[vtkusers] Newbie, about Opacity

[rnelias at nacad.ufrj.br]

You're right Cameron, that must be the problem. VTK has a pipeline model based
on "lazy evaluation", so, after every change you need to call a xxxx->update()
in order to see the changes.

[]'s

Renato.

Quoting Cameron Burnett <w_e_b_m_a_s_t_e_r_6_9 at hotmail.com>:

> That could possibly be a problem if you change the opacity after
> renWin->Render() . In my MFC program I am just changing the opacity of the
> actors with a button, using this line....
>
> actor->GetProperty()->SetOpacity(newOpacity);
>
> .... and then I have to update the render window after that, otherwise it
> won't redraw the changes.
>
>
> Hope that helps. If not then you might want to show a bit of your code so we
> can have a look.
>
>
> Regards,
> Cameron.
>
>
>
> Date: Thu, 17 Apr 2008 20:29:34 -0500
> From: rax20037 at gmail.com
> To: vtkusers at vtk.org
> Subject: [vtkusers] Newbie, about Opacity
>
> Hello!
>
> I changed the code in Cone4 from the Tutorial, to the Actor 2 I set many
> opacity levels, but the graphics are still fully visble, non transparent.
> What else I need to do. In a presentation I read that the transparent actors
> must be the last added, that's why I sete actor 2, but doesn't work :S
>
> Help please
>
>
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