Description

User report: With 4.15 using only auto generated LOD's static mesh LOD levels can't share computed lightmaps anymore. This cause severe memory increase and it's making lightmass build times way slower. It's also cause visible LOD's popping even with production quality lights. With 4.14 lightmaps could be shared between LOD's.

Steps to Reproduce

Rebuild lighting on a level with staticmeshes with LODs created in the StaticMesh editor
Compare generated lighting filesize and build times

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Fixed
ComponentUE - Graphics Features
Affects Versions4.15
Target Fix4.15.1
Fix Commit3324755
CreatedFeb 21, 2017
ResolvedFeb 28, 2017
UpdatedApr 27, 2018