[vtkusers] Extract Polydata points with same scalar value

[Jochen K.]

Hi Sara,

you may try to separate your polydata by scalar values using a
vtkThresholdPoints object:


untested snippet:
         //...
         vtkSmartPointer<vtkThresholdPoints> threshold =
vtkSmartPointer<vtkThresholdPoints>::New();
         threshold.SetInput(contourPolydata);
         threshold.SetInputArrayToProcess(
            0,
            0,
            vtkDataObject::FIELD_ASSOCIATION_POINTS,
            vtkDataSetAttributes::SCALARS,
            "NameOfYourScalarArray");
         threshold->ThresholdBetween(0, 1); // would give you the points
labeled with 1
         // you may have to experiment with the value range a bit
         //threshold->ThresholdBetween(1, 2); // would give you the
points labeled with 2

         threshold->Update();

         vtkSmartPointer<vtkPolyData> part =
vtkSmartPointer<vtkPolyData>::New();
         part->SetInputConnection(threshold->GetOutputConnection());
         //...


best regards

Jochen

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