public GameWorld(Game game, ContentManager cm, Camera cam)
: base(game)
{
content = cm;
camera = cam;
components = game.Components;
physworld = new PhysicsWorld(game);
modelmgr = new ModelManager(game, cam);
level = new Level();
components.Add(physworld);
components.Add(modelmgr);
sfx = game.Content.Load<SoundEffect>(@"Audio/punch");
punch = sfx.CreateInstance();
punch.IsLooped = false;
sfx = game.Content.Load<SoundEffect>(@"Audio/bgm");
bgm = sfx.CreateInstance();
bgm.IsLooped = true;
bgm.Play();
}