Bounce Light Field

"use client";

import { useEffect, useRef } from "react";
import type { CSSProperties, ReactNode } from "react";

/**
 * BounceLightField: a dark room seen from above, lit by a lamp you carry.
 * The pointer is the lamp. Light pours across the floor, every slab throws a
 * real shadow (hard near its base, softening with distance, exactly as an
 * area light does), and light that lands on a slab bounces off it in the
 * accent colour, so the shadows fill with a faint coloured glow. A press
 * leaves a small ember of light behind; up to three burn and slowly fade.
 *
 * This is real 2D global illumination by RADIANCE CASCADES (Alexander
 * Sannikov's method), in WebGL2 fragment shaders:
 *   - the slabs are baked once into a distance field, the lamps stay analytic;
 *   - six cascades of probes trace rays: cascade 0 has a probe every 2 px
 *     looking in 4 directions over a 2 px interval, and each cascade above

  // ---------------------------------------------------------------
  // Full source available with a viberdy Pro subscription.
  // https://viberdy.dev/pricing
  // ---------------------------------------------------------------
}