Substance painter 2 - UE4 workflow Issues

Lycanthropvnk

Hello!
I've recently started trying to get my maps produced in substance painter 2 to appear as intended as materials in UE4 and am having some issues.
The first prop I'm working with to learn the ropes is a barrel I've modelled in 3ds Max. Currently I'm having issues trying to get the material for this prop to reflect the one I've created in substance painter, or even close to it.

Below is the material as it appears in Substance painter:


And here is the result in UE4:


As you can see, it appears much darker and has issues with the metallic and roughness channels.

As per the suggestion of a friend, I added a constant and have added this as an input in addition to the texture sample itself into a multiply node which mitigates the issue but does not allow me to match the original material in Substance painter, or even close to it.

Below is my current material in UE4:



If anyone could suggest means by which I can amend the Metallic / roughness channels to better reflect the original material in substance painter I'd really appreciate it.
Below is a link to my Low poly and various maps if it helps:
https://www.dropbox.com/sh/168wmwtxuqb78sp/AABW_cLA-WTtGqiSBlhIKnZRa?dl=0

Thanks and best wishes to you all!

rexo12

Make sure you uncheck sRGB in your texture settings.

EDIT: thought I should clarify, uncheck sRGB for your metallic and roughness maps. These images store shader data, and gamma conversions will alter the colour of the texture maps, making your material seem much shinier/less metallic than it actually is.

jesusblasco

I would merge the metallic and roughness maps into a single texture using substance painter UE4 template, after that like rexo12 told, inside UE4, click on your rough/metallic textures and uncheck sRGB, that will make your textures look good inside UE4.

Lycanthropvnk

Thanks guys! I think that's done the trick Just to be sure, am I correct in saying that using the UE4 template in Substance painter I should hook up the red channel to the AO, the Green to roughness and the blue to Metallic?

rexo12

Yep! that sounds about right. Allegorithmic has a lookup table in their documentation: https://support.allegorithmic.com/documentation/display/SPDOC/Unreal+Engine+4

Obscura

The main issue hear is that you treat the paint as like half metal and therefor you get mostly specular lighting multiplied by that dark base color. In stubstance it probably looks that bright because you use some higher exposure. Paint isn't metal...

EarthQuake

Yep, was just gonna say you have near white values here, but you don't have any metal in this texture, only rust and paint.



Notice how low the reflectivity is, and how matte the surface is.

These barrels usually start out looking like this:



But by the time they are as rusted as yours, the finish with be quite scuffed and worn down.