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By Design
Votes
0
Found in
2021.3.37f1
2022.3.24f1
2023.2.19f1
6000.0.0b15
Issue ID
UUM-69582
Regression
No
Lightsmaps have artifacts when baking one sided meshes with rotation
Reproduction steps:
1. Open the “ReproProject“ project
2. Open the “Assets/Scenes/Level/Londres/lon_sco_01_street_morning“ scene
3. Open the Lighting window (Window > Rendering > Lightning)
4. Click on the “Generate Lighting” button in the Lighting window
5. Observe the “_SetGeometry/lon_sco_street/BuildingMain“ GameObject in the Scene view
6. Select the “_SetGeometry/lon_sco_street/fake_buildings“ GameObject in the Hierarchy window
7. Change the scale on the Z axis to “1” in the Inspector window
8. Repeat step 4
9. Repeat step 5
Expected result: The Lightmaps look the same
Actual result: There are black artifacts on the “_SetGeometry/lon_sco_street/BuildingMain“ GameObject
Reproducible with: 2021.3.37f1, 2022.3.24f1, 2023.2.19f1, 6000.0.0b15
Reproducible on: Windows 11 Pro (22H2)
Not reproducible on: No other environment tested
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Resolution Note:
When flipping around the fake_buildings (by reverting the negative z scale) the fake buildings are pointing away from the main building. This means when lighting the main building the GI system sees the large backface exposed by the fake_buildings. To fix this either make sure the front face of the buildings is exposed or make the material used for the fake buildings have "Double Sided Global Illumination" enabled. See https://docs.unity3d.com/Manual/class-Material.html