Align individual normal directions of curve points with geometry nodes

I’m having a bit of a nightmare trying to figure out this procedural stair system. My problem is aligning the normals of the vertical segments that make the stairs. At the moment when extruded become pushed in different directions. Any help would be great.




stair_tool.blend (4.5 MB)

You can try this setup:

stair_tool_FIX.blend (804.0 KB)

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Thanks so much !!

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