Retail's CPolygon::pos_hits_sphere at
acclient_2013_pseudo_c.txt:322974-322993 records the polygon pointer
(*arg5 = this at line 00539509) on STATIC overlap BEFORE the front-
face cull (dot(N, movement) >= 0 return 0 at line 0053952f). So when
a sphere statically overlaps a wall but is moving parallel/away from
the wall normal, retail returns 0 (no full hit) but the polygon
pointer IS set so Path 5's set_neg_poly_hit dispatch at
acclient_2013_pseudo_c.txt:0053a6ea fires and the outer
transitional_insert loop slides the sphere along the wall.
Pre-fix our PosHitsSphere set hitPoly only when both the static-
overlap AND the front-face cull passed. Near-miss polygons were
dropped → Path 5's `if (hitPoly0 is not null)` branch never fired →
NegPolyHit stayed false → outer loop never slid → inside-out cottage
doors let spheres squeeze through walls they were touching.
The handoff (docs/research/2026-05-25-door-bug-cdb-retail-trace-findings.md)
hypothesized swept-sphere intersection + closest-considered-polygon
tracking. Reading the actual retail decomp of pos_hits_sphere AND
polygon_hits_sphere_slow_but_sure (acclient_2013_pseudo_c.txt:322504-
322635) showed both functions are STATIC tests; the motion vector is
used only for the front-face cull. The fix is a one-line reordering.
Adds 3 unit tests in BSPQueryTests covering:
- Sphere overlaps wall + moves parallel → NegPolyHit fires (RED→GREEN)
- Sphere overlaps wall + moves away → NegPolyHit fires (RED→GREEN)
- Sphere overlaps wall + moves into → Slid (regression guard, already
passed)
Verification:
* 3 new Path 5 tests pass.
* Full Core suite: 14 failures with-fix vs 17 failures baseline-no-fix.
The with-fix failure set is a STRICT SUBSET of baseline — zero
regressions. The 14 remaining failures are pre-existing static-leak
flakiness between test classes (documented in CLAUDE.md) and 2 stale-
capture LiveCompare_* document-the-bug tests.
* All handoff "must-stay-green" tests pass:
- Directional_OutsideIn_SouthApproach_BlocksAtSlabSouthFace
- Directional_InsideOut_NorthApproach_BlocksAtSlabNorthFace
- CornerSlide_AlcoveEastToCottageNorth_ShouldBlock
- Geometric_DoorSlabAtSphereHeight_OverlapsInZ
- CellarUpTrajectoryReplayTests.LiveCompare_FirstCap_FixClosesCottageFloorCap
(issue #98 CRITICAL — no regression).
Per CLAUDE.md: needs visual verification at Holtburg cottage door
inside-out off-center (~50 cm) scenario before the A6.P4 phase is
marked complete.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Regression test for indoor BSP world-origin fix (Bug B). Verifies that
BSPQuery.FindCollisions with path.StepDown=true and a non-zero
worldOrigin parameter writes a world-space ContactPlane to
CollisionInfo (not a cell-local-space one).
Passes before the call-site fix at TransitionTypes.cs:1442 because
BSPQuery itself is correct when called with the right args — it's the
caller that was passing the defaults. This test locks in the BSPQuery
contract so the relationship between worldOrigin/localToWorld input and
ContactPlane.D output cannot regress silently.
Spec: docs/superpowers/specs/2026-05-20-indoor-bsp-worldorigin-fix-design.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Code review feedback on Task 2 commit 7f55e14:
- Tests 1 and 2 now assert on adjustedCenter.Z (was the wrapper's
primary behavioral contract — sphere placed on polygon plane —
but it was unverified). Math derived from AdjustSphereToPlane:
iDist = (dpPos - radius) / dpMove; new center = center - movement * iDist.
- Test 2 also gains the hitPoly.Plane.Normal.Z assertion that
Test 1 already had.
- Test 4 comment slope-angle clarification.
- BSPQuery.cs FindWalkableSphere section header now notes this is
not a direct retail port (it wraps BSPNODE::find_walkable +
BSPLEAF::find_walkable via the existing FindWalkableInternal).
No behavior change. Build clean; 4/4 tests pass; same 8 pre-existing
failures.
Spec: docs/superpowers/specs/2026-05-19-indoor-walkable-plane-bsp-port-design.md
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Thin public wrapper over the existing retail-faithful
FindWalkableInternal (BSPNODE::find_walkable + BSPLEAF::find_walkable
port). Probes downward by probeDistance along up, returns the closest
walkable polygon the sphere would rest on plus the adjusted center.
Will replace Transition.TryFindIndoorWalkablePlane's linear first-match
scan (next commit). The wrapper is callable from any "stand here, find
my floor" use case; current intent is indoor walkable-plane synthesis.
4 unit tests covering: two-floors-foot-between (sphere overlapping lower
floor), only-upper-floor-foot-above (sphere overlapping upper floor),
no-walkable-in-probe-range (sphere out of overlap distance for all
polygons), steep-poly-rejected-by-WalkableAllowance. Note: find_walkable
requires sphere to overlap the polygon plane (|dist| <= radius);
the tests use geometry that exercises this correctly, unlike the spec's
illustrative values which assumed a "nearest below" scan.
Spec: docs/superpowers/specs/2026-05-19-indoor-walkable-plane-bsp-port-design.md
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Load PhysicsBSP and PhysicsPolygons from GfxObj dats during streaming.
BSPQuery.SphereIntersectsPoly traverses the tree for collision detection.
Ported from decompiled FUN_00539270, cross-ref ACE BSPNode.sphere_intersects_poly.
- PhysicsDataCache: thread-safe ConcurrentDictionary-backed cache of GfxObjPhysics
(BSP tree + polygon dict + vertex array) and SetupPhysics (capsule dimensions).
CacheGfxObj/CacheSetup are idempotent — safe to call at every dat load site.
- BSPQuery.SphereIntersectsPoly: recursive BSP descent with bounding-sphere broad
phase, leaf polygon test via existing CollisionPrimitives.SphereIntersectsPoly
(FUN_00539500), and splitting-plane classification for internal nodes.
- GameWindow: _physicsDataCache populated at all GfxObj/Setup dat load sites
(streaming worker path, live-spawn path, ApplyLoadedTerrain render-thread path).
- 6 new unit tests covering null node, bounding-sphere miss, leaf hit, no-contact,
internal node recursion, and empty cache behaviour. All 447 tests green.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
