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No simulation runs per frame; everything that varies over // time is a closed-form function of precomputed per-cell data, evaluated // fresh every frame. // // LATTICE (built once per resize): four lath-family orientations are derived // from the octahedral dihedral angle, acos(1/3) = 70.5288deg — the angle // between the normals of any two adjacent {111} faces of the parent taenite // octahedron, so the four in-plane directions this pattern locks to are the // same four a real cut-and-etched octahedrite shows. Each family gets its // own set of parallel boundary lines (irregular spacing = uneven lath // thickness, still dead straight) built by projecting the canvas corners // onto that family's normal. Per cell, per family, a binary search finds the // enclosing band and how deep into it the cell sits (1 = band centre, 0 = at // a wall). The family with the DEEPEST local interior — not nearest-line, // deepest-interior — owns the cell; that argmax across four independent // roughly-uniform residuals splits the plane close to evenly and produces a // genuine interlocking parallelogram tiling at fixed angles, not a Voronoi // cell wall network (that shape belongs to background-ascii-voronoi-walls) // and not an organic grown boundary (background-ascii-domain-walls). // // ETCH FRONT (per frame, per cell): a single scalar delta = frontPos - s, // where s is the cell's position along a diagonal sweep axis independent of // the lattice angles (the physical bath direction, not a crystal direction) // and frontPos grows without bound at 1 s-unit per SWEEP_SECONDS. Taking // delta modulo one cycle width turns that unbounded growth into a periodic // rise -> idle -> fall pulse per cell: rises from 0 to 1 as the front first // reaches it (surfacing out of blank metal), holds at exactly 1 through a // long idle interior (fully etched), then eases back to 0 (repolished) well // before the front would need to "jump" back to the start — so the loop // point is a region that has already faded to blank, not a visible reset. // Cell brightness is developed * a per-cell contrast baked in at build time // (per-band hash + a boost near the cell's own family boundary, so // interlocking seams read a little brighter, like a grain boundary catching // the etch). Cells whose developed value is EXACTLY 1 (the idle interior, // not the ramps) add a small per-band sinusoidal shimmer phased along that // band's own axis, so the shimmer appears to travel down the lath's length. // // GLYPH: above a faint-cutoff the glyph is the owning family's slash // character (-, |, \, /, one per family, chosen by rounding each family's // angle to its nearest of those four), so the anisotropy is legible as // actual oriented line-work, not texture. Below the cutoff (unetched or // mid-repolish) a sparse subset of cells show a faint muted "." grain -- // the raw polished metal's own micro-texture, present everywhere the // crystal pattern hasn't (yet, or any longer) grown over it. // // Colour: canvas fill is --background (this is a self-contained backdrop, // not reliant on a parent already painting the token), grain is --ns-muted, // the etched pattern is --foreground with luminance as alpha, all read via // getComputedStyle and re-read on a documentElement class MutationObserver. // aria-hidden, pointer-events-none: it never listens for input and carries // no content. prefers-reduced-motion draws one static fully-etched frame // with no front and no shimmer. // --------------------------------------------------------------------------- const