Parse the complete PhysicsDesc plus F754/F755 packets, correct every PhysicsState bit, and gate all nine retail update channels with generation-safe immutable snapshots. Preserve ForcePosition, teleport, placement, velocity, parent, pickup, delete, and same-generation CreateObject ordering from the named client.
Separate accepted logical lifecycle notifications from retained UI qualities, make GUID replacement and session reset clear every projection exactly once, and add packet, wraparound, malformed-input, parent FIFO, canonical-position, reconnect, and GUID-reuse conformance coverage.
Co-Authored-By: Codex <noreply@openai.com>
The A6.P4 port, fused into one installment per the BR-2 half-port lesson
(registration and query are co-dependent: flood-registering shells under
the old radial query would re-open #98 through the vestibule).
REGISTRATION (ShadowObjectRegistry rewritten):
- Register/RegisterMultiPart/UpdatePosition compute the cell set via
CellTransit.BuildShadowCellSet (the C2 find_cell_list flood) seeded by
the entity's m_position cell id; the private 24m XY-grid rectangle and
its single-landblock clamp are deleted. Flood spheres follow retail's
CylSphere rule (base point + cyl radius, cap 10; BSP bounding-sphere
fallback - Ghidra 0x0052b9f0). Statics flood with the do_not_load
prune; dynamics (server spawns, isStatic:false) without.
- Keep-when-empty (SetPositionInternal num_cells gate, pc:283540): a
failed flood leaves the previous registration in place.
- RefloodLandblock: streaming-race hook re-runs the flood when a
landblock's cells hydrate (retail init_objects -> recalc_cross_cells,
Ghidra 0x0052b420/0x00515a30); wired at GameWindow's hydration tail.
- GameWindow sites pass the server position's full cell id as the seed
(spawn + UpdatePosition); the five static sites pass ParentCellId.
BUILDING CHANNEL (CSortCell.building shape):
- Building SHELLS are not shadow objects in retail (only caller of
find_building_collisions is CSortCell::find_collisions 0x005340aa;
one building per origin landcell, init_buildings 0x0052fd80 verified
verbatim + ACE cross-ref). IsBuildingShell entities skip the registry;
Transition.FindBuildingCollisions runs the shell part-0 BSP off
cache.GetBuilding(cellId) with bldg_check set around it
(find_building_collisions 0x006b5300), CollidedWithEnvironment on
non-Contact non-OK. BuildingPhysics.ModelId = pre-resolved part-0
GfxObj (0x02 Setups resolved at the CacheBuilding site).
- Placement/ethereal weakening: BSPQuery Path 1 passes center_solid=0
when BldgCheck && HitsInteriorCell (BSPTREE::find_collisions 0x0053a82e
+ placement_insert 0x005399d8) so doorway crossings don't hard-fail
against shell solids. SpherePath gains both retail fields;
HitsInteriorCell is rebuilt at every cell-array build
(build_cell_array reset 0x00509ef2 + find_cell_list/check_building_
transit set sites).
QUERY (retail per-cell order, transitional_insert 0x0050b6f0):
- TransitionalInsert per attempt: env -> building (LandCell only) ->
objects on the PRIMARY cell, then on OK the check_other_cells pass
(env -> building -> objects per OTHER overlapped cell) + the
carried-cell advance - the advance now happens AFTER all per-cell
object passes (the WF1 ordering divergence), with Adjusted/Slid
feeding the retry exactly like retail's OK_TS case.
- FindObjCollisionsInCell = CObjCell::find_obj_collisions (0x0052b750):
iterate ONLY the asked cell's list. DELETED: the radial 9-landblock
sweep, the +5m query pad, the b3ce505 indoor-primary gate, and the
isViewer exemption (the camera is bounded by interior cell-BSP env
collision - retail's own channel; CameraCornerSealReplayTests pins it
against real dat, and the new building-channel camera test pins the
outdoor stop).
TESTS: Core 1416/0/2 (was 1398 + 4 pre-existing #99-era fails + 1 skip),
App 225, UI 420, Net 294 - all green.
- 3 of the 4 #99-era reds flipped green as designed: the door apparatus
(Apparatus_Grounded_50cmOffCenter_FrontApproach_Blocks) and tick-13558
(indoor walkthrough) now assert the door BLOCKS; tick-22760 pins the
outdoor blocking invariant.
- The 4th (BSPStepUp D4) + 22760's lateral-slide delta are NOT cell-set
problems (probes prove the door is found + BSP-only dispatched;
BR-7 left both byte-identical) - filed as issue #116 (slide-response
family), D4 skipped with the issue reference.
- FindEnvCollisionsMultiCellTests migrated to the public entry (the A4
multi-cell halt now lives at the retail call site).
- New registry pins: per-cell query surface, outdoor-footprint-never-
indoor (#98 architectural), door-outdoor-cell membership, reflood.
- CameraCollisionIndoorTests rewritten against the building channel
(the isViewer-exemption pins died with the exemption).
