viewer: double clicking an entity in the blueprint should put it into focus

[teh-cmc]

(Following a standup discussion)

For spatial entities, double-clicking on their name in the blueprint should:

1. make their centroid the focus of the orbit camera
2. zoom out the camera so that the entire entity can fit on screen

Both can be achieved relatively easily by computing bounding spheres (e.g. here's how Bevy's scene_viewer handles this), though this might lead to potentially undesirable edge cases in some very specific scenarios (very oddly shaped meshes, point clouds with extreme outliers, etc).

Future work

Possible future work mentioned during the discussion:

• Could offer a way for end-users to specify custom centroids/focus-points and optimal zoom-out distances using e.g. dedicated components

[Wumpf]

the note on bevy is nice but handles only meshes and we do already have bounding volumes for meshes. everything else is the issue, some of which we create visualizations on the fly (e.g. a transform should be shown as 3 arrows)

[Wumpf]

Note that once we do this properly, bounding_box on SpatialScene should consider building itself up from the same bounding primitives instead of going through all rendering primitives (which in the future might not be freely traversable as they may reside in write-only gpu memory; plus we might add stuff that isn't logged data which shouldn't be in the scene bounding box)