Erik 50c0704ada research: complete acclient.exe function map — 70+ identified functions

Maps decompiled functions to their real AC class::method names by
cross-referencing against ACE's C# physics port. Covers:

- CPhysicsObj (13 functions): Euler integration, velocity, gravity,
  collision dispatch, friction, contact checking
- CMotionInterp (18 functions): full motion state machine including
  jump, movement, velocity computation, motion dispatch
- CLandBlockStruct (7 functions): terrain mesh construction, split
  direction, UVs, water depth, normal lighting
- CLandBlock (6 functions): landblock lifecycle, static object loading,
  cell management, neighbor expansion
- LandDefs (4 functions): coordinate system constants and transforms
- Collision/Transition (13 functions): sphere-polygon intersection,
  ray-plane tests, BSP traversal, walkable surface detection,
  slide/step sphere, main collision loop
- WeenieObject vtable (7 entries): confirmed from call site analysis

Also documents PhysicsObj struct layout (13 fields with offsets) and
MotionInterp struct layout (14 fields with offsets).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-12 23:46:22 +02:00

8 KiB

Raw Blame History

acclient.exe Decompiled Function Map

Mapped from 22,225 decompiled functions (688K lines of C) against ACE's C# physics port and ACME's ClientReference.cs.

CPhysicsObj (chunk_00510000.c, chunk_00500000.c)

Address	FUN name	ACE method	Description
0x515020	FUN_00515020	PhysicsObj::update_object	Top-level per-frame update
0x5111D0	FUN_005111d0	PhysicsObj::UpdatePhysicsInternal	Euler integration: `pos += veldt + 0.5accel*dt²`
0x511420	FUN_00511420	PhysicsObj::calc_acceleration	Sets gravity (-9.8 Z) when Gravity flag set
0x511EC0	FUN_00511ec0	PhysicsObj::set_velocity	Stores velocity, clamps to MaxVelocity (50.0)
0x511FA0	FUN_00511fa0	PhysicsObj::set_local_velocity	Body→world transform then set_velocity
0x511DE0	FUN_00511de0	PhysicsObj::set_on_walkable	Sets/clears OnWalkable transient flag
0x511560	FUN_00511560	PhysicsObj::report_collision_start	Fires environment collision callback
0x513AC0	FUN_00513ac0	PhysicsObj::report_collision_end	Fires collision-end callback
0x513B60	FUN_00513b60	PhysicsObj::handle_obj_collision	Object-to-object collision dispatch
0x515280	FUN_00515280	PhysicsObj::handle_collision	Elasticity bounce response
0x513730	FUN_00513730	PhysicsObj::UpdatePositionInternal	Position advance + interpenetration resolve
0x50F940	FUN_0050f940	PhysicsObj::calc_friction	Friction from ground normal + slope
0x510080	FUN_00510080	PhysicsObj::check_contact_velocity	Velocity vs contact normal check

PhysicsObj Struct Layout

Offset	Field	Type
+0xA8	State (PhysicsState flags)	uint
+0xAC	TransientState	uint
+0xB0	Elasticity	float
+0xD8	LastUpdateTime	double
+0xE0/E4/E8	Velocity XYZ	float[3]
+0xEC/F0/F4	Acceleration XYZ	float[3]
+0xF8/FC/100	Omega XYZ	float[3]
+0x12C	WeenieObject ptr	ptr
+0x130/134/138	Ground normal XYZ	float[3]

CMotionInterp (chunk_00520000.c)

Address	FUN name	ACE method	Description
0x5286B0	FUN_005286b0	MotionInterp::get_jump_v_z	Jump Z velocity (delegates to WeenieObj)
0x528660	FUN_00528660	MotionInterp::jump_charge_is_allowed	Can charge jump?
0x5285E0	FUN_005285e0	MotionInterp::motion_allows_jump	Current anim permits jump?
0x528EC0	FUN_00528ec0	MotionInterp::jump_is_allowed	Top-level jump permission
0x528CD0	FUN_00528cd0	MotionInterp::get_leave_ground_velocity	Full 3D launch vector
0x529390	FUN_00529390	MotionInterp::jump	Initiate jump
0x529710	FUN_00529710	MotionInterp::LeaveGround	Reset jump state on airborne
0x5296D0	FUN_005296d0	MotionInterp::HitGround	Landing handler
0x528960	FUN_00528960	MotionInterp::get_state_velocity	Compute velocity for current motion
0x528A50	FUN_00528a50	MotionInterp::StopCompletely	Reset to Ready/idle
0x5287F0	FUN_005287f0	MotionInterp::adjust_motion	Apply pending motion adjustments
0x5293F0	FUN_005293f0	MotionInterp::apply_raw_movement	Raw→interpreted state conversion
0x529210	FUN_00529210	MotionInterp::apply_current_movement	Set physics velocity from interpreted state
0x528DD0	FUN_00528dd0	MotionInterp::contact_allows_move	Slope angle check
0x528F70	FUN_00528f70	MotionInterp::DoInterpretedMotion	Core animation state machine
0x529080	FUN_00529080	MotionInterp::StopInterpretedMotion	Stop specific interpreted motion
0x529140	FUN_00529140	MotionInterp::StopMotion	Stop specific raw motion
0x529930	FUN_00529930	MotionInterp::DoMotion	Process one raw motion command
0x529A90	FUN_00529a90	MotionInterp::PerformMovement	Top-level dispatcher (switch 1-5)

