Files
hyperframes/docs/catalog/components/light-sweep-pass.mdx
miga-heygenandMiguel Ángel 7b5fdb1ad2 fix(docs): emit catalog source accordion titles as plain strings (#4006)
The generated catalog pages rendered the "Source" accordion title as a
JSX expression, `<Accordion title={`name.html`}>`. Mintlify's search
indexer stringifies expression attribute nodes rather than evaluating
them, so every one of the 399 catalog pages surfaced its Source section
in search results as "[object Object]" (visible on the Scroll Feed page,
among others).

The template literal carried no escaping benefit: every title is a
single-segment `name.html` path, and a double-quoted JSX string handles
it directly. Introduce `mdxStringAttribute`, which emits a plain
`name="value"` attribute and escapes `& " < { }` as HTML character
references (MDX decodes references inside quoted attribute values, and
unlike JSON.stringify it does not rely on backslash escapes, which JSX
strings do not honour). Use it for both the Source accordion title and
the preview iframe title, and regenerate the catalog pages.

Regenerated with `npx tsx scripts/generate-catalog-pages.ts`; the only
change across the 399 pages is the one Accordion title line each.

Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
2026-09-16 11:55:00 -04:00

1030 lines
42 KiB
Plaintext

---
title: "Light Sweep Pass"
description: "A traveling key light re-shades a slotted scene: a soft diagonal gradient band crosses the frame once while every per-element highlight and shadow shifts in lockstep (all driven by one --light-x property), then the light settles into a resting key. Quiet, expensive-feeling; the scene itself never moves. Callers fill the named scene slot; a token hero-and-cards default renders when it is left empty."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
## Install
<InstallCommand command="npx hyperframes add light-sweep-pass" item="light-sweep-pass" />
That writes one file: `compositions/components/light-sweep-pass.html`.
<VariablesExplorer
previewSrc="/public/catalog/components/light-sweep-pass.json"
compositionId="light-sweep-pass"
compositionSrc="compositions/components/light-sweep-pass.html"
variables={[{"id":"angle","type":"number","role":"style","label":"Angle","description":"Band and highlight gradient angle in degrees.","default":115,"min":60,"max":160,"step":1,"unit":"deg"},{"id":"sweep_at","type":"number","role":"timing","label":"Sweep start","description":"Seconds after mount start when the band starts crossing.","default":0.9,"min":0,"max":8,"step":0.05,"unit":"s"},{"id":"strength","type":"enum","role":"style","label":"Strength","description":"Band opacity and highlight bloom multiplier.","default":"standard","options":[{"value":"subtle","label":"Subtle"},{"value":"standard","label":"Standard"}]},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Tint inside the band and the highlight blooms.","default":"green","options":[{"value":"green","label":"Green"},{"value":"blue","label":"Blue"},{"value":"violet","label":"Violet"}]},{"id":"exit","type":"enum","role":"timing","label":"Exit","description":"Outgoing transition. None holds the settled key.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html light-sweep-pass.html
<!doctype html>
<!--
light-sweep-pass: HyperFrames video primitive (overlays / light)
Concept: a traveling key light re-shades a slotted scene. A soft diagonal
gradient band crosses the frame once while every per-element highlight and
shadow shifts in lockstep, then the light settles into a resting key from
the upper third. Quiet, expensive-feeling; the scene itself never moves.
Wave L, unit L3. Reference: motion-reference/ordinaryfolkco
2001090228958752945 (the traveling light band re-shading the frame).
ONE PROPERTY OWNS THE PASS: --light-x (a unitless 0-100-ish scalar on
#root) is the only animated value. The band's translate, every element's
highlight bloom, every shadow offset, and the ambient lift all read it
through calc()/clamp()/max() in static CSS. The timeline tweens a plain
JS number proxy and writes --light-x in onUpdate (never a var() string),
so seeks in any order resolve the same computed styles.
Slot (see README.md for a worked example):
- [data-slot="scene"]: the full-bleed scene being lit. Replace the
children of this element in your installed copy. Default: a token
hero card and three feature cards. Elements opt into the light with
the data-lit attribute plus an inline --lsp-x (their center along
the sweep axis, percent of frame width).
