Deep shading around polygons on smooth surface

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1

Edit: Solved! There was 6 extra verticles (according to ‘remove doubles’), although that didn’t visually change anything. ‘Recalculate normals’ fixed the problem. Thanks! :smiley:

So I have a shape. It has a smooth round side, but there is sharp shading around one polygon.

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Above: the problem (same happens on the same spot inside). Below: wireframe showing nothing abnormal. (the top and bottom are not supposed to be a single surface, I merged it while trying to fix this)

There was more problems with the shape, such as multiple/overlapped edges, so I guess I did something wrong to begin with. However, I want to know why this particular issue is happening and why I can’t find anything wrong.

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upload.png549×561 21.6 KB

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In this order:
Remove any faces that are inside your mesh
Select all vertices
Remove any doubles (W / remove doubles)
Recalculate face normals (Ctrl+N)
If any face normals are still pointing in the wrong direct select them and W / flip normals
In object mode press the Smooth shading button in the tolshelf

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Throw in an Edge Split modifier, too. That can help sometimes in these cases, but Richard’s tips are all good.