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Haven't seen this mentioned here so I might as well 
Unreal 4 and other engines use an additional lightmap that has the direction of the main dominant light for those pixels encoded into it. This is then used in the shader in combination with the normal map to give additional shading.
This is mostly noticeable on rough surfaces.
Here is a screenshot of what directional lightmaps can offer:
And here is how it currently looks with Vray:
As you can see the difference is tremendous. Pretty much any surface that has normal maps will greatly benefit from this feature.
Unreal 4 and other engines use an additional lightmap that has the direction of the main dominant light for those pixels encoded into it. This is then used in the shader in combination with the normal map to give additional shading.
This is mostly noticeable on rough surfaces.
Here is a screenshot of what directional lightmaps can offer:
And here is how it currently looks with Vray:
As you can see the difference is tremendous. Pretty much any surface that has normal maps will greatly benefit from this feature.
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