}
    private static GLUtessellator _tess = null;
    private static GLUtessellator _newTess() {
        GLUtessellator tess = GLUtessellatorImpl.gluNewTess();
        GLUtessellatorCallbackAdapter tessCb = new GLUtessellatorCallbackAdapter() {
            @Override
            public void begin(int type) {
                GL11.glBegin(type);
            }