@Override
    public void read(JmeImporter importer) throws IOException {
        InputCapsule capsule = importer.getCapsule(this);
        center = (Vector3f) capsule.readSavable("center", Vector3f.ZERO.clone());
        up = (Vector3f) capsule.readSavable("up", Vector3f.UNIT_Z.clone());
        innerRadius = capsule.readFloat("innerRadius", 0f);
        outerRadius = capsule.readFloat("outerRadius", 1f);
    }
De-serialize this ring from the specified importer, for example
when loading from a J3O file.

@param importer (not null)
@throws IOException from the importer
jme3-core/src/main/java/com/jme3/math/Ring.java