.IdealizedContact.UsersGuide.ContactInterface .IdealizedContact.UsersGuide.ContactInterfaceIn order to be able to use the dimensions of the contact surfaces in the contact block a new interface to connect the surface definition with a contact block is introduced. This adds a scalar vector to the MultiBody frame of the Modelica Standard Library that comprises maximum three terms to describe the surface geometry and the three direction vectors to resolve them in the connected frame. The latter constitutes the body coordinate system (BCS) of the contact surface.