The Vuntra window trick — a passing pedestrian sees a plausible room through the shop glass with real
parallax, no geometry. One shared ShaderMaterial does single-cube interior mapping on the existing
window mesh (back wall + seeded shelves + side walls + floor/ceiling); per-shop variation via
aTangent/aTint/aSeed attributes, still 1 window draw/chunk. §3.5 held via the shared uHour/uNight +
aHours: night → open room glows warm, closed room dark.
v2 prime law: WINMAP is read from the URL in buildings.js (self-contained — no index.html seam; F
just needs a flags-table row). Flag-OFF byte-identical to v1 (windowQuad → v1 hoursQuad, v1
windowMaterial). Proven: flag-off windows MeshStandardMaterial w/ no winmap attrs; flag-on interior
ShaderMaterial; worst view 122-168 draws (<=300); 100% procedural (0 fetch delta vs ?noassets
baseline); 0 console errors; GOLDEN.hash untouched. Screenshots in docs/shots/laneB/winmap_*.
qa.sh --strict GREEN (4/4).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2a923b61e6