Camera Gizmo

Camera gizmo, a small smooth rounded camera body 0.75 m up looking along +z, thin lines to a thin far frame 1 m ahead; fov (30-70 deg) and aspect (square, 4:3, 16:9) shape the frame, never below y = 0. The lens is a thin glowing accent ring.

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