MotionInterp Struct Layout

Offset	Field	ACE name
+0x04	WeenieObject ptr	WeenieObj
+0x08	PhysicsObject ptr	PhysicsObj
+0x14	RawMotionState start	RawState
+0x20	ForwardCommand	RawState.ForwardCommand
+0x28	ForwardSpeed	RawState.ForwardSpeed
+0x2C	SideStepCommand	RawState.SideStepCommand
+0x38	TurnCommand	RawState.TurnCommand
+0x44	InterpretedMotionState start	InterpretedState
+0x4C	InterpretedState.ForwardCommand
+0x50	InterpretedState.ForwardSpeed
+0x70	StandingLongJump	bool
+0x74	JumpExtent	float
+0x7C	MyRunRate	float

CLandBlockStruct (chunk_00530000.c)

Address	FUN name	ACE method	Description
0x531D10	FUN_00531d10	IsSWtoNECut	Split direction helper (inner)
0x532A50	FUN_00532a50	ConstructPolygons	Outer 8×8 loop with 0xCCAC033 constants
0x532EB0	FUN_00532eb0	GetCellRotation / ConstructUVs	PalCode computation
0x532D10	FUN_00532d10	unpack	Deserialize from dat stream
0x531F10	FUN_00531f10	get_packed_size	Returns 0xF4 (244 bytes)
0x532440	FUN_00532440	AdjustPlanes	Normal accumulation + lighting
0x532290	FUN_00532290	CalcCellWater	Water depth check

CLandBlock (chunk_00530000.c)

Address	FUN name	ACE method	Description
0x530690	FUN_00530690	Init / constructor	Initialize landblock fields
0x5307E0	FUN_005307e0	release_all	Free all resources
0x531780	FUN_00531780	init_static_objs	Load static objects from LandBlockInfo
0x531000	FUN_00531000	release_visible_cells	Free cell data
0x5301E0	FUN_005301e0	grab_visible_cells	BFS neighbor expansion
0x530650	FUN_00530650	add_server_object	Add entity to landblock

LandDefs (chunk_005A0000.c)

Address	FUN name	ACE method	Description
0x5AAA30	FUN_005aaa30	get_vars	Set 8 coordinate constants
0x5AABB0	FUN_005aabb0	get_outside_lcoord	Cell ID → world coord
0x5AAC70	FUN_005aac70	AdjustToOutside	Normalize position to outdoor coords
0x5AAB50	FUN_005aab50	get_block_dir	Quadrant → Direction enum

Collision / Transition (chunk_00530000.c)

Address	FUN name	ACE method	Description
0x5384E0	FUN_005384e0	Sphere::SphereIntersectsRay	Ray-sphere intersection
0x539500	FUN_00539500	Polygon::sphere_intersects_poly	Sphere-polygon contact
0x539750	FUN_00539750	Polygon::sphere_intersects_solid	Both-side penetration
0x539BA0	FUN_00539ba0	Polygon::find_time_of_collision	Ray-plane-polygon t
0x539DF0	FUN_00539df0	Polygon::find_time_of_collision	Cylinder variant
0x53A040	FUN_0053a040	Polygon::find_walkable_collision	Edge normal return
0x539110	FUN_00539110	Polygon::calc_normal	Face normal from vertices
0x539060	FUN_00539060	Plane::ray_plane_intersect	Basic ray-plane t
0x538EB0	FUN_00538eb0	Sphere::slide_sphere	Slide along surface
0x538F50	FUN_00538f50	Sphere::land_on_sphere	Step down to surface
0x538180	FUN_00538180	CTransition::collide_with_point	Point collision handler
0x5387C0	FUN_005387c0	CTransition::find_collisions	Main collision loop
0x53A230	FUN_0053a230	Polygon::hits_walkable	Walkable surface check

WeenieObject vtable (confirmed from call sites)

vtable offset	ACE method	Called from
+0x30	InqJumpVelocity	get_jump_v_z
+0x34	InqRunRate	get_state_velocity
+0x3C	CanJump	jump_is_allowed
+0x4C	HandleCollisionEnd	report_collision_end
+0x50	HandleCollisionStart	handle_obj_collision
+0x54	HandleMissileCollision	handle_obj_collision
+0x58	HandleEnvironmentCollision	report_collision_start

PhysicsEngine (chunk_00450000.c)

Address	FUN name	ACE method	Description
0x452A10	FUN_00452a10	PhysicsEngine::update	Main simulation loop

8 KiB Raw Blame History Unescape Escape

acclient.exe Decompiled Function Map

CPhysicsObj (chunk_00510000.c, chunk_00500000.c)

PhysicsObj Struct Layout

CMotionInterp (chunk_00520000.c)

MotionInterp Struct Layout

CLandBlockStruct (chunk_00530000.c)

CLandBlock (chunk_00530000.c)

LandDefs (chunk_005A0000.c)

Collision / Transition (chunk_00530000.c)

WeenieObject vtable (confirmed from call sites)

PhysicsEngine (chunk_00450000.c)

8 KiB

Raw Blame History