Some of my general questions thread...

 From:  Michael Gibson
9534.4 In reply to 9534.3 
Hi Curious, the artifact you see there is just a display artifact, it's caused by the display mesh not generating a lot of triangles in that particular area.

It's something you should just ignore, if you want to check if it's an actual surface defect you can do that by exporting to a polygon format and cranking up the density. If the artifact goes away then it's just a display artifact, if it comes into more detail with a higher density mesh display then it's an actual surface defect.

In general the viewport display is oriented towards speed so that you don't have to wait around a long time after every operation to see anything. So part of what goes along with that is that there are different kinds of display artifacts that are just normal behavior.

In the future I would like to improve the display quality by doing something like calculating a higher density display mesh on a background thread. Such things are difficult to implement well though.

Here's what your surface looks like with a high density mesh, seems to be fine: