How to display the delaunay triangulation line for marching cubes?

Support
1

The isosurface obtained by marching cubes is actually a vtkPolyData. And it consist of many lines. How can I display those line? I only need to display lines (the first picture) nor the rendering (the second picture).

p1

p2

2

Here is an example that shows all the edges in the marching cubes output:

https://lorensen.github.io/VTKExamples/site/Cxx/Visualization/Wireframe/

3

Thank you for your kindly answer.