weird seam thing in Maya, screws up smoothing

erik!

as I was working on this face, I couldn't delete edges in a few places. I worked around it to get what I wanted. But then I smoothed it and got this weird seam goin on. Wasn't sure what it was and went about my business and tried to append a hole in the mesh and found that there is a border where there shouldn't be. Not sure how it happened, but it needs to be fixed and I don't know how. Help me please!

cholden

run through all the common fixes here:

freeze transforms, delete history, weld verts, smoothing groups, delete and recreate problem edge, export to obj > import > smooth

past those, it's been a while since I worked directly in maya, not sure.

Whargoul

It's possible that one side has reversed normals to the other, and they are welded together.

erik!

Whargoul: you were exactly right. The normals were reversed and now they're fixed! hah! Not sure how it happened, but I know how to fix it if it ever happens again. Thanks for the help!

Illusions

Extruding edges sometimes makes them backward, and I believe the create polygon tool always makes them backward.

erik!

Extruding edges! That makes so much sense. Now that I think about it, all that weirdness happened after I extruded some edges from the eye area. Good to know.