Seven tall photographic prints stand on their bottom edges along a brass rail set into a dark polished floor, in front of a charcoal wall with one pool of light. The whole set is drawn in raw WebGL 2 with a real camera: the floor mirrors each print with a blur that grows where the resin is smudged, a softbox throws soft shadows, colour from the photographs spills onto the ground, and a lens pass keeps the middle print sharp while the others fall out of focus. Drag, use the arrows or wait, and the row glides round with weight. Each print is a rigid slab, so a change of speed tips it onto one bottom corner and it rattles back to rest, corner to corner, faster and faster. On phones the camera pulls back so the middle print still fits, and without WebGL a layered image version takes over.
import { useCallback, useEffect, useRef, useState } from "react";
import { useReducedMotion } from "framer-motion";
/** The prints, in the order they come round. `focus` is the crop centre (0 to 1), `tone` shows until the photo arrives. */
const plates = [
{ title: "Tulle, scarlet", src: "https://images.pexels.com/photos/31167809/pexels-photo-31167809.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman with dark lipstick wrapped in a cloud of red tulle against a black backdrop", focus: [0.5, 0.36], tone: "#7a0f14" },
{ title: "Pleats on oxblood", src: "https://images.pexels.com/photos/31422879/pexels-photo-31422879.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman in profile wearing a pale pink pleated dress against a deep red backdrop", focus: [0.5, 0.4], tone: "#5a0a12" },
{ title: "Lacquer and paper", src: "https://images.pexels.com/photos/33798257/pexels-photo-33798257.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman in a glossy red dress and long red gloves holding a crumpled red paper flag", focus: [0.5, 0.42], tone: "#a3121a" },
{ title: "The black fan", src: "https://images.pexels.com/photos/36900256/pexels-photo-36900256.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman in a white top holding a large black fan in front of a red backdrop", focus: [0.5, 0.42], tone: "#6e1410" },
{ title: "Suit, carmine", src: "https://images.pexels.com/photos/38887203/pexels-photo-38887203.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman in a red trouser suit standing against a matching dark red backdrop", focus: [0.5, 0.4], tone: "#8a0f1c" },
{ title: "Turn in crimson", src: "https://images.pexels.com/photos/31422870/pexels-photo-31422870.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman twirling in a red pleated dress on a red studio floor", focus: [0.5, 0.5], tone: "#6a0a14" },
{ title: "Coat off the shoulder", src: "https://images.pexels.com/photos/21352928/pexels-photo-21352928.jpeg?auto=compress&cs=tinysrgb&w=900", alt: "Woman with a black coat slung over one shoulder against a hot pink and red backdrop", focus: [0.5, 0.4], tone: "#a80f3a" },
];
const N = plates.length;
const MASTHEAD = "Rouge"; // the wordmark in the top corner
const HOLD_MS = 3400; // rest between automatic turns
const SPRING = 34; // pull of the carriage toward the chosen print
const DAMPING = 7.6; // lower for more overshoot
const ROCK_GAIN = 0.072; // how hard a change of speed tips the prints
const TEX_W = 640;
const TEX_H = 904;
const SERIF = '"Didot", "Bodoni 72", "Bodoni MT", "Playfair Display", "Libre Bodoni", Georgia, serif';
const GROTESK = '"Inter Tight", "Inter", ui-sans-serif, system-ui, sans-serif';
const mod = (a: number, n: number) => ((a % n) + n) % n;
const clamp = (v: number, lo: number, hi: number) => Math.min(hi, Math.max(lo, v));
// Geometry of the set, in metres. A print is 1.06 wide and 1.5 tall and stands on its bottom edge.
const HX = 0.53;
const HY = 0.75;
const ALPHA = Math.atan(HX / HY); // lean at which a print would balance on one corner
const P2 = (3 * 9.81) / (4 * Math.hypot(HX, HY)); // rocking frequency squared of a slab this size
const RING = 3.4;
const STEP = 0.36;
const GLSL_HEAD = `#version 300 es
precision highp float;
precision highp sampler2DArray;
const int NP = 7;
const vec2 HS = vec2(${HX}, ${HY});
const float ZW = -3.7;
const vec3 LPOS = vec3(-2.7, 5.0, 5.6);
const vec3 LAIM = vec3(0.0, 0.7, 0.3);
uniform vec3 uPc[7];
uniform vec3 uPu[7];
uniform vec3 uPv[7];
uniform float uPl[7];
uniform float uPk[7];
uniform sampler2DArray uTex;
uniform vec3 uCam, uRt, uUp, uFw;
uniform float uTan, uAspect, uFocus, uAperture, uTime;
float ign(vec2 p) { return fract(52.9829189 * fract(dot(p, vec2(0.06711056, 0.00583715)))); }
float hash(vec2 p) { p = fract(p * vec2(123.34, 456.21)); p += dot(p, p + 45.32); return fract(p.x * p.y); }
float vnoise(vec2 p) {
vec2 i = floor(p), f = fract(p); f = f * f * (3.0 - 2.0 * f);
return mix(mix(hash(i), hash(i + vec2(1, 0)), f.x), mix(hash(i + vec2(0, 1)), hash(i + vec2(1, 1)), f.x), f.y);
}
float fbm(vec2 p) { return 0.5 * vnoise(p) + 0.25 * vnoise(p * 2.1 + 7.3) + 0.125 * vnoise(p * 4.3 + 1.7) + 0.0625 * vnoise(p * 8.9); }
bool hitPanel(int i, vec3 ro, vec3 rd, out float t, out vec2 ab) {
vec3 n = cross(uPu[i], uPv[i]);
float d = dot(rd, n);
if (abs(d) < 1e-5) return false;
t = dot(uPc[i] - ro, n) / d;
if (t <= 1e-3) return false;
vec3 p = ro + rd * t - uPc[i];
ab = vec2(dot(p, uPu[i]), dot(p, uPv[i]));
return abs(ab.x) < HS.x && abs(ab.y) < HS.y;
}
// The key light: one big softbox high on the left, aimed at the middle print, falling off to the sides.
