fix #137 (mechanism 2): BSP full-hit stubs leaked sliding normals — the corridor absorbing wedge
The Facility Hub corridor dead-stop's second half: after one seam hit, every forward resolve returned ok=False hit=no with zero advance. The body-persisted SlidingNormal (-1,0,0) projected the exactly-anti-parallel corridor push to zero in AdjustOffset and the step loop aborted at step 0 before any collision test could refresh the state. Audit (docs/research/2026-07-06-137-sliding-normal-lifecycle-audit.md): retail's only in-transition sliding-normal writer is validate_transition (0x0050ac21); the whole sphere/BSP layer writes NONE (grep-verified), and the body persistence (SetPositionInternal 0x005154c2, SLIDING_TS bit sync 0x005154e1) runs only on transition success. Our BSPQuery Contact-branch full-hit responses were stubs (SetCollisionNormal + SetSlidingNormal + return Slid) where retail dispatches the real slide_sphere — so the seam hit (a SUCCESSFUL full-advance resolve per the live log) persisted the phantom wall's normal, which retail's lifecycle structurally cannot do. - BSPQuery Contact foot full-hit fallback + head full-hit now route through Transition.SlideSphereInternal (CSphere::slide_sphere 0x00537440 — in-frame slide, no sliding-normal write; ACE BSPTree.cs:202,310-316). The dead stub is rewritten as the faithful BSPTREE::slide_sphere wrapper. - PhysicsEngine sliding writeback gated on ok (retail success-only placement; behaviorally latent, removes the failed-frame leak class). - Register: TS-4 amended (Path-6 steep-tangent sites still write the normal — now documented), TS-45 added (SphereCollision's write — same leak class, left for a follow-up out of #171's blast radius). - Pins: Issue137SlidingNormalLifecycleTests — both site pins RED->GREEN, plus the retail persist/absorb/clear wall lifecycle (validate-write persistence, faithful absorbed anti-parallel frame, oblique escape clears the bit). BSPQueryTests full-hit pin updated to the real slide. Mechanism 1 (PortalSide portal polys solid in the physics set) stays OPEN - #137 not closed; the corridor re-test rides that session. Suites: Core 2545 / App 713 / UI 425 / Net 385, 0 failures. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Erik
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using System;
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using System.Collections.Generic;
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using System.Numerics;
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using DatReaderWriter.Enums;
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using DatReaderWriter.Types;
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using AcDream.Core.Physics;
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using Xunit;
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using Plane = System.Numerics.Plane;
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namespace AcDream.Core.Tests.Physics;
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/// <summary>
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/// #137 mechanism 2 — the sliding-normal absorbing wedge (2026-07-06).
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///
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/// <para>
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/// Retail's in-transition <c>collision_info.sliding_normal</c> has exactly ONE
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/// writer besides the per-frame seed: <c>CTransition::validate_transition</c>
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/// (0x0050ac21-ac30, "if collision_normal_valid → set_sliding_normal"). The
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/// BSP collision layer NEVER writes it — <c>BSPTREE::find_collisions</c>'
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/// Contact branch dispatches full hits to <c>step_sphere_up</c> (foot,
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/// 0x0053a719) / <c>BSPTREE::slide_sphere</c> (head, 0x0053a697), and
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/// <c>CSphere::slide_sphere</c> (0x00537440) slides IN-FRAME via
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/// <c>add_offset_to_check_pos</c> without touching sliding_normal
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/// (grep-verified: zero sliding_normal references between 0x005155 and
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/// 0x00841f in acclient_2013_pseudo_c.txt). ACE mirrors this: the only
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/// SetSlidingNormal call sites are CollisionInfo.cs:58 (the setter) and
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/// Transition.cs:1027 (validate). The body-side persistence
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/// (<c>CPhysicsObj::SetPositionInternal</c> 0x005154c2, SLIDING_TS bit-4 sync
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/// at 0x005154e1) runs only on transition SUCCESS.
