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
- Crash on MonoBehaviour::CallMethodIfAvailable when performing various actions
- Incorrect rotations on bones when importing FBX animations with a Humanoid Rig
- Render Graph Viewer “Pass List” section is flickering when resizing vertically and the Render Graph Viewer window is docked
- Render Graph Viewer Capture button plays the click animation but does not do anything when the Capture button is pressed with the “Enter” key on the keyboard
- UI Builder Scrollview is unable to scroll all the way down when the window is downsized vertically
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/