Variables (declared in data-composition-variables below):
- angle (number, degrees, default 115, 60 to 160): band and highlight
gradient angle. 115 reads as upper-left key light.
- sweep_at (number, seconds, default 0.9): when the band starts
crossing, relative to mount start.
- strength (subtle | standard, default standard): band opacity and
highlight bloom multiplier. subtle is the barely-there pass.
- accent (green | blue | violet, default green): warm tint inside the
band and the highlight blooms. green maps to --brand, blue to
--accent, violet to --accent-2.
- exit (none | fade | up, default none): outgoing transition. none
holds the settled key (frame roots own transitions).
Envelope (fixed IN/OUT, elastic HOLD only, never gsap.timeScale()):
IN = sweep_at + 1.60s crossing + 0.55s settle to the resting key
HOLD = elastic = max(0, D - (IN + OUT)); the settled key is still
OUT = 0.50s when exit is fade or up, 0 when exit is none
If D < IN + OUT, IN and OUT scale down together so IN + OUT == D.
Sync point: sweep-land when the light reaches its resting key (3.05s at
defaults). Dispatches a bubbling hf:sfx CustomEvent with id
"light-settle-soft" there. This primitive never plays audio.
Mount contract: MOUNTABLE SUB-COMPOSITION. The runtime clones only
<template> contents; #root fills the host box (inset:0, container-type:
size), has no data-width/data-height, and registers one paused timeline
under the literal "light-sweep-pass" key. Variables come from
window.__hyperframes.getVariables().
-->
<html
lang="en"
data-composition-id="light-sweep-pass"
data-composition-duration="4"
data-composition-variables='[
{ "id": "angle", "type": "number", "role": "style", "label": "Angle", "description": "Band and highlight gradient angle in degrees.", "default": 115, "min": 60, "max": 160, "step": 1, "unit": "deg" },
{ "id": "sweep_at", "type": "number", "role": "timing", "label": "Sweep start", "description": "Seconds after mount start when the band starts crossing.", "default": 0.9, "min": 0, "max": 8, "step": 0.05, "unit": "s" },
{ "id": "strength", "type": "enum", "role": "style", "label": "Strength", "description": "Band opacity and highlight bloom multiplier.", "default": "standard", "options": [{ "value": "subtle", "label": "Subtle" }, { "value": "standard", "label": "Standard" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Tint inside the band and the highlight blooms.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Outgoing transition. None holds the settled key.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Light Sweep Pass</title>
</head>
<body>
<template>
<div id="root" data-composition-id="light-sweep-pass" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* --light-x starts off-frame left; the timeline is its only
writer. --lsp-angle and --lsp-strength are set once at mount. */
#root {
--light-x: -35;
--lsp-angle: 115;
--lsp-strength: 1;
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #0b0c0e);
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.lsp-clip,
.lsp-stage,
.lsp-scene,
.lsp-ambient,
.lsp-band {
position: absolute;
inset: 0;
}
.lsp-clip {
overflow: hidden;
}
.lsp-stage {
opacity: 0;
}
.lsp-scene {
overflow: hidden;
}
/* Every lit element derives its whole treatment from the ONE
--light-x scalar: distance d to the band, |d| via max(d, -d),
a 0..1 proximity bloom, a shadow that slides away from the
light and deepens as the band passes. Elements opt in with
data-lit and an inline --lsp-x (center along the sweep axis,
percent of frame width). */
[data-lit] {
--lsp-d: calc(var(--light-x) - var(--lsp-x, 50));
--lsp-abs: max(var(--lsp-d), calc(-1 * var(--lsp-d)));
--lsp-glow: clamp(0, calc(1 - var(--lsp-abs) / 26), 1);
position: relative;
box-shadow: calc(clamp(-30, var(--lsp-d), 30) * -0.05cqw)
calc(0.8cqh + var(--lsp-glow) * 0.7cqh) calc(2.2cqh + var(--lsp-glow) * 2.4cqh)
color-mix(in srgb, #000000 26%, transparent);
}
/* The highlight bloom: a static angle-matched gradient whose
opacity is the proximity term. No transitions, no tweens. */
[data-lit]::after {
content: "";
position: absolute;
inset: 0;
border-radius: inherit;
