erik/acdream
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
275 commits 3 branches 0 tags 61 MiB
Commit graph

3 commits

Author SHA1 Message Date
Erik
6a5d8c1580 feat(core): port decompiled AC client physics — CollisionPrimitives + PhysicsBody 
Two major C# ports from the decompiled retail AC client (acclient.exe):

1. CollisionPrimitives (9 functions, 26 tests):
   - SphereIntersectsRay, RayPlaneIntersect, CalcNormal
   - SphereIntersectsPoly, FindTimeOfCollision
   - HitsWalkable, FindWalkableCollision
   - SlideSphere, LandOnSphere
   Ported from chunk_00530000.c functions FUN_005384e0 through FUN_0053a230.
   Cross-referenced against ACE's Physics/ C# port for algorithm verification.

2. PhysicsBody (7 methods, 31 tests):
   - update_object (top-level per-frame, sub-stepped at MaxQuantum=0.1)
   - UpdatePhysicsInternal (Euler: pos += v*dt + 0.5*a*dt²)
   - calc_acceleration (gravity=-9.8 when HasGravity)
   - set_velocity (clamp to MaxVelocity=50)
   - set_local_velocity (body→world via quaternion)
   - set_on_walkable, calc_friction (ground normal + pow decay)
   Ported from chunk_00510000.c/chunk_00500000.c.
   Struct layout confirmed against ACE PhysicsObj field offsets.

367 total tests green (258 core + 109 net). 57 new tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-12 23:54:51 +02:00
Erik
4d36756b91 research: full acclient.exe decompilation — 22,225 functions, 688K lines 
Complete decompilation of the retail Asheron's Call client using
Ghidra 12.0.4 + pyghidra headless. 22,225 of 22,226 functions
successfully decompiled in 75 seconds.

Output: docs/research/decompiled/ (54 files, 688,567 lines of C)

Key findings already identified:
- CLandBlockStruct::ConstructPolygons at chunk_00530000.c:2270
  (split direction formula with 0x0CCAC033 constants)
- Motion command handlers at chunk_00510000.c (0x45000005 etc)
- Motion interpreter at chunk_00520000.c
- Portal space UI at chunk_004D0000.c and chunk_00560000.c

Next: identify CPhysicsObj, CMotionInterp, collision, and movement
functions by cross-referencing against ACE's C# port.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-12 23:25:51 +02:00
Erik
370c6e3133 research: decompile acclient.exe terrain/physics via Ghidra headless 
Used Ghidra 12.0.4 + pyghidra to decompile 368 functions from the
retail AC client binary (acclient.exe, 4.7MB, 2016).

Output: docs/research/acclient_decompiled.c (13,560 lines)

Confirmed the decompiled code matches ACME's ClientReference.cs:
- ConstructPolygons split formula at ~0x00532610 with constants
  0x0CCAC033, 0x6C1AC587, -0x421BE3BD, -0x519B8F25
- Same 2.3283064e-10 float comparison for split direction

Regions decompiled:
- 0x530000-0x536000: CLandBlockStruct + terrain (85 functions)
- 0x536000-0x540000: nearby functions (168 functions)
- 0x5A9000-0x5AB000: LandDefs region (111 functions)

Tools: tools/decompile_acclient.py (pyghidra headless script)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
 2026-04-12 23:18:27 +02:00