Decodes the CreateObject (0xF745) game message body far enough to hand
an entity off to acdream's existing IGameState/MeshRenderer pipeline.
Ported from ACE's WorldObject_Networking.cs (SerializeCreateObject,
SerializeModelData, SerializePhysicsData) and Position.cs.
Scope: the parser extracts exactly three fields —
- GUID (u32 right after the opcode)
- ServerPosition (landblockId + XYZ + rotation quaternion), if the
Position bit is set in the PhysicsDescriptionFlag
- SetupTableId (setup dat id for the visual mesh chain), if the
CSetup bit is set
Everything else in a CreateObject body (weenie header, object description,
motion tables, palettes, texture overrides, animation frames, velocity,
acceleration, omega, scale, friction, elasticity, translucency,
default scripts, sequence timestamps, ...) is consumed-or-skipped with
just enough bytes to advance past the correct flag-gated sections.
The parser stops at the end of PhysicsData — we don't need weenie-header
fields for rendering placement.
Components parsed in order (all from ACE's serialize routines):
1. Opcode u32 (must be 0xF745)
2. u32 GUID
3. ModelData header (byte 0x11 marker, byte subPaletteCount,
byte textureChangeCount, byte animPartChangeCount), followed by
PackedDword palette/subPalette fields, texture change records,
anim part change records, aligned to 4 bytes at end
4. u32 PhysicsDescriptionFlag
5. u32 PhysicsState (skipped)
6. Conditional Movement/AnimationFrame section
7. Conditional Position section (LandblockId, X, Y, Z, RW, RX, RY, RZ)
8. Conditional MTable/STable/PeTable u32 ids (all skipped)
9. Conditional CSetup u32 (extracted as SetupTableId)
The PackedDword reader is a new helper: AC's variable-width uint format
where values ≤ 32767 encode as a u16, larger values use a marker bit in
the top of the first u16 and a continuation u16. Ported from
Extensions.WritePackedDword.
LIVE RUN AGAINST THE ACE SERVER (test account, Holtburg):
step 4: CharacterList received account=testaccount count=2
character: id=0x5000000A name=+Acdream
character: id=0x50000008 name=+Wdw
sent CharacterEnterWorldRequest
step 6: CharacterEnterWorldServerReady received
sent CharacterEnterWorld(guid=0x5000000A)
step 8 summary: 83 GameMessages assembled, 68 CreateObject,
68 parsed, 52 w/position, 68 w/setup
First 10 parsed CreateObjects:
guid=0x5000000A lb=0xA9B40021 xyz=(104.89,15.05,94.01) setup=0x02000001
guid=0x80000600 no position setup=0x02000181
guid=0x800005FF no position setup=0x02000B77
guid=0x80000603 no position setup=0x02000176
guid=0x80000604 no position setup=0x02000D5C
guid=0x80000694 no position setup=0x020005FF
guid=0x80000697 no position setup=0x02000921
guid=0x80000601 no position setup=0x02000179
guid=0x80000605 no position setup=0x02000155
guid=0x80000695 no position setup=0x020005FF
The first line is +Acdream himself — GUID matches what we picked from
CharacterList, landblock 0xA9B4 is Holtburg (the area we already render),
setup 0x02000001 is the default humanoid player mesh. The other 67 are
NPCs/weenies/scenery-weenies in the same area; the 16 without positions
are inventory items whose position is inherited from the parent.
ALL 68 CreateObjects parsed cleanly — no short reads, no format errors.
Phase 4.7d proves byte-level compatibility with ACE's outbound network
serialization format. The remaining Phase 4 work (WorldSession type +
GameWindow wiring) is glue code above a codec that now speaks the real
AC wire format.
Tests: 77 core + 83 net (+1 live test) = 161 passing, all green.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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