[vtkusers] can't update contourFilter unless i do contourFilter->SetValue(, )

Liam Kurmos quantum.leaf at googlemail.com
Sun Jun 13 18:16:41 EDT 2010

Hi All,

I was disappinted to get no responses. Was my question unclear? please
let me know.

i want to know:

How can i force the update of my vtkContourFilter output after i
modify the vtkImageData,( other than by calling
vtkContourFilter->SetValue() and changing the isovalue)?



On Thu, Jun 10, 2010 at 4:16 PM, Liam Kurmos
<quantum.leaf at googlemail.com> wrote:
> I'm trying to create an interactive tool to help me get isosurfaces
> from gaussian data.
> Ive created an interactorStyle and have no problem getting interaction
> from the user.
> From the interactor i can change the data in my vtkImageData which was
> previously set as input for the vtkContourFilter, however the changes
> are not passed through to the render window.
> I've called update() on the everything i can think of:
> vtkImageData->Update(), vtkContourFilter->Update() the mapper etc.
> but nothing seems to propagate the changes in the imageData through to
> the renderWindow.
> UNLESS i call contourFilter->SetValue(a,b) and change the current
> isovalue in which case the contours update reflecting the changes i
> immediately without needing to call update on anything.
> So my question is, How can i get this effect without changing the iso value?
> Liam

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