pointer-events: none;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
color-mix(in srgb, #ffffff 86%, var(--lsp-accent, #22c55e)) 0%,
transparent 62%
);
opacity: calc(var(--lsp-glow) * 0.32 * var(--lsp-strength));
}
/* Ambient lift: the scene starts a touch dim and brightens for
good once the band has entered the frame. Monotonic in
--light-x, so the settle never re-dims it. */
.lsp-ambient {
pointer-events: none;
background: #000000;
opacity: calc(clamp(0, (26 - var(--light-x)) / 130, 0.16) * var(--lsp-strength));
}
/* The band: an oversized angle-matched gradient sheet that only
ever translates along X, driven by the same scalar. Screen
blend keeps it a light, never a paint. */
.lsp-band {
inset: -55%;
pointer-events: none;
mix-blend-mode: screen;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
transparent 36%,
color-mix(in srgb, #ffffff 24%, transparent) 46%,
color-mix(in srgb, #ffffff 78%, var(--lsp-accent, #22c55e)) 50%,
color-mix(in srgb, #ffffff 24%, transparent) 54%,
transparent 64%
);
opacity: 0;
transform: translateX(calc((var(--light-x) - 50) * 1.4cqw));
will-change: transform, opacity;
}
#root[data-strength="subtle"] {
--lsp-strength: 0.55;
}
/* ---------- default slot scene: token hero + three cards ---------- */
.lsp-default {
position: absolute;
inset: 0;
display: grid;
grid-template-rows: auto auto;
align-content: center;
justify-items: center;
row-gap: var(--space-3, 5cqh);
padding: var(--space-3, 6cqh) 10cqw;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
color-mix(in srgb, var(--fg, #f8fafc) 3%, var(--bg, #0b0c0e)) 0%,
var(--bg, #0b0c0e) 55%,
color-mix(in srgb, #000000 6%, var(--bg, #0b0c0e)) 100%
);
}
.lsp-hero {
display: grid;
align-content: center;
row-gap: var(--space-2, 2.4cqh);
width: 58cqw;
height: 30cqh;
padding: var(--space-3, 4cqh) var(--space-3, 3cqw);
border: 0.16cqw solid var(--border, #343a46);
border-radius: var(--radius, 2.4cqmin);
background: var(--surface, #14171c);
}
.lsp-hero-bar {
width: 46%;
height: 4.6cqh;
border-radius: 1.4cqh;
background: color-mix(in srgb, var(--fg, #f8fafc) 82%, var(--surface, #14171c));
}
.lsp-hero-line {
height: 2.2cqh;
border-radius: 1.1cqh;
background: var(--muted, #94a3b8);
opacity: 0.55;
}
.lsp-hero-line:nth-of-type(3) {
width: 72%;
}
.lsp-row {
display: grid;
grid-template-columns: repeat(3, 1fr);
column-gap: var(--space-2, 2cqw);
width: 58cqw;
}
.lsp-card {
display: grid;
align-content: start;
row-gap: var(--space-1, 1.6cqh);
height: 24cqh;
padding: var(--space-2, 2.6cqh) var(--space-2, 1.6cqw);
border: 0.16cqw solid var(--border, #343a46);
border-radius: var(--radius, 2.4cqmin);
background: var(--surface, #14171c);
}
.lsp-dot {
width: 3.4cqh;
height: 3.4cqh;
border-radius: 50%;
background: color-mix(in srgb, var(--lsp-accent, #22c55e) 72%, var(--surface, #14171c));
}
.lsp-line {
height: 1.9cqh;
border-radius: 1cqh;
background: var(--muted, #94a3b8);
opacity: 0.5;
}
.lsp-line:nth-of-type(3) {
width: 64%;
}
</style>
<div
id="light-sweep-pass-clip"
class="lsp-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="lsp-stage">
<div class="lsp-scene" data-slot="scene">
<!-- SLOT "scene": replace the children of this element with
your own full-bleed content. Mark elements that should
catch the light with data-lit and give each an inline
style="--lsp-x: NN" (center along the sweep, percent). -->
<div class="lsp-default" aria-hidden="true">
<div class="lsp-hero" data-lit style="--lsp-x: 50">
<div class="lsp-hero-bar"></div>
<div class="lsp-hero-line"></div>
<div class="lsp-hero-line"></div>
</div>
<div class="lsp-row">
<div class="lsp-card" data-lit style="--lsp-x: 31">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
<div class="lsp-card" data-lit style="--lsp-x: 50">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
<div class="lsp-card" data-lit style="--lsp-x: 69">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
</div>
</div>
</div>
<div class="lsp-ambient" aria-hidden="true"></div>
<div class="lsp-band" aria-hidden="true"></div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
// Literal id: mount flattening strips data-composition-id from the
// live root before this timeline registers.
