What could be the cause of this?
Hello ,
Thank you for posting in the community regarding this behavior. It seems like you might have a haze affect/volumetric shadow on a light? Maybe some strange reflection issue as well.
It could also be a hardware issue. I recommend you check the system requirements to make sure your computer can handle this scene.
https://twinmotionhelp.epicgames.com/s/article/Twinmotion-System-Requirements
If you are not able to resolve this please submit a bug so we can best investigate:
https://twinmotionhelp.epicgames.com/s/case-community-page
Kind regards,
Vincent B.