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By Design

By Design in 2022.2.X

Votes

0

Found in

2020.3.35f1

2022.1.3f1

2022.2.0a13

Issue ID

UUM-1335

Regression

Yes

DXT5 compression produces lower quality lightmap results when compared to 2019.4 LTS

Progressive Lightmapper

-

Steps to reproduce:

1. Make sure that you have WebGL platform support installed
2. Download and open attached project (New Unity Project.zip) and open SampleScene
3. Open the project in a 2019.4 LTS editor version
4. Observe the appearance of the Shaded view, and the Lightmap-0_comp_light file
5. Now open the project in any other editor version that is 2020.1.0f1 or newer
6. Notice the drop in quality both in the Shaded view, and the Lightmap-0_comp_light file

Notes:

- Reproduces in: 2020.1.0a15, 2020.1.0a17, 2020.1.0a22, 2020.1.0a26, 2020.1.0f1
- Does not reproduce in: 2019.4.38f1, 2020.1.0a1, 2020.1.0a13, 2020.1.0a14
- This issue was introduced in: 2020.1.0a15
- Prior to 2020.1.0a15, WebGL used DXT compression by default
- Overriding to DXT compression manually after 2020.1.0a15 results in quality reduction
- Post-2020.1.0a15 release WebGL uses RGB9E5 compression by default, but users cannot override to it manually: https://fogbugz.unity3d.com/f/cases/1424639/

  1. Resolution Note:

    This works by design. But work is scheduled to inform the user in the UI when non-optimal compression settings are used.

  2. Resolution Note (2022.2.X):

    This works by design. But work is scheduled to inform the user in the UI when non-optimal compression settings are used.

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