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feat(core): port decompiled AC client physics — CollisionPrimitives + PhysicsBody

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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>
This commit is contained in:
Erik 2026-04-12 23:54:51 +02:00
parent 21fd550909
commit 6a5d8c1580
36 changed files with 989 additions and 0 deletions
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tools/ghidra_project/acclient.rep/project.prp Normal file
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<?xml version="1.0" encoding="UTF-8"?>
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<STATE NAME="OWNER" TYPE="string" VALUE="erikn" />
</BASIC_INFO>
</FILE_INFO>