Grass Terrain Blob

Large organic grass terrain blob, ~9m across and 0.5m thick, flat walkable top at y=0, irregular rounded outline with gently faceted sloping sides, clean sculpted surface with no props baked in.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit