If I create a plane, subdivide it in halfs, grab the edge in the middle and pull it upwards and then inspect the normals, they show up like this:

Model being edited

Now, I do not see double normals at any vertex. Still, the rendered output suggests that the normals where the faces meat eachother are different:

Rendered output

Now, which normal is applied on each of those two faces? The average of the vertex normals?

  • 1
    $\begingroup$ This looks..normal. Pan around the shape and see if you get and really dark spots. A face's normal display color changes depending on the angle your looking at it. $\endgroup$ – Josh Silveous Mar 2 '17 at 16:16
  • $\begingroup$ The average normal of all vertices on a face is used for shading. If you want the vertex normal the shading would have to interpolate. Select "smooth" (shading) for the object in that case. $\endgroup$ – Leander Mar 2 '17 at 16:38

Auto smooth is required to display individual normals.

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