[vtkusers] Opacity with multiple meshes

[Nicolas Rannou]

Hello,

I have several meshes I want to visualize.

If I decrease the opacity of those meshes, the visualization goes wrong:
I don't see a nice "superposition effect", instead I only see the "last"
object "in the ray".

Decreasing the opacity,
- paraview has the expected behavior
- the vtk example (
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Opacity) has the
wrong behavior.

I could find which option to use to enable a proper behavior...

Thanks,
Nicolas
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