[Hackathon] Faster On-Hover Raycasting in 3D viewport

[daniel-wer]

Hackathon 2024 project

• Use BVH optimized raycaster
• Merge geometries of a single (agglomerate) mesh into one geometry, saving render passes
• Don’t create groups for these meshes, so a single BVH is built per agglomerate mesh

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• abc

TODOs:

• Restore 3D Viewport Proofreading
• Mesh Colors changed after threeJS update

Issues:

• fixes Consider BVH do speed up raycasting in 3D viewport #7832

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(Please delete unneeded items, merge only when none are left open)

• Updated changelog
• Updated migration guide if applicable
• Updated documentation if applicable
• Adapted wk-libs python client if relevant API parts change
• Removed dev-only changes like prints and application.conf edits
• Considered common edge cases
• Needs datastore update after deployment

[daniel-wer]

Thanks for updating the title and PR description @fm3 :)

I'll continue with restoring the 3D viewport proofreading using vertex colors once I'm back in office. I'll also have a look at the washed out colors then.