Added diagnostic apparatus that pinpoints the inside-out walkthrough
as a collision-geometry GAP, not a collision-detection bug.
New tests in DoorBugTrajectoryReplayTests:
- InsideOut_Tick3254_WithCottageWalls_ShouldBlock: hypothesis test that
registered cottage GfxObj 0x01000A2B and replayed the captured tick.
Cottage blocked sphere but with cn=(0,0,1) floor-cap normal, not a
wall normal — first signal that cottage geometry near the sphere
isn't a wall.
- Diagnostic_CottagePolys_NearWalkthroughPosition: dumps cottage polys
near sphere XY=(133.655, 17.59) at any Z. Result: ZERO cottage
polygons in that area. The cottage GfxObj has no geometry where the
sphere walks through.
DoorSetupGfxObjInspectionTests.HoltburgCottage_CellPortals_DatInspection
extended to dump cell 0xA9B40150's 4 physics polygons in world frame:
- floor (Z=94), ceiling (Z=96.5), west wall (X=131.6), east wall (X=133.5)
- All walls only span Y=[16.5, 17.1] — the small doorway alcove volume
- North of Y=17.1, no wall
Captured sphere at (133.655, 17.59) is 0.155 m east of cell east wall
AND 0.49 m north of the wall's Y range. No collision geometry exists
at that XY past Y=17.1. The collision representation has a gap that
the visual cottage covers with a wall.
Production capture confirms the diagnosis: cottage GfxObj fires
[bsp-test] 425 times during inside-out walking — visibility IS
correct post-AddAllOutsideCells fix. Door slab fires 245 times. But
the BSP queries find no polygon at (133.655, 17.6+, 94-95.20). The
slab's east face blocks WEST motion (cn=(+1,0,0) as captured), sphere
free to move +Y past it because no wall is there to block.
Three candidates for next-session investigation:
1. Different cottage GfxObj (Holtburg cottages may be multi-piece)
2. Landblock-baked stab static at the cottage exterior wall location
3. Cottage GfxObj's visual polygons wider than physics polygons (dat fact)
Cheapest next step: add LandblockStatics_DatInspection test that
loads LandBlockInfo 0xA9B4FFFE + iterates StaticObjects + prints
every entity at world XY in [131,135] x [16,19]. Reveals what other
entities live at the cottage doorway.
Full handoff: docs/research/2026-05-25-door-bug-inside-out-geometry-gap.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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