[vtkusers] Problem with vtkExtractEdges not updating

[Ted Christiansen]

Hello,

I am using vtkExtractEdges to show the edges of elements in an
unstructured grid.  It is setup first with the
vtkPoints/vtkUnstructuredGrid in the "design" condition.  Then I show a
deformed plot and modify the vtkPoints to their deformed locations.  For
some reason I cant get the vtkExtractEdges to update - the extracted
edges show the wrong shape!  I have tried using UpdateData(vtkGrid) - it
works sometimes and other times crashes.  Does anyone have a suggestion
to get this filter to update the mapper?

All of the vtk objects are member variables of a class (are not
temporary).

// initial setup
m_vtkEdgePoints->Allocate(m_nodes.GetSize());
m_vtkEdgeGrid->Allocate(m_faces.GetSize());
... add faces here
m_vtkEdgeGrid->SetPoints(m_vtkEdgePoints);
m_vtkEdgeFilter->SetInput(m_vtkEdgeGrid);

m_vtkEdgeMapper->SetInput(m_vtkEdgeFilter->GetOutput());
m_vtkEdgeMapper->ImmediateModeRenderingOn();
m_vtkEdgeActor->SetMapper(m_vtkEdgeMapper);
pDoc->Props->AddItem(m_vtkEdgeActor);

<snip>

// after deformed display, now return to "design" condition
for (i=0;i<m_nodes.GetSize();i++) {
   node = &m_nodes[i];
   m_vtkEdgePoints->InsertPoint(i, node->X(), node->Y(), node->Z());
}
// THIS CAUSES A CRASH SOMETIMES:
m_vtkEdgeFilter->UpdateData(m_vtkEdgeGrid);

Regards,

Ted