Hello, thanks for the exemple and taking the time to respond ! I think in your image it works because it’s using the surface cache for screen trace (sorry if my vocabulary is not 100 percent right) since it looks like it’s a bit low rez. If you disable screen trace and try to cranck up the reflection quality you may end up with the same error as my pictures above. I’m gonna reproduce it in a different settings and update it with all the detailed parameters and settings. The thing is that it works perfectly fine with the old subsurface model (without subdivision or without substrate) AND without using a subsurface profile.