@Override
    @SuppressWarnings("unchecked")
    public void write(JmeExporter exporter) throws IOException {
        super.write(exporter);
        OutputCapsule capsule = exporter.getCapsule(this);
        capsule.write(approximateTangents, TAG_APPROXIMATE, true);
        capsule.writeSavableArrayList(new ArrayList(targets), TAG_TARGETS, null);
    }
Serialize this Control to the specified exporter, for example when saving
to a J3O file.

@param exporter (not null)
@throws IOException from the exporter
jme3-core/src/main/java/com/jme3/anim/MorphControl.java