secondlife / secondlife/viewer
glTF Mesh upload: inverted Y axis in UVs
@Geenz is already working on this.
Since Mar 30, 2026.
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- C++
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Description
Environment
Second Life Release 26.1.0.22641522367 (64bit)
Release Notes
You are at 114.3, 132.0, 20.9 in Avalon Aviary located at simhost-0caa2e4080ef1beab.agni
SLURL: https://maps.secondlife.com/secondlife/Avalon%20Aviary/114/132/21
(global coordinates 252786.0, 288132.0, 20.9)
Second Life Preflight 2026-03-04.22660319648
Release Notes
CPU: Apple M4 Max (2400 MHz)
Memory: 49152 MB
OS Version: macOS 26.3.0 Darwin 25.3.0 Darwin Kernel Version 25.3.0: Thu Jan 22 21:54:32 PST 2026; root:xnu-12377.80.0.501.1~2/RELEASE_ARM64_T6041 arm64
Graphics Card Vendor: Apple
Graphics Card: Apple M4 Max
OpenGL Version: 4.1 Metal - 90.5
Window size: 1980x1120
Font Size Adjustment: 96pt
UI Scaling: 1
Draw distance: 128m
Bandwidth: 3000kbit/s
LOD factor: 1.375
Render quality: 3
Texture memory: 38338MB
Disk cache: Max size 2150.4 MB (100.0% used)
HiDPI display mode:
J2C Decoder Version: KDU v8.4.1
Audio Driver Version: OpenAL, version 1.1 ALSOFT 1.24.2 / OpenAL Community / OpenAL Soft: OpenAL Soft
Dullahan: 1.24.0.202510081737
CEF: 139.0.40+g465474a+chromium-139.0.7258.139
Chromium: 139.0.7258.139
LibVLC Version: 3.0.21
Voice Server Version: Secondlife WebRTC Gateway
Packets Lost: 21/3366 (0.6%)
March 07 2026 14:53:55
Description
When uploading glTF mesh files, the Y axis on UVs get inverted causing textures to be flipped upside down. See screenshot of expected vs. actual.
The specific asset is the "Water Bottle" asset taken from the glTF example asset repo: https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/WaterBottle/glTF
Reproduction steps
- Upload a glTF file - specific configuration in the model import dialog doesn't matter.
- Rez the object
- Upload its accompanying material into your inventory
- Drag and drop the material onto the object
- Verify that the UVs are flipped or not by inspecting the mesh and comparing it to something like the glTF sample viewer or blender. Really any glTF viewer will do.
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Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Assessment
This issue has not been assessed yet.