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Fixed
Votes
1
Found in
2017.4
2019.3.5f1
2020.2
Issue ID
1228716
Regression
No
Generated Lightmap has visual artifacts when using Progressive CPU/GPU Lightmapper
How to reproduce:
1. Open the attached project's "case_1228716-Project.zip" Scene labeled "test2"
2. Open the Lighting Settings (Window->Rendering->Lighting Settings)
3. In the Lighting Window, select the Progressive CPU/GPU Lightmapper
4. Press "Generate Lighting"
5. Wait for the Lightmap baking to finish
6. Observe the Scene View
Expected result: Generated Lightmap doesn't have any artifacts
Actual result: Generated Lightmap has visual artifacts
Reproducible with: 2017.4.19f1, 2018.4.20f1, 2019.3.6f1, 2020.1.0b3, 2020.2.0a5
Note: Using Enlighten Lightmapper doesn't reproduce the issue
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Resolution Note:
This is not a bug. The artifacts are caused by the invalid GI texels produced by the shadow casting plane's backface. To fix this issue you need to enable the double-sided GI support on the material inspector. This feature is supported by both CPU and GPU Progressive Lightmappers.
Steps to fix the issue:
1. Create the new material and assign it to the 'Plane' gameobject (shadow caster);
2. In the material Inspector enable "Double Sided Global Illumination" checkbox;
3. Rebake the GI either with CPU or GPU Lightmapper.
Attaching the screenshot, fixed project and resolving the case by design.