Velvet Mat Tile

Velvet rolling-mat floor tile, exactly 0.3 x 0.3 m and 0.004 m thick, deep black-green velvet ( with a nap sheen), dead flat with square edges so copies butt seamlessly into any size of mat; markings knob none.

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