Live ACDREAM_PROBE_FLAP capture (Holtburg cottage/cellar) proved the V1 camera
spring-arm already contains the eye (eyeInRoot=Y 99.75%, viewerCell never 0,
indoor collide 97.6% in 0174). The dominant inside-cottage bluish void is the
render-sealing residual C (DrawPortal), NOT the camera.
This spec scopes the FAITHFUL completion of Residual A: port the two missing
update_viewer pieces verbatim — the indoor start-cell seated at the pivot via
CPhysicsObj::AdjustPosition (pc:280009) → CEnvCell::find_visible_child_cell
(pc:311397), plus the two AdjustPosition/snap-to-player fallbacks — and land
FindVisibleChildCell (which residual C also needs).
Faithful layering (mirrors retail SmartBox→CPhysicsObj): primitives in Core
(PhysicsEngine.AdjustPosition + CellTransit.FindVisibleChildCell + ResolveResult.Ok),
orchestration in App PhysicsCameraCollisionProbe.SweepEye. Deterministic crux test
(start-cell resolution) in Core.Tests with the cottage fixtures; SweepEye glue in
App.Tests. Visible payoff is narrow (the cellar-corner, point 3); the cottage-room
void stays for residual C.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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