Version: 2018.1
public bool useSideFriction ;

Description

Should friction be used on the platform sides?

When false, a contact on the side uses no friction. When true, any existing friction is used. This is useful to stop friction slowing a Collider2D when in contact with a vertical surface when a force is being applied to keep the Collider2D in contact with the surface. The "sides" are defined as the edges perpendicular to the "top" surface(s) in local-space.