public int clear()
    {
        int n = 0;
        for (GVRCursorController c : controllers)
        {
            c.stopDrag();
            removeCursorController(c);
            ++n;
        }
        return n;
    }
public int clear ( ) { int n = 0 ; for ( GVRCursorController c : controllers ) { c . stopDrag ( ) ; removeCursorController ( c ) ; ++ n ; } return n ; }
Remove all controllers but leave input manager running.
@return number of controllers removed