# Objective
- Greatly reduce light leaks near corners of objects (but doesn't fix
general light leaks from tiny geometry)

## Solution
To prevent light leaks:
- When ray_t is smaller than the cache cell size, force the finest LOD
cache access.
- Make LOD much less aggressive
- Make the finest LOD smaller

Since this then greatly increases the number of cache cells in the
scene, I changed the following to prevent too much of a decrease in
performance (this PR is still a hit to performance though):
- Randomly skip updating some cells once we have more than 40,000 cells
active
- Aggressively prune older cache cells

Also some misc changes:
- Turn world cache query jitter back on (stabilizes glossy reflections)
- Split the DI/GI WC sampling steps into separate dispatches (small
performance win)
- Added a counter of current WC cell count to the example UI (using
#22326)

Ideally the skipped cells wouldn't be totally random, and we'd have
coarser-LOD cells update less frequently, but that would get very
complicated as we'd have to track the total amount of cells per LOD in
order to average out to `WORLD_CACHE_TARGET_CELL_UPDATES`.