See the following code segment near the top of NGRegion.java:

    // We create a class instance of a no op. Effect internally to handle 3D
    // transform if user didn't use Effect for 3D Transformed Region. This will
    // automatically forces Region rendering path to use the Effect path.
    //TODO: We should use back Offset effect once its rendering bug is fixed. (RT-16593)
    // private static Offset nopEffect = new Offset(0, 0, null);
    private static BoxBlur nopEffect = new BoxBlur();