[vtkusers] Polydata input to filter is not set

[Nico Schertler]

Hi Alex,

to answer your questions. Of course, I provided input to the Delaunay filter. But because this is not directly connected to the problem and it would require introduction to some other classes and so on, I decided to omit this in the question. But I stated that the filter has an output which I could render. Furthermore, I am able to work on the output (as I would do in the filter) and produce a vtkImageData directly (without the filter). So there must be something wrong with passing the output to the filter.
I will implement the static New() if everything else works. For now, it is just a test class.

Nico

Von: vtkusers-bounces at vtk.org [mailto:vtkusers-bounces at vtk.org] Im Auftrag von Alex Malyushytskyy
Gesendet: Mittwoch, 21. November 2012 23:34
An: vtkusers at vtk.org
Betreff: Re: [vtkusers] Polydata input to filter is not set

There is no enough information in your post to reproduce or understand  the problem.
For example I believe there are cases when vtkDelaunay2D
will produce empty output.
More of that it is not even clear that you provide any input to vtkDelaunay2D and update it.
And I am not great in guessing.

What I would highly recommend, if you derive class from vtk class,
follow the vtk guidelines.
If you did this you would never be able to write:
MeshToRGBFilter* rgbFilter = new MeshToRGBFilter();

Alex

On Wed, Nov 21, 2012 at 2:02 AM, Nico Schertler <nico.schertler at studentpartners.de<mailto:nico.schertler at studentpartners.de>> wrote:
Hi,

I am creating a filter that takes the result of a vtkDelaunay2D and creates a vtkImageData from that. Therefore, I chose the vtkImageAlgorithm as the base class for my filter and changed the input accordingly:

int MeshToRGBFilter::FillInputPortInformation(int port, vtkInformation* info)
{
       info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkPolyData");
       return 1;
}

I connect the filter to a vtkDelaunay2D like this:

vtkSmartPointer<vtkDelaunay2D> delaunay = vtkSmartPointer <vtkDelaunay2D>::New();
//...
MeshToRGBFilter* rgbFilter = new MeshToRGBFilter();
rgbFilter->SetInputConnection(delaunay->GetOutputPort());

The Delaunay filter definitely has an output. I confirmed that by rendering it.
In the filter, in RequestData, I want to access the polydata from the Delaunay pass like this:

int MeshToRGBFilter::RequestData(
       vtkInformation *vtkNotUsed(request),
       vtkInformationVector **inputVector,
       vtkInformationVector *outputVector)
{
       vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
       vtkPolyData* input = vtkPolyData::SafeDownCast(
             inInfo->Get(vtkDataObject::DATA_OBJECT()));

The input variable is then set to an instance of a vtkPolyData, but it contains just nothing:
[cid:image001.png at 01CDC842.A1A38F60]

Is there something I might have missed? How can I access the poly data?

Nico

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