@Override
    public String toString() {
        return getClass().getSimpleName() + " [Normal: " + normal + " - Constant: "
                + constant + "]";
    }
<code>toString</code> returns a string representation of this plane.
It represents the normal as a <code>Vector3f</code>, so the format is:

Plane [Normal: (X.XXXX, Y.YYYY, Z.ZZZZ) - Constant: C.CCCC]

@return the string representation of this plane.
jme3-core/src/main/java/com/jme3/math/Plane.java