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After merge the leg points with the body points I get this strange line in the intersection. Why?

This is the mesh:

enter image description here

This is the effect with shade flat:

shade flat

And this is the effect with shade smooth:

enter image description here

This is the file for review it.

Thank you!

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2 Answers 2

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There is a fully connected face "inside" your leg - meshes like this are known as Non-Manifold (they have stuff in them that shouldn't be there) - Blender works best with manifold geometry ("hollow" meshes) - delete the offending (interior) face and you're good:

enter image description here

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You have an internal face - that is, a face that runs inside your mesh from the verts seen on the outside.

You can see this if you go into X-Ray mode:

enter image description here

Delete it and you'll be fine.

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