@Override
    public Geometry clone(boolean cloneMaterial) {
        return (Geometry) super.clone(cloneMaterial);
    }
This version of clone is a shallow clone, in other words, the
same mesh is referenced as the original geometry.
Exception: if the mesh is marked as being a software
animated mesh, (bind pose is set) then the positions
and normals are deep copied.
jme3-core/src/main/java/com/jme3/scene/Geometry.java