Maya 2019 vertex issue

juanoblagu

hey guys im having issue with maya, i had to deattached the eye socket and mirror it, then attach it again with merge vertices tool, but in this side im getting this pinching out of nowhere, the vertex are all merged and there are no lamina faces, not sure what is happening here (the pinch appears only on smooth shaded view)

Alex_J

it happens sometimes and i never figured out why exactly, but the quickest solution for me is to delete those faces and then refill it. The cleanup tool doesn't always catch whatever the issue is. 
also may want to check out the symmetrize tool if you aren't familiar, think its covered here: https://lesterbanks.com/2019/06/how-to-quickly-re-symmetrize-a-model-in-maya-for-symmetry/

For mirroring I recommend malcoms tools here: malcolm341 (gumroad.com)
there is a suite of mirroring tools which take out a lot of this jankiness and speed things up
working with mirrored instance seems generally smoother and less buggy compared to symmetry

gioxo

for  the merge did you use mirror option or did you pass them one by one? 

sometimes maya's merge doesn't work very well, I would advise you to check the edgeloop again.
If you worked on the geometry before reattaching it, you might also have an extra vertex  in those points        

juanoblagu

i had to do what @Alex_Jsaid, delete faces and refill it. to answer @gioxo i merged them all with the tool, not one by one, check if they were actually merged and then mirrored