wind barbs

Hello.

In the visad javadoc there are some methods that pertain to wind barbs.
These methods include:

BarbManipulationRendererJ2D 
BarbManipulationRendererJ3D 
BarbRendererJ2D 
BarbRendererJ3D 

Does anyone have code that actually displays wind barbs with visad using
these methods? If yes, could someone send me some examples of such code? 

I was unable to find any examples in the visad source code examples
directory.


Thank you for your help.
--
Julien