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

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opened 2026-10-06 09:30:24 +00:00 by sky_line · 0 comments

sky_line commented

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

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Every attachment root of every avatar still goes through markMoved(mSpatialBridge) (lldrawable.cpp ~716-719) → mMovedBridge → LLSpatialBridge::updateMove (balance + part->move) every frame. RenderVKSkipAttachOctree does not cover this path. It's the largest remaining octree cost in crowds; the moved_bridge counter is in the RenderVKSectionLog GL-residue line.

Do: skip the bridge move for attachments and HUDs, or don't create LLAvatarBridge / LLHUDBridge at all (lldrawable.cpp ~1205-1220). Make sure LLCleanIngest::noteObjectMoved still fires where the clean pipeline needs it (pipeline.cpp ~843-844 currently piggybacks on bridge moves).

Measure: frame time in a crowded club before and after.

Part of #474. From the 2026-10-06 audit: the octrees are still built and maintained every frame, but almost nothing reads them. Rendering, culling, world picking, LOD, texture priority and lights all run on our own systems. Every attachment root of every avatar still goes through `markMoved(mSpatialBridge)` (lldrawable.cpp ~716-719) → `mMovedBridge` → `LLSpatialBridge::updateMove` (balance + `part->move`) every frame. `RenderVKSkipAttachOctree` does not cover this path. It's the largest remaining octree cost in crowds; the `moved_bridge` counter is in the RenderVKSectionLog GL-residue line. **Do:** skip the bridge move for attachments and HUDs, or don't create `LLAvatarBridge` / `LLHUDBridge` at all (lldrawable.cpp ~1205-1220). Make sure `LLCleanIngest::noteObjectMoved` still fires where the clean pipeline needs it (pipeline.cpp ~843-844 currently piggybacks on bridge moves). **Measure:** frame time in a crowded club before and after.

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

sky_line referenced this issue

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

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

sky_line added this to the Slipstream project

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

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