Editing OpenSimulator Internals/Code Map/LLClientView (section)

== Notable Implementation Details ==

* AgentUpdate packets arrive roughly 10x/second per client even when idle. HandleAgentUpdate filters for significance (movement flags, body rotation beyond a near-1.0 cosine threshold, camera position/axis beyond a 0.01 delta) before invoking OnAgentUpdate/OnAgentCameraUpdate, and forces a full update at least every 500ms regardless.
* Sequence-number gating: HandleAgentUpdate drops any AgentUpdate whose sequence number is not strictly greater than the last one processed, to avoid reordered/duplicate UDP packets corrupting movement state.
* ObjectImage (texture updates) tracks a per-prim sequence number in objImageSeqs to discard stale/duplicate texture-set requests, expiring the tracking dictionary every 30 seconds.
* DeRezObject supports multi-packet reassembly (m_DeRezObjectDelayed) when a single de-rez request is split across packets by the viewer.
* CreateCompressedUpdateBlockZC has a large commented-out non-zero-encoded twin (CreateCompressedUpdateBlock) retained in source as a reference/fallback that is not currently compiled in.
* GetViewerCaps() reads capability flags from the CAPS module (SentSeeds, ObjectAnim, WLEnv/AdvEnv for windlight environment support, PBR, TPBR for terrain PBR) and caches which optional features (m_SupportObjectAnimations, m_SupportPBR, SupportTerrainPBR) this specific viewer connection supports, gating several of the update-encoding code paths above.
* SendEstateList, SendBannedUserList and related estate list sends batch at 63 entries per EstateOwnerMessage packet to stay under datagram size.

----