Validated live by Wassim.
- Wall grid is anchored to the wall PLANE (its foot), not the moving ghost, so
sliding a door/window only moves the reveal patch — the lattice stays a fixed
snap reference instead of "following" the opening.
- DoubleSide so the lattice renders when an opening is handled from the far side.
- depthTest is conditional: ON for the floor (the ground occludes a sub-floor
lattice) and OFF on a wall (visible through the wall from the opposite side).
- Resolution change is a uniform write only — `cellSize` no longer rebuilds the
uniform + material (which recompiled the shader and stalled on every step).
- Y follow snaps instantly (was a lerp); `gridY` state only updates on change.
- Reveal radius 5 → 12.
- Door/window publish the wall surface on mount (+ claim the pointer for the
wall) so the grid is vertical from the FIRST frame — no horizontal flash.
- Export the active-placement-surface module so the opening tools can publish.
- Drop the editor-side "Show Grid" setting: the 3D grid is now purely a
placement aid (shown only while placing/moving in grid-snap mode).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
