NoteYou need to set a Weight Change Percentage value
greater than 0.0 when smoothing all the vertices on a bound surface.
(Optional)
Turn on Preview and then click Apply to
highlight in the scene view the vertices that will be smoothed by
the Smooth Skin Weights operation.
The vertices highlight yellow.
TipIf many vertices highlight yellow on your
character (for example, like in the above image), then your Weight
Change Percentage value is too low and should be increased.