Hi, I have a problem with rendering a unlit type of material in my game, my version is 5.3.
I created a basic Niagara system that uses DefaultSpriteMaterial and in Niagara editor it looks like this:
Perhaps your materials are flipped away from the camera?
Try turning on 2 sided in the material for tests (not recommended long term).
If they show up ok then your particle faces are flipped, not facing the camera.
So after all I figured out that’s something wrong with my light setup - I didn’t change anything after I created a game from simulation preset. With that light setup those effects doesn’t work. I copied default light from third person template and now it works fine.