> 
Select whether to unlock or lock face normals.
-
-
The edges surrounding the vertex face are hardened if it is possible to do so, and the normals unlocked. This is the default
setting.
-
-
When Match face normal is set, the vertex/face normal value is matched and locked to its current face normal.
Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License