Are portal lights still a thing? Wasnt there a tick box for this under the parameters for the rectangular light?
Hello @ValeroStudio ,
The Portal Light option in V-Ray Rectangle light is now a legacy option and is no longer exposed in the UI. Rectangle lights in files saved with previous V-Ray versions and this option enabled will still have it available. Regardless, for best performance consider disabling it and using the Adaptive Dome Light option instead.
You can find more information about the Adaptive Dome Light option here.
This is very good info. Thank you.