This problem is getting more obvious while Roughness value is getting bigger, 1 get maxmum difference

If surface has Normalmap applyed, because of this problem, bumpness effect is weaker on Mobile

It's a very old problem, I don't know which version it started, at least more than one and half years old

one of UDN issue

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Steps to Reproduce

Unzip the folder attached into Content folder of 4.26 engine and open the map inside. 

Switch between Mobile/ES3.1 and PC/SM5, see the difference. 

The reflection looks much darker on mobile preview vs pc

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Have Comments or More Details?

There's no existing public thread on this issue, so head over to AnswerHub just mention UE-106218 in the post.

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ComponentPlatform - Mobile
Affects Versions4.26
CreatedJan 13, 2021
UpdatedJan 14, 2021