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/// </para>
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///
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/// <para>
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/// acdream's BSPQuery Contact branch carried stub fallbacks
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/// (SetCollisionNormal + SetSlidingNormal + return Slid) instead of the real
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/// slide. The leaked sliding normal survived to the transition end, the
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/// unconditional body writeback persisted it, and the next frame's seed
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/// projected an exactly-anti-parallel push to zero — aborting at step 0
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/// BEFORE any collision test could refresh the state. Live shape: the
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/// Facility Hub corridor phantom (launch-175-verify2.log:42858 — one wall
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/// hit at the 0x8A02016E→0x8A02017A seam, then endless ok=False hit=no
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/// zero-advance resolves; strafe escapes).
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/// </para>
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/// </summary>
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public class Issue137SlidingNormalLifecycleTests
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{
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// =========================================================================
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// Site-level pins — BSPQuery.FindCollisions Contact branch must not write
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// the transition's sliding normal (retail: only validate_transition does).
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// =========================================================================
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/// <summary>
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/// Contact foot-sphere FULL HIT with the step-up recursion unavailable
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/// (engine=null / step-up already in progress) must dispatch the real
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/// sphere slide — never the SetSlidingNormal stub.
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///
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/// <para>
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/// Retail: a blocked step-up funnels to <c>SPHEREPATH::step_up_slide</c> →
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/// <c>CSphere::slide_sphere</c> (ACE SpherePath.cs:316 → Sphere.cs:558) —
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/// in-frame slide, no sliding_normal write. Face-on into a vertical wall
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/// while grounded: the crease projection (cross(wallN, floorN)) has no
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/// component along the movement, the slide offset is degenerate
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/// (< F_EPSILON), and slide_sphere returns COLLIDED_TS (0x00537735).
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/// </para>
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/// </summary>
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[Fact]
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public void ContactFootFullHit_StepUpUnavailable_RealSlide_NoSlidingNormalWrite()
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{
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var (root, resolved) = BSPStepUpFixtures.TallWall();
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// Grounded mover pushing face-on (+X) into the 5 m wall at x=0.5
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// (normal −X). Sphere center reach 0.35+0.2=0.55 penetrates the wall.
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var from = new Vector3(0.10f, 0f, BSPStepUpFixtures.SphereRadius);
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var to = new Vector3(0.35f, 0f, BSPStepUpFixtures.SphereRadius);
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var t = BSPStepUpFixtures.MakeGroundedTransition(from, to);
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var localSphere = new DatReaderWriter.Types.Sphere
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{
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Origin = to,
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Radius = BSPStepUpFixtures.SphereRadius,
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};
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var result = BSPQuery.FindCollisions(
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root, resolved, t, localSphere, null,
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from, Vector3.UnitZ, 1.0f);
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Assert.False(t.CollisionInfo.SlidingNormalValid,
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"find_collisions must not write collision_info.sliding_normal — " +
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"retail's only in-transition writer is validate_transition " +
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"(0x0050ac21). A sliding normal leaked here survives to the body " +
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"writeback and absorbs the next frame's forward offset (#137).");
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Assert.True(t.CollisionInfo.CollisionNormalValid,
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"The real slide records the collision normal (CSphere::slide_sphere " +
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"→ set_collision_normal).");
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Assert.Equal(TransitionState.Collided, result);
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}
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/// <summary>
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/// Contact HEAD-sphere FULL HIT must dispatch <c>BSPTREE::slide_sphere</c>
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/// (retail 0x0053a697; ACE BSPTree.cs:202 → 310-316: the real
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/// <c>Sphere.SlideSphere</c> on GlobalSphere[0]) — never the stub.
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/// The corridor phantom's portal-side polys span head height; this is the
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/// path that recorded the (−1,0,0) normal the wedge absorbed on.
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/// </summary>
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[Fact]
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public void ContactHeadFullHit_RealSlide_NoSlidingNormalWrite()
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{
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// Raised wall: z ∈ [0.6, 5] at x=0.5, normal −X. The foot sphere
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// (center z=0.2, r=0.2 → z-span [0, 0.4]) passes under it; the head
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// sphere (center z=0.8 → z-span [0.6, 1.0]) fully hits it.
