protected override void PreBegin(GameContext context)
        {
            // Process a single texture block if the FPS is higher than 30.
            //if (context.GameTime.ElapsedGameTime.Milliseconds < 100)
            //{
            ChunkProvider.ProcessSingle();
            ChunkRenderer.ProcessSingle(context.GameTime, context);
            //}

            // Ensure we have an occluding sprite batch.
            if (FilteredFeatures.IsEnabled(Feature.IsometricOcclusion))
            {
                if (this.m_OccludingSpriteBatch == null)
                {
                    this.m_OccludingSpriteBatch = new OccludingSpriteBatch(context.Graphics.GraphicsDevice);
                }
                this.m_OccludingSpriteBatch.Begin(true);
            }
            else
            {
                context.Graphics.GraphicsDevice.Clear(ClearOptions.DepthBuffer | ClearOptions.Target, Color.Black, 1f, 0);
            }
        }