I've been working in blender for the past 3 years and never encountered something like this. When I set the normal shading for this object to flat, it shows up like this.

enter image description here

I made sure the the faces all had the same normals. I tried shading them smoothly and adding sharp edges, that results in the strange smooth normal shading shown below.

enter image description here

Any help would be appreciated.

  • $\begingroup$ I know you said you checked, but could you double and triple check the vertex normals? idk what else it could be. $\endgroup$
    – ruckus
    Jun 22, 2017 at 21:49
  • $\begingroup$ If object is imported try removing custom imported normals, blender.stackexchange.com/questions/76513/… $\endgroup$
    – Mr Zak
    Jun 22, 2017 at 21:56
  • $\begingroup$ Its not imported and I checked the normals again, everything is fine Normals and this doesnt show up on the rest of the model Rest of Model $\endgroup$
    – Jordan T
    Jun 22, 2017 at 22:49

1 Answer 1


TL:DR press Set From Faces in the Shading tab of the Tool Shelf.

What's happened is your normals have got bent out of shape in a weird way that the usual Ctrl + N make normals consistent doesn't see as a problem.

They're all facing the right way vis-a-vis inside/outside, but they're all over the place in terms of direction. So you just tell Blender it needs to force all normals to be perpendicular to their corresponding face.

I still have no idea how this problem occurs in the first place, though. It foxed me for a good few days.


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