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var resolved = new Dictionary<ushort, ResolvedPolygon>();
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var floorVerts = new[]
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{
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new Vector3(-2f, -1f, 0f), new Vector3(2f, -1f, 0f),
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new Vector3(2f, 1f, 0f), new Vector3(-2f, 1f, 0f),
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};
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resolved[1] = new ResolvedPolygon
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{
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Vertices = floorVerts,
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Plane = new Plane(Vector3.UnitZ, 0f),
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NumPoints = 4,
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SidesType = CullMode.None,
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};
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var wallNormal = new Vector3(-1f, 0f, 0f);
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var wallVerts = new[]
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{
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new Vector3(0.5f, -1f, 0.6f),
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new Vector3(0.5f, -1f, 5f),
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new Vector3(0.5f, 1f, 5f),
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new Vector3(0.5f, 1f, 0.6f),
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};
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resolved[2] = new ResolvedPolygon
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{
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Vertices = wallVerts,
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Plane = new Plane(wallNormal, 0.5f), // n·p + d = 0 at x=0.5
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NumPoints = 4,
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SidesType = CullMode.None,
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};
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var leaf = new PhysicsBSPNode
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{
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Type = BSPNodeType.Leaf,
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BoundingSphere = new DatReaderWriter.Types.Sphere { Origin = new Vector3(0f, 0f, 2.5f), Radius = 10f },
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};
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leaf.Polygons.Add(1);
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leaf.Polygons.Add(2);
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var from = new Vector3(0.10f, 0f, BSPStepUpFixtures.SphereRadius);
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var to = new Vector3(0.35f, 0f, BSPStepUpFixtures.SphereRadius);
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var t = BSPStepUpFixtures.MakeGroundedTransition(from, to);
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var footSphere = new DatReaderWriter.Types.Sphere
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{
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Origin = to,
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Radius = BSPStepUpFixtures.SphereRadius,
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};
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var headSphere = new DatReaderWriter.Types.Sphere
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{
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Origin = new Vector3(to.X, to.Y, 0.8f),
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Radius = BSPStepUpFixtures.SphereRadius,
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};
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var result = BSPQuery.FindCollisions(
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leaf, resolved, t, footSphere, headSphere,
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from, Vector3.UnitZ, 1.0f);
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Assert.False(t.CollisionInfo.SlidingNormalValid,
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"Head full hit must go through the real BSPTREE::slide_sphere — " +
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"no sliding_normal write at the BSP layer (retail 0x0053a697).");
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Assert.True(t.CollisionInfo.CollisionNormalValid);
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Assert.Equal(TransitionState.Collided, result);
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}
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// =========================================================================
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// Engine-level lifecycle pin — the retail persist/absorb/clear cycle at a
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// REAL wall. Guards the fix against regressing wall behavior, and
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// documents where retail CLEARS the body's sliding state (the successful
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// transition's writeback, when no step re-records a collision).
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// =========================================================================
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private const uint CellId = 0xA9B40157u;
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private static PhysicsEngine BuildWallEngine()
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{
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var (wallRoot, wallResolved) = BSPStepUpFixtures.TallWall();
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var cell = new CellPhysics
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{
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BSP = new PhysicsBSPTree { Root = wallRoot },
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WorldTransform = Matrix4x4.Identity,
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InverseWorldTransform = Matrix4x4.Identity,
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Resolved = wallResolved,
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CellBSP = new CellBSPTree
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{
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Root = new CellBSPNode { Type = BSPNodeType.Leaf },
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},
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};
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var engine = new PhysicsEngine();
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engine.DataCache = new PhysicsDataCache();
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// Flat terrain strip so the outdoor fall-through has something to
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// sample if it ever fires (same shape as FindEnvCollisionsMultiCellTests).