var compositionId = "light-sweep-pass";
var stage = root.querySelector(".lsp-stage");
var band = root.querySelector(".lsp-band");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
function clampNumber(raw, fallback, min, max) {
var value = raw == null ? fallback : Number(raw);
if (!Number.isFinite(value)) return fallback;
return Math.max(min, Math.min(max, value));
}
var angle = clampNumber(vars.angle, 115, 60, 160);
var sweepAt = clampNumber(vars.sweep_at, 0.9, 0, 8);
var strength = vars.strength === "subtle" ? "subtle" : "standard";
var accentTokens = {
green: "var(--brand, #22c55e)",
blue: "var(--accent, #38bdf8)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentTokens, vars.accent)
? vars.accent
: "green";
// The bundler mirrors composition variables as scoped CSS custom
// props, so this unit's own accent variable can shadow the contract
// --accent token ("blue" is a valid CSS color). When the shadow is
// present, fall back to the literal contract value.
var shadowedAccent = getComputedStyle(root).getPropertyValue("--accent").trim();
if (
shadowedAccent === "green" ||
shadowedAccent === "blue" ||
shadowedAccent === "violet"
) {
accentTokens.blue = "#38bdf8";
}
// INVARIANT: only none | fade | up reaches the timeline.
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.strength = strength;
root.style.setProperty("--lsp-angle", String(angle));
root.style.setProperty("--lsp-accent", accentTokens[accent]);
// RETIME RANGE: fixed IN and OUT scale together only when D is
// too short. HOLD is the sole elastic phase. Never timeScale().
var SWEEP_BASE = 1.6;
var SETTLE_BASE = 0.55;
var STAGE_IN_BASE = 0.5;
var IN_BASE = sweepAt + SWEEP_BASE + SETTLE_BASE;
var OUT_BASE = exit === "none" ? 0 : 0.5;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = IN_BASE + OUT_BASE;
var scale = duration < totalBase ? duration / totalBase : 1;
var SWEEP = SWEEP_BASE * scale;
var SETTLE = SETTLE_BASE * scale;
var STAGE_IN = Math.min(STAGE_IN_BASE * scale, IN_BASE * scale);
var SWEEP_AT = sweepAt * scale;
var SWEEP_END = SWEEP_AT + SWEEP;
var IN = IN_BASE * scale;
var OUT = OUT_BASE * scale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
// The light's authored waypoints: parked off-frame left, fully
// crossed off-frame right, then the resting key in the upper
// third of the travel. All in --light-x units (frame percent).
var LIGHT_START = -35;
var LIGHT_CROSSED = 118;
var LIGHT_REST = 62;
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
// ONE proxy owns --light-x; every highlight, shadow, ambient
// lift, and the band transform read it via calc in static CSS.
var light = { x: LIGHT_START };
function writeLight() {
root.style.setProperty("--light-x", light.x.toFixed(3));
}
writeLight();
gsap.set(stage, { opacity: 0, y: "1.5cqh" });
gsap.set(band, { autoAlpha: 0 });
var tl = gsap.timeline({ paused: true });
// IN: the scene settles first, then one confident crossing.
