@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        terrain = (TerrainQuad) ic.readSavable("terrain", null);
    }
Called internally by com.jme3.util.clone.Cloner.  Do not call directly.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/NormalRecalcControl.java