@Override
    public Quaternion clone() {
        try {
            return (Quaternion) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new AssertionError(); // can not happen
        }
    }
Creates a copy. The current instance is unaffected.

@return a new instance, equivalent to the current one
jme3-core/src/main/java/com/jme3/math/Quaternion.java