Lots of youtube tutorials on this, search "game vfx portal tutorial" for example: https://dev.epicgames.com/community/learning/tutorials/dBj6/unreal-engine-create-stunning-portal-effect-vfx-with-niagara-particles-complete-tutorial
Small update / extra question: Thanks again for the suggestions. I looked at a few portal VFX tutorials, but most of them are more focused on Niagara particles or gameplay portals. What I’m still struggling with is mainly the material/shader structure itself. Right now, my biggest issue is that the portal still feels too…