Creating a very simple figure out of plane with Bevel modifier following by Subdivision Surface resulted in weird geometry.
Steps how to reproduce the problem:
- I've used a mesh plane,
- squished z-axis and applied scale,
- then added 4 loop cuts,
- then moved middle part with G or move tool,
- afterwards added modifiers
- and used shade smooth.
Normals weren't changed, all geometry is same as before, no n-gons were created. Why this might happen?