[vtkusers] How to render the contours of a binary image?

[Dominik Szczerba]

See vtkDiscreteMarchingCubes.
What I also do at times is to cast the binary image to float, smooth
it, and then extract 0.5 value.

On Tue, May 31, 2011 at 1:19 PM, Thomas Kilgus
<t.kilgus at dkfz-heidelberg.de> wrote:
> Hi,
>
> I am using a vtkPolyDataMapper to render images as a texture on a plane.
> Some images (in the form of vtkImageData) just consist of the values 1.0 and
> 0.0. By means of a vtkLookuptable I can easily render those images with a
> single color (the 1.0 values) and with a transparent background (0.0
> values). What would be the best way to render just the contours of those
> images?
>
> I already found the vtkContourFilter. But when I use it like this:
>
>      vtkSmartPointer<vtkContourFilter> contourFilter =
> vtkSmartPointer<vtkContourFilter>::New();
>      contourFilter->SetInput(image);
>      contourFilter->GenerateValues(1, 1.0, 1.0);
>      contourFilter->Update();
>      texture->SetInputConnection(contourFilter->GetOutputPort());
>
> the whole image is just rendered as a single color.
>
> Is there anything wrong with my code or is the vtkContourFilter just not the
> appropriate filter for my task?
>
> regards
> thomas kilgus
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