vec3 keyAt(vec3 P, out vec3 l) {
vec3 d = LPOS - P;
float r2 = dot(d, d);
l = d * inversesqrt(r2);
float spot = smoothstep(0.86, 0.985, dot(-l, normalize(LAIM - LPOS)));
return vec3(1.0, 0.955, 0.9) * (72.0 * (0.1 + 0.9 * spot) / r2);
}
float keyVis(vec3 P, int skip, float seed) {
vec3 fw = normalize(LAIM - LPOS);
vec3 lt = normalize(cross(fw, vec3(0, 1, 0)));
vec3 lb = cross(lt, fw);
float v = 0.0;
for (int k = 0; k < 4; k++) {
float a = 6.2832 * fract(seed + float(k) * 0.618034);
float r = sqrt((float(k) + 0.5) / 4.0) * 0.85;
vec3 d = LPOS + (lt * cos(a) + lb * sin(a)) * r - P;
float occ = 0.0; float t; vec2 ab;
for (int i = 0; i < NP; i++) {
if (i == skip) continue;
if (hitPanel(i, P, d, t, ab) && t < 1.0) { occ = 1.0; break; }
}
v += 1.0 - occ;
}
return v / 4.0;
}
// What a mirror sees when it looks away from the wall: two softboxes behind and above the camera.
vec3 studio(vec3 ro, vec3 rd) {
vec3 c = vec3(0.012, 0.01, 0.01);
if (rd.z > 0.0) {
// tall strip lights either side of the camera: they only show in a print that is turned toward them
float side = smoothstep(0.5, 0.62, abs(rd.x)) * smoothstep(0.96, 0.86, abs(rd.x));
float high = smoothstep(0.215, 0.25, rd.y) * smoothstep(0.7, 0.5, rd.y);
c += vec3(1.0, 0.95, 0.9) * 2.4 * side * high;
}
if (rd.y > 1e-4) {
vec3 p = ro + rd * ((6.5 - ro.y) / rd.y);
float m = smoothstep(-2.6, -1.8, p.x) * smoothstep(2.6, 1.8, p.x) * smoothstep(0.5, 1.3, p.z) * smoothstep(5.0, 4.2, p.z);
c += vec3(1.0, 0.93, 0.86) * 3.0 * m;
}
return c;
}
// The back wall: charcoal plaster with one pool of light low behind the middle print.
vec3 wallCol(vec3 ro, vec3 rd, float lod) {
if (rd.z > -1e-4) return studio(ro, rd);
vec3 W = ro + rd * ((ZW - ro.z) / rd.z);
if (W.y < 0.0) return vec3(0.0);
vec3 l; vec3 key = keyAt(W, l);
float grain = 0.9 + 0.2 * fbm(W.xy * 3.0);
vec3 alb = vec3(0.026, 0.021, 0.022) * grain;
vec2 wq = (W.xy - vec2(-0.15, 0.7)) / vec2(2.5, 1.25);
float wash = exp(-pow(dot(wq, wq), 0.8) * 1.15);
vec3 c = alb * (key * max(l.z, 0.0) * 0.5 + vec3(1.0, 0.93, 0.88) * wash * 8.5 + 0.03);
c += vec3(1.0, 0.86, 0.78) * exp(-W.y / 0.05) * 0.1 * wash;
return c * smoothstep(8.0, 3.0, abs(W.x));
}
vec3 faceLight(int i, vec3 P) {
vec3 l; vec3 key = keyAt(P, l);
return (key * max(dot(cross(uPu[i], uPv[i]), l), 0.0) + vec3(0.07, 0.06, 0.06)) * uPk[i];
}
vec3 tonemap(vec3 x) { x *= 0.92; return clamp((x * (2.51 * x + 0.03)) / (x * (2.43 * x + 0.59) + 0.14), 0.0, 1.0); }
vec4 pack(vec3 col, float depth) {
float coc = clamp(uAperture * (1.0 - uFocus / max(depth, 0.05)), -1.0, 1.0);
return vec4(pow(tonemap(col), vec3(1.0 / 2.2)), 0.5 + 0.5 * coc);
}
`;
const VS_FULL = `#version 300 es
out vec2 vUv;
void main() { vec2 p = vec2(float((gl_VertexID << 1) & 2), float(gl_VertexID & 2)); vUv = p; gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0); }`;
const FS_SET = `${GLSL_HEAD}
in vec2 vUv;
out vec4 o;
void main() {
vec2 ndc = vUv * 2.0 - 1.0;
vec3 rd = normalize(uFw + uRt * (ndc.x * uTan * uAspect) + uUp * (ndc.y * uTan));
float seed = ign(gl_FragCoord.xy);
float tw = (ZW - uCam.z) / rd.z;
float tf = rd.y < -1e-4 ? -uCam.y / rd.y : 1e9;
if (tf > tw) { o = pack(wallCol(uCam, rd, 0.0), dot(rd, uFw) * tw); return; }
vec3 P = uCam + rd * tf;
// polished resin floor: dark, slightly wavy, with smudges that change how sharp the mirror is
float smudge = fbm(P.xz * 1.7 + 3.1);
float rough = 0.006 + 0.042 * smudge * smudge + 0.012 * vnoise(P.xz * vec2(3.0, 41.0));
vec2 wav = vec2(vnoise(P.xz * 2.3 + 11.0), vnoise(P.xz * 2.3 + 37.0)) - 0.5;
vec3 n = normalize(vec3(wav.x * 0.012, 1.0, wav.y * 0.012));
// the brass rail the prints ride on, inlaid flush
float rr = abs(length(P.xz - vec2(0.0, -${RING})) - ${RING});
float rr2 = abs(length(P.xz - vec2(0.0, -${RING})) - ${RING + 0.92});
float rail = max(smoothstep(0.011, 0.007, rr), smoothstep(0.011, 0.007, rr2));
rough = mix(rough, 0.03, rail);
// glossy reflection: a handful of rays through the rough mirror, each one finding a print, the wall or the softboxes
vec3 refl = vec3(0.0);
float far = 0.0;
for (int k = 0; k < 6; k++) {
float a = 6.2832 * fract(seed + float(k) * 0.618034);
float r = sqrt((float(k) + 0.5) / 6.0);
vec3 nn = normalize(n + vec3(cos(a), 0.0, sin(a)) * r * rough);
vec3 R = reflect(rd, nn);
float best = 1e9; int bi = -1; vec2 bab = vec2(0.0); float t; vec2 ab;
for (int i = 0; i < NP; i++) if (hitPanel(i, P, R, t, ab) && t < best) { best = t; bi = i; bab = ab; }
