UE 5.0.2 - Mirror Reflection Shadows Too Dark - Ray Tracing

[ThinVeil]

Hey Gatzkerob,

I am on the same mission as you, creating a real time mirror.

In short there is a limitation with Dynamic GI and reflections, it just isn’t quite there yet.
More of an in-depth answer is here.

Lumen GI and Reflections feedback thread

Lumen reflections are more limited in some ways than standalone RT reflections, and quality is currently one of them. To begin, the reason the artifacts dissapear when you look crossways to the mirror is because of lumen’s screen traces: basically, lumen uses a high-quality version of screen-space reflections as the first tracing method, and the detail problems go away because it’s reflecting exactly what’s on screen, and not the lower-fidelity lumen scene. If the reflected area isn’t visible …

Basically your best bet is to use standalone Ray trace reflections with Lightmass GI to get the results you want.

I actually didn’t know pathtracer worked with dynamic GI that’s cool. That will be great for stills.

Good luck, I know I am still tinkering with my mirror a bit, but for the most part I have it working with Lightmass and RT reflections. Sucks we can’t use lumen yet for it.