Search Issue Tracker
Won't Fix
Under Consideration for 2022.3.X
Votes
0
Found in
2021.3.21f1
2022.3.18f1
2023.2.0a6
2023.3.0a3
6000.0.0b11
Issue ID
UUM-30368
Regression
No
[URP/HDRP] Decals have artefacts along geometry edges when mipmapped
Reproduction steps:
1. Open the user’s attached project "URP Beta.zip"
2. Select Assets > Textures > “Decal.png”
3. Enable “Generate Minimap”
4. Press Apply in the Inspector
5. Observe Scene View
Expected result: Decal is rendered without artefacts
Actual result: Decal is rendered with artefacts
Reproduced with: 2021.3.21f1, 2022.2.11f1, 2023.1.0b8, 2023.2.0a6
Could not test with: 2020.3.46f1 (Due to errors)
Reproducible on: macOS 13.2.1 (Intel), Windows 11 (by user)
Note: Issue reproducible in Editor and Player mode
Add comment
All about bugs
View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.
Latest issues
- Mono Windows Builds don't produce full log callstacks when generating logs
- AssetBundles fail to load when running in Built Players for Mobile Devices
- UI elements with text gets bigger and grey when Player window is moved to another screen with different resolution
- System name accepts multiline text but crops it on confirmation, duplicates input, and shrinks the field when empty
- UI element scale and position are wrong in project build when DRS is changed with HDR and Software Dynamic Resolution enabled
Resolution Note:
From the description and screenshots I suspect this is the problem: There's a fundamental issue with projected screen-space decals where texture coordinate derivatives have high values at geometry borders due to the depth discontinuity, which ends up sampling low resolution mips at geometry borders causing the artifact. There's no proper fix for this but I "fixed" (or rather reduced) the issue in HDRP on emissive decals some time ago, with manual LOD calculation and clamping the LOD with depth derivatives (DecalData.hlsl, line ~35). Here's some details about the fundamental issue: https://bartwronski.com/2015/03/12/fixing-screen-space-deferred-decals/