Strange lines on the mesh Somehow these strange lines have appeared on my mesh. Also, when I try to assign a material to a part of the mesh, everything gets distorted. How do I fix this?
The distorted mesh:

I've tried to clear parenting, but that didn't seem to work.
I've managed to fix those artifacts. Here's something what might help:
https://www.youtube.com/watch?v=0T3QdLJOBF8