VRay Materials becomes too dark when using specular/reflective map

Development Architectural and Design Visualization
1

I’m fairly new to Unreal Studio, and just can’t figure out why the vray materials I export from 3ds Max, using Unreal Datasmith, turn out so dark in Unreal.
Can anyone help me, and explain why this is happening?

Screenshots below:

This is how it should look (I turned off the specular and metallic maps)

2

Yeah, it looks like the metallic maps are ending up way too high, I’d just modify the material in UE4 since it can be much simpler.

3

There are improvements to this coming in 4.22 I believe.

4

Is that the material unreal studio creates? - This doesn’t look like a PBR material.

You could use the specular map (or one of the diffuse channels as a matter of fact) as roughness map. Put the specular map through a ONE-1 node and then ADD a ‘scalar parameter’ to tweak it. This would be a simple way to make a PBR material. Leave metallic and specular empty