Preserving the exact same PNG result as Sprite

Is there a way to add an Image as Sprite that is not affected by any filter, scale or zoom? I just want to add a PNG to the 3D world and this PNG must preserve the exact same size even when moving the camera.

I’m trying this with sizeAttenuation=false but the result of the PNG is blurry, plus I have to change the scale because by default is huge on the scene.

Is there other technique to achieve this?