Reported by our licensee Gungho.

Reproduced in 4.21.2, win10

Steps to Reproduce

Open SamleLightMap project with vanilla 4.21.2

Download project here [Link Removed]


Open NewMap

Reimport the assets in to  /Game/Asset/Common/Stage/S020_Stg_UK/StMsh/Building/

Build the lightnings (Preview).


Notive the areas circled in red in the 2 png after the lightnings have been built.



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Affects Versions4.21.2
CreatedFeb 4, 2019
UpdatedMay 9, 2019