@Override
    public Plane clone() {
        try {
            Plane p = (Plane) super.clone();
            p.normal = normal.clone();
            return p;
        } catch (CloneNotSupportedException e) {
            throw new AssertionError();
        }
    }
Create a copy of this plane.

@return a new instance, equivalent to this one
jme3-core/src/main/java/com/jme3/math/Plane.java