oceanSeabed

The ground under the sea: one gradient-noise field mixed between sand and rock, lit by the scene's own sun and ambient, with the caustics the waves above focus onto it added on top. The simulation drives the cascade displacement map, the sand and rock maps the compute pass generates, and the terrain's world origin on this material as the clipmap recentres; the blend threshold, the tiling and the caustic strength are authored here. Sea-state presets in ~.modules.oceanPresets override these values.