if (bi >= 0) {
float lod = log2(1.0 + best * rough * 260.0);
vec3 alb = textureLod(uTex, vec3(bab / HS * 0.5 + 0.5, uPl[bi]), lod).rgb;
refl += alb * faceLight(bi, P + R * best);
far += best;
} else { refl += wallCol(P, R, 1.0 + rough * 60.0); far += (ZW - P.z) / min(R.z, -0.05); }
}
refl /= 6.0;
far /= 6.0;
// light on the floor itself: the key with soft shadows, plus colour bounced off the nearest prints
vec3 l; vec3 key = keyAt(P, l);
vec3 dif = key * max(l.y, 0.0) * keyVis(P + vec3(0.0, 0.002, 0.0), -1, seed);
float ao = 1.0;
for (int i = 0; i < NP; i++) {
vec3 np = cross(uPu[i], uPv[i]);
vec3 q = uPc[i] - uPv[i] * (HS.y * 0.45);
vec3 d = P - q; float r2 = dot(d, d); vec3 dn = d * inversesqrt(r2);
float ff = abs(dot(np, dn)) * max(-dn.y, 0.0) / (0.35 + r2);
vec3 bounce = textureLod(uTex, vec3(0.5, 0.3, uPl[i]), 7.0).rgb;
dif += bounce * faceLight(i, q) * ff * (dot(np, dn) > 0.0 ? 1.5 : 0.25);
vec3 b0 = uPc[i] - uPv[i] * HS.y;
float h = clamp(dot(P - b0, uPu[i]), -HS.x, HS.x);
float dl = length(P - (b0 + uPu[i] * h));
ao *= 1.0 - 0.8 * exp(-dl / 0.05);
}
vec3 alb = mix(vec3(0.07, 0.05, 0.05), vec3(0.5, 0.33, 0.14), rail);
float F0 = mix(0.11, 0.75, rail);
float F = F0 + (1.0 - F0) * pow(1.0 - clamp(dot(-rd, n), 0.0, 1.0), 5.0);
vec3 col = alb * dif * ao * (1.0 - F) + refl * mix(vec3(1.0), vec3(1.0, 0.78, 0.42), rail) * F * (0.55 + 0.45 * ao);
// a mirror image focuses at the distance of the thing mirrored, not of the glass
float mirror = clamp(F * 2.2, 0.0, 1.0) * (1.0 - smoothstep(0.02, 0.07, rough));
o = pack(col, dot(rd, uFw) * (tf + far * mirror));
}`;
const VS_PRINT = `#version 300 es
precision highp float;
layout(location = 0) in vec3 aPos;
layout(location = 1) in vec3 aNor;
uniform vec3 uC, uU, uV, uCam, uRt, uUp, uFw;
uniform float uTan, uAspect;
out vec3 vW; out vec3 vL; out vec3 vN;
void main() {
vec3 n = cross(uU, uV);
vW = uC + uU * aPos.x + uV * aPos.y + n * aPos.z;
vL = aPos; vN = aNor;
vec3 d = vW - uCam;
float z = dot(d, uFw);
gl_Position = vec4(dot(d, uRt) / (uTan * uAspect), dot(d, uUp) / uTan, (z * 60.1 - 12.0) / 59.9, z);
}`;
const FS_PRINT = `${GLSL_HEAD}
uniform vec3 uC, uU, uV;
uniform int uIdx;
in vec3 vW; in vec3 vL; in vec3 vN;
out vec4 o;
void main() {
vec3 pn = cross(uU, uV);
vec3 N = normalize(uU * vN.x + uV * vN.y + pn * vN.z);
vec3 V = normalize(uCam - vW);
float seed = ign(gl_FragCoord.xy);
vec3 l; vec3 key = keyAt(vW, l);
float vis = keyVis(vW + N * 0.004, uIdx, seed);
float gain = uPk[uIdx];
vec3 col;
if (vN.z > 0.5) {
// the photograph under a gloss laminate
vec2 uv = vL.xy / HS * 0.5 + 0.5;
vec3 alb = texture(uTex, vec3(uv, uPl[uIdx])).rgb;
alb = pow(alb, vec3(1.06)) * 1.04;
float foot = smoothstep(0.0, 0.5, vW.y);
col = alb * (key * max(dot(N, l), 0.0) * (0.25 + 0.75 * vis) + vec3(0.07, 0.06, 0.06)) * (0.84 + 0.16 * foot);
float F = 0.04 + 0.96 * pow(1.0 - max(dot(N, V), 0.0), 5.0);
vec3 wob = vec3(vnoise(vL.xy * 5.0), vnoise(vL.xy * 5.0 + 9.0), 0.0) - 0.5;
col += studio(vW, reflect(-V, normalize(N + (uU * wob.x + uV * wob.y) * 0.02))) * F;
float e = min(HS.x - abs(vL.x), HS.y - abs(vL.y));
col += vec3(1.0, 0.96, 0.9) * smoothstep(0.006, 0.0, e) * (0.1 + 0.5 * max(dot(N, l), 0.0)) * key * 0.22;
} else if (vN.z < -0.5) {
col = vec3(0.02, 0.018, 0.018) * (key * max(dot(N, l), 0.0) * vis + 0.3);
} else {
// the edge: a milled aluminium core that catches the softboxes
float brush = 0.8 + 0.4 * vnoise(vec2(vL.z * 900.0, (vL.x + vL.y) * 6.0));
vec3 R = reflect(-V, N);
col = vec3(0.78, 0.76, 0.74) * brush * (studio(vW, R) * 0.6 + wallCol(vW, R, 4.0) * 0.5 + key * max(dot(N, l), 0.0) * vis * 0.16 + 0.03);
}
o = pack(col * gain, dot(vW - uCam, uFw));
}`;
const FS_LENS = `#version 300 es
precision highp float;
uniform sampler2D uScene;
uniform vec2 uPx;
uniform float uMaxR;
in vec2 vUv;
out vec4 o;
float ign(vec2 p) { return fract(52.9829189 * fract(dot(p, vec2(0.06711056, 0.00583715)))); }
void main() {
vec4 c0 = texture(uScene, vUv);
float coc0 = abs(c0.a * 2.0 - 1.0);
vec3 lin0 = pow(c0.rgb, vec3(2.2));
float w0 = 1.0 / (1.03 - max(lin0.r, max(lin0.g, lin0.b)));
vec3 acc = lin0 * w0; float wsum = w0; float spread = coc0;
float rot = 6.2832 * ign(gl_FragCoord.xy);
// 40 taps over the whole blur disc, then 14 more packed into the middle so slightly soft edges stay clean
for (int k = 1; k < 54; k++) {
float r = k < 40 ? sqrt(float(k) / 40.0) * uMaxR : sqrt(float(k - 39) / 14.0) * min(uMaxR, 3.2);
