Steam plume

Single soft steam plume about 3m tall, three or four rounded faceted cloud lobes rising and widening from a narrow base so it caps any chimney or vent, a density knob from a thin wisp to a full billow, cream and near-white with a faint cyan shadow side.

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