Using CCGrid3DAction cause blur on CCSprite on retina devices

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Apply any Grid3DAction for some CCSprite:  
[plank runAction:[CCRepeatForever actionWithAction:
[CCWaves3D actionWithWaves:1 amplitude:10 grid:ccg(12, 24) duration:3]]];

What is the expected output? 
-Normal picture animation 

What do you see instead?
-Blured picture animation

What cocos2d version are you using ?
-2.1.0

What iOS / Mac SDK are you using ?
-iOS 5.1 

Debug or Release ?
-Both

Which target device / target OS are you using ?
-iPhone 4.2 - 5.1

iOS only: Does this happens on device ? or on the simulator ? or on both ?
-on iphone 4S/simulator 5.1 iphone retina  

Please provide any additional information below.
-The same blur occured even on "do-nothing" custom action inherited from 
Grid3DAction. May be problem in CCGrabber?

Original issue reported on code.google.com by i.Pogoretsky on 7 Sep 2012 at 10:26

[GoogleCodeExporter]

Same effect here,
i have looked into the code, although CCGrid uses its own set2DProjection 
function this does not appear to be the case, it looks like somewhere a lower 
than wanted quality image is taken and used instead of a retina one ...

Original comment by qvve...@gmail.com on 11 Sep 2013 at 11:00