Update rendering.js
Update rendering.js

Fixed for alpha in setClearColor.
juanprietob/brainbrowser,OnWithLife/brainbrowser,juanprietob/brainbrowser,rdvincent/brainbrowser,rdvincent/brainbrowser,OnWithLife/brainbrowser,juanprietob/brainbrowser,rdvincent/brainbrowser,juanprietob/brainbrowser,OnWithLife/brainbrowser