private void CreateSystems()
{
ISystem newSystem;
//--update
newSystem = new SystemAudio();
systemManager.AddUpdateSystem(newSystem);
newSystem = new SystemLinearMovement();
systemManager.AddUpdateSystem(newSystem);
newSystem = new SystemAudio();
systemManager.AddUpdateSystem(newSystem);
newSystem = new SystemGhostAI(entityManager);
systemManager.AddUpdateSystem(newSystem);
newSystem = new SystemPlayerControl(sceneManager);
systemManager.AddUpdateSystem(newSystem);
//--collision
newSystem = new SystemCollisionDetection();
systemManager.AddCollisionSystem((SystemCollisionDetection)newSystem);
newSystem = new SystemCollisionResponse(entityManager);
systemManager.AddResponseSystem((ISystemCollisionResponse)newSystem);
//--render
newSystem = new SystemRender();
systemManager.AddRenderSystem(newSystem);
//--final
newSystem = new SystemMovement();
systemManager.AddFinalSystem(newSystem);
}