float a = float(k) * 2.39996 + rot;
vec4 s = texture(uScene, vUv + vec2(cos(a), sin(a)) * r * uPx);
float sc = s.a * 2.0 - 1.0;
float cs = abs(sc);
if (sc > c0.a * 2.0 - 1.0) cs = min(cs, coc0 * 1.6 + 0.02);
vec3 lin = pow(s.rgb, vec3(2.2));
float w = smoothstep(r - 1.0, r + 1.0, cs * uMaxR) / (1.03 - max(lin.r, max(lin.g, lin.b)));
acc += lin * w; wsum += w; spread = max(spread, cs * step(0.5, w * 0.03 + smoothstep(r - 1.0, r + 1.0, cs * uMaxR)));
}
o = vec4(pow(acc / wsum, vec3(1.0 / 2.2)), spread);
}`;
const FS_PRINTOUT = `#version 300 es
precision highp float;
uniform sampler2D uScene;
uniform vec2 uPx;
uniform float uTime;
in vec2 vUv;
out vec4 o;
float ign(vec2 p) { return fract(52.9829189 * fract(dot(p, vec2(0.06711056, 0.00583715)))); }
void main() {
// tidy the blur where the lens pass was sparse, then vignette and film grain
vec4 c = texture(uScene, vUv);
float r = clamp(c.a * 4.0, 0.0, 1.0) * 1.5;
vec3 col = c.rgb * 4.0;
for (int k = 0; k < 8; k++) {
float a = float(k) * 0.7854;
col += texture(uScene, vUv + vec2(cos(a), sin(a)) * r * (k % 2 == 0 ? 1.0 : 1.9) * uPx).rgb;
}
col /= 12.0;
vec2 q = vUv - 0.5;
col *= 1.0 - 0.9 * dot(q, q);
col += (ign(gl_FragCoord.xy + fract(uTime) * 61.0) - 0.5) * 0.026;
o = vec4(col, 1.0);
}`;
function program(gl: WebGL2RenderingContext, vs: string, fs: string) {
const p = gl.createProgram()!;
for (const [type, src] of [[gl.VERTEX_SHADER, vs], [gl.FRAGMENT_SHADER, fs]] as const) {
const s = gl.createShader(type)!;
gl.shaderSource(s, src);
gl.compileShader(s);
if (!gl.getShaderParameter(s, gl.COMPILE_STATUS)) throw new Error(gl.getShaderInfoLog(s) || "shader");
gl.attachShader(p, s);
}
gl.linkProgram(p);
if (!gl.getProgramParameter(p, gl.LINK_STATUS)) throw new Error(gl.getProgramInfoLog(p) || "link");
return p;
}
/** A thin box: 36 vertices of position + normal, in print-local units. */
function boxMesh() {
const T = 0.016;
const faces: [number[], number[], number[]][] = [
[[0, 0, 1], [1, 0, 0], [0, 1, 0]],
[[0, 0, -1], [-1, 0, 0], [0, 1, 0]],
[[1, 0, 0], [0, 0, -1], [0, 1, 0]],
[[-1, 0, 0], [0, 0, 1], [0, 1, 0]],
[[0, 1, 0], [1, 0, 0], [0, 0, -1]],
[[0, -1, 0], [1, 0, 0], [0, 0, 1]],
];
const half = [HX, HY, T];
const out: number[] = [];
for (const [n, a, b] of faces) {
for (const [s, t] of [[-1, -1], [1, -1], [1, 1], [-1, -1], [1, 1], [-1, 1]]) {
for (let c = 0; c < 3; c++) out.push((n[c] + a[c] * s + b[c] * t) * half[c]);
out.push(n[0], n[1], n[2]);
}
}
return new Float32Array(out);
}
/** Crop a photo to the print's shape around its focus point. */
function coverDraw(ctx: CanvasRenderingContext2D, img: HTMLImageElement, focus: number[]) {
const s = Math.max(TEX_W / img.naturalWidth, TEX_H / img.naturalHeight);
const w = img.naturalWidth * s;
const h = img.naturalHeight * s;
ctx.drawImage(img, clamp(TEX_W / 2 - focus[0] * w, TEX_W - w, 0), clamp(TEX_H / 2 - focus[1] * h, TEX_H - h, 0), w, h);
}
type Sim = {
pos: number; vel: number; goal: number; acc: number; accF: number;
rock: Float32Array; rockV: Float32Array; hist: Float32Array; histAt: number;
dragging: boolean; lastX: number; lastT: number; paused: boolean; nextAuto: number;
px: number; py: number; cx: number; cy: number; pull: number; focus: number; active: number; dirty: boolean;
};
export default function StandingPrintCarousel() {
const reduce = useReducedMotion();
const wrapRef = useRef<HTMLDivElement>(null);
const canvasRef = useRef<HTMLCanvasElement>(null);
const [active, setActive] = useState(0);
const [mode, setMode] = useState<"pending" | "gl" | "still">("pending");
const sim = useRef<Sim>({
pos: 0, vel: 0, goal: 0, acc: 0, accF: 0,
rock: new Float32Array(N), rockV: new Float32Array(N), hist: new Float32Array(64), histAt: 0,
dragging: false, lastX: 0, lastT: 0, paused: false, nextAuto: 0,
px: 0, py: 0, cx: 0, cy: 0, pull: 0, focus: 5, active: 0, dirty: true,
});
const step = useCallback((dir: number) => {
const s = sim.current;
s.goal = Math.round(s.goal) + dir;
s.nextAuto = performance.now() + HOLD_MS * 2;
s.dirty = true;
if (mode === "still") setActive(mod(s.goal, N));
}, [mode]);
useEffect(() => {
const wrap = wrapRef.current;
const canvas = canvasRef.current;
if (!wrap || !canvas) return;
const gl = canvas.getContext("webgl2", { antialias: false, alpha: false, powerPreference: "high-performance" });
if (!gl) {
setMode("still");
return;
}
const s = sim.current;
