Imported an OBJ file in Blender 2.91.0. Mesh looks OK in wireframe view and exports OK to other s/ware but weird in all shaded viewport views. Example included shows object Shaded Flat. All surfaces are concaved. A recurring issue for me. Checked normals are OK, checked no modifiers on the object apart from a collision modifier. Searched the net. Any ideas?

Flat Shaded


  • $\begingroup$ That's interestingly screwed up. On properties/object data/geometry, click clear custom normals. If it doesn't help you out, link a file. $\endgroup$
    – Nathan
    Mar 2, 2021 at 0:48
  • $\begingroup$ OK that fixed it! Thanks Nathan. Custom normals would have come across in the OBJ file? $\endgroup$
    – PJ3D
    Mar 2, 2021 at 0:59

1 Answer 1


Answer provided by Nathan. Solution was to clear custom split normals in Object Data Properties/Geometry Data.


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