THE BUG (pinned deterministically by the new CornerFloodReplayTests harness — real
Holtburg cells, captured corner-press scenario): a smooth 2 cm/step monotonic eye
sweep across the 0172↔0173↔0171 doorway produced a NON-monotonic flood — on ~10 of
61 steps the player's room (0172) vanished from the flood entirely or collapsed to
a sub-pixel sliver, taking its downstream chain (016F, the outside view) with it.
Live, those isolated frames are the §4 background strobe: openings/passages flash
the clear color during transitions, and the corner press shows background at the
angles that park the eye near the doorway plane.
TWO root causes, both fixed:
1. ApplyReciprocalClip ran the reciprocal portal polygon through the legacy
divide-first ProjectToNdc + 2D Intersect path, justified by "the reciprocal is
never near the eye." That assumption is exactly false at doorways/corners: the
reciprocal IS the same opening whose plane the eye presses against (2-60 cm).
ProjectToNdc's MinW=0.05 eye-clip + side-plane clip + divide is knife-edge
there — 2 cm eye moves flipped its output between a no-op and a duplicated-
vertex hairline that ground the healthy region down to <3 distinct vertices.
FIX: route the reciprocal through the SAME homogeneous pipeline as the forward
clip (ProjectToClip + ClipToRegion) — which is what retail does:
PView::OtherPortalClip (decomp:433524-433563) runs the reciprocal through the
very same GetClip(finish=1) → ACRender::polyClipFinish homogeneous clipper.
Also ported retail's skip: exact_match portals (CCellPortal.exact_match,
acclient.h:32300; PView::ClipPortals :433689) bypass the reciprocal clip —
both sides share the same polygon, so re-clipping is redundant.
2. CellView.CanonicalKey missed COLLINEAR re-emissions: the homogeneous region
clipper legitimately inserts intersection vertices ON a subject edge when a
region edge grazes it, so BFS re-clip rounds re-emit the SAME geometric region
with 1-2 extra collinear edge vertices — keyed as distinct, defeating the
dedup and accumulating duplicate polygons (this was the real mechanism behind
the historical "float drift defeats the dedup" rationale that had parked the
reciprocal on the unstable path). FIX: canonicalize away collinear snapped
points (exact integer cross-products on the 1e-3 NDC grid) so the key is
purely a function of the region's corners.
Conformance: CornerSweep_FloodIsCompleteAndMonotone pins the fixed behavior —
61-step monotonic eye sweep ⇒ full flood every step, outside view always reached,
player-room region monotone (was: clean shrink 4.000→2.879 with zero drops, vs
~10 glitch steps before). Diagnostic facts (trace diff, hop microscope, primitive
scratch) retained as the apparatus.
Suites: App 223 green (incl. Build_AppliesReciprocalOtherPortalClip, now passing
with proper tightening AND dedup), Core 1377 green + the 4 pre-existing #99-era
failures + 1 skip, UI 420, Net 294. Visual gate pending: corner press, room↔room,
cellar↔floor, indoor↔outdoor transitions.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Checkpoint of the unified retail-faithful indoor render. The two-week HANG/grey is fixed and the
interior seals (live-verified by the user). Commits the session render-rewrite foundation together
with the fixes that made it functional.
- HANG fix: PortalVisibilityBuilder.Build portal flood did not terminate (the faithful ProjectToClip
near-side clip drifts per round, defeating the CellView dedup; the BFS had no bound after U.2a removed
MaxReprocessPerCell). Fix = drift-tolerant snapped/canonical CellView.Add dedup (PortalView.cs) plus
restored MaxReprocessPerCell=16 bounded re-enqueue (PortalVisibilityBuilder.cs). Re-enqueue is kept
(load-bearing for late-slice propagation, Build_ViewGrowthAfterDoneCell_PropagatesNewSlicesToExit);
only its count is capped. CellViewDedupTests added.
- Seal (DrawCells Task 2): RetailPViewRenderer.DrawEnvCellShells draws EVERY visible cell via
IndoorDrawPlan.ShellPass (was gated on the ClipFrameAssembler slot filter, leaving slot-less cells grey).
- Look-in FPS: GameWindow exterior look-in candidates limited to the player landblock +-1 (was all ~81
loaded LBs iterated every outdoor frame). No behaviour change (far cells were >48m, already culled).
Remaining dominant issue = the FLAP at transitions: viewer-cell metastability (render roots at the
camera-eye cell, which oscillates outdoor-indoor as the 3rd-person boom drifts across the doorway,
confirmed in render-sig). SEPARATE fix, NOT the DrawCells port. Full handoff + flap fix plan + tracked
follow-ups (#78 terrain, look-in-from-inside, look-in FPS, L-spotlight):
docs/research/2026-06-07-indoor-render-session-handoff.md.
Baselines: build 0 err; App.Tests 210/210; Core.Tests 1331 pass / 4 fail (pre-existing) / 1 skip.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
