//IBL Standard
1-albedoMap(diffusemap)
2-decalMap(diffusemap) rgb-? a-yes,use as normal. An overlay texture, channel 2? Only works if you export an IBL standard shader with map on channel 2.
3-aoSpecularAMap(bumpmap) r-ao? g-spec? b-
4-metallicRoughnessMap(bumpmap) r-metal? g-rough? b-
5-normalMap(bumpmap) no blue channel, maybe another normal map on a different channel
6-aoSpecularBMap(bumpmap) maybe a second ao map on another channel
7-functionMap(bumpmap) - leave empty

no blue channel?
xxx_UV number = channel(0=1,1=2,etc)?

//IBLRoadBasic
albedoRoughMap- rgb-Colour Alpha-Roughness
overlayMap- mult map with roughness alpha? 2k image now
grooveMap- r-colour? g-roughness? b-empty
marbleDustMaskMap- r-colour? g-roughness? b-empty
aoSpecularMap- r-ao g-spec? b-empty
overlayWetMaskMap- r- g- b-empty
sBlurredRefTexture- Empty

//TerrainBasic - I think it's the same as the old shader, with vert channels etc
albedoRoughAMap(diffusemap): 1st grass tex, rough in alpha
albedoRoughBMap(diffusemap): 2nd grass tex, rough in alpha
functionMap(bumpmap): Maybe mult map for 1st and 2nd grass?
mixSpecularMap(bumpmap): Mix map, no blue,
albedoRoughCMap(diffusemap): 3rd grass tex, rough in alpha
normalAMap(bumpmap): 1st and 2nd grass normal
normalBMap(bumpmap): 3rd grass normal


//Carbody
baseCoatRoughness- reflection %, 0 full, 1 nothing
baseCoatSpecStrength- brightness of reflections, don't go above 1
clearCoatSpecStrength- reflection % again, I guess over the base
clearCoatRoughness- clearness of cube map, anything other than 0 is blurred
clearCoatRefractiveIndex- Higher numbers make chrome effect
baseCoatRefractiveIndex- Brightens reflection?
lacquerColour-
metallicFlakeColour-
metallicPaintStrength-
metallicFlakeStrength-