protected override void Update(GameTime gameTime)
{
//if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
// Exit();
GameUtilities.Time = gameTime;
if (InputEngine.IsKeyHeld(Keys.Escape))
{
Exit();
}
mainCamera.Update();
gameObjects.Clear();
//quadTree.Process(mainCamera.Frustum, ref gameObjects);
octree.Process(mainCamera.Frustum, ref gameObjects);
base.Update(gameTime);
}