[vtkusers] Different alpha values for scalars

[Sebastian Gatzka]

Hello world.

Do you know if it's possible to assign different alpha values to a 
scalar field representation (for example on a cutting plane)?

I want to have scalar to be more transparent if they are below some 
defined threshold.
For example something like this

    * scalar < 0.1 : alpha = 0.3
    * 0.1 < scalar < 0.5 : alpha = 0.7
    * scalar > 0.5 : alpha = 1.0

Do you know how I can manage this?

Sebastian

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