I’m trying to make a virtual concert in UE4. Recently I’ve gotten the visuals to be an emissive material, however they only update at buildtime instead of runtime. The images attached are a before/after of building the lighting.
As far as i know, you can only get static lighting from an emissive material, so it is baked in during a build and never changes after that. Dynamic lighting from an emissive would require real-time global illumination, but I’m not sure even UE4’s real-time GI solution – light propagation volumes – will take dynamic lighting from an animated emissive texture.
I recommend using a dynamic light with a light function, behind your emissive texture, that simply uses a blurred version of the same media to project onto the environment.