As you can see on the picture, somtimes some edges are shown strangely. Does somebody know what's the reason for this mess? In the OCC samples there's no such problem. It doesn't matter if antialiasing of the view is on or off. I have seen this artifact on at least 3-4 different machines with different video cards. I'm with OCC 6.2.1, but it was the same with version 5 in the past.