rule of thumb regaring sRGB vs linear colors

[Riley1389]

@Vailias;536600

From what I recall if you’re working in a PBR workflow in SD the maps that get output are already in linear space, even if your intermediate images are in sRGB.

So when you bring them in to Unreal leave sRGB off.

However, if you have a convert to linear node in substance you’re performing the sRGB to linear conversion first, then again when the map is output, so turning on sRGB in Unreal just undoes the second gamma correction and gets the final texture back to linear space.

Partially yes, but there’s a little more to it than that. From my understanding, Substance Painter/Designer their rendering system for PBR is slightly different in how it calculates the lighting samples than UE4 is, so it usually doesn’t end up being a perfect transition from SD/SP to UE4. However, there’s a guy who made a UE4 specific shader for Painter, I haven’t tried to use it with SD yet, though. However, I’ve gotten much better end results using it.

Here’s the link to his shader: How about PBR?: Substance Painter Shader - Unreal Engine 4(update)