Fix face smoothing

Question

I would like to know why it happens and how to fix this issue? I have a model imported from the FBX file. I want to add a face to this model. So, I select edges and press the F button. After this operation a smooth shading is broken in the faces that are next to a new created face. Please take a look at the screenshots below:

faces normals shaders

Christopher Bennett · Answer

The shading artifacts are being caused by the n-gons surrounding the circle, as well as a lack of supporting geometry. As a quick fix, you could try selecting all the front faces that aren't part of the circle and giving them a slight inset:
Before inset (faces selected):

After Inset:

Fix face smoothing

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