I been trying for a while to draw smooth lines in Unity but with Line Renderer I obtained only jagged lines with the corners not rounded, in particular when the angle of curvatu
I had this issue with Unity 2017.2. I tried changing my AA settings to max to get rid of line render jaggies. Didn't work and it was frustrating.
My solution was resolving the problem that MSAA was turned off on the camera because rendering was deferred. The camera has a setting for "use graphics settings" which should have never messed up in the first place, but I'm a beginner - I don't know much. I changed the setting to "forward" and my jaggies disappeared into the mist.
If I was more industrious, I would post before and after images.