[vtkusers] how to update pipeline after changing isovalue in vtkMarchingCubes.

[David Feng]

The normal VTK way of doing this is to instantiate a single pipeline
and modify only the existing objects (meaning that you shouldn't
create a new vtkMarchingCubes object).  So when you want to change the
isovalue, just call:

marchingCubes->SetIsovalue(...);
marchingCubes->Update();
renderWindow->Render();

The update should propagate down the pipeline and update everything
that needs to get updated.

David

On Fri, Feb 12, 2010 at 9:06 AM, Liam Kurmos
<quantum.leaf at googlemail.com> wrote:
> I render a contour with vtkMarchingCubes.
> I detect a keypress and the handling function creates a new instance
> of vtkMarchingCubes with a different isovalue.
> I call contourActor->GetMapper()->GetInput()->Update();
> but i don't see any change (the old contour is still being rendered).
> Do i need to somehow stop the interactor before i can update? or do i
> need to update something else?
>
> Liam
>
> ps:
> I fixed the problem i was having getting an interactorstyle
> to work as an external class while having a reference to the calling class.
> (i needed to #include the calling class in the .cpp file of the
> interactor not the .h)
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