fixed rendering

Chunk.cs

@@ -25,11 +25,12 @@
 
         public void SetBlock(int x, int y, int z, Blocks block)
         {
-            Console.WriteLine(x.ToString() + ", " + y.ToString());
             int i = GetBlockIndex(x, y, z);
             if (i == -1) return;
             _blocks[i] = block;
             UpdateChunkMesh();
+
+            Renderer.MarkBuffersDirty();
         }
 
         public void SetBlockIndex(int i, Blocks block)