How to evenly extrude a mesh in geometry nodes?

Question

Using Geometry nodes Extrude Mesh node, I can extrude a simple cube like so:

But the moment I introduce more geometry, for example by adding loopcuts to the cube, the extrude node deforms the new geometry. I guess it interpolates normals around the sharp edges which is why the extrusion looks a bit rounded like so:

If using solidify modifier instead, I can fix this issue by using the Even Thickness option in the modifier. Is it possible to recreate this option in geometry nodes?

Answer 1

Update 8/25/2003:

• Here is a full setup for my solidify node.
  
• this is how the node group looks
  
• This how it looks compared to the solidify modifier

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Original post:

here is a true way to do it that is the same as the modifier.

if you want explanation then let me know 😉

Answer 2

With this solution you can't reproduce it 100%, but it works sufficiently well in most cases:

Just capture the normals of each point, scale them, and use this vector in the node Set Position.

This offsets the points along their normals by a certain value.

Alternatively, you can use the Scale Elements node, and then send the original mesh with the scaled version to the Mesh Boolean node.

But the main problem remains in any case: The scaling is not 100% with constant thickness, but it comes close.

Answer 3

In case of a cube, you can stack it like that: