[vtkusers] Calculating an obvious point's normal

[tony hakki]

Dear vtk users;
I have a surface coordinate (like P(x,y,z)) of a 3D object. I would like to calculate just this point's normal.  By means of the following code I think I get all point's normals? Then how can I get the P(x,y,z) 's normal? I mean that ,I just want to get point's normal which is specified by me. best regards

vtkPolyDataNormals *dataset = vtkPolyDataNormals::New();
	dataset->SetInput(reader1->GetOutput());
	dataset->SetFeatureAngle(60.0);
	dataset->FlipNormalsOff();
	dataset->Update();

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