let progSet: WebGLProgram, progPrint: WebGLProgram, progLens: WebGLProgram, progOut: WebGLProgram;
try {
progSet = program(gl, VS_FULL, FS_SET);
progPrint = program(gl, VS_PRINT, FS_PRINT);
progLens = program(gl, VS_FULL, FS_LENS);
progOut = program(gl, VS_FULL, FS_PRINTOUT);
} catch {
setMode("still");
return;
}
setMode("gl");
// the photographs, one layer each of an sRGB array texture so the light maths is linear
const tex = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D_ARRAY, tex);
gl.texStorage3D(gl.TEXTURE_2D_ARRAY, Math.floor(Math.log2(TEX_H)) + 1, gl.SRGB8_ALPHA8, TEX_W, TEX_H, N);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
const aniso = gl.getExtension("EXT_texture_filter_anisotropic");
if (aniso) gl.texParameterf(gl.TEXTURE_2D_ARRAY, aniso.TEXTURE_MAX_ANISOTROPY_EXT, 8);
const scratch = document.createElement("canvas");
scratch.width = TEX_W;
scratch.height = TEX_H;
const sctx = scratch.getContext("2d")!;
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
const upload = (layer: number) => {
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D_ARRAY, tex);
gl.texSubImage3D(gl.TEXTURE_2D_ARRAY, 0, 0, 0, layer, TEX_W, TEX_H, 1, gl.RGBA, gl.UNSIGNED_BYTE, scratch);
gl.generateMipmap(gl.TEXTURE_2D_ARRAY);
s.dirty = true;
};
let alive = true;
plates.forEach((p, i) => {
const g = sctx.createLinearGradient(0, 0, 0, TEX_H);
g.addColorStop(0, p.tone);
g.addColorStop(1, "#150406");
sctx.fillStyle = g;
sctx.fillRect(0, 0, TEX_W, TEX_H);
upload(i);
const img = new Image();
img.crossOrigin = "anonymous";
img.onload = () => {
if (!alive) return;
coverDraw(sctx, img, p.focus);
upload(i);
};
img.src = p.src;
});
const vao = gl.createVertexArray();
gl.bindVertexArray(vao);
const vbo = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vbo);
gl.bufferData(gl.ARRAY_BUFFER, boxMesh(), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 24, 0);
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 3, gl.FLOAT, false, 24, 12);
gl.bindVertexArray(null);
const emptyVao = gl.createVertexArray();
// multisampled scene target, resolved into a texture the lens pass reads (colour + blur size in alpha)
const msFbo = gl.createFramebuffer();
const msColor = gl.createRenderbuffer();
const msDepth = gl.createRenderbuffer();
const resFbo = gl.createFramebuffer();
const resTex = gl.createTexture();
const lensFbo = gl.createFramebuffer();
const lensTex = gl.createTexture();
let W = 0, H = 0, scale = Math.min(window.devicePixelRatio || 1, 1.5);
const samples = Math.min(4, gl.getParameter(gl.MAX_SAMPLES));
const resize = () => {
const cw = wrap.clientWidth, ch = wrap.clientHeight;
let k = scale;
if (cw * ch * k * k > 1.5e6) k = Math.sqrt(1.5e6 / (cw * ch));
const w = Math.max(2, Math.round(cw * k)), h = Math.max(2, Math.round(ch * k));
if (w === W && h === H) return;
W = w;
H = h;
canvas.width = W;
canvas.height = H;
gl.bindRenderbuffer(gl.RENDERBUFFER, msColor);
gl.renderbufferStorageMultisample(gl.RENDERBUFFER, samples, gl.RGBA8, W, H);
gl.bindRenderbuffer(gl.RENDERBUFFER, msDepth);
gl.renderbufferStorageMultisample(gl.RENDERBUFFER, samples, gl.DEPTH_COMPONENT16, W, H);
gl.bindFramebuffer(gl.FRAMEBUFFER, msFbo);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, msColor);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, msDepth);
for (const [unit, t, f] of [[gl.TEXTURE2, resTex, resFbo], [gl.TEXTURE3, lensTex, lensFbo]] as const) {
gl.activeTexture(unit);
gl.bindTexture(gl.TEXTURE_2D, t);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA8, W, H, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.bindFramebuffer(gl.FRAMEBUFFER, f);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t, 0);
}
s.dirty = true;
};
resize();
const ro = new ResizeObserver(resize);
ro.observe(wrap);
const U = (p: WebGLProgram, n: string) => gl.getUniformLocation(p, n);
const pc = new Float32Array(21), pu = new Float32Array(21), pv = new Float32Array(21), pl = new Float32Array(7), pk = new Float32Array(7);
const TAN = Math.tan((19 * Math.PI) / 180);
const shared = (p: WebGLProgram, cam: number[], rt: number[], up: number[], fw: number[], t: number) => {
gl.useProgram(p);
gl.uniform3fv(U(p, "uPc"), pc);
gl.uniform3fv(U(p, "uPu"), pu);
gl.uniform3fv(U(p, "uPv"), pv);
gl.uniform1fv(U(p, "uPl"), pl);
gl.uniform1fv(U(p, "uPk"), pk);
gl.uniform1i(U(p, "uTex"), 0);
gl.uniform3fv(U(p, "uCam"), cam);
gl.uniform3fv(U(p, "uRt"), rt);
