I have seen this a few times in Rhino 6, you take a line from a model in world coordinates, and for example create a buffer, so you can make a surface. But when you mesh that surface, it ends up looking like it would in 3dsMax, or other programs that can’t handle large coordinates. This is a major problem for me, as I work like this all the time. to make matters more complicated, it does not seem to do this all the time…
Hello - Rhino always works in world coordinates behind the scenes - your image looks like it is very far from the world origin.
https://wiki.mcneel.com/rhino/5/video/troubleshooting/artifacts
https://wiki.mcneel.com/rhino/farfromorigin
-Pascal
Thank’s
It’s in world coordinates yes, so they are large coordinates. But does’nt the “farfromorigin” idea crash with what is written here:
https://www.rhino3d.com/accuracy/
I need my cad software to be able to work where ever the data is, and I prefer to use Rhino for most jobs, but if I can’t use rhino for large coordinates, I will have to figure out something else.
Is this a problem for Grasshopper as well? As there are tons of tools for grasshopper that work with “world data” and maybe should’nt?
Also, I have only ever seen this problem when it comes to triangulation. everything else works as excpected 
Hei Gudmund -
I take it that you refer to the creation of display meshes and not a workflow for converting NURBS objects into meshes?
If you have a specific case and step-by-step instructions on how to reproduce what you are seeing, please post a 3dm file and those instructions so that we can take a look.
-wim