Face Fit
SmileLine creates the smile crease near the mouth corner when the optional SmileLine setting is enabled.
Face Fit: Smile Line
SmileLine helps create the crease that usually appears on smiling faces near the corner of the mouth.
Because this adds additional controllers and complexity to the setup, it is not recommended to add SmileLine on all characters.
Simple or cartoony characters are likely to work better without adding SmileLine.
