Walls used THREE's ExtrudeGeometry UVs, which restart at each wall's local
start/end — so finishes seamed at wall joins, showed a mid-face axis-switch
stripe, and didn't line up with the roof gable. Re-project the render mesh's
UVs in WORLD space (1 unit = 1 m), matching roof-system's pushRoofUv exactly:
vertical faces U = ±worldX/Z, V = 1 - worldY. De-indexes so each triangle uses
its own face normal (no edge seams). Applied only to the render mesh; collision
and floorplan geometry keep the original UVs. Now walls tile continuously
across segments and meet the gable seamlessly.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
