Old-world concrete tile

4x4m cracked old-world concrete pad tile, 0.1m slab with a flat top at y=0 and flat vertical edges, faint expansion-joint grooves and hairline cracks with moss creeping into the seams, pale galvanised grey with warm stain patches, no props.

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