Rewrites src/AcDream.Core/Physics/InterpolationManager.cs from the spec
in docs/research/2026-05-04-l3-port/04-interp-manager.md. Public API
preserved (Vector3-returning AdjustOffset, Enqueue, Clear, IsActive,
Count) so PositionManager + GameWindow callers continue to compile;
internals are full retail spec.
Bug fixes vs prior port (audit 04-interp-manager.md § 7):
#1 progress_quantum accumulates dt (sum of frame deltas), not step
magnitude. Retail line 353140; the prior port's `+= step` made
the secondary stall ratio meaningless.
#3 Far-branch Enqueue (dist > AutonomyBlipDistance = 100m) sets
_failCount = StallFailCountThreshold + 1 = 4, so the next
AdjustOffset call's post-stall check fires an immediate blip-to-
tail snap. Retail line 352944. Prior port silently drifted
toward far targets at catch-up speed instead of teleporting.
#4 Secondary stall test ports the retail formula verbatim:
cumulative / progress_quantum / dt < CREATURE_FAILED_INTERPOLATION_PERCENTAGE.
Audit notes the units are 1/sec (likely Turbine bug or x87 FPU
misread by Binary Ninja) — mirrored byte-for-byte regardless.
#5 Tail-prune is a tail-walking loop, not a single-tail compare.
Multiple consecutive stale tail entries within DesiredDistance
(0.05 m) of the new target collapse together. Retail line 352977.
#6 Cap-eviction at the HEAD when count reaches 20 (already correct
in the prior port; verified).
New API: Enqueue gains an optional `currentBodyPosition` parameter so
the far-branch detection can reference the body when the queue is
empty. Backward-compatible (default null = pre-far-branch behavior).
UseTime collapsed into AdjustOffset's tail (post-stall blip check)
since acdream has no per-tick UseTime call separate from
adjust_offset; identical semantic outcome.
State fields renamed to retail names with sentinel values:
_frameCounter, _progressQuantum, _originalDistance (init = 999999f
sentinel per retail line 0x00555D30 ctor), _failCount.
Tests:
- 17/17 InterpolationManagerTests green.
- New test Enqueue_FarBranch_PrearmsImmediateBlipOnNextAdjustOffset
pins the bug #3 fix: enqueueing 150 m away triggers a same-tick
blip (delta length ≈ 150 m), and the queue clears.
Spec tree: 17 research docs (00–14) under docs/research/2026-05-04-l3-port/.
00-master-plan + 00-port-plan describe the 8-phase rollout. 01-per-tick,
03-up-routing, 04-interp-manager, 05-position-manager-and-partarray,
06-acdream-audit, 14-local-player-audit are the L.3 spec used by this
commit and the M2 follow-up.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
