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test(physics): conformance fixtures for BSP step-up + roof-landing (Phase L.2.0)

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Adds two files under tests/:
  BSPStepUpFixtures.cs — synthetic PhysicsBSPNode trees for four canonical
    collision shapes: low step (25 cm), too-tall wall (5 m), flat roof (3 m),
    and steep slope (60deg).  Pre-builds ResolvedPolygon dicts with correct
    polygon_hits_sphere_precise winding (CCW relative to outward normal).
  BSPStepUpTests.cs — 11 conformance tests:
    A1-A6: baselines that pass before and after implementation (no-hit, geometry
           fixture sanity checks).
    B1-B3: Phase L.2.1 targets, currently RED (Path 5 wall-slides).
    C1-C3: Phase L.2.2 targets, currently RED (Path 6 wall-slides).

Retail refs in test docstrings:
  BSPTREE::find_collisions Path 5 acclient_2013_pseudo_c.txt:323849 /
    ACE BSPTree.cs:192-196.
  CTransition::step_up acclient_2013_pseudo_c.txt:273099-273133 /
    ACE Transition.cs:746-777.
  SPHEREPATH::set_collide acclient_2013_pseudo_c.txt:321594-321607 /
    ACE SpherePath.cs:279-286.
  CTransition::transitional_insert Collide branch
    acclient_2013_pseudo_c.txt:273193-273239 / ACE Transition.cs:891-930.

Also adds PhysicsDataCache.RegisterGfxObjForTest() for test-only GfxObjPhysics
injection without real DAT content.

Test delta: 811 -> 823 (+12). 6 passing (A1-A6 + B2), 5 intentionally failing.

Pre-flight: object-translation plane D is in object-local space. Bug is dormant
for outdoor movement where terrain sets the world-space ContactPlane. Tagged TODO.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-29 15:44:16 +02:00
parent 7d6fe90607
commit b0c29454d0
3 changed files with 846 additions and 0 deletions
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8
src/AcDream.Core/Physics/PhysicsDataCache.cs
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@ -209,6 +209,14 @@ public sealed class PhysicsDataCache
public int GfxObjCount => _gfxObj.Count;
public int SetupCount => _setup.Count;
public int CellStructCount => _cellStruct.Count;
/// <summary>
/// Register a pre-built <see cref="GfxObjPhysics"/> directly.
/// Intended for unit-test fixtures that construct synthetic BSP trees
/// without needing real DAT content.
/// </summary>
public void RegisterGfxObjForTest(uint gfxObjId, GfxObjPhysics physics)
=> _gfxObj[gfxObjId] = physics;
}
/// <summary>