@Override
    public void write(JmeExporter ex) throws IOException {
        OutputCapsule oc = ex.getCapsule(this);
        oc.write(size, "size", 16);
        oc.write(lodMultiplier, "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