Re: isosurface update issue

I did it in the way you recommended, David. The old ones are still there.
rederWindow->Render() and QVTKOpenGLWidget->update() are added
as well. No help. VTK version 8.1.

void MyApp::redraw( const double value )
{
    if ( m_pActor != nullptr )
    {
          renderer->RemoveActor(m_pActor );
          m_pActor->Delete();
          m_pActor = nullptr;
    }

    m_pActor = vtkActor::New();
    vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetScalarRange(0.0, 1.0);
    m_pActor->SetMapper( mapper );

   renderer->AddActor( m_pActor );
   renderer->SetBackground(1,1,1); // Background color white

   vtkStructuredGrid * mesh =...

  vtkSmartPointer<vtkContourFilter> filter =
  vtkSmartPointer<vtkContourFilter>::New();
  filter->SetInputData( mesh );
  filter->SetNumberOfContours( 1 );
  filter->Setvalue( 0, value ); // value is passed in

  m_pActor->GetMapper()->SetInputConnection( filter->GetOutputPort() );
  renderer->Render();
} 



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