frame-panel

A spatial UI panel pinned to an XR reference frame (see xr-frames). You give it a frame, a position (or a preset), and a placeholder title or your own SVG; it renders the panel there and reveals it as you look toward it (gazeReveal).

This is the substrate for body-anchored UI — a waist "quick access / holster" panel revealed by looking down, inventory panels over either shoulder revealed by glancing back. The panel is FIXED in its frame (it doesn't billboard); the frame itself moves (e.g. body follows your torso), so the panel rides with you and is oriented once to face your head.

Anchor presets (in the body frame, metres; y is absolute since body sits at the floor): waist, left-shoulder, right-shoulder.