[vtkusers] Add a plan to a vtkPolyData

[Frantch]

Amazing :p

Yep, it works the polyData are combined AND the computations I do after work
too !

Thank you,
Francesco


David Doria-2 wrote:
> 
> On Wed, Jan 27, 2010 at 10:12 AM, Frantch <le_maitre at bluewin.ch> wrote:
>>
>> Hello everybody,
>>
>> I would like to know how can I add a plane to a polydata ? because ehre
>> what
>> I'm trying to do:
>>
>> I have a PolyData that I clip using vtkClipPolyData (clipping function =
>> ONE
>> plane). I manage to clip it and to display the clipped part.
>> Unfortunately
>> this clipped polydata
>> has a missing plane... (the one who has been used to clip..) So as I
>> result
>> I don't have a close polydata and.. it make wrong the calculation that
>> I'm
>> doing after..
>>
>> So here what I did to create the missing plane: I use vtkCutter but
>> vtkCutter creates lines where the cut function intersects the polydata.
>> So I
>> will use
>> vtkStrippers then to puts them together into polylines. I then pull a
>> trick
>> and define polygons using the closed line segements that the stripper
>> created..
>>
>> vtkCutter * cutEdges = vtkCutter::New();
>>
>> cutEdges->SetInput(myPolyData);
>> cutEdges->SetCutFunction(plane);
>> cutEdges->GenerateCutScalarsOn();
>> cutEdges->SetValue(0, 0.5);
>>
>> vtkStripper * cutStrips = vtkStripper::New();
>>
>>
>> cutStrips->SetInputConnection(cutEdges->GetOutputPort());
>> cutStrips->Update();
>> vtkPolyData * cutPoly = vtkPolyData::New();
>> cutPoly->SetPoints(cutStrips->GetOutput()->GetPoints());
>> cutPoly->SetPolys(cutStrips->GetOutput()->GetLines());
>>
>> // Triangle filter is robust enough to ignore the duplicate point at
>> // the beginning and end of the polygons and triangulate them.
>> vtkTriangleFilter * cutTriangles = vtkTriangleFilter::New();
>> cutTriangles->SetInput(cutPoly);
>> cutTriangles->Update();
>>
>> so cutTriangles is my missing plane.. How can I add that to my clipped
>> polyData ?
>>
>> Regards,
>> Francesco
> 
> If I read that correctly, the problem boils down to simply wanting to
> combine two polydata's, correct? If so, you can use the
> vtkAppendPolyDataFilter:
> http://www.vtk.org/Wiki/VTK/Examples/CombinePolydata
> 
> Let us know if that does what you need.
> 
> Thanks,
> 
> David
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