public void setMaterialExtensionSet(MaterialExtensionSet matExts) {
        this.matExts = matExts;
    }
Set the {@link MaterialExtensionSet} to use for mapping base materials to
jME3 matdefs when loading. Set to
<code>null</code> to disable this functionality.

@param matExts The {@link MaterialExtensionSet} to use
jme3-plugins/src/ogre/java/com/jme3/scene/plugins/ogre/matext/OgreMaterialKey.java