Alley Concrete Tile

4.0 x 4.0m worn back-alley concrete module for the kit grid, 0.05 m thick slab: one module that builds a whole alley floor from a piece knob (plain, straight, corner, t-junction, crossroads, gully end).

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