Hi DesuDeus, here's what I get when saving your file with Output: N-gons, and then importing into an old version of C4D (r10) using the default OBJ importer and then just hitting render view:
As far as I can tell there are no shading artifacts present at all.
Is it possible that when setting up material properties that you are setting something which is causing the vertex normals to be ignored? Are you possibly enabling some kind of "phong break angle" option in the material or something similar to that?
Do you get something that looks different from what I show here when you only just open the file and hit render view? If the shading problems only start happening once you've edited materials then look very closely at what kinds of properties related to shading and normals treatment that might be in the materials that you are setting up.
- Michael
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