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How to distort a glass reflection to make it look the same as pictured below? enter image description here

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I don't know about the physics of such glass, But it can be created using standard bump mapping.

enter image description here

The light path is not necessary here, but just to be cautious ...

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    $\begingroup$ For the right reference image, you can increase the distortion in the noise texture. $\endgroup$
    – Omar Emara
    Commented Oct 28, 2016 at 12:43

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