Hot Spring Pool

A hot spring pool: a shallow rounded pool 3.0 x 2.5 m inside a travertine rim of cream stepped rimstone lips (scalloped terracette ledges as real steps, ochre-stained where the water spills over), a flat base at y=0 to sit on the terrain's hot-spring terraces.

风格：low-poly, flat-shaded vertex colors, no textures, 2 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