gl.uniform3fv(U(p, "uUp"), up);
gl.uniform3fv(U(p, "uFw"), fw);
gl.uniform1f(U(p, "uTan"), TAN);
gl.uniform1f(U(p, "uAspect"), W / H);
gl.uniform1f(U(p, "uFocus"), s.focus);
gl.uniform1f(U(p, "uAperture"), 1.35);
gl.uniform1f(U(p, "uTime"), t);
};
const draw = (t: number) => {
// where every print stands this frame
const base = Math.round(s.pos) - 3;
let hero = 0;
for (let i = 0; i < 7; i++) {
const k = base + i;
const u = k - s.pos;
const layer = mod(k, N);
const ang = u * STEP;
const lift = 0.42 * Math.exp(-u * u * 2.2);
if (Math.abs(u) <= 0.5) hero = lift;
const bx = RING * Math.sin(ang), bz = -RING * (1 - Math.cos(ang)) + lift;
const yaw = ang * 0.92;
const ux = Math.cos(yaw), uz = -Math.sin(yaw);
const th = s.rock[layer];
const c = Math.cos(th), sn = Math.sin(th);
// rotate in the print's own plane about whichever bottom corner is on the floor
const rux = ux * c, ruy = -sn, ruz = uz * c;
const rvx = ux * sn, rvy = c, rvz = uz * sn;
const side = th >= 0 ? 1 : -1;
const pxv = bx + ux * HX * side, pzv = bz + uz * HX * side;
pc[i * 3] = pxv - rux * HX * side + rvx * HY;
pc[i * 3 + 1] = -ruy * HX * side + rvy * HY + 0.0015;
pc[i * 3 + 2] = pzv - ruz * HX * side + rvz * HY;
pu.set([rux, ruy, ruz], i * 3);
pv.set([rvx, rvy, rvz], i * 3);
pl[i] = layer;
pk[i] = clamp((3.4 - Math.abs(u)) / 0.9, 0, 1);
}
// camera: low, drifting a little, leaning with the pointer
const aspect = W / H;
const camZ = Math.max(3.78, 0.42 + 0.74 / (TAN * aspect)) + s.pull;
const drift = reduce ? 0 : 1;
const cam = [-0.46 + s.cx * 0.7 + drift * 0.12 * Math.sin(t * 0.31), 0.46 - s.cy * 0.16 + drift * 0.03 * Math.sin(t * 0.23 + 1), camZ];
const tx = 0, ty = 0.71, tz = 0;
let fw = [tx - cam[0], ty - cam[1], tz - cam[2]];
const fl = Math.hypot(fw[0], fw[1], fw[2]);
fw = fw.map((v) => v / fl);
let rt = [-fw[2], 0, fw[0]];
const rl = Math.hypot(rt[0], rt[2]);
rt = rt.map((v) => v / rl);
const up = [rt[1] * fw[2] - rt[2] * fw[1], rt[2] * fw[0] - rt[0] * fw[2], rt[0] * fw[1] - rt[1] * fw[0]];
const want = (hero - cam[2]) * fw[2] + (0.75 - cam[1]) * fw[1] + (0 - cam[0]) * fw[0];
s.focus = reduce ? want : s.focus + (want - s.focus) * 0.09;
gl.bindFramebuffer(gl.FRAMEBUFFER, msFbo);
gl.viewport(0, 0, W, H);
gl.disable(gl.DEPTH_TEST);
gl.depthMask(false);
shared(progSet, cam, rt, up, fw, t);
gl.bindVertexArray(emptyVao);
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.enable(gl.DEPTH_TEST);
gl.depthMask(true);
gl.clear(gl.DEPTH_BUFFER_BIT);
shared(progPrint, cam, rt, up, fw, t);
gl.bindVertexArray(vao);
for (let i = 0; i < 7; i++) {
if (pk[i] <= 0) continue;
gl.uniform3f(U(progPrint, "uC"), pc[i * 3], pc[i * 3 + 1], pc[i * 3 + 2]);
gl.uniform3f(U(progPrint, "uU"), pu[i * 3], pu[i * 3 + 1], pu[i * 3 + 2]);
gl.uniform3f(U(progPrint, "uV"), pv[i * 3], pv[i * 3 + 1], pv[i * 3 + 2]);
gl.uniform1i(U(progPrint, "uIdx"), i);
gl.drawArrays(gl.TRIANGLES, 0, 36);
}
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, msFbo);
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, resFbo);
gl.blitFramebuffer(0, 0, W, H, 0, 0, W, H, gl.COLOR_BUFFER_BIT, gl.NEAREST);
gl.bindFramebuffer(gl.FRAMEBUFFER, lensFbo);
gl.disable(gl.DEPTH_TEST);
gl.useProgram(progLens);
gl.uniform1i(U(progLens, "uScene"), 2);
gl.uniform2f(U(progLens, "uPx"), 1 / W, 1 / H);
gl.uniform1f(U(progLens, "uMaxR"), H * 0.012);
gl.bindVertexArray(emptyVao);
gl.drawArrays(gl.TRIANGLES, 0, 3);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.useProgram(progOut);
gl.uniform1i(U(progOut, "uScene"), 3);
gl.uniform2f(U(progOut, "uPx"), 1 / W, 1 / H);
gl.uniform1f(U(progOut, "uTime"), reduce ? 0 : t);
gl.drawArrays(gl.TRIANGLES, 0, 3);
};
/** One small step of the carriage and of every print rocking on its corners. */
const physics = (dt: number) => {
if (!s.dragging) {
s.acc = SPRING * (s.goal - s.pos) - DAMPING * s.vel;
s.vel += s.acc * dt;
s.pos += s.vel * dt;
} else s.acc *= Math.exp(-dt * 14);
s.accF += (s.acc - s.accF) * Math.min(1, dt / 0.08);
s.histAt = (s.histAt + 1) & 63;
s.hist[s.histAt] = s.accF;
for (let j = 0; j < N; j++) {
// prints further from the middle hear about the shove a moment later, so the rocking travels outward
let u = mod(j - s.pos + N / 2, N) - N / 2;
u = Math.min(Math.abs(u), 3);
const a = clamp(s.hist[(s.histAt - Math.round(u * 14) + 64) & 63] * ROCK_GAIN, -1.5, 1.5);
let th = s.rock[j], om = s.rockV[j];
if (th === 0 && om === 0) {
if (Math.abs(a) > Math.tan(ALPHA)) om = -Math.sign(a) * 1e-4;
