Tiny World Island & Planes

Coordinate system + camera-facing side

• The home island is centred at world origin. Top of grass = y = 0. Underside of dirt slab + inverted stepped underside extends down from there.
• GRID (default 8, max 20, ranges from HOME_GRID_MIN to HOME_GRID_MAX) × TILE (=1) sets the edge length. Half-width = (GRID * TILE) / 2.
• DIRT_H = 0.55 — visible dirt block height.
• Default camera: DEFAULT_AZIMUTH = π * 0.32, DEFAULT_POLAR = π * 0.30 → camera sits in the +X +Z quadrant looking back at origin. The +Z face is the "front" of the island (most camera-facing side).

buildHomeBorder() flow

Defined ~line 16340. Rebuilds the island's undersides and edge dressing every time the home grid changes: