[vtkusers] Problems using vtkExtractEdges with vykUnstructuredGrid, quadratic solid cell types

[John Platt]

Hi,

Have you tried using vtkUnstructuredGridGeometryFilter to extract the 
free faces without triangulation of the higher order cells?

HTH

John.

On 9/25/2017 8:47 AM, scotsman60 wrote:
> Hello!!!
>
> I've been trying to render the edges of higher order tets, wedges and hexas
> for a few hours now and I can't seem to get it to work.
>
> If I render the grid directly or extract the free faces and render I get all
> of the internal edges of the higher order cells displayed - this is
> expected.
>
> So I did some reading and looked at some examples and came up with the
> following - which unfortunately draws absolutely nothing. Note that
> self.mesh is a vtkUnstructuredGrid, If I write this grid out and import to
> Paraview I can see the higher order solids drawn correctly with the internal
> edges hidden for all cells.
>
>              meshEdges = vtk.vtkExtractEdges()
>              meshEdges.SetInputData(self.mesh)
>              meshEdgesAlgorithm = meshEdges.GetOutputPort()
>              meshEdgePolyData = meshEdges.GetOutput()
>              
>              meshEdgeMapper = vtk.vtkDataSetMapper()
>              #meshEdgeMapper.SetInputConnection(meshEdgesAlgorithm)
>              meshEdgeMapper.SetInputData(meshEdgePolyData)
>              meshEdgeMapper.Update()
>     
>              self.freeEdgeActor = vtk.vtkActor()
>              self.freeEdgeActor.SetMapper(meshEdgeMapper)
>              self.freeEdgeActor.GetProperty().SetRepresentationToWireframe()
>              self.freeEdgeActor.GetProperty().BackfaceCullingOn()
>              self.freeEdgeActor.GetProperty().SetDiffuseColor(0, 0.5, 0)
>              self.freeEdgeActor.GetProperty().SetEdgeVisibility(1)
>              self.freeEdgeActor.GetProperty().SetEdgeColor(1, 0, 0)
>
>
> Any input will be gratefully receeived,
>
> Thanx,
>
>
> Doug
>
>
>
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