Sheen in Unity doesn't match web result

[marwie]

Describe the bug 💬

Sheen effect in Unity does not match sheen in Needle Engine / three.js based viewer

unity:

web:

gltf.report

PBR graph:

Steps to reproduce 🔢

1. Download https://sketchfab.com/3d-models/retrowave-sportcar-low-poly-model-f239927bfe2643c1a3e6eb235f58b526
2. Extract body color material
3. Enable sheen
4. Set sheen color to blue and sheen roughness to 1
5. light sheen color in unity
6. export to glTF and open in https://viewer.needle.tools
7. Note sheen looks much stronger than in Unity

Files to reproduce the issue ♻

https://sketchfab.com/3d-models/retrowave-sportcar-low-poly-model-f239927bfe2643c1a3e6eb235f58b526

Editor Version 🎲

2021.3

Render Pipeline and version

12.1.13

UnityGLTF Version

2.14.1

Operating System 👩‍💻

Windows

When does this problem happen?

• Editor Import
• Runtime Import
• Editor Export
• Runtime Export

Additional Info 📜

No response

Validations 🩹

• I have searched existing issues: no issue already exist that reports the same problem.
• I follow the Code of Conduct
• I provided a minimal reproducible example, including files when necessary.

[marwie]

here's the model exported with UnityGLTF and sheen enabled

retrowave_sportcar_-_low_poly_model.zip