You’re right, Z-Up does not do much good to Even Thickness, I was just referring to it regarding my experimentations.
Personally I prefer the term Miter Joints for my method as it is really mimics the real world woodwork for crown molding or picture framing. So far the consensus is leaning towards the more broadly understood Even Thickness term though! And I agree that it makes the Curve-to-Mesh ignore the Normal Mode. Note that the tilt can still be tweaked per control point though.
I guess that technically a Miter Joint option that’s actually changing the normals would make sense in Set Normal Mode node however it is so much linked to the profile extrusion that it does not make sense from a user stand point (can you think of a Geo Nodes use of Miter Joint Normals without Curve-to-Mesh?). Also, if Miter Joints was set on the Set Normal Mode, it would ignore any Even Thickness checkbox on the Curve-to-Mesh node… oh well.
Without complicating Blender too much, it seems reasonable to solve most problems with a single check box Even Thickness. More specialized Geo Node groups like yours should satisfy specific cases.
BTW, I noticed some twisting in your Curve-to-Mesh Even Thickness node group. Is that expected?
