[vtkusers] Add a plan to a vtkPolyData

[David Gobbi]

Also, you should use vtkCleanPolyData after the append to remove any
duplicated points.  This is necessary in order to properly establish
the connectivity after doing the append.

   David


On Wed, Jan 27, 2010 at 8:15 AM, Michael Jackson
<mike.jackson at bluequartz.net> wrote:
> vtkAppendDataset and its decedents.
> ___________________________________________________________
> Mike Jackson                      www.bluequartz.net
> Principal Software Engineer       mike.jackson at bluequartz.net
> BlueQuartz Software               Dayton, Ohio
>
>
> On Jan 27, 2010, at 10:12 AM, Frantch 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
>> --
>> View this message in context:
>> http://old.nabble.com/Add-a-plan-to-a-vtkPolyData-tp27341078p27341078.html
>> Sent from the VTK - Users mailing list archive at Nabble.com.
>>
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