Thanks guys! Yes you are right, Arma 3 currently doesn't support PBR but I found it easier to work in Substance Designer and then tweak the resulting textures for use with the Arma 3 shaders.
Arma 3 doesn't support PBR, no - but you can fake some of the effects, just need someone who can understand the god-complex SDK tools. They've added a Jeep! This made my day, awesome model... As an A3 player myself I'm really looking forward to this!
Nice work and an excellent use of proxies / hiddenSelections. I'd be interested in hearing more about what tweaks you did from Substance to RV4 — what I've been doing is using adjustment layers in photoshop on my exported maps from Painter, as well as adding (Lin. dodge) the PBR-roughness map to the _SM maps G channel…
I based Arma's SMDI green channel on the PBR glossiness map, tweaked the contrast and added metallic map on top. The blue channel is mostly areas of flat color with baked lighting on top (for which I used Substance Painter's filter). The blue channel should have different value (specular power) for each surface type, what…