Map Tile Design System

Auto-tiling for forest, mountain, ocean and lake terrain. Forest and mountain each provide four full variants. Ocean and lake share a single full variant (water reads as uniform), but ship five edge archetypes (sandy beach, rocky shore, bay, cape, twin coves) and four corner geometries per terrain — twenty edges, sixteen outer corners, and sixteen inverted corners — so long coastlines and inland shorelines never repeat the same shape. Edges are built from the same Q-curve technique as outer corners, biased so any pair tiles as one continuous coast — two adjacent bays read as one long inlet, two adjacent capes as one long peninsula. Variant selection is deterministic per cell (hash(x, y) % 5 for edges, % 4 for corners).