Raking Marble Field

"use client";

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

/**
 * RakingMarbleField — polished stone that only shows its veins in the light.
 *
 * A marble slab is computed once on the GPU (veins, their soft clouds, a fine
 * grain and a shallow relief where the veins are etched into the polish) and
 * kept in a texture. At rest the slab is almost blank: the veins sit a few
 * per cent off the ground colour, the way honed stone reads across a room.
 * Bring the pointer over it and a low light rakes across the surface from
 * where the pointer is: the veins darken, the relief catches on the side
 * facing away from the light, and a faint sheen sits in the polish. Take the
 * pointer away and the stone goes quiet again.
 *
 * Why a raking light: conservators and photographers light stone and

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}