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fix(#171): gate NPC UP hard-snaps while stuck — the sticky/snap tug-of-war (gate-1 residuals)

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Gate 1 (2026-07-04): "better in general" + three residuals — monsters
pushed INTO the player, attacks with stale facing, position
"flashing/flapping instead of gliding". All three are ONE mechanism:
the legacy NPC UpdatePosition handler hard-snaps position, orientation,
and velocity/cycle UNCONDITIONALLY, fighting the armed sticky every UP
(ACE's authoritative rest pose sits ~0.6 m out and its server-side
facing lags the strafing target; the client stick holds 0.3 m + live
facing — oscillation at UP cadence).

Retail is immune by architecture, not by tuning: UP corrections flow
through the InterpolationManager into the SAME per-tick
PositionManager::adjust_offset chain where StickyManager::adjust_offset
OVERWRITES them while armed (0x00555190 chain order; 0x00555430 assigns
m_fOrigin). A server correction can never fight an armed stick
frame-by-frame. The remote-player branch already has exactly that
(queue -> combiner -> sticky overwrite); the legacy NPC path snaps
outside the chain.

Fix: suppress the NPC UP position/orientation/velocity-adoption snaps
while the entity is stuck (PositionManager.GetStickyObjectId() != 0) —
the retail chain semantics translated to the snap architecture.
LastServerPos/Time + cell bookkeeping still record; server truth
reasserts on the first UP after unstick, bounded by the 1 s sticky
lease. Register row TS-44 (same commit); retires with the S6/R6
interp-queue unification of the NPC path.

Apparatus: ACDREAM_PROBE_STICKY=1 — per-guid [sticky] lifecycle lines
(STICK / UNSTICK / LEASE-EXPIRE / TARGET-status teardown), per-armed-
tick steer lines (signed gap dist, applied delta, heading delta, live
resolve), and [sticky-snap-skip] at the suppressed-snap site.
PhysicsDiagnostics.ProbeStickyEnabled owns the flag (rule #5).

Full suite 4038 green. Awaiting gate 2 (pack melee vs retail).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-07-05 09:34:25 +02:00
parent 5bd2b8bc8b
commit 7a82317614
5 changed files with 90 additions and 4 deletions
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15
src/AcDream.Core/Physics/PhysicsDiagnostics.cs
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@ -80,6 +80,20 @@ public static class PhysicsDiagnostics
public static bool ProbeCellSetEnabled { get; set; }
= Environment.GetEnvironmentVariable("ACDREAM_PROBE_CELLSET") == "1";
/// <summary>
/// R5-V3 #171 residuals (2026-07-04) — sticky-melee timeline probe.
/// One <c>[sticky]</c> line per StickyManager lifecycle event (STICK /
/// UNSTICK / LEASE-EXPIRE / TARGET-status teardown) and per armed
/// <c>AdjustOffset</c> tick (guid, signed gap distance, applied delta,
/// heading delta), plus <c>[sticky-snap-skip]</c> lines at the NPC
/// UpdatePosition handler when a server hard-snap is suppressed because
/// the entity is stuck. Heavy while a pack is stuck (~60 Hz × stuck
/// count); capture-session only. All lines carry the guid
/// (feedback_probe_identity_attribution).
/// </summary>
public static bool ProbeStickyEnabled { get; set; }
= Environment.GetEnvironmentVariable("ACDREAM_PROBE_STICKY") == "1";
public static void LogCellSetBuild(
uint seedCellId,
System.Numerics.Vector3 sphereCenter,
@ -562,6 +576,7 @@ public static class PhysicsDiagnostics
ProbeCellEnabled = false;
ProbeBuildingEnabled = false;
ProbeCellSetEnabled = false;
ProbeStickyEnabled = false;
ProbeAutoWalkEnabled = false;
ProbeUseabilityFallbackEnabled= false;
DumpSteepRoofEnabled = false;