Transfer/Align curves normals to faces normals [duplicate]

Question

Hello again dear community,

Here is a very basic setup in which:

1. I Created a cube (as test geometry).
2. I separated the faces by splitting the edges and scale them down a bit with "Scale Elements" node.
3. I've capture the faces normals for each point.
4. I Created curves from the faces with "Mesh to Curves" node, indexes get shuffled around a this stage which is expected since spline points need be connected in sequential order in a loop).
5. I captured the new normals and they are different from the original normals.

I need to transfer (or align rotation) of the new curve normals with the faces normals.

I figured I might need to used the "Set Curve Tilt" node but how can I calculate the tilt angle needed for such alignment, I find this confusing since some normals need to be rotated on more than one axis apparently (index 8-11 in the spreadsheet for example)

any idea?

EDIT

To simplify the question what should I plug in the tilt socket that will make the "FixedNormal" column in the spreadsheet Match the "Desired normal" column in the spreadsheet in this setup. I need a way to determine if its 0, -90, 90, 180 or 180 degrees for every spline point.

Answer 1

In this case, you would only need to capture the normals of the faces with Capture Attribute before converting the mesh with Mesh to Curve.

Then you use the Capture Attribute node again to transfer exactly these values to the points of the curves.

Tip: By the way, use the node Store Named Attribute only if you want to use these values outside your node tree (e.g. in the shader or in another modifier). Otherwise you would only store additional values in the geometry, which would lead to additional ballast. If you absolutely want to use Store Named Attribute, remove the unused or no longer needed values at the end of your node tree with Remove Named Attribute.