/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.SkyBlue);
// Draw the world.
sceneRenderer.Begin(camera);
world.Draw(sceneRenderer);
sceneRenderer.End();
base.Draw(gameTime);
}