So, I’m learning UE5 and want to make a window with water droplets. I’ve used this tutorial to make my material: https://www.youtube.com/watch?v=yl6Vh-hmKjk . My problem is that i have weird reflections on the sides of my window, no matter what I try, they won’t go. I thought it is because I use fresnel, but I don’t really know. Is there a fix for this?
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It’s correct. The water is refracting the light, which changes the apparent location of the sky.
You could reduce it by reducing the refraction amount.
There’s also more than one way of computing the refraction
And what are the differences between those computing methods?
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Yup, no idea. You have to give it a go 
It might be documented somewhere…