Objects Become Black When Baking Lighting, Any Solutions?

Development Rendering
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Super confused as the why this happens. Had this problem for a while, and can’t seem to get an appropriate solution to my problem.

Lighting after baking (without lumen):
image

Lighting before baking (without lumen):
image

The materials that turn black also appear slightly darker before baking. I’ve tried lots of different things, but not sure what’s going on. I’d appreciate any help! Thanks.

FTR, I have a LightmapImportanceVolume, skylight, sky atmosphere and a reflection capture. The light is mainly being produced from lamps on the ceilings which are pointlights. I am using Unreal Engine 5.0.3

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What does the normal buffer view look like?

image
image482×769 72.3 KB

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Looks like this. Same when baked.

image

4

Several things to check there, to try to refine to where may come the problem, in addition to Arkiras suggestion:

  • Check for geometry scale. Is it quite big scale factor ?
  • Check for Warnings in the light baking report
  • Check if your UVs are correctly setup (UV 0 for lightmap => does it looks good ?)
  • What happens if you duplicate the geometry with the problem, does the problem occurs on the clone too ?
  • Test with GPU Lightmass, just to see if this happens too

What is the mobility of the various lights (static ? stationary ?). Same question for the geometry.

5

In the viewport do: “Viewmode >> Optimzation Viewmodes >> Lightmap Density”.

If the mesh surfaces are flat, the material UVs aren’t setup for lightmaps. If the material surfaces are checkerboards, they are good.

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6

Adding the Reflection Capture fixed the issue for me. I just inserted the Box Reflection Capture as global map reflection and the problem was gone. Hope this helps even if it’s this late answer

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