How to use VisibilityCut - building shader variation ??

[ReddogSoW]

I'm trying to get some roller door animations to work and I see from some of the newer maps that these types of doors appear to all have been taken from the same source, and have textures linking back to the Rudolf Hormann Chicken Barn Big which is odd as that placeable doesn't even have the type of door I'm talking about!

Does anyone know what the pre-requisites are for using the VisibilityCut shader variation are, and how it works?