Hi V, there is no reason to worry - that's just an area where the display mesh did not get a lot of polygons.

That can happen in areas that are somewhat broad in size but only shallowly curved.

It's purely a display artifact, your actual surface is fine and if you export to a mesh format you can use some of the export meshing options to make more polygons be created in those areas if you want.

Here are a few previous discussions about this:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3292.9
http://moi3d.com/forum/index.php?webtag=MOI&msg=2727.3
http://moi3d.com/forum/index.php?webtag=MOI&msg=2725.4


But basically it is just something to ignore.

In the future I will be doing some work to make the display nicer in areas like that, but it only has to do with the on-screen realtime display of the surface.

- Michael