Base

Base is Physics3D.System:
    .doc: """
    A Bulldozer can have either a rigid articulated chassis.
    The blade connection differ between bulldozers that can
    either only lift, lift and tilt, or lift tild and incline
    the blade.
    The undercarrige can either be fixed or pivot about the
    equalizer bar.

    """
    with Vehicles.Interfaces.UpForwardVectors
    chassis is MachineModeling.Components.Primitive.Base or MachineModeling.Components.Composite.Base

    blade is MachineModeling.Components.Primitive.Base with Bulldozer.Interfaces.Blades.BaseConnectors
    blade_connection is Bulldozer.Connections.Blade.Base