Fixing bad normals orientation

Source: here

The fix:

Display the normals to check any errors:

  • Viewport Overlays
  • Check Face Orientation Then:
  • tab in edit mode
  • select all (or specific faulty zones)
  • Shift + N: recalculate normals
    • or in the menu: Mesh > Normals > Recalculate Outside > Recalculate Normals

Some pictures

The bad boy

Img normal1 Face Orientation

You can see the faulty normals

bad normals edit normals 1

And now its fixed edit 2