Root cause: ShadowObjectRegistry.GetNearbyObjects gated the outdoor radial sweep
whenever primaryCellId is an indoor cell — this was the issue-#98 fix that stops the
cottage-floor GfxObj from capping the player's head sphere from the cellar below.
But the camera probe (ObjectInfoState.IsViewer, 0x004) also sweeps with an indoor
primary cell, and the only geometry that encloses a Holtburg cottage in acdream's data
model is the landblock-baked exterior-shell GfxObj (registered cellScope=0, outdoor).
Result: the camera's spring-arm sweep found nothing and flew to full chase distance
(eye ~3.4 m back, outside the player's cell 90% of frames — root cause of all three
post-flap residuals: transparent outer walls, terrain-through-floor, grey stairs).
Fix (Option A, retail-faithful): add isViewer parameter (default false, all existing
callers keep the gate) to GetNearbyObjects. Thread oi.IsViewer from FindObjCollisions
(TransitionTypes.cs ~line 2307) through to the gate. When isViewer=true the outdoor
sweep runs regardless of indoor primary cell — matching retail's SmartBox::update_viewer
(:92761) which calls find_obj_collisions (:308918) with no indoor-cell restriction.
The #98 gate remains in force for IsPlayer and all other non-viewer sweeps.
Retail anchors:
- SmartBox::update_viewer @ acclient_2013_pseudo_c.txt:92761 — viewer transition
finds geometry via find_obj_collisions; no indoor gate
- find_obj_collisions @ :308918 — iterates shadow_object_list unconditionally
- CObjCell::find_cell_list @ :308751-308769 — retail's own indoor/outdoor branch
(the model that makes the #98 gate correct for the player)
Also fixes a test-fixture geometry bug: the original RED test had
gfxLeaf.BoundingSphere.Origin in world space (0, ExteriorWallY, 96) instead of
object-local space (0, 0, 0), causing NodeIntersects to return false even when the
gate was bypassed. Corrected to local space; wall polygon vertices/plane also
expressed in local space relative to the GfxObj origin.
Tests (3 new, 1 renamed):
- SweepEye_IndoorCellExteriorGfxObjWall_StoppedByExteriorShell_AfterViewerGateExemption:
was RED (_CurrentlyFails); now GREEN — camera sweep stopped by exterior GfxObj wall
- GetNearbyObjects_IndoorPrimaryCell_NonViewer_DoesNotReturnOutdoorGfxObj: #98 guard
(isViewer=false keeps the gate → GfxObj NOT returned)
- GetNearbyObjects_IndoorPrimaryCell_IsViewer_DoesReturnOutdoorGfxObj: viewer-exempt
guard (isViewer=true bypasses gate → GfxObj IS returned)
App.Tests: 154 pass / 0 fail (was 151/1). Core.Tests: 15 fail (same pre-existing
static-leak flakiness, unchanged from baseline).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Root cause (b): ShadowObjectRegistry.GetNearbyObjects (line 480) returns early
when primaryCellId is an indoor cell, skipping the outdoor radial sweep that
contains the landblock-baked cottage exterior-shell GfxObj. The issue-#98 fix
that prevents the player's head sphere from being capped by the cottage floor
also prevents the IsViewer camera sweep from finding the exterior building shell.
Result: camera passes through exterior walls unimpeded, driving the residual
transparent-walls symptom after the U.4c flap fix.
Evidence: live capture shows eyeInRoot=n ~90% of frames, eye-player distance
3.43m (full chase, no pull-in). RED test deterministically reproduces: synthetic
indoor cell (0xA9B40175) + exterior GfxObj registered at cellScope=0; probe
SweepEye returns pulledIn=0.0000m (full eye distance Y=5.0, wall at Y=4.0).
Fix design: exempt IsViewer from the indoor-primary early-return gate in
GetNearbyObjects — retail's find_obj_collisions (named-retail :308918) has no
indoor/outdoor cell gate; the acdream fix is correct only for IsPlayer.
Apparatus committed:
- tests/AcDream.App.Tests/Rendering/CameraCollisionIndoorTests.cs (RED test)
- docs/research/2026-05-31-camera-collision-indoor-diagnosis.md (findings + design)
- PhysicsCameraCollisionProbe.cs [flap-sweep] diagnostic retained (U.4c spike)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
