First-fix from the visual-gate-failure handoff: an empty OutsideView means
"no outdoors visible from here," not "all outdoors." When inside a building
with an empty clipped mask, Step 4 now draws NO terrain/scenery instead of
disabling the stencil and flooding ungated terrain over the cell interior
(the Step-3 walls already occupy the framebuffer). Visual-confirmed: Holtburg
cottage cellar walls are solid now, no terrain bleed-through.
Also adds portal diagnostics that root-caused so-called "Bug B":
- PortalVisibilityBuilder: per-camera-cell CAMPORTAL census (polyLen +
side-test result) emitted BEFORE the BFS guards, so an empty OUTSIDEVIEW
can be traced to the exact gate.
- A8CellAudit `portals`: replicate BuildLoadedCell's polygon-vertex
resolution so PortalPolygons[i] validity is checkable offline.
Finding: the builder is largely CORRECT — it produces narrowed clipped
OutsideView regions for most cells (0172/0173/0162/015E/0165/016F). The
empty cases are mostly legitimate (windowless cellar can't see out; the
3rd-person camera eye on the outdoor side of a front-door plane culls that
exit). The handoff's Finding 2 ("under-produces, never narrows") is
substantially not real. Remaining wall-missing regressions in OTHER
buildings live in the cross-building Step-5 enforcement, escalated separately.
All gated behind ACDREAM_A8_INDOOR_BRANCH=1; default play unaffected.
App tests 108/108.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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