For Qt6 only, works with H21.
- [added] init H21.0 support
- [added] init PySide6/Qt6 support
- [dropped] PySide2/Qt5 support
- [dropped] Py3.9 & Py3.10 support
- [fixed] RuntimeErrors when HDRI`s displayed in Viewer
- [fixed] prevent “uv” attrib for Polyhaven Models import as .usdc
- [fixed] API MaterialX “category” selection
- [fixed] unload “ASSET_LIB_ADD” vars when switching between USER/JOB mode
- [fixed] Highpoly source geo selection for Megascans assets
- [changed] applying HDRI to new Octane 2025 render targets UI
