WOW, I increase the angle just for fun and the mesher dosn't create crap (case (8) - the Rhino "o" with rounds), it looks like it should look, also at this extrem raw angle. I'm impressed!



... but I found, that the result is not stable at all angle values - maybe it's possible that the mesher can be refined to avoid this effect. But's good to know, that it help to fine adjust the angle value to avoid some sideeffects.