Gaze Reticle Ring

Gaze reticle ring, a thin smooth flat ring 0.04 m across, 0.003 m thick, control tone; fill (0-1, default 0.6) sweeps a thin glowing accent arc clockwise from twelve o'clock. Hover widens it slightly and glows; pressed shrinks it.

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