[vtkusers] Convert vtkImageData to vtkPolyData

[Bill Lorensen]

Try
vtkImageDataGeometryFilter

On Mon, Nov 19, 2012 at 6:42 AM, Boehm, Lukas <Lukas.Boehm at cellent.de> wrote:
> Hello,
>
>
>
> I’ve got the following situation: In the past I had to visualize some
> isolines with vtkMarchingSquares filter. The input data for this filter was
> a vtkImageData object. The vtkAlgorithmOutput object, which is generated by
> vtkMarchingSquares, was clipped by using vtkExtractPolyDataGeometry.
>
>
>
> So the pipeline was: vtkImageData => vtkMarchingSquares =>
> vtkExtractPolyDataGeometry
>
>
>
>
>
> Now I want to visualize the same data as a heatmap. So I take the image data
> and pass it to vtkDataSetMapper for visualization. The pipeline is:
> vtkImageData => vtkDataSetMapper
>
>
>
> This works also fine. Now I want to clip this heatmap, like I did with the
> output from vtkMarchingSquares. But I get the following error when using
> vtkExtractPolyDataGeometry:
>
>
>
> ERROR: In
> ..\..\..\..\vtksource-prefix\src\vtksource\Filtering\vtkDemandDrivenPipeline.cxx,
> line 827
>
> vtkStreamingDemandDrivenPipeline (188AEF28): Input for connection index 0 on
> input port index 0 for algorithm vtkExtractPolyDataGeometry(188AEEC8) is of
> type vtkImageData, but a vtkPolyData is required.
>
>
>
> Pipeline is here: vtkImageData => vtkExctractPolyDataGeometry =>
> vtkDataSetMapper
>
>
>
> So it tells me, I’ve got to convert the vtkImageData to vtkPolyData. Is this
> right? How can I convert this?
>
>
>
> If you did not understand my problem, feel free to ask. I’ll try to explain
> it better J
>
>
>
> Kind regards,
>
> Lukas
>
>
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