[vtkusers] Artifacts with opacity

[Alejandro F. Frangi]

Hi all,

 I'm rendering a vtkPolyData set and after i map it with a
PolyDataMapper I want to select give the surface (actor) a given
opacity. Now, if the opacity is unitary there are noproblems. As soon as
I use a smaller opcaity I get funny rendering artifacts when interacting
with the object. Does anybody know the reason of this and how can be
solved? I tried by recomputing the normals before rendering but this
does not make any difference.


 Alex