Low resolution render in 3d without disturb interface

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:bust_in_silhouette: Asked By LucasGobbs

I already see it this post :
https://forum.godotengine.org/17131/how-to-lower-resolution-for-a-3d-game?show=17131#q17131

example of the low resolution look:
http://i.imgur.com/3Js4sLN.gif

But in this aproach to a low resolution render the interface and gui are also disturbed by the size of de render buffer.and i wanna some way to achieve this low resolution style just to the 3d parts of the game with a normal GUI
(preferably without using shaders)