The Max Influences option lets you specify the maximum number of joints or influence objects that can influence a skin object’s points. You can set the Max Influences option as you smooth bind skin.

To set maximum influences

1. Select the objects you want to smooth bind, then select Skin > Bind Skin > Smooth Bind > .
2. In the Smooth Bind Options, set the Max Influences value.
3. Click Bind Skin.