BIM Troublemaker proposes a solution that makes Reference Lines normal, at least in the short-term…and he adds a throwdown to Buildz at the end 🙂

I’ll start with my 3d triangle and draw a rectangle on its face. Lookie Dis! They are aligned in the direction i want!

I deleted 2 lines i didn’t need, slapped reference points hosting my extrusion profile on the 2 remaining, and then pulled them to the edges of my triangle…

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BIM Troublemaker: Aligning Reference Lines