@Override
    public DistanceLodCalculator clone() {
        DistanceLodCalculator clone = new DistanceLodCalculator(size, lodMultiplier);
        return clone;
    }
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