[vtkusers] After a threshold need render opacity.

[Amy Squillacote]

Francois Louis LAILLIER wrote:
>
> Hello vtkusers.
>
> I create a volume with binary files, I threshold it, now I want render 
> the black pixel transparent.
>
> I think If I put their opacity = 0, I will have the good result.
>
> But I don’t understand argument of vtkpieceswises
>
> When we add a new point like : opacitytransferfunction.addpoint(a,b)
>
> What are the two arguments?
>
The first argument is the scalar value whose opacity you want to modify.
The second argument is the opacity at the specified scalar value.

- Amy
>
> Do you think that it is possible to render transparent the black 
> pixels, and are they invisible on every rotation?
>
> Best regards, Francois Louis.
>
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-- 
Amy Squillacote
Kitware, Inc.
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Phone: (518) 371-3971 x106