public VbHandle CreateHandle( int numVertices )
 {
     FreeRange range = GetFreeRange( numVertices );
     VbHandle handle = new VbHandle( this, range.Start, range.Size );
     m_Handles.Add( handle );
     return handle;
 }
 /// <summary>
 /// Releases a VB handle
 /// </summary>
 private void ReleaseHandle( VbHandle handle )
 {
     if ( m_Handles.Remove( handle ) )
     {
         m_FreeList.Add( new FreeRange( handle.FirstVertexIndex, handle.VertexCount ) );
     }
 }