How can I keep a spline's width consistent, regardless of the camera position? I’ve searched a lot but couldn’t find a solid solution.

ChatGPT suggested applying a Sketch & Toon render effect directly to the spline and adjusting the thickness, since it should keep a consistent stroke width. But I couldn’t get it to work. I didn’t even know you could apply a shader tag to a spline!

I also tried sweeping the spline with a circle spline, then linking the circle’s radius to the camera position. But this affects the entire thickness, and in some cases—like in the image I’m sharing—the spline is on the Z plane, meaning the perspective still alters the stroke width along the curve. So, that’s not working either.

ChatGPT also mentioned something about using a Hair Material, but I didn’t quite get how that would work.

Some friends said to go for a ortographic camera, but I dont wanna loos perspective here.

Any ideas on how to tackle this? Thanks a lot!