else continue;
}
const sg = th > 0 || (th === 0 && om > 0) ? 1 : -1;
const lean = ALPHA - sg * th;
om += P2 * (-sg * Math.sin(lean) - a * Math.cos(lean)) * dt;
om -= om * 0.25 * dt;
let nx = th + om * dt;
if (Math.abs(nx) > ALPHA * 0.34) {
nx = Math.sign(nx) * ALPHA * 0.34;
om *= -0.2;
}
if (th !== 0 && nx * th <= 0) {
// the lifted corner lands: lose energy, and either pivot onto the other corner or stay down
om *= 0.82;
nx = 0;
if (Math.abs(om) < 0.1 && Math.abs(a) < Math.tan(ALPHA)) om = 0;
}
s.rock[j] = nx;
s.rockV[j] = om;
}
};
let raf = 0, visible = true, last = performance.now(), slow = 0, frames = 0;
s.nextAuto = last + HOLD_MS;
const tick = (now: number) => {
const real = now - last;
const dt = Math.min(0.05, real / 1000);
last = now;
if (reduce) {
if (s.pos !== s.goal) s.dirty = true;
s.pos = s.goal;
s.vel = 0;
} else {
const sub = Math.max(1, Math.ceil(dt / 0.004));
for (let i = 0; i < sub; i++) physics(dt / sub);
s.cx += (s.px - s.cx) * Math.min(1, dt * 3.2);
s.cy += (s.py - s.cy) * Math.min(1, dt * 3.2);
s.pull += (0.11 * Math.min(Math.abs(s.vel), 4) - s.pull) * Math.min(1, dt * 4);
if (!s.paused && !s.dragging && !document.hidden && now > s.nextAuto) {
s.goal = Math.round(s.goal) + 1;
s.nextAuto = now + HOLD_MS;
}
}
const a = mod(Math.round(s.pos), N);
if (a !== s.active) {
s.active = a;
setActive(a);
}
if (!reduce || s.dirty) {
draw(now / 1000);
s.dirty = false;
// measure, do not guess: if the machine cannot hold the frame rate, render fewer pixels
if (!reduce && ++frames > 20) {
slow = slow * 0.92 + (real > 24 ? 1 : 0) * 0.08;
if (slow > 0.6 && scale > 0.5) {
scale *= 0.85;
slow = 0;
frames = 0;
resize();
}
}
}
if (visible) raf = requestAnimationFrame(tick);
};
const io = new IntersectionObserver(([e]) => {
const was = visible;
visible = e.isIntersecting;
if (visible && !was) {
last = performance.now();
frames = 0;
raf = requestAnimationFrame(tick);
}
});
io.observe(wrap);
raf = requestAnimationFrame(tick);
const down = (e: PointerEvent) => {
if (e.button !== 0) return;
s.dragging = true;
s.lastX = e.clientX;
s.lastT = performance.now();
s.vel = 0;
canvas.setPointerCapture(e.pointerId);
};
const move = (e: PointerEvent) => {
const r = wrap.getBoundingClientRect();
s.px = clamp(((e.clientX - r.left) / r.width) * 2 - 1, -1, 1);
s.py = clamp(((e.clientY - r.top) / r.height) * 2 - 1, -1, 1);
if (!s.dragging) return;
const now = performance.now();
const dn = -(e.clientX - s.lastX) / (r.height * 0.46);
const dt = Math.max(4, now - s.lastT) / 1000;
const v = dn / dt;
s.acc = clamp((v - s.vel) / dt, -60, 60);
s.vel = s.vel * 0.5 + v * 0.5;
s.pos += dn;
s.lastX = e.clientX;
s.lastT = now;
s.dirty = true;
};
const up = () => {
if (!s.dragging) return;
s.dragging = false;
s.vel = clamp(s.vel, -9, 9);
s.goal = Math.round(s.pos + s.vel * 0.22);
s.nextAuto = performance.now() + HOLD_MS * 2;
};
const leave = () => {
s.px = 0;
s.py = 0;
};
canvas.addEventListener("pointerdown", down);
wrap.addEventListener("pointermove", move);
canvas.addEventListener("pointerup", up);
canvas.addEventListener("pointercancel", up);
wrap.addEventListener("pointerleave", leave);
return () => {
alive = false;
cancelAnimationFrame(raf);
ro.disconnect();
io.disconnect();
canvas.removeEventListener("pointerdown", down);
wrap.removeEventListener("pointermove", move);
canvas.removeEventListener("pointerup", up);
canvas.removeEventListener("pointercancel", up);
wrap.removeEventListener("pointerleave", leave);
gl.getExtension("WEBGL_lose_context")?.loseContext();
};
}, [reduce]);
const onKey = (e: React.KeyboardEvent) => {
if (e.key === "ArrowRight" || e.key === "ArrowDown") {
e.preventDefault();
step(1);
} else if (e.key === "ArrowLeft" || e.key === "ArrowUp") {
e.preventDefault();
step(-1);
}
};
const pause = (v: boolean) => () => {
sim.current.paused = v;
if (!v) sim.current.nextAuto = performance.now() + HOLD_MS;
};
const btn = "grid h-11 w-11 place-items-center rounded-full border border-white/20 bg-black/30 text-white backdrop-blur-sm transition hover:bg-white/15 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-white";
return (
<section className="relative overflow-hidden bg-[#0b0405]" onFocus={pause(true)} onBlur={pause(false)}>
<div
ref={wrapRef}
role="group"
aria-roledescription="carousel"
aria-label="Seven fashion prints standing on a mirror floor. Use the left and right arrow keys to bring the next print forward."
