WHY?

Improve the time-to-first presentation
Improve the perception of the loading experience:
- Instances should appear gradually
- The scene can be manipulated during the loading process.
- A loading indicator in PowerBI which will not obfuscate the view.

TODO

[x] Implement the simplest thing that could possibly work to have instances appear as they are acquired from the storage back-end.
[x] Implement fonctionnal mesh merging
[x] Implement proper opaque/transparent code path
[x] Implement existing viewer API in merge path
[x] Implement PBI ready API
[x] Perform a preliminary integration in PowerBI for testing purposes
[x] Adapt the old VIM loading pipeline into the new loading pipeline (insertable mesh)
[x] Implement basic mesh instancing
[x] Implement existing viewer API in instancing path
[ ] Test with Skanska x 5 (use vimtool to merge) in PowerBI