Aperture Iris Reveal

"use client";

import { useEffect, useId, useRef, useState } from "react";

/**
 * A photograph revealed by a camera iris: straight metal blades part from the
 * centre, twisting as they open, until the whole frame is clear — while a
 * corner readout clicks down through the f-stops, ƒ/22 to ƒ/1.4.
 *
 * THE GEOMETRY IS AN IRIS, NOT A CIRCLE WIPE. The opening is a regular polygon
 * (one side per blade) that grows and turns. Each blade is the wedge between
 * two neighbouring polygon edges extended out past the frame, so the seams
 * between blades are those extended edges — the pinwheel you see looking into
 * a lens. At zero radius every seam meets in the centre; at full radius the
 * polygon's inner circle clears the frame's corners and every blade is gone.
 *
 * NO REACT STATE PER FRAME. The blade paths are rewritten directly on the SVG
 * from a requestAnimationFrame loop driven by elapsed time, so the reveal takes

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}