Hi danperk, yes that is interesting that the same artifacts are present in natively created Modo geometry as well.

This kind of artifact gets reduced when polygons get smaller in size on the screen, so increasing the vertex count around the circular direction is one way to do that, but also doing a few vertical divisions is another way.

But you really should not need to go to such a high density to avoid these artifacts in a full render, it would be better if the full render did a more proper vertex normal interpolation so that you could get nice results with lower polygon counts.

Taking some shortcuts in interpolation can help to speed things up, maybe this is an area where some quality was sacrificed intentionally for a speed gain, but it would be good to have an option to control that if that was the case.

- Michael