Thank you so much for the reply, and the heads up.
I have to say I find it kind of odd, that this is such a universally used facility…
Whether creating buildings, props, vehicles, and armour sci-fi, or medieval.
And seeing as so many people work in and love EEVEE, that it wasn’t something that was
implemented natively.
Or even, by now through an add-on.
But once again, I thank you, and appreciate your time, and help.
I don’t use Eevee, but I do my “Lookdev” in Cycles. Unfortunately isolate doesn’t work in Cycles, and Cycles doesn’t support Lookdev. So I’m forced to move my asset out of the scene (say 10m or whatever is appropriate), activate/change HDRI, change exposure, then start editing my materials. You don’t have to do all that if you only want to preview the mask, which you can then bake out for Eevee use.