1	register int i;
373
374			if (ac < 4)
375			return(MG_EARGC);
376	greg	1.3	if ( strcmp(lastmat, curmatname) \|\| c_cmaterial->clock \|\|
377			nverts == 0 \|\| nverts+ac-1 >= MAXVERT) {
378			flush_cache(); /* new cache */
379			lu_init(&vert_tab, MAXVERT);
380			printf("%sSeparator {\n", tabs);
381			indent(1);
382			if (put_material() < 0) /* put out material */
383			return(MG_EBADMAT);
384			(void)strcpy(lastmat, curmatname);
385			}
386			/* allocate new face */
387			if ((newf = newface(ac-1)) == NULL)
388			return(MG_EMEM);
389			newf->nv = ac-1;
390	greg	1.1	/* get vertex references */
391	greg	1.3	for (i = 0; i < newf->nv; i++) {
392			if ((vp = c_getvert(av[i+1])) == NULL)
393	greg	1.1	return(MG_EUNDEF);
394	greg	1.3	setvkey(vlist[nverts], vp);
395			lp = lu_find(&vert_tab, vlist[nverts]);
396			if (lp == NULL)
397			return(MG_EMEM);
398			if (lp->key == NULL)
399			lp->key = (char *)vlist[nverts++];
400			newf->vl[i] = ((char (*)[VFLEN])lp->key - vlist);
401	greg	1.1	}
402	greg	1.3	/* add to face list */
403			newf->next = NULL;
404			if (flist == NULL)
405			flist = newf;
406			else
407			flast->next = newf;
408			flast = newf;
409			return(MG_OK); /* we'll actually put it out later */
410	greg	1.1	}
411
412
413			int
414			i_sph(ac, av) /* translate sphere description */
415			int ac;
416			char **av;
417			{
418			register C_VERTEX *cent;
419
420			if (ac != 3)
421			return(MG_EARGC);
422	greg	1.3	flush_cache(); /* flush vertex cache */
423	greg	1.1	printf("%sSeparator {\n", tabs);
424			indent(1);
425			/* put out current material */
426			if (put_material() < 0)
427			return(MG_EBADMAT);
428			/* get center */
429			if ((cent = c_getvert(av[1])) == NULL)
430			return(MG_EUNDEF);
431			/* get radius */
432			if (!isflt(av[2]))
433			return(MG_ETYPE);
434			printf("%sTranslation { translation %13.9g %13.9g %13.9g }\n", tabs,
435			cent->p[0], cent->p[1], cent->p[2]);
436			printf("%sSphere { radius %s }\n", tabs, av[2]);
437			indent(0);
438			printf("%s}\n", tabs);
439			return(MG_OK);
440			}
441
442
443			int
444			i_cyl(ac, av) /* translate a cylinder description */
445			int ac;
446			char **av;
447			{
448			register C_VERTEX v1, v2;
449			FVECT va;
450			double length, angle;
451
452			if (ac != 4)
453			return(MG_EARGC);
454	greg	1.3	flush_cache(); /* flush vertex cache */
455	greg	1.1	printf("%sSeparator {\n", tabs);
456			indent(1);
457			/* put out current material */
458			if (put_material() < 0)
459			return(MG_EBADMAT);
460			/* get endpoints */
461			if ((v1 = c_getvert(av[1])) == NULL \| (v2 = c_getvert(av[3])) == NULL)
462			return(MG_EUNDEF);
463			/* get radius */
464			if (!isflt(av[2]))
465			return(MG_ETYPE);
466			/* compute transform */
467			va[0] = v2->p[0] - v1->p[0];
468			va[1] = v2->p[1] - v1->p[1];
469			va[2] = v2->p[2] - v1->p[2];
470			length = sqrt(DOT(va,va));
471	greg	1.2	angle = acos(va[1]/length);
472	greg	1.1	printf("%sTranslation { translation %13.9g %13.9g %13.9g }\n", tabs,
473			.5(v1->p[0]+v2->p[0]), .5(v1->p[1]+v2->p[1]),
474			.5*(v1->p[2]+v2->p[2]));
475	greg	1.2	printf("%sRotation { rotation %.9g %.9g %.9g %.9g }\n", tabs,
476			va[2], 0., -va[0], angle);
477	greg	1.1	/* open-ended */
478			printf("%sCylinder { parts SIDES height %13.9g radius %s }\n", tabs,
479			length, av[2]);
480			indent(0);
481			printf("%s}\n", tabs);
482			return(MG_OK);
483	greg	1.2	}
484
485
486			char *
487			to_id(name) /* make sure a name is a valid Inventor ID */
488			register char *name;
489			{
490	greg	1.3	static char id[MAXID];
491	greg	1.2	register char *cp;
492
493	greg	1.3	for (cp = id; *name && cp < MAXID-1+id; name++)
494	greg	1.2	if (isalnum(name) \|\| name == '_')
495			cp++ = name;
496			else
497			*cp++ = '_';
498			*cp = '\0';
499			return(id);
500	greg	1.3	}
501
502
503			flush_cache() /* put out cached faces */
504			{
505			int donorms = 0;
506			register struct face *f;
507			register int i;
508
509			if (nverts == 0)
510			return;
511			/* put out coordinates */
512			printf("%sCoordinate3 {\n", tabs);
513			indent(1);
514			vlist[0][VFSEPPOS] = '\0';
515			printf("%spoint [ %s", tabs, vlist[0]);
516			for (i = 1; i < nverts; i++) {
517			vlist[i][VFSEPPOS] = '\0';
518			printf(",\n%s %s", tabs, vlist[i]);
519			if (strcmp(VFSEPPOS+1+vlist[i], VZVECT))
520			donorms++;
521			}
522			indent(0);
523			printf(" ]\n%s}\n", tabs);
524			if (donorms) { /* put out normals */
525			printf("%sNormal {\n", tabs);
526			indent(1);
527			printf("%svector [ %s", tabs, VFSEPPOS+1+vlist[0]);
528			for (i = 1; i < nverts; i++)
529			printf(",\n%s %s", tabs, VFSEPPOS+1+vlist[i]);
530			indent(0);
531			printf(" ]\n%s}\n", tabs);
532			}
533			/* put out faces */
534			printf("%sIndexedFaceSet {\n", tabs);
535			indent(1);
536			f = flist; /* coordinate indices */
537			printf("%scoordIndex [ %d", tabs, f->vl[0]);
538			for (i = 1; i < f->nv; i++)
539			printf(", %d", f->vl[i]);
540			for (f = f->next; f != NULL; f = f->next) {
541			printf(", -1,\n%s %d", tabs, f->vl[0]);
542			for (i = 1; i < f->nv; i++)
543			printf(", %d", f->vl[i]);
544			}
545			printf(" ]\n");
546			if (donorms) {
547			f = flist; /* normal indices */
548			printf("%snormalIndex [ %d", tabs, f->vl[0]);
549			for (i = 1; i < f->nv; i++)
550			printf(", %d", f->vl[i]);
551			for (f = f->next; f != NULL; f = f->next) {
552			printf(", -1,\n%s %d", tabs, f->vl[0]);
553			for (i = 1; i < f->nv; i++)
554			printf(", %d", f->vl[i]);
555			}
556			printf(" ]\n");
557			}
558			indent(0); /* close IndexedFaceSet */
559			printf("%s}\n", tabs);
560			indent(0); /* close face group */
561			printf("%s}\n", tabs);
562			while ((f = flist) != NULL) { /* free face list */
563			flist = f->next;
564			freeface(f);
565			}
566			lu_done(&vert_tab); /* clear lookup table */
567			nverts = 0;
568	greg	1.1	}