Weird looking meshes

Is it possible to know why some meshes come out looking like this?

Hi -
Could you post the 3dm file?
Unless you have changed the defaults, it looks like there are several objects and one (or more) is selected?

Thank you, but I can’t post it yet. I will try to recreate it in a different file.
Here is another screen -it almost looks like a shrink wrapping effect of a few mesh patches.

Hello- try RebuildEdges on that object - what happens?


Thank you, but not much happens. Here is another example:

Hello- are your objects very far from the world origin?


The last example is situated at 2500mm from origin. But it’s a large assembly.

Hi Rarara - I guess we need a file to look at… post here or send to, with a link back here in your comments.