Closes#99 (doors block both ways via registration-time cell membership
+ the straddle-spanning player cell array). #97 likely closed (the +5m
radial pad that produced phantom-collision candidates is gone) - verify
at T5. #98 stays closed ARCHITECTURALLY (outdoor footprints structurally
cannot reach interior cells; the cellar harness stays green).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Visual verification of Task 7 ship: doors block at dead-center (the
small Cylinder catches) but the BSP slab doesn't catch off-center
or inside-walking-out approaches. Probe-instrumented live capture
proves multi-part registration is correct — every door spawns with
shapes=cyl1+bsp1, and the BSP part is visited 135 times for a single
door at player approaches as close as 0.42 m, with cacheHit=True.
But zero [resolve-bldg] attributions for the BSP shape.
Three artifacts added:
1. TransitionTypes.cs — new [bsp-test] probe in the BSP collision
dispatch, fires BEFORE the cache lookup. Mirrors [cyl-test] on
the Cylinder branch. Distinguishes "cache miss → silent skip"
from "queried but no hit" (the latter doesn't show up in
[resolve-bldg] which only fires on attributed hits).
2. DoorCollisionApparatusTests.cs — new grounded test
(Apparatus_Grounded_50cmOffCenter_*) attempts to reproduce the
production bug via a seeded PhysicsBody (Contact + OnWalkable
+ ContactPlane + WalkablePolygon). Currently doesn't reproduce
because the apparatus's stub-terrain + synthetic-floor setup
diverges from production's real Holtburg geometry. Captured as
"documents-the-bug" — flip the assertion shape when the fix
lands.
3. docs/research/2026-05-24-door-collision-task7-shipped-but-bug-remains.md
— full session handoff. Identifies the remaining bug as a Path 5
(Contact branch + StepSphereUp) misbehavior at thin tall
obstacles, not in the multi-part registration we just shipped.
Leading hypothesis: DoStepUp's downward probe finds the same
flat floor on the OTHER side of the door (Holtburg cottages have
no Z change between exterior and interior floor), declares
step-up success, BSP collision returns OK, sphere walks through.
Recommended next move: relaunch with ACDREAM_DUMP_STEPUP=1 to
verify the hypothesis.
What this commit DOES NOT do: fix the remaining step-up bug. The
A6.P4 multi-part registration foundation is correct and stays.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Apparatus test (DoorCollisionApparatusTests) loads door GfxObj 0x010044B5
from the real dat, builds the door entity's shape list via
ShadowShapeBuilder, registers via RegisterMultiPart, and sweeps a player
sphere into the door from three angles. Pre-fix: all three assertions
fail — the sphere walks straight through. The [cyl-test] probe fires
every tick (the small Sphere shape is queried) but no [resolve-bldg] —
the per-Part BSP entry is never reached.
Root cause: ShadowObjectRegistry.GetNearbyObjects deduplicates on
entry.EntityId via HashSet<uint>. Pre-RegisterMultiPart each entity had
exactly one shadow row, so dedup-by-entityId correctly suppressed
multi-cell duplication. After Task 4's RegisterMultiPart introduced
multi-shape rows (1 Sphere + 1 per-Part-BSP for doors; potentially more
for creatures + items), the dedup silently drops everything after the
first. ShadowShapeBuilder emits Sphere shapes before Part-BSPs, so the
Sphere wins and the BSP is dropped — exactly the "Task 7 produced zero
[resolve-bldg] hits" finding from the 2026-05-24 evening handoff.
Fix: dedup on the full ShadowEntry. record-struct equality compares
all fields (EntityId, GfxObjId, Position, Rotation, Radius,
CollisionType, CylHeight, Scale, State, Flags, LocalPosition,
LocalRotation). Distinct shapes of the same entity are not equal and
make it through; the same shape registered in multiple cells (its
fields identical across calls) dedups exactly as before.
Apparatus verification post-fix: all 4 tests pass.
- Dead-center front approach: BLOCKED at Y=11.5 normal=(0,-1,0).
- 50 cm off-center: BLOCKED at Y=11.5 normal=(0,-1,0).
- Back approach from inside: BLOCKED at Y=12.8 normal=(0,+1,0).
- Diagnostic dump: BSP fires at tick 5.
What this fix DOES NOT do: switch live RegisterLiveEntityCollision to
use ShadowShapeBuilder + RegisterMultiPart. That's Task 7 of the
original plan, still reverted. With this foundation fix in place,
Task 7 should now actually deliver door blocking in production.
Test impact: 44/44 in the shape/registry/door scope pass. The broader
Physics suite shows the pre-existing PhysicsResolveCapture
static-state flakiness documented in CLAUDE.md — 6 baseline failures
without my new tests, 10 with them (4 extra are my apparatus tests'
IsPlayer-flag resolves getting captured by a concurrent Capture-test
race). Independent of this fix; verified by isolating each test
class.
Findings + apparatus reasoning:
docs/research/2026-05-24-door-dat-inspection-findings.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Erik