- for example,

    defaultFieldValues
    (
        areaScalarFieldValue h 0.00014
    );

    regions
    (
        clipPlaneToFace
        {
            point  (0 0 0);
            normal (1 0 0);

            fieldValues
            (
                areaScalarFieldValue h 0.00015
            );
        }
    );

ENH: additional clipPlaneTo{Cell,Face,Point} topo sets

- less cumbersome than defining a semi-infinite bounding box