[vtkusers] planeWidget (toggle) & volume render issue

[Marius S Giurgi]

Is there a way to have volume and planeWidget work together fine?
It looks like the render order is not preserved while toggling the 
planeWidget back and forth. While it displays perfectly fine at the 
beginning, if toggled (off) and (on) the widget hides the volume. Why? 
I'm sure it must be something to do with the depth ordering (again). Is 
there a way to avoid this effect and have the volume in front of the 
widget?

I wish someone finally found a solution to this annoying issue of 
getting the proper depth ordering for poly+volume rendering.

marius