Glass Comp Math - Not working

[Morne]

Hi Guys

So if I have the beauty of Glass

and I substract:
Reflection
Refraction
Specular

Am I suppose to get just the black Glass?

I'm not getting that. I'm still ending up with the beauty, but maybe half the exposure

This is a test with VRay 5 hotfox 2, 32bit comp in PS

[^Lele^]

It works here (even though my reflection is black, as everything is in the specular, in my case.).
See attached.

[Morne]

It works here (even though my reflection is black, as everything is in the specular, in my case.).
See attached.

Yeah I might need to redo this using Fusion, not sure PS can be trusted with 32bit

I'll revisit this soon!