4.20 fbx import - generate lightmap uvs doesn't update the lightmap coordinate index

Development Rendering
, , ,
1

Up to 4.19, when importing an fbx file and using ‘generate lightmap uvs’, the light map coordinate index would be updated (changed to 1 if only 1 channel was present in the original fbx). In 4.20, the lightmap coordinate index isn’t updated (still 0) resulting in black objects after building lighting.

Easy to replicatie;

  1. import an fbx (an object with a material + texture), use ‘generate lightmap coordinates’
  2. edit the imported StaticMesh
  3. under ‘general settings, the lightmap coordinate index’ will still be 0
2

Same thing happened to me in 4.20. Cant believe epic didn’t saw this. Maybe they have fixed this in the hotfix update. BTW I am going back to 4.19. This sucks !!!