Parse the complete PhysicsDesc plus F754/F755 packets, correct every PhysicsState bit, and gate all nine retail update channels with generation-safe immutable snapshots. Preserve ForcePosition, teleport, placement, velocity, parent, pickup, delete, and same-generation CreateObject ordering from the named client.
Separate accepted logical lifecycle notifications from retained UI qualities, make GUID replacement and session reset clear every projection exactly once, and add packet, wraparound, malformed-input, parent FIFO, canonical-position, reconnect, and GUID-reuse conformance coverage.
Co-Authored-By: Codex <noreply@openai.com>
Companion to the Phase 6.6 UpdateMotion parser. Without this, every
server-spawned entity stays frozen at its CreateObject origin forever
— NPCs don't patrol, creatures don't hunt, other players don't walk
past. UpdatePosition is the per-entity position delta the server sends
on every movement tick.
The wire format is straightforward but fiddly:
u32 opcode | u32 guid | u32 flags | u32 cellId | 3xf32 pos
(0..4) conditional f32 rotation components, present iff the
corresponding OrientationHasNo* flag is CLEAR
optional 3xf32 velocity iff HasVelocity
optional u32 placementId iff HasPlacementID
four u16 sequence numbers (consumed but not used)
Layout ported from references/ACE/Source/ACE.Server/Network/Structure/
PositionPack.cs::Write and ACE.Entity/Enum/PositionFlags.cs.
WorldSession dispatches PositionUpdated(guid, position, velocity) on
a successful parse. GameWindow wiring (guid → WorldEntity lookup and
transform swap) is deferred to the same follow-up commit that lands
Phase 6.6 wiring, after the in-flight Phase 9.1 translucent-pass work
merges so we don't step on GameWindow.cs edits.
96 Core.Net tests (was 89, +7 for UpdatePosition coverage).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
