Just an incorrect accuracy

 From:  Michael Gibson
3195.2 In reply to 3195.1 
Hi andras, your shape is fine - that's just a display mesh artifact that you should ignore.

The edge curves are drawn at a very high level of accuracy, down to a individual pixel level.

The display mesh is calculated only once for an object and so does not perfectly represent it at all zoom levels, and it will tend to be a bit rough in areas that are very shallowly curved like you have in that spot there, because breaking things just by angle does not really subdivide it enough in areas that are fairly long but only have very shallow curvature.

In the future I want to make some additional paramters to use for additionally subdividing the display mesh, something like a "chord height" metric that should help to refine areas like this.

But currently when you see something like this, it is just a purely visual problem with the display mesh, so just ignore it.

One thing you can try to verify it is to export to a mesh format, the export mesher has some additional parameters like "divide larger than" which you can use to more finely dice the export mesh and if you have some reason to actually suspect a problem in that area you can see if the export mesh is well behaved there or if it looks like it has a problem as well.

If you saw some additional flaws like dark patches, then that would be more cause for concern and could indicate that there is a messy surface structure with overlapping or bunched up points. But your case here does not have anything like that, it is purely a lack of display mesh refinement.

It is a major goal of the display mesher to be as fast as possible, so you do not have to wait very long for the mesh to be generated each time you edit your model. That's why it does not try to just extremely heavily subdivide everything, that would then cause a lot more waiting for the mesh to be generated while modeling.

- Michael