[vtkusers] Update vtkImplicitPlaneWidget2 programmly is slow

[zlf]

Hi 

I have a big polydata and a vtkImplicitPlaneWidget2 in renderer. I found the
update vtkImplicitPlaneWidget2 in the following way is much slower than
update plane by mouse directly.

            implicitPlaneRepresentation->SetNormal(plane->GetNormal());
            implicitPlaneRepresentation->SetOrigin(plane->GetOrigin());
            implicitPlaneRepresentation->UpdatePlacement();

           
impicitPlaneWidget->SetRepresentation(implicitPlaneRepresentation);

            renwin->Render();

I want it to refresh quickly.

Thanks

superZZ

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