[vtkusers] isosurface update issue

[David E DeMarle]

>
> It may not be a good idea to delete the actor and make a new one in every
> call.


It can work, but in addition to deleting the old actor, you have to call
renderer->RemoveActor(oldactor); Otherwise the renderer's reference keeps
the original actor alive.

David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Sat, Dec 1, 2018 at 9:27 AM newcfd via vtkusers <
vtkusers at public.kitware.com> wrote:

> Thanks for your reply. mapSphere was a typing error and should be mapper.
> I made the following changes and still have the same problem.
>
> void MyApp::redraw( const double value )
> {
>     if ( 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() );
>   renderWindow->Render();
> }
>
> It may not be a good idea to delete the actor and make a new one in every
> call.
>
>
>
> --
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