Rotary Dial

Rotary dial, a smooth matte disc knob 0.05 m across, 0.008 m thick, with one thin pointer line; value (0-1, default 0.5) turns it over a 270 deg sweep, and a thin glowing accent arc round it runs from the start to the value. Hover floats it up and glows.

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