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var heights = new byte[81];
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Array.Fill(heights, (byte)0);
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engine.AddLandblock(0xA9B4FFFFu, new TerrainSurface(heights, BuildHeightTable()),
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Array.Empty<CellSurface>(), Array.Empty<PortalPlane>(),
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worldOffsetX: 0f, worldOffsetY: 0f);
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engine.DataCache.RegisterCellStructForTest(CellId, cell);
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return engine;
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}
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private static float[] BuildHeightTable()
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{
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var ht = new float[256];
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for (int i = 0; i < 256; i++) ht[i] = i * 1.0f;
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return ht;
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}
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private static PhysicsBody GroundedBody()
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{
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var body = new PhysicsBody();
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body.ContactPlaneValid = true;
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body.ContactPlane = new Plane(Vector3.UnitZ, 0f);
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body.TransientState |= TransientStateFlags.Contact | TransientStateFlags.OnWalkable;
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return body;
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}
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private ResolveResult ResolveForward(PhysicsEngine engine, PhysicsBody body,
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Vector3 from, Vector3 to)
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=> engine.ResolveWithTransition(
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currentPos: from,
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targetPos: to,
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cellId: CellId,
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sphereRadius: BSPStepUpFixtures.SphereRadius,
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sphereHeight: 0f, // single sphere — keeps the scenario deterministic
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stepUpHeight: 0.04f, // cannot scale the 5 m wall
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stepDownHeight: 0.04f,
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isOnGround: true,
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body: body);
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/// <summary>
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/// The full retail lifecycle at a real wall:
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/// (1) a blocked face-on push persists the validate-recorded sliding
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/// normal via the SUCCESS writeback (SetPositionInternal bit-4 sync,
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/// 0x005154e1);
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/// (2) the next exactly-anti-parallel push is absorbed by the seed
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/// (get_object_info 0x00511d44 → adjust_offset projects to zero →
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/// find_transitional_position's step-0 small-offset abort) — the
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/// retail cache semantics: "still pressed against this wall";
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/// (3) an oblique push escapes along the wall tangent, the step runs
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/// without re-recording a collision, and the successful writeback
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/// CLEARS the body's sliding state (sliding_normal_valid==0 → bit
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/// 4 cleared).
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/// </summary>
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[Fact]
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public void WallLifecycle_PersistOnBlock_AbsorbExactAntiParallel_ClearOnEscape()
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{
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var engine = BuildWallEngine();
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var body = GroundedBody();
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// ── 1. Face-on +X into the wall at x=0.5 (normal −X) ─────────────
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var r1 = ResolveForward(engine, body,
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from: new Vector3(0.10f, 0f, 0f),
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to: new Vector3(0.35f, 0f, 0f));
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Assert.True(body.TransientState.HasFlag(TransientStateFlags.Sliding),
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"A blocked push must persist the validate-recorded sliding normal " +
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"(retail SetPositionInternal 0x005154c2 on transition success).");
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Assert.True(body.SlidingNormal.X < -0.9f,
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$"Persisted normal should face the mover (−X); got {body.SlidingNormal}.");
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Assert.True(r1.Position.X + BSPStepUpFixtures.SphereRadius
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<= 0.5f + PhysicsGlobals.EPSILON * 20f,
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$"The 5 m wall must block the sphere; reach={r1.Position.X + BSPStepUpFixtures.SphereRadius:F4}.");
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// ── 2. Exactly-anti-parallel push again: absorbed frame ──────────
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var r2 = ResolveForward(engine, body,
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from: r1.Position,
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to: r1.Position + new Vector3(0.15f, 0f, 0f));
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Assert.False(r2.Ok,
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"The seeded sliding normal projects the exactly-anti-parallel " +
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"offset to zero → step-0 abort (retail find_transitional_position " +
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"0050bfb7/0050c0ef). Faithful absorbed frame at a REAL wall.");
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Assert.True(body.TransientState.HasFlag(TransientStateFlags.Sliding),
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"A failed transition leaves the body's sliding state untouched " +
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"(retail: SetPositionInternal never runs on failure).");
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// ── 3. Oblique push escapes and CLEARS the persisted state ───────
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var r3 = ResolveForward(engine, body,
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from: r2.Position,
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to: r2.Position + new Vector3(0.10f, 0.15f, 0f));
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Assert.True(r3.Ok, "Oblique push must escape along the wall tangent.");
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Assert.True(r3.Position.Y > r2.Position.Y + 0.05f,
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$"Expected tangential advance along +Y; got Y={r3.Position.Y:F4} " +
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$"(from {r2.Position.Y:F4}).");
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Assert.False(body.TransientState.HasFlag(TransientStateFlags.Sliding),
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"A successful transition whose steps re-record no collision must " +
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"CLEAR the body's sliding state (retail SetPositionInternal " +
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"0x005154e1: bit 4 synced from the transition's final " +
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"sliding_normal_valid, which each step clears before its insert).");
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Assert.Equal(Vector3.Zero, body.SlidingNormal);
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}
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}
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