NAME
	  DtGroupGetVertices - Get a list of vertices for the given
	  group.


     SYNOPSIS
	  #include <Dt.h>


	  int  DtGroupGetVertices( int shapeID,	int groupID, int *count, DtVec3f **vertices )


     DESCRIPTION
	  DtGroupGetVertices() returns a vertex	list for the group
	  indicated by the given shapeID and groupID. The number of
	  vertices is returned in count. A pointer to a	list of	the
	  vertices is placed in	the variable pointed to	by vertices.
	  The array returned by	DtGroupGetVertices() is	not an
	  internal array, and must be freed by the calling function.
	  It may be modified, but will not change data stored in the
	  model.  C programmers	can access the components of the
	  vertex array as though it were a simple structure as
	  follows:

		    typedef struct DtVec3f { float vec[3];};

		    DtVec3f *verts;
		    DtGroupGetVertices(	groupID, DtVec3f &verts	);
		    /* The first vertex	*/
		    x =	verts[0].vec[0];
		    y =	verts[0].vec[1];
		    z =	verts[0].vec[2];


     DIAGNOSTICS
	  DtGroupGetVertices() returns one on success and zero on
	  failure.


     FILES
	  Link with -lDtOMio