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Fixed in 2023.1.0b1



Found in


Issue ID




Mixed light is both baked and realtime when converted to fully baked



When investigating UUM-14672 Volumetric Fog and Dynamic Shadow disappear on a GameObject when baking a Lightmap with the GameObject disabled, then enabling the GameObject and re-baking the Lightmap - Unity JIRA ( we discovered a regression in 2023.1. A mixed light is both baked into the lightmap and rendering as real-time when falling back to fully baked because we are out of shadow mask channels.


How to reproduce:
1. Open the user project here 


2. Open Scene “ISS_LightBakeTest“ (Assets/Scenes)
3. Bake the Lightmap (Window > Rendering > Lighting, 'Generate Lighting')
4. Activate the “TestLight” GameObject
5. Re-bake the Lightmap (Window > Rendering > Lighting, 'Generate Lighting')

Expected result: The directional light and three of the four spot lights have a channel in the shadow mask map and produce dynamic shadows. The last spot light is fully baked.
Actual result: a spot light light is both rendering as real time AND has direct lighting baked into the lightmap.





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