Fumarole Vent

A fumarole vent breathing steam, lit from inside: a natural low irregular mound of fractured dark basalt 1.5 x 1.5 m and about 1 m tall, made by nature and never a chimney, stove or oven (no openings in its sides).

风格：low-poly, flat-shaded vertex colors, no textures, 3 materials: the shared opaque one plus a distinct surface (glass, water or chrome), which stays its own mesh through mergeAssets rather than merging into the rest; shares palette and scale with its kit