Weird SSR-type refraction?

[BananableOffense]

See the following:

Weird lumen reflections

That looks like refraction. Generally you don’t want to use the refraction on thin, flat planes like glass. Even though technically real windows do refract light as the light enters the glass, upon exiting the glass it refracts is back to face the same direction as the original ray, resulting in essentially no visible refraction. IRL, refraction is often only particularly noticeable of curved surfaces, because the curvature causes the ray to exit the medium still going a different direction than…