# Why subdivided faces with smooth shading acting weird?

I have this model, and when I add the subdivision-modifier:

it seems to be okay, for me (I guess those bumps are there, because of the triangle faces instead of quads):

• Thanks, I figured out, a few minutes before you, although I started to flip the normals manually -- thanks for the global recalculate tip:) Dec 28 '13 at 23:29