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Image target see through box

I'm trying to achieve similar thing using vuforia like this demo https://developers.google.com/ar/images/augmented-images-demo.mp4  How can I achieve this. So far augmentation working .  I tried to use VFX xray effect. But in this demo from front it will show the normal stage but from angle it's showing the object. I'm not sure how to do that. Should i calculate the angle or i can use any shader. Please help me