[vtkusers] get points of a cutter

[Eddy Cappeau]

You're rigth.

It works fine now.

Thanks.

Eddy

----

    Date: Fri, 5 Feb 2010 10:15:53 +0000
    From: KS Jothybasu<jothybasu at gmail.com>
    Subject: Re: [vtkusers] get points of a cutter
    To: David Doria<daviddoria+vtk at gmail.com>
    Cc:vtkusers at vtk.org
    Message-ID:
    	<1dd3c8b21002050215h6767849bqcc8b96d00512307a at mail.gmail.com>
    Content-Type: text/plain; charset="iso-8859-1"

    I am bale to get the points like this

    cutter=vtk.vtkCutter()
             cutter.SetCutFunction(plane)
             cutter.SetInput(vtkObject.GetOutput())
             cutter.Update()

             out=cutter.GetOutput()
             points=out.GetPoints()
             NumPts=points.GetNumberOfPoints()
             #print NumPts
             OutlinePts=np.zeros([NumPts,3])
             for n in range(0,NumPts,1):
                 OutlinePts[n,:]=np.round(points.GetPoint(n))


    As David said, you have to call the Update method.

    Jothy

    On Thu, Feb 4, 2010 at 7:04 PM, David Doria
    <daviddoria+vtk at gmail.com<daviddoria%2Bvtk at gmail.com>
       

>     >  wrote:
>          
>     >
>     >
>     >  On Thu, Feb 4, 2010 at 11:46 AM, Eddy Cappeau<ecappeau at phenix-systems.com
>          
>>     >  >  wrote:
>>            
>     >
>          
>>     >>  Hi,
>>     >>
>>     >>  I'm new to VTK and I'v got a little problem with it.
>>     >>  I want to cut a mesh with a plane and get the polyline of the
>>     >>  intersection.
>>     >>  The mesh come from a stl file loaded like this :
>>     >>
>>     >>      vtkSmartPointer<vtkSTLReader>  reader =
>>     >>  vtkSmartPointer<vtkSTLReader>::New();
>>     >>      reader->SetFileName("myfile.stl");
>>     >>
>>     >>      vtkSmartPointer<vtkPolyDataMapper>  stlMapper =
>>     >>  vtkSmartPointer<vtkPolyDataMapper>::New();
>>     >>      stlMapper->SetInputConnection(reader->GetOutputPort());
>>     >>
>>     >>  I create a cutter like this :
>>     >>
>>     >>      vtkCutter * sliceCutter = vtkCutter::New();
>>     >>      sliceCutter->SetInput( reader->GetOutput() );
>>     >>      vtkPlane *slicePlane = vtkPlane::New();
>>     >>      slicePlane->SetOrigin(0.0,0.0,7.0);
>>     >>      slicePlane->SetNormal(0.0,0.0,1.0);
>>     >>
>>     >>      sliceCutter->SetCutFunction( slicePlane );
>>     >>
>>     >>  I'v created a mapper and an actor for the mesh and the section, and i can
>>     >>  visualize them both.
>>     >>
>>     >>  So I try to retrieve the points like this :
>>     >>
>>     >>      vtkPolyData * testdata = sliceCutter->GetOutput();
>>     >>      vtkPoints * points = sliceCutter->GetOutput()->GetPoints();
>>     >>      int n = points->GetNumberOfPoints();
>>     >>
>>     >>  But the vtkPoints is always NULL and  I don't understand why.
>>     >>  How can I get those points ?
>>     >>
>>     >>  thanks.
>>     >>  _____
>>            
>     >
>     >
>     >  Sounds like you need to call Update on the cutter
>     >  sliceCutter->Update();
>     >
>     >  Let me know if that works.
>     >
>     >  Thanks,
>     >
>     >  David
>     >
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