tl.to(stage, { opacity: 1, y: "0cqh", duration: STAGE_IN, ease: "power2.out" }, 0);
tl.fromTo(
light,
{ x: LIGHT_START },
{
x: LIGHT_CROSSED,
duration: SWEEP,
ease: "sine.inOut",
onUpdate: writeLight,
},
SWEEP_AT,
);
tl.fromTo(
band,
{ autoAlpha: 0 },
{
autoAlpha: 1,
duration: Math.min(0.3 * scale, SWEEP),
ease: "power1.out",
immediateRender: false,
},
SWEEP_AT,
);
tl.to(
band,
{ autoAlpha: 0, duration: 0.35 * scale, ease: "power1.in" },
Math.max(SWEEP_AT, SWEEP_END - 0.35 * scale),
);
// The settle: the band is gone; the key light glides back to its
// resting position and the per-element shading follows it there.
tl.to(
light,
{ x: LIGHT_REST, duration: SETTLE, ease: "power2.out", onUpdate: writeLight },
SWEEP_END,
);
tl.call(
function () {
fireSfx("light-settle-soft", IN);
},
[],
IN,
);
// HOLD: deliberately still under the settled key.
// OUT: only when the exit variable asks for one.
if (exit !== "none") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
if (exit === "up") {
tl.to(stage, { y: "-6cqh", duration: OUT, ease: "power2.in" }, OUT_START);
}
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Paste it into your composition
Open `compositions/components/light-sweep-pass.html` and copy what is inside into your own composition.
A component has no size or duration of its own. It takes both from the composition
you paste it into.
## Variables
Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:
| Variable | Default | Accepts | What it does |
| --- | --- | --- | --- |
| `angle` | `115` | 60deg to 160deg, step 1deg | Band and highlight gradient angle in degrees. |
| `sweep_at` | `0.9` | 0s to 8s, step 0.05s | Seconds after mount start when the band starts crossing. |
| `strength` | `standard` | `subtle`, `standard` | Band opacity and highlight bloom multiplier. |
| `accent` | `green` | `green`, `blue`, `violet` | Tint inside the band and the highlight blooms. |
| `exit` | `none` | `none`, `fade`, `up` | Outgoing transition. None holds the settled key. |
Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
```html wrap
<div
data-composition-id="light-sweep-pass"
data-composition-src="compositions/components/light-sweep-pass.html"
data-variable-values='{"angle":115,"sweep_at":0.9,"strength":"standard","accent":"green","exit":"none"}'
></div>
```
## Source
<Accordion title="light-sweep-pass.html">
```html
<!doctype html>
<!--
light-sweep-pass: HyperFrames video primitive (overlays / light)
Concept: a traveling key light re-shades a slotted scene. A soft diagonal
gradient band crosses the frame once while every per-element highlight and
shadow shifts in lockstep, then the light settles into a resting key from
the upper third. Quiet, expensive-feeling; the scene itself never moves.
Wave L, unit L3. Reference: motion-reference/ordinaryfolkco
2001090228958752945 (the traveling light band re-shading the frame).
ONE PROPERTY OWNS THE PASS: --light-x (a unitless 0-100-ish scalar on
#root) is the only animated value. The band's translate, every element's
highlight bloom, every shadow offset, and the ambient lift all read it
through calc()/clamp()/max() in static CSS. The timeline tweens a plain
JS number proxy and writes --light-x in onUpdate (never a var() string),
so seeks in any order resolve the same computed styles.
Slot (see README.md for a worked example):
- [data-slot="scene"]: the full-bleed scene being lit. Replace the
children of this element in your installed copy. Default: a token
hero card and three feature cards. Elements opt into the light with
the data-lit attribute plus an inline --lsp-x (their center along
the sweep axis, percent of frame width).
Variables (declared in data-composition-variables below):
- angle (number, degrees, default 115, 60 to 160): band and highlight
gradient angle. 115 reads as upper-left key light.
