@Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = im.getCapsule(this);
        size = ic.readInt("patchSize", 32);
        lodMultiplier = ic.readFloat("lodMultiplier", 32f);
    }
Calculates the LOD of the terrain based on its distance from the
cameras. Taking the minimum distance from all cameras.

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