Virtual Thumbstick

Virtual thumbstick, a thin matte disc base 0.08 m across, 0.004 m thick, under a smooth domed cap 0.04 m across; direction (centre or one of eight) shifts the cap 0.012 m that way, tilted 10 deg, and a thin accent arc glows on that side of the base.

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