Per Licensee:

 I noticed that the Volumetric Lightmap does not build at correct density if an object is under the level of the terrain. Is this a feature or a bug? I'm creating a under-terrain dungeon and I need to have high density samples also under the terrain level.

Steps to Reproduce
  1. Open attached project
  2. In Viewport, Show > Visualize > Volumetric Lightmap

Result: All meshes placed above the landscape produce high density lighting samples within the Lightmass Importance Volumes surrounding them, but not if they are placed below a landscape

Expected: A higher density of samples will be produced around static geometry within a Lightmass Importance Volume even if it's below a landscape

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-59047 in the post.

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By Design
Affects Versions4.
CreatedMay 11, 2018
ResolvedMay 16, 2018
UpdatedMay 18, 2018