When I use the knife tool on my mesh, any face connected to the cut becomes "incorrect". (I don't know the true term)

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The underside of my mesh was smooth before I cut the mesh. Now, there are odd triangles that even appear in the render.

  • 2
    $\begingroup$ Important addition to your question will be screenshots of mesh in Edit mode and stack of modifiers (also a blend file can be useful). Generally there's too much distortion which causes bad shading and artifacts on triangles, most likely topology in that part should be redone. $\endgroup$
    – Mr Zak
    May 7 '16 at 23:14
  • $\begingroup$ Please use the edit link on your post and add more information so that others can help you. $\endgroup$
    – user1853
    May 8 '16 at 0:31
  • $\begingroup$ We will need before and after pictures of the model in edit mode in order to do more than speculate. $\endgroup$
    – Kirbinator
    May 8 '16 at 2:36
  • 1
    $\begingroup$ I'm guessing you created an n-gon in the process of cutting, and now the tris that the n-gon consists of are prevalent in the shading. Try to reshape your topology to quads. Other than that, without seeing the .blend I'm guessing in the dark. $\endgroup$
    – Mentalist
    Mar 9 '17 at 14:15

Have you tried the J "join" tool instead?

Here is a link to the Blender Reference Manual on Vertex tools



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