@Override
    public MatParam clone() {
        try {
            MatParam param = (MatParam) super.clone();
            return param;
        } catch (CloneNotSupportedException ex) {
            throw new AssertionError();
        }
    }
Returns the material parameter value as it would appear in a J3M
file. E.g.
<pre>
MaterialParameters {
    ABC : 1 2 3 4
}
</pre>
Assuming "ABC" is a Vector4 parameter, then the value
"1 2 3 4" would be returned by this method.

@return material parameter value as it would appear in a J3M file.
jme3-core/src/main/java/com/jme3/material/MatParam.java