sky_line/Slipstream

Fork 1

Epic: remove the scene octree / spatial partitions (built every frame, almost nothing reads them) #474

New issue

Closed

opened 2026-10-06 09:30:24 +00:00 by sky_line · 1 comment

sky_line commented

2026-10-06 09:30:24 +00:00

Owner

Audit (2026-10-06): the scene octrees are still built and maintained every frame:

13 partitions per region, plus the object-cache tree;
moved lists, partition moves, attachment bridge moves.

Yet almost nothing reads them under Vulkan. Rendering, culling, world picking, LOD, texture priority and lights all use our own systems.

Live readers today:

object-cache interest management (essential);
level-3 automatic probe placement;
rect-select;
particle-owner pick, which is broken (see the bug).

Several systems also read the per-object entry data (extents, centre, radius, camera distance, visibility stamps), not the tree itself.

Steps, easiest first:

#475 Delete dead code paths and restrict rect-select (trivial)
#476 Stop building the 9 partitions nothing reads (easy; per-avatar CPU win)
#477 Stop moving attachment and HUD bridges (easy-medium; crowd CPU win)
#478 Replace rect-select, level-3 probes and particle pick (medium)
#479 Replace VOCache interest management (hard; the core dependency)
#480 Move the entry data onto LLDrawable, then delete the octree code (refactor)

The per-mesh triangle octrees (llvolumeoctree, glTF primitives) are separate and stay.

Audit (2026-10-06): the scene octrees are still built and maintained every frame: - 13 partitions per region, plus the object-cache tree; - moved lists, partition moves, attachment bridge moves. Yet almost nothing reads them under Vulkan. Rendering, culling, world picking, LOD, texture priority and lights all use our own systems. **Live readers today:** - object-cache interest management (essential); - level-3 automatic probe placement; - rect-select; - particle-owner pick, which is broken (see the bug). Several systems also read the per-object *entry data* (extents, centre, radius, camera distance, visibility stamps), not the tree itself. **Steps, easiest first:** - [ ] #475 Delete dead code paths and restrict rect-select (trivial) - [ ] #476 Stop building the 9 partitions nothing reads (easy; per-avatar CPU win) - [ ] #477 Stop moving attachment and HUD bridges (easy-medium; crowd CPU win) - [ ] #478 Replace rect-select, level-3 probes and particle pick (medium) - [ ] #479 Replace VOCache interest management (hard; the core dependency) - [ ] #480 Move the entry data onto LLDrawable, then delete the octree code (refactor) The per-mesh triangle octrees (llvolumeoctree, glTF primitives) are separate and stay.

sky_line added the

epic

perf

labels

2026-10-06 09:30:24 +00:00

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 1: delete dead octree code paths #475

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 2: stop building the 9 partitions nothing reads #476

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 3: stop moving attachment and HUD bridges through the octree #477

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 4: replace the remaining tree readers (rect-select, level-3 probes, particle pick) #478

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 5: replace object-cache interest management (VOCache partition cull) #479

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Octree removal 6: move octree-entry data onto LLDrawable / LLVOCacheEntry, then delete llvieweroctree / LLSpatialGroup #480

sky_line referenced this issue

2026-10-06 09:30:24 +00:00

Hovering or clicking a particle never finds its owner object (particle pick broken under GPU particles) #481

sky_line added this to the Slipstream project

2026-10-06 15:04:14 +00:00

sky_line referenced this issue from a commit

2026-10-06 20:15:40 +00:00

Refs #475

sky_line referenced this issue

2026-10-06 21:37:15 +00:00

Octree removal 1: delete dead octree code paths #475

sky_line commented

2026-10-09 08:53:45 +00:00

Author

Owner

All steps done (#475-#480 closed). The scene octree is no longer built or maintained; its remaining readers (rect-select, level-3 probes, particle pick, object-cache interest management) run on our own systems, and the octree code is deleted. Shipped in 1.2.0 Beta 6.

sky_line closed this issue

2026-10-09 08:53:45 +00:00

No milestone

No project

No assignees

1 participant

Notifications

Due date

The due date is invalid or out of range. Please use the format "yyyy-mm-dd".

No due date set.

Dependencies

No dependencies set.

Reference

sky_line/Slipstream#474

No description provided.

Rows
Columns