Hi armin, I looked at your attached image, and nothing really seems to be wrong there.

Is the thing that you are concerned about the spot where the shaded surface part of the display has a little visible gap from the display of the edge here:




That's just a display artifact - the shaded part of the display is done by breaking the surface down into triangles. That's just an area that did not get a lot of triangles in the display mesh.

Currently the display mesh breaks things down by comparing angle values only, and if you have only a small shallow amount of curvature in an area, you get a bit too rough of a display mesh there.

It is not really anything to worry about, your actual surface is totally fine there.

The edge curve display is done to a higher accuracy than the shaded surface display - edges and curves are broken down on each screen redraw so that the display on the screen is only about 1 pixel off of the true curve. It's too calculation intensive to do that with the shaded surface display so the surface display can be somewhat rougher.

When you see that your edge looks fine, you can use that as more of a judge of things in this kind of situation. Just ignore little straight-ish deviations like this in the display mesh.

When you go to export to a polygon mesh format, you can make the exported mesh broken down by distances instead of only angle, so you can refine those areas further when exporting, like this:




- Michael