Please see pics. How do I fix this problem? I want the surface to stay normal after splitting/trimming.
This is likely an artifact in the render mesh rather than the actual nurbs geometry. Try refining the render mesh from the object properties. If that doesn’t fix it, upload the weird part of your file so someone can have a look.
… or a small tolerance problem with the surface.
really hard to tell the truth without the file.
Thank you!! It’s now normal after I clicked “Custom Mesh” for the display mode.