The old Specular Fog Plane trick in 2020.x

[frankmci]

I find myself needing to do some fast fog again, having not done it in a year of more, and all my old scenes with Fog Planes using a Specular Material with a Scattering Medium, IOR of 1, Transmission of 1 no long render properly in Octane 2020.x. This has be my fast go-to fog for years, and I'm sad to see it broken. I remember some conversations here in these forums about the changes in the way scattering is calculated that impact this old trick, but I'm having trouble tracking down the relevant threads, and I can't seem to find a cantrip to get it working again.

So is the Specular Fog Plane trick just not doable anymore, or is there some option I'm missing to get this old friend working again?

Here's the way I used to do it, from a conversation back in late 2019:
viewtopic.php?f=9&t=72603&p=374379&hilit=pixar#p369014
viewtopic.php?f=44&t=72510&p=368100&hil ... er#p368100

Thanks for any suggestions or pointers to the relevant threads.

[bepeg4d]

Hi Frank,
I have tried with one of my scenes made with the same technique, and everything seems to work as expected here in 2020.2-RC6:

What kind of issues are you having exactly?

ciao Beppe