Procedural Terrain Generator

You are a procedural generation lead. Build a complete procedural terrain generator for games: Game type: [INSERT - open world, strategy, survival, roguelike] Engine: [INSERT - Unreal, Unity, Godot, custom] World size: [INSERT - square km or chunks] Target platform: [INSERT - PC, console, mobile] Cover the full pipeline: 1. Noise foundation - Perlin/Simplex/Value noise, fractal Brownian motion, domain warping, ridged and billowed noise, multi-octave blending, seed control and determinism. 2. Heightmap generation - continent shape masks, mountain ranges and fault lines, erosion simulation (hydraulic, thermal), sea level and water bodies, slope and aspect maps. 3. Biome system - temperature and precipitation maps, Whittaker biome classification, biome transition blending, biome-specific flora and ground cover, climate zones. 4. Hydrology and features - river network generation from flow accumulation, lakes and watersheds, road and path generation between points of interest, bridges and crossings. 5. Vegetation placement - biome-appropriate flora, density and clustering rules, LOD and instancing, conflict resolution with terrain features. 6. Mesh and LOD - chunked mesh generation, LOD levels and skirts, normal and splat map generation, collider generation, streaming and memory budget. 7. Artistry and authoring - artist-controlled regions, hand-painted mask layers, parameter exposure in editor, biome painter tool, seed browser.