@Override
    protected void createSpatialData(Spatial spat) {
        rigidBody.setUserObject(spatial);
    }
Create spatial-dependent data. Invoked when this control is added to a
spatial.

@param spat the controlled spatial (not null, alias created)
jme3-jbullet/src/main/java/com/jme3/bullet/control/BetterCharacterControl.java