NAME
	  DtGroupGetNormal - Get a normal for the given	group and
	  normal index.


     SYNOPSIS
	  #include <Dt.h>


	  int  DtGroupGetNormal( int shapeID, int groupID, int index, DtVec3f *normal )


     DESCRIPTION
	  DtGroupGetNormal() returns a normal for the group indicated
	  by the given shapeID,	groupID	and index. The noraml 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 norm;
		    x =	norm.vec[0];
		    y =	norm.vec[1];
		    z =	norm.vec[2];



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


     FILES
	  Link with -lDtOMio