tabIndex={0}
onKeyDown={onKey}
className="relative h-[600px] w-full select-none outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-white/70 sm:h-[780px]"
>
<canvas ref={canvasRef} aria-hidden="true" className={`absolute inset-0 h-full w-full cursor-grab touch-pan-y active:cursor-grabbing ${mode === "still" ? "hidden" : ""}`} />
{/* the same set built from plain images, for browsers without WebGL 2 */}
{mode === "still" && (
<div className="absolute inset-0 overflow-hidden" style={{ background: "radial-gradient(60% 46% at 50% 62%, #5a5050 0%, #2a2525 45%, #0b0a0a 100%)" }}>
<style>{`@keyframes standing-print-carousel-drift { from { transform: translateX(-10px); } to { transform: translateX(10px); } } .standing-print-carousel-drift { animation: standing-print-carousel-drift 7s ease-in-out infinite alternate; } @media (prefers-reduced-motion: reduce) { .standing-print-carousel-drift { animation: none; } }`}</style>
<div className="absolute inset-x-0 bottom-0 top-[76%]" style={{ background: "linear-gradient(180deg, #171313 0%, #0b0a0a 100%)" }} />
<div className="standing-print-carousel-drift absolute left-1/2 top-[15%] h-[61%]" style={{ perspective: "1400px" }}>
{[-2, -1, 1, 2, 0].map((u) => {
const p = plates[mod(active + u, N)];
const x = u * 88 - 50;
const tf = `translateX(${x}%) translateZ(${-Math.abs(u) * 130}px) rotateY(${u * 20}deg)`;
return (
<div key={mod(active + u, N)} className="absolute left-0 top-0 h-full transition-transform duration-700 ease-out motion-reduce:transition-none" style={{ aspectRatio: "1060 / 1500", transform: tf, transformStyle: "preserve-3d", filter: u ? `blur(${Math.abs(u) * 2.5}px) brightness(${1 - Math.abs(u) * 0.28})` : undefined }}>
<img src={p.src} alt={u === 0 ? p.alt : ""} width={900} height={1274} className="h-full w-full object-cover shadow-[0_0_0_1px_rgba(255,255,255,0.12)]" style={{ background: p.tone, objectPosition: `${p.focus[0] * 100}% ${p.focus[1] * 100}%` }} />
<div aria-hidden="true" className="absolute left-0 top-full h-full w-full" style={{ transform: "scaleY(-1)", backgroundImage: `url("${p.src}")`, backgroundSize: "cover", backgroundPosition: `${p.focus[0] * 100}% ${p.focus[1] * 100}%`, backgroundColor: p.tone, opacity: 0.42, filter: "blur(3px)", maskImage: "linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0) 62%)", WebkitMaskImage: "linear-gradient(0deg, rgba(0,0,0,0.9), rgba(0,0,0,0) 62%)" }} />
</div>
);
})}
</div>
</div>
)}
<div className="pointer-events-none absolute inset-x-0 top-0 flex items-baseline justify-between p-5 text-white sm:p-9">
<p className="text-[26px] italic leading-none sm:text-[30px]" style={{ fontFamily: SERIF, letterSpacing: "-0.03em" }}>
{MASTHEAD}
</p>
<p className="text-[10px] font-medium uppercase tracking-[0.28em] text-white/60 sm:text-[11px]" style={{ fontFamily: GROTESK }}>
Drag<span className="hidden sm:inline">, or use the arrow keys</span>
</p>
</div>
<div className="pointer-events-none absolute inset-x-0 bottom-0 flex items-end justify-between gap-4 p-5 sm:p-9">
<p aria-live="polite" className="text-white">
<span className="block text-[11px] font-medium uppercase tracking-[0.28em] text-white/70" style={{ fontFamily: GROTESK }}>
<span className="tabular-nums text-white">{String(active + 1).padStart(2, "0")}</span>
<span className="mx-2 text-white/40">/</span>
<span className="tabular-nums">{String(N).padStart(2, "0")}</span>
<span className="ml-4 hidden sm:inline">Autumn portfolio</span>
</span>
<span className="mt-2 block text-[38px] italic leading-[0.92] sm:text-[76px]" style={{ fontFamily: SERIF, letterSpacing: "-0.035em" }}>
{plates[active].title}
</span>
<span className="sr-only">. {plates[active].alt}</span>
</p>
<div className="pointer-events-auto flex gap-2">
<button type="button" onClick={() => step(-1)} aria-label="Previous print" className={btn}>
<svg aria-hidden="true" width="18" height="18" viewBox="0 0 20 20" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
<path d="M12 4l-6 6 6 6" />
</svg>
</button>
<button type="button" onClick={() => step(1)} aria-label="Next print" className={btn}>
<svg aria-hidden="true" width="18" height="18" viewBox="0 0 20 20" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
<path d="M8 4l6 6-6 6" />
</svg>
</button>
</div>
</div>
</div>
</section>
);
}
Install with one command: npx shadcn@latest add https://we.inc/r/fashion-print-carousel-in-webgl-with-standing-prints-that-rock-on-their-corners-over-a-mirror-floor.json
The floor is not a flipped copy of the scene. For every floor pixel the fragment shader sends eight rays off a slightly rough mirror and tests each one against the seven prints as flat rectangles, then against the wall. A hit reads the photograph at a blur level that depends on distance and roughness, which is why the reflection is crisp at the foot of a print and smears further away.
A rigid slab on a floor cannot bend, so when it is pushed sideways it pivots on one bottom corner. When it falls back, that corner lands, some energy is lost and it pivots onto the other corner. The `physics` function integrates exactly that, with the carriage acceleration as the push, which gives the quickening rattle you see as a print settles.
No. It uses the browser's WebGL 2 API directly: three small shader programs, one array texture holding the photographs, one box mesh and a multisampled framebuffer. Everything is created and released inside a single `useEffect`.
Device pixel ratio is capped at 1.5 and the canvas at about 1.5 million pixels. The loop times its own frames and, if too many run long, lowers the render scale in steps. Drawing stops when the section scrolls out of view.
The component switches to a still version made from ordinary images with CSS perspective, a faded mirrored copy under each one and the same wordmark and captions. The buttons and arrow keys still change the middle print.
The prints are portrait slabs, so landscape images are cropped hard around their `focus` point. To change the shape, edit `HX`, `HY`, `TEX_W` and `TEX_H` together so the texture keeps the same proportions as the print.
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