public class VirtualMeasurementUniverse extends SimpleUniverse
{

    //Singleton object of universe
    private static VirtualMeasurementUniverse a_oVirtualMeasurementUniverse = null;
    
    /**
     * create (if necessary) and return singleton object of universe
     * @return singleton object of the universe  
     */
    public static VirtualMeasurementUniverse getUniverse()
    {
        //create universe (if necessary)
        if (a_oVirtualMeasurementUniverse == null) 
        {
        	a_oVirtualMeasurementUniverse = new VirtualMeasurementUniverse();
       	}
        
        return a_oVirtualMeasurementUniverse;
    }
    
    /**
     * constructor
     */
    private VirtualMeasurementUniverse()
    {
        //create universe with off-screen canvas for production and on-screen canvas for debugging:
        super(new Canvas3D(SimpleUniverse.getPreferredConfiguration(), (GlobalSwitches.DEBUG ? false : true)));
        //set high thread priority for geometry actions:
        VirtualUniverse.setJ3DThreadPriority(Thread.MAX_PRIORITY);
    }

}