@Override
    public void read(final JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        terrain = (Terrain) ic.readSavable("terrain", null);
        lodCalculator = (LodCalculator) ic.readSavable("lodCalculator", new DistanceLodCalculator());
        useRenderCamera = ic.readBoolean("useRenderCamera", false);
    }
Calculates the LOD of all child terrain patches.
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainLodControl.java