NAME
	  DtGroupGetVertex - Get a vertex for the given	group and
	  vertex number.


     SYNOPSIS
	  #include <Dt.h>


	  int  DtGroupGetVertex( int shapeID, int groupID, int index, DtVec3f *vertex )


     DESCRIPTION
	  DtGroupGetVertex() returns a vertex for the group indicated
	  by the given shapeID,	groupID	and index. The vertex is
	  returned via the pointer to the vertex parameter.  C
	  programmers can access the components	of the vertex vector
	  as though it were a simple structure as follows:

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

		    DtVec3f vert;
		    x =	vert.vec[0];
		    y =	vert.vec[1];
		    z =	vert.vec[2];



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


     FILES
	  Link with -lDtOMio