[vtkusers] Viewing inner edges of tetrahedral vtkUnstructuredGrid

[Mathieu Malaterre]

Audette, Michel wrote:
> Hello, 
> 
> I am trying to view all edges, including the inner edges, of a tetrahedral mesh that was read as a vtkUnstructuredGrid, and finding that I'm missing something. I picked up on internet some intructions that suggest connecting a vtkGeometryFilter to vtkUnstructuredGridReader, and then using 2 pipelines from the output of vtkGeometryFilter: one with vtkPolyDataMapper & vtkActor, and one with vtkExtractEdges, vtkPolyDataMapper & vtkActor, with both actors connected to vtkRenderer. 
> 
> But I'm still only seeing the outer surface edges only. Using vtkGlyph3D will allow me to at least view inner vertices (in combination with vtkSphereSource), but I still need to see how these inner vertices connect. Unfortunately, paraview does not have a wireframe representation that displays inner edges. 
> 
> Can anyone suggest a way of proceding? Is there a parameter in my pipeline that I've neglected? 

You could also use a vtkShrinkFilter and then view as wireframe. I don't 
think this will be easy to see anything, though.

HTH
Mathieu