@Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = im.getCapsule(this);
        size = ic.readInt("size", 16);
        lodMultiplier = ic.readInt("lodMultiplier", 2);
    }
Just multiplies the terrain patch size by 2. So every two
patches away the camera is, the LOD changes.

Set it higher to have the LOD change less frequently.

@author bowens
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/lodcalc/SimpleLodThreshold.java