- sweep_at (number, seconds, default 0.9): when the band starts
crossing, relative to mount start.
- strength (subtle | standard, default standard): band opacity and
highlight bloom multiplier. subtle is the barely-there pass.
- accent (green | blue | violet, default green): warm tint inside the
band and the highlight blooms. green maps to --brand, blue to
--accent, violet to --accent-2.
- exit (none | fade | up, default none): outgoing transition. none
holds the settled key (frame roots own transitions).
Envelope (fixed IN/OUT, elastic HOLD only, never gsap.timeScale()):
IN = sweep_at + 1.60s crossing + 0.55s settle to the resting key
HOLD = elastic = max(0, D - (IN + OUT)); the settled key is still
OUT = 0.50s when exit is fade or up, 0 when exit is none
If D < IN + OUT, IN and OUT scale down together so IN + OUT == D.
Sync point: sweep-land when the light reaches its resting key (3.05s at
defaults). Dispatches a bubbling hf:sfx CustomEvent with id
"light-settle-soft" there. This primitive never plays audio.
Mount contract: MOUNTABLE SUB-COMPOSITION. The runtime clones only
<template> contents; #root fills the host box (inset:0, container-type:
size), has no data-width/data-height, and registers one paused timeline
under the literal "light-sweep-pass" key. Variables come from
window.__hyperframes.getVariables().
-->
<html
lang="en"
data-composition-id="light-sweep-pass"
data-composition-duration="4"
data-composition-variables='[
{ "id": "angle", "type": "number", "role": "style", "label": "Angle", "description": "Band and highlight gradient angle in degrees.", "default": 115, "min": 60, "max": 160, "step": 1, "unit": "deg" },
{ "id": "sweep_at", "type": "number", "role": "timing", "label": "Sweep start", "description": "Seconds after mount start when the band starts crossing.", "default": 0.9, "min": 0, "max": 8, "step": 0.05, "unit": "s" },
{ "id": "strength", "type": "enum", "role": "style", "label": "Strength", "description": "Band opacity and highlight bloom multiplier.", "default": "standard", "options": [{ "value": "subtle", "label": "Subtle" }, { "value": "standard", "label": "Standard" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Tint inside the band and the highlight blooms.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Outgoing transition. None holds the settled key.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Light Sweep Pass</title>
</head>
<body>
<template>
<div id="root" data-composition-id="light-sweep-pass" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* --light-x starts off-frame left; the timeline is its only
writer. --lsp-angle and --lsp-strength are set once at mount. */
#root {
--light-x: -35;
--lsp-angle: 115;
--lsp-strength: 1;
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #0b0c0e);
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.lsp-clip,
.lsp-stage,
.lsp-scene,
.lsp-ambient,
.lsp-band {
position: absolute;
inset: 0;
}
.lsp-clip {
overflow: hidden;
}
.lsp-stage {
opacity: 0;
}
.lsp-scene {
overflow: hidden;
}
/* Every lit element derives its whole treatment from the ONE
--light-x scalar: distance d to the band, |d| via max(d, -d),
a 0..1 proximity bloom, a shadow that slides away from the
light and deepens as the band passes. Elements opt in with
data-lit and an inline --lsp-x (center along the sweep axis,
percent of frame width). */
[data-lit] {
--lsp-d: calc(var(--light-x) - var(--lsp-x, 50));
--lsp-abs: max(var(--lsp-d), calc(-1 * var(--lsp-d)));
--lsp-glow: clamp(0, calc(1 - var(--lsp-abs) / 26), 1);
position: relative;
box-shadow: calc(clamp(-30, var(--lsp-d), 30) * -0.05cqw)
