Problems with weird edges after Subdviding/Smoothing surface I am modelling my first blender character ever. I modeled one side, then symmetrized it and merged the two symmetrical sides together.
When adding the subdivishion Surface modifier and/or adding the smoothing Surface, I cannot get this edge to be smooth as the others. It forms into a sharp line all along my mesh.
I tried deleting doubles using Merge by distance and I tried smoothing it in sculpt mode. I tried deleting the edge by combining the two faces into one, but that just made two weird lines instead of one.
My blender file. I have no idea how to fix it.
Ur Problem is the face orientation. If u Turn on &quot;Face Orientation&quot; on and check, u can clearly see half of ur face is its back facing outside (Red is the back of the face, Blue is the front of the face. Generally, u shoud have all faces blue)

select all ur faces and type F3, search for &quot;recalculate outside&quot; to correct ur wrong facing direction. then it should smooth properly