Specular Material changes between versions?

[moose69]

I have recently upgraded from 4.05 to the latest subscription version 2021.1.4-(R4)

I have opened up an old job to render out a new copy of a bottle visual I did previously and the specular material acts completely differently.

This is annoying as I want to do some amends and the material seems to act completely differently

There is no Post work PS other than applying the mask - all colour work correct 'in camera'

Is it the material or the lighting that has been change and is there a simple fix?

It is lit with a HDRI file and a single octane light

I have tried to adjust and it is not just a matter of changing the transmission.

It should be a 5 minute job but this complicates things trying to match

Do I need to reinstall 4.05 just for this?

Hmmmmmm

[aoktar]

There are too much changes since 4.05. Hard to say what's the source of differences. But we added color management for textures. Check is it "Linear sRGB+legacy gamma" in imagetextures. Also change "priority" parameter for glass and liquid materials. It's under common section.

[moose69]

Just turned off 'nested dielectrics' in the pathtracing kernel and it magically all went back to normal

I will investigate priorities further

thanks