Curved mid-side node mesh

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Curved mid-side node mesh

I have an unstructured grid made with vtkQuadraticTetra cells. (4 - corner
points and 6 - mid-side points).
Currently mid-side nodes are straight edge connected to the corner nodes. I
would like to get them connected in a curved edge.


How can I get the edges to appear as in the black line shown in the right
image. The left one is what I have now.


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