simplify MSAAEffect.
simplify MSAAEffect.

Jozain/three.js,bhouston/three.js,Jozain/three.js,Jozain/three.js,Jozain/three.js,bhouston/three.js,bhouston/three.js,Jozain/three.js,bhouston/three.js,bhouston/three.js,bhouston/three.js,Jozain/three.js