public PhysicalSpace(ScreenSetup screenSetup, Vector3D headPosition, Vector3D rightShoulderPosition, Vector3D leftShoulderPosition, Vector2D forward, string name = "")
 {
     _name = name;
     _screenSetup = screenSetup;
     _headPosition = headPosition;
     _forward = forward;
     _leftShoulderPosition = leftShoulderPosition;
     _rightShoulderPosition = rightShoulderPosition;
 }
 public PhysicalSpace(ScreenSetup screenSetup, Vector3D headPosition, Vector2D forward, string name="") : this(screenSetup, headPosition, new Vector3D(0,0,0), new Vector3D(0,0,0), forward, name) {}