public void Setup()
 {
     _manifoldManager = IoCManager.Resolve <IManifoldManager>();
     _circleA         = new PhysShapeCircle {
         Radius = 0.5f
     };
     _circleB = new PhysShapeCircle {
         Radius = 0.5f
     };
     _polyA = new PolygonShape();
     _polyB = new PolygonShape();
     _polyA.SetAsBox(0.5f, 0.5f);
     _polyB.SetAsBox(0.5f, 0.5f);
 }