There are these well known shading artifacts when you have edges on a flat surface and put it on smooth shading.

When I use the edge split modifier on an object and put it on the angle mode it will remove these artifacts.

When I mark the edges as sharp and use the sharp edges mode it will still show these artifacts though.

I'm just curious why it doesn't remove them then.

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    $\begingroup$ Any screenshot to see what do you mean by "artifacts"? Thx $\endgroup$ – Polosson Mar 23 '15 at 14:14
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    $\begingroup$ Your mesh probably have triangles in those areas, try to change to quads. $\endgroup$ – Denis Mar 23 '15 at 15:17
  • $\begingroup$ @ Polosson I'm talking about the general shading "errors" when there are some tris or N-Gons. $\endgroup$ – Jonathan Mar 23 '15 at 23:30

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