Worked on enhancing the BabylonJS/Babylon.js repository by refactoring the ViewerElement rendering path to improve UI extensibility. Focused on front-end development using TypeScript and web components, the work introduced protected render hooks for the progress bar, toolbar, and overlay, allowing for easier customization and future feature integration. The main render flow was consolidated and simplified to orchestrate these UI components more effectively, streamlining the process for developers to extend or modify the viewer interface. This targeted update addressed the need for a more modular and maintainable rendering structure, laying groundwork for ongoing improvements to the Babylon.js viewer experience.