Round Wall S-Curve Joints / Seams in General Discussion Posted March 5 57 minutes ago, line-weight said: If I understand this right - the problem is that when you join two "round walls" together, meeting at a tangent and so on, hidden line rendering draws a line at the join, where there shouldn't be one (and OpenGL draws it correctly)? To me, that's a problem with the behaviour of hidden line rendering, rather than with the behaviour of the wall objects as such, if you see what I mean. I come up against this now and again where hidden line draws a line between wall objects that are supposed to be joined. Sometimes it just won't go away and I have to messily blank it out in vport annotations. Yes, that’s the issue. I thought I saw a solution somewhere in the forums, tweaking the crease value or something… maybe on a round wall / door post… I’ll keep digging but I think there’s a magic number somewhere that solves it.