Geometry Nodes: how to shade smooth a booleaned object

Question

I made this two-walled sphere that is perforated with cylinders. The wall of the cyclinders between the two spheres creates a connection between the two spheres:

Node tree:

I would like this object to shade smooth, but that gives this ugly geometry:

I tried to make a seam with the intersecting edges output of the mesh boolean node with the seperate geometry node, but that makes the internal sphere disappear.

Does anyone know a good solution? My goal is to make everything smooth and the faces of the cylinder remains between the two spheres round.

Answer 1

Add "Split Edges" node before "Set Shade Smooth" and conect the "intersecting edges output" to "selection" input of Split Edges.

_{(Blender 3.3+)}