diff --git a/index.html b/index.html
index a1e77d0..d305dba 100644
--- a/index.html
+++ b/index.html
@@ -74,6 +74,10 @@
   
   <!-- libs -->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/EffectComposer.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/RenderPass.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/postprocessing/ShaderPass.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/three@0.128.0/examples/js/shaders/CopyShader.js"></script>
 
   <!-- global -->
   <script src="./globalScript.js"></script> <!-- TODO: compact the other global scripts into this global script -->