I use Light Propagation Volumes (LPV) for dynamic direct lighting, and all materials work just fine except these which use refraction. The target goal is to create rain particles which use refraction with fresnel like in a famous Koola’s video: UE4 shader/fx test - YouTube . Unfortunately, when I drop a refraction material from Content Examples (M_Glass, M_RefractionDepthBias, etc.) or create one on my own, with or without Fresnel material function, it shows no refraction effect while all other channels (defuse, specular, opacity, etc.) are displayed all right.
Which version of the engine are you using? I’m pretty sure refraction and LPV work together in both 4.5 and 4.6 so there must be something else wrong with your project.
Thanks for the answer, Jacky!
I was using 4.4.3 due to temporal version incompatibility of some of the extensions. I will build 4.5 tonight to test again, thanks for the hint!