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Hopefully the answer to my question is as straightforward as the question itself. The image below demonstrates how a stroke can be aligned to an object in an app like Illustrator or Affinity Designer. Can that be implemented in Geometry Nodes with instances along a curve?

I'm instancing wood slats for archviz purposes. By default, it's of course centered, which is great, but the nit-picky side of me wants to know if this is easy or even worth looking into. I tried this before but had an issue where the inside/outside definitions needed to be described to a degree that's outside of my current Geometry Nodes knowledge. If I moved +Y it was good, outside was outside, but if I went -Y it would flip inside. As you can conclude, the same happened on the X axis.

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You can emulate the centered style using a geo-nodes set up that creates both an inside and outside “stroke” and join them. See the screenshot.

screenshot of geo nodes set up

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It's very simple indeed. The origin of the geometry is put on the curve. If you look at the first gif of this answer:

Imgur mirror (SE image hosting has problems)

You can see the instanced lines / curve profiles are one-sided. That's because the profile that is instanced is one-sided, its one side sits at origin.

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