Description

Generate Lightmap UVs fails very frequently on FBX imported meshes. 

Found in 4.22 CL# 7053642, 4.23 CL# 8386587, 4.24 CL# 8971176

Steps to Reproduce
  1. Open the Editor
  2. Import any of the FBXs in the attached file
  3. Open UV Channel 2 of the imported mesh
  4. Place the mesh in the scene and build lighting

Results:
There will be a dense cluster of overlapping lightmap UVs in the top left corner and when lighting is built it will give bad results

Expected:
Proper light map UV is generated reliably

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-80751 in the post.

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Unresolved
ComponentTools - Import
Affects Versions4.224.234.24
CreatedSep 24, 2019
UpdatedOct 28, 2019