OTOY Forums

It seems that you cannot filter out the HDRI Environment from glass. Steps i have taken that should have worked :

1. Specular material on the object -> tick Affect Alpha
2. Kernel Settings -> Path Tracing (&PMC) enable Alpha Channel and untick Keep Environment.

Am i missing some steps or is this a bug? If not a bug please neglect my ignorance.

Enabling Affect alpha and enabling Alpha Channel should do the trick to make refraction not affected by the environment.
This works in Octane plugin 17.x (2018) but not in 18.x/20.0 which is based on Octane 2019. Looks like it is a core engine bug, the same happens in in Standalone.