Optimizes animation vertex shader
Optimizes animation vertex shader

cedricpinson/osgjs,gideonmay/osgjs,kkuunnddaannkk/osgjs,kkuunnddaannkk/osgjs,jmirabel/osgjs,gideonmay/osgjs,hishamabdelrahman/osgjs,cedricpinson/osgjs,kkuunnddaannkk/osgjs,gideonmay/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs,jtorresfabra/osgjs,jtorresfabra/osgjs,jmirabel/osgjs,hishamabdelrahman/osgjs,jmirabel/osgjs,hishamabdelrahman/osgjs