Making a model turn transparent?

I was wondering if it is possible to make a model gradually turn transparent.

If so could you possibly point me in the direction of a post / manual page that would best get me started on this. Thanks!

model.setTransparency(TransparencyAttrib.MAlpha)
i = model.colorScaleInterval(2, VBase4(1, 1, 1, 0))
i.start()