Is this still happening? I really love Octane but the rounded edge feature is a real let down. We really need something better.
https://render.otoy.com/requests/?qa=12 ... ge-shading
Improved rounded edges have been announced in our roadmap for v3.10.
What we plan is to keep the current implementation, which just works in some cases and which is extremely fast compared to most renderers and add a new "accurate" option that will hopefully solve the current issues and add extra functionality.