@Override
    public void write(JmeExporter ex) throws IOException {
        super.write(ex);
        OutputCapsule capsule = ex.getCapsule(this);
        capsule.writeSavableArrayList(children, "children", new ArrayList<ChildCollisionShape>());
    }
WARNING - CompoundCollisionShape scaling has no effect.
jme3-jbullet/src/main/java/com/jme3/bullet/collision/shapes/CompoundCollisionShape.java