Live cdb trace of retail acclient.exe (v11.4186, PDB-matched) capturing
the exact function call sequence for a direct walk-to-run motion
transition where the user holds shift+W (walk) then releases SHIFT
while still holding W (transition to run).
Trace bps on:
- CPhysicsObj::DoInterpretedMotion (0x0050EA70)
- CPartArray::DoInterpretedMotion (0x00518750)
- MotionTableManager::PerformMovement (0x0051C0B0)
- MotionTableManager::add_to_queue (0x0051BFE0)
- MotionTableManager::truncate_animation_list (0x0051BCA0)
- CMotionTable::DoObjectMotion (0x00523E90)
- CMotionTable::StopObjectMotion (0x00523EC0)
Captured trace at tools/cdb-scripts/walk_run_motion_trace.log shows
the precise walk-to-run sequence:
[79] CPhysicsObj::DoInterpretedMotion: motion=45000005 walk start
[82] CMotionTable::DoObjectMotion: motion=45000005
[83] MotionTableManager::add_to_queue: arg1=45000005 arg2=00000001
[89] CPhysicsObj::DoInterpretedMotion: motion=44000007 run start
[92] CMotionTable::DoObjectMotion: motion=44000007
[93] MotionTableManager::add_to_queue: arg1=44000007 arg2=00000001
[104] CMotionTable::StopObjectMotion: motion=44000007 run end
Critical structural finding for #L.4-walk-run:
Retail does NOT call truncate_animation_list during the walk→run
transition. truncate_animation_list never fires in the entire 200-hit
trace. Retail also does NOT call StopObjectMotion(WalkForward) before
add_to_queue(RunForward). Retail just appends the new motion to the
queue and lets MotionTableManager (and its CheckForCompletedMotions /
remove_redundant_links per-tick cleanup, not yet traced) handle the
natural progression.
acdream's AnimationSequencer.SetCycle aggressively calls
ClearCyclicTail() at line 430 BEFORE enqueuing the new cycle, which
destroys the in-flight walk cycle's frames. The new run cycle is
enqueued but _currNode is left in a state that doesn't smoothly
continue — visible to the user as "it just blips forward walking,
AS SOON as press another key like turning, its starts running"
(the next motion event re-fires SetCycle which finally aligns state).
Fix is a structural refactor of SetCycle to mirror retail's
"additive queue with auto-cleanup" semantics. Out of scope for this
research commit; filed as #L.4 in the next ISSUES.md entry.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
