[Urgent]How to achieve an effect just like Genshin Impact character Upskirt Censorship?

This question may be very funny, but I try using this in my demo. Well I concentrate on the effect that the more you go close to see what’s underneath the skirt, the higher your character’s opacity level. I found that the opacity effect was not just a simple alpha gradient. Instead during the transparency (alpha from 0 to 1), the pixels rendered by character shader gradually appear like tile-based , so how to make that? Is this controled by a tile-based-like grayscale map? How to make that map if so?
You can see this effect on the video around 1:10 :

Thanks !

It’s called screen-door transparency. there are shaders for it on the asset store.

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