ORIENTED = ["-", "|", "\\", "/"] as const; // by family index const GRAIN_GLYPH = "."; const ALPHA_BUCKETS = 6; const OCTA_ANGLE = Math.acos(1 / 3); // ~70.5288deg, adjacent-{111}-normal angle const FAMILY_COUNT = 4; /** lath width per family, in cell-pitch multiples -- distinct plate widths */ const BAND_SPACING_CELLS = [7.5, 6.2, 8.6, 7.1]; const SPACING_JITTER = 0.22; // +-22% band-to-band thickness noise const SWEEP_ANGLE = (52 * Math.PI) / 180; // bath direction, independent of the lattice const SWEEP_SECONDS = 90; // time for the front to cross the diagonal once const RISE_W = 0.05; // surfacing ramp, in s-units const IDLE_W = 0.78; // fully-etched hold, in s-units const FALL_W = 0.1; // repolish ramp, in s-units const S_RANGE = RISE_W + IDLE_W + FALL_W; const FAINT_CUTOFF = 0.32; const CONTRAST_MIN = 0.5; const CONTRAST_SPAN = 0.5; const EDGE_BOOST = 0.28; const SHIMMER_AMP = 0.09; const SHIMMER_FREQ = 0.6; // rad/s const SHIMMER_SPATIAL_FREQ = 0.02; // rad/px along the band's own axis const BAND_PHASE_STEP = 1.37; // rad per band id, decorrelates adjacent bands const GRAIN_DENSITY = 0.14; const GRAIN_ALPHA = 0.15; const DT_MAX = 0.05; function mulberry32(seed: number) { let a = seed >>> 0; return () => { a = (a + 0x6d2b79f5) >>> 0; let t = Math.imul(a ^ (a >>> 15), 1 | a); t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t; return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } /** cheap deterministic hash -> [0,1), used for per-band contrast. */ function hash01(a: number, b: number, seed: number): number { let h = (Math.imul(a, 374761393) + Math.imul(b, 668265263) + seed) | 0; h = Math.imul(h ^ (h >>> 15), 2246822519); h ^= h >>> 13; h = Math.imul(h, 3266489917); h ^= h >>> 16; return (h >>> 0) / 4294967296; } function smooth01(x: number): number { const c = x < 0 ? 0 : x > 1 ? 1 : x; return c * c * (3 - 2 * c); } /** irregular-spacing boundary line positions covering [minV, maxV] with margin. */ function buildBoundaries( minV: number, maxV: number, spacing: number, rand: () => number ): Float64Array { const arr: number[] = []; let pos = minV - spacing; arr.push(pos); const end = maxV + spacing; while (pos < end) { pos += Math.max(2, spacing * (1 + (rand() * 2 - 1) * SPACING_JITTER)); arr.push(pos); } return Float64Array.from(arr); } function bandIndexOf(boundaries: Float64Array, u: number): number { const last = boundaries.length - 1; if (u <= boundaries[0]) return 0; if (u >= boundaries[last]) return last - 1; let lo = 0; let hi = last - 1; while (lo < hi) { const mid = (lo + hi + 1) >> 1; if (boundaries[mid] <= u) lo = mid; else hi = mid - 1; } return lo; } export interface KamaciteEtchProps { /** grid cell size in px -- also sets the lath-family spacing scale */ cellSize?: number; className?: string; } export function KamaciteEtch({ cellSize = 13, className = "", }: KamaciteEtchProps) { const canvasRef = useRef(null); useEffect(() => { const canvas = canvasRef.current; if (!canvas) return; const ctx = canvas.getContext("2d"); if (!ctx) return; const reduced = window.matchMedia( "(prefers-reduced-motion: reduce)" ).matches; let bg = ""; let fg = "currentColor"; let muted = "currentColor"; let cellW = cellSize; let cellH = cellSize; let cols = 0; let rows = 0; let n = 0; let dpr = 1; let sized = false; let ready = false; let disposed = false; let sArr = new Float32Array(0); let contrastArr = new Float32Array(0); let phaseArr = new Float32Array(0); let ownerArr = new Uint8Array(0); let grainArr = new Uint8Array(0); const fgBuckets: number[][] = Array.from( { length: ALPHA_BUCKETS }, () => [] ); const grainList: number[] = []; const readTokens = () => { fg = getComputedStyle(canvas).color; const root = getComputedStyle(document.documentElement); // never a colour literal: if the token is ever missing, fall back to the // live computed page background, which still resolves per theme. bg = root.getPropertyValue("--background").trim() || getComputedStyle(document.body).backgroundColor; muted = root.getPropertyValue("--ns-muted").trim() || fg; }; const measureCell = (fontFamily: string) => { const off = document.createElement("canvas"); const octx = off.getContext("2d"); if (!octx) return; octx.font = `${cellSize}px ${fontFamily}`; cellW = Math.max(4, octx.measureText("MMMMMMMMMM").width / 10); cellH = cellSize; }; /** builds the four lath families and every per-cell derived value once. */ const buildLattice = () => { const W = cols * cellW; const H = rows * cellH; const pitch = (cellW + cellH) / 2; const corners: [number, number][] = [ [0, 0], [W, 0], [0, H], [W, H], ]; const dirs: { x: number; y: number }[] = []; const normals: { x: number; y: number }[] = []; const boundaries: Float64Array[] = []; const famRand = mulberry32(0x4b616d31); for (let k = 0; k < FAMILY_COUNT; k++) { const a = (((k * OCTA_ANGLE) % Math.PI) + Math.PI) % Math.PI; const dx = Math.cos(a); const dy = Math.sin(a); dirs.push({ x: dx, y: dy }); const nx = -dy; const ny = dx; normals.push({ x: nx, y: ny }); let minU = Infinity; let maxU = -Infinity; for (const [cx, cy] of corners) { const u = cx * nx + cy * ny; if (u < minU) minU = u; if (u > maxU) maxU = u; } const spacing = BAND_SPACING_CELLS[k]! * pitch; boundaries.push(buildBoundaries(minU, maxU, spacing, famRand)); } const sweepDx = Math.cos(SWEEP_ANGLE); const sweepDy = Math.sin(SWEEP_ANGLE); let sMin = Infinity; let sMax = -Infinity; for (const [cx, cy] of corners) { const s = cx * sweepDx + cy * sweepDy; if (s < sMin) sMin = s; if (s > sMax) sMax = s; } const sSpan = Math.max(1e-6, sMax - sMin); const grainRand = mulberry32(0x67721e9); let i = 0; for (let gy = 0; gy < rows; gy++) { const y = gy * cellH + cellH / 2; for (let gx = 0; gx < cols; gx++, i++) { const x = gx * cellW + cellW / 2; sArr[i] = (x * sweepDx + y * sweepDy - sMin) / sSpan; let bestFamily = 0; let bestResidual = -1; let bestBandId = 0; for (let k = 0; k < FAMILY_COUNT; k++) { const nrm = normals[k]!; const u = x * nrm.x + y * nrm.y; const b = boundaries[k]!; const bi = bandIndexOf(b, u); const lo = b[bi]!; const hi = b[bi + 1]!; const half = (hi - lo) / 2; const mid = (lo + hi) / 2; const residual = half > 0 ? 1 - Math.abs(u - mid) / half : 0; if (residual > bestResidual) { bestResidual = residual; bestFamily = k; bestBandId = bi; } } ownerArr[i] = bestFamily; const base = CONTRAST_MIN + CONTRAST_SPAN * hash01(bestFamily, bestBandId, 0x1357a2c1); const edge = (1 - Math.max(0, bestResidual)) * EDGE_BOOST; contrastArr[i] = Math.min(1.15, base * (1 + edge)); const dr = dirs[bestFamily]!; phaseArr[i] = (x * dr.x + y * dr.y) * SHIMMER_SPATIAL_FREQ + bestBandId * BAND_PHASE_STEP; grainArr[i] = grainRand() < GRAIN_DENSITY ? 1 : 0; } } }; const resize = () => { const { width, height } = canvas.getBoundingClientRect(); if (width < 2 || height < 2) { sized = false; return; } const isCard = !!canvas.closest("[data-autoplay-root]"); dpr = isCard ? Math.min(0.6, window.devicePixelRatio || 1) : Math.min(window.devicePixelRatio || 1, 2); canvas.width = Math.max(1, Math.round(width * dpr)); canvas.height = Math.max(1, Math.round(height * dpr)); ctx.setTransform(dpr, 0, 0, dpr, 0, 0); const fontFamily = getComputedStyle(canvas).fontFamily; measureCell(fontFamily); ctx.font = `${cellSize}px ${fontFamily}`; ctx.textAlign = "center"; ctx.textBaseline = "middle"; cols = Math.max(8, Math.ceil(width / cellW)); rows = Math.max(8, Math.ceil(height / cellH)); n = cols * rows; sArr = new Float32Array(n); contrastArr = new Float32Array(n); phaseArr = new Float32Array(n); ownerArr = new Uint8Array(n); grainArr = new Uint8Array(n); buildLattice(); sized = true; }; let resizeTimer: ReturnType | null = null; const onResize = () => { if (resizeTimer) clearTimeout(resizeTimer); resizeTimer = setTimeout(() => { resizeTimer = null; resize(); if (reduced) draw(0, true); }, 150); }; const draw = (tGlobal: number, staticFull: boolean) => { if (!sized) return; const w = cols * cellW; const h = rows * cellH; ctx.fillStyle = bg; ctx.fillRect(0, 0, w, h); for (let b = 0; b < ALPHA_BUCKETS; b++) fgBuckets[b]!.length = 0; grainList.length = 0; const frontPos = tGlobal / SWEEP_SECONDS; for (let i = 0; i < n; i++) { let developed: number; if (staticFull) { developed = 1; } else { const delta = frontPos - sArr[i]!; const dm = ((delta % S_RANGE) + S_RANGE) % S_RANGE; if (dm < RISE_W) developed = smooth01(dm / RISE_W); else if (dm < RISE_W + IDLE_W) developed = 1; else developed = 1 - smooth01((dm - RISE_W - IDLE_W) / FALL_W); } let brightness = developed * contrastArr[i]!; if (!staticFull && developed === 1) { brightness += SHIMMER_AMP * contrastArr[i]! * Math.sin(tGlobal * SHIMMER_FREQ + phaseArr[i]!); } if (brightness < 0) brightness = 0; else if (brightness > 1) brightness = 1; if (brightness >= FAINT_CUTOFF) { const bucket = Math.min( ALPHA_BUCKETS - 1, Math.floor(brightness * ALPHA_BUCKETS) ); fgBuckets[bucket]!.push(i); } else if (grainArr[i]) { grainList.push(i); } } if (grainList.length) { ctx.fillStyle = muted; ctx.globalAlpha = GRAIN_ALPHA; for (let k = 0; k < grainList.length; k++) { const idx = grainList[k]!; const gx = idx % cols; const gy = (idx - gx) / cols; ctx.fillText( GRAIN_GLYPH, gx * cellW + cellW / 2, gy * cellH + cellH / 2 ); } } ctx.fillStyle = fg; for (let b = 0; b < ALPHA_BUCKETS; b++) { const list = fgBuckets[b]!; if (!list.length) continue; ctx.globalAlpha = 0.22 + (b / (ALPHA_BUCKETS - 1)) * 0.78; for (let k = 0; k < list.length; k++) { const idx = list[k]!; const gx = idx % cols; const gy = (idx - gx) / cols; ctx.fillText( ORIENTED[ownerArr[idx]!], gx * cellW + cellW / 2, gy * cellH + cellH / 2 ); } } ctx.globalAlpha = 1; }; let raf = 0; let last = 0; let t = 0; const loop = (now: number) => { const dt = last ? Math.min(DT_MAX, (now - last) / 1000) : 1 / 60; last = now; t += dt; draw(t, false); if (!document.hidden) raf = requestAnimationFrame(loop); }; const onVis = () => { if (!document.hidden && !reduced && ready) { // a queued frame from just before hiding still fires on return; // cancel it so the front doesn't advance at double rate forever cancelAnimationFrame(raf); last = 0; raf = requestAnimationFrame(loop); } }; const mo = new MutationObserver(() => { readTokens(); if (reduced) draw(0, true); }); mo.observe(document.documentElement, { attributes: true, attributeFilter: ["class"], }); document.fonts.ready.then(() => { if (disposed) return; readTokens(); resize(); ready = true; if (reduced) { draw(0, true); } else { raf = requestAnimationFrame(loop); } }); window.addEventListener("resize", onResize); document.addEventListener("visibilitychange", onVis); return () => { disposed = true; cancelAnimationFrame(raf); if (resizeTimer) clearTimeout(resizeTimer); mo.disconnect(); window.removeEventListener("resize", onResize); document.removeEventListener("visibilitychange", onVis); }; }, [cellSize]); return (