# strange lighting, problem with normals?

I'm trying to create a simple human mesh. While working on the torso, I noticed some shading errors. They look even worse when you move the camera around.

The one on the left is with shading set to smooth and subdivision set to 5 on basic, the one on the right is shading set to flat, and no subdivision.

Here's another one...

I've found that I can replicate the effect by simply making vertices go into the mesh.

Does anyone know how these could be fixed?

• Also make sure that the large ngon is connected to the edge, in the images in your question it looks to me like there are some disconnected bits.. Try selecting non-manifold geometry with Ctrl Shift Alt M in edit mode. – gandalf3 Oct 22 '14 at 2:12