calc(0.8cqh + var(--lsp-glow) * 0.7cqh) calc(2.2cqh + var(--lsp-glow) * 2.4cqh)
color-mix(in srgb, #000000 26%, transparent);
}
/* The highlight bloom: a static angle-matched gradient whose
opacity is the proximity term. No transitions, no tweens. */
[data-lit]::after {
content: "";
position: absolute;
inset: 0;
border-radius: inherit;
pointer-events: none;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
color-mix(in srgb, #ffffff 86%, var(--lsp-accent, #22c55e)) 0%,
transparent 62%
);
opacity: calc(var(--lsp-glow) * 0.32 * var(--lsp-strength));
}
/* Ambient lift: the scene starts a touch dim and brightens for
good once the band has entered the frame. Monotonic in
--light-x, so the settle never re-dims it. */
.lsp-ambient {
pointer-events: none;
background: #000000;
opacity: calc(clamp(0, (26 - var(--light-x)) / 130, 0.16) * var(--lsp-strength));
}
/* The band: an oversized angle-matched gradient sheet that only
ever translates along X, driven by the same scalar. Screen
blend keeps it a light, never a paint. */
.lsp-band {
inset: -55%;
pointer-events: none;
mix-blend-mode: screen;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
transparent 36%,
color-mix(in srgb, #ffffff 24%, transparent) 46%,
color-mix(in srgb, #ffffff 78%, var(--lsp-accent, #22c55e)) 50%,
color-mix(in srgb, #ffffff 24%, transparent) 54%,
transparent 64%
);
opacity: 0;
transform: translateX(calc((var(--light-x) - 50) * 1.4cqw));
will-change: transform, opacity;
}
#root[data-strength="subtle"] {
--lsp-strength: 0.55;
}
/* ---------- default slot scene: token hero + three cards ---------- */
.lsp-default {
position: absolute;
inset: 0;
display: grid;
grid-template-rows: auto auto;
align-content: center;
justify-items: center;
row-gap: var(--space-3, 5cqh);
padding: var(--space-3, 6cqh) 10cqw;
background: linear-gradient(
calc(var(--lsp-angle) * 1deg),
color-mix(in srgb, var(--fg, #f8fafc) 3%, var(--bg, #0b0c0e)) 0%,
var(--bg, #0b0c0e) 55%,
color-mix(in srgb, #000000 6%, var(--bg, #0b0c0e)) 100%
);
}
.lsp-hero {
display: grid;
align-content: center;
row-gap: var(--space-2, 2.4cqh);
width: 58cqw;
height: 30cqh;
padding: var(--space-3, 4cqh) var(--space-3, 3cqw);
border: 0.16cqw solid var(--border, #343a46);
border-radius: var(--radius, 2.4cqmin);
background: var(--surface, #14171c);
}
.lsp-hero-bar {
width: 46%;
height: 4.6cqh;
border-radius: 1.4cqh;
background: color-mix(in srgb, var(--fg, #f8fafc) 82%, var(--surface, #14171c));
}
.lsp-hero-line {
height: 2.2cqh;
border-radius: 1.1cqh;
background: var(--muted, #94a3b8);
opacity: 0.55;
}
.lsp-hero-line:nth-of-type(3) {
width: 72%;
}
.lsp-row {
display: grid;
grid-template-columns: repeat(3, 1fr);
column-gap: var(--space-2, 2cqw);
width: 58cqw;
}
.lsp-card {
display: grid;
align-content: start;
row-gap: var(--space-1, 1.6cqh);
height: 24cqh;
padding: var(--space-2, 2.6cqh) var(--space-2, 1.6cqw);
border: 0.16cqw solid var(--border, #343a46);
border-radius: var(--radius, 2.4cqmin);
background: var(--surface, #14171c);
}
.lsp-dot {
width: 3.4cqh;
height: 3.4cqh;
border-radius: 50%;
background: color-mix(in srgb, var(--lsp-accent, #22c55e) 72%, var(--surface, #14171c));
}
.lsp-line {
height: 1.9cqh;
border-radius: 1cqh;
background: var(--muted, #94a3b8);
opacity: 0.5;
}
.lsp-line:nth-of-type(3) {
width: 64%;
}
</style>
<div
id="light-sweep-pass-clip"
class="lsp-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="lsp-stage">
<div class="lsp-scene" data-slot="scene">
<!-- SLOT "scene": replace the children of this element with
your own full-bleed content. Mark elements that should
catch the light with data-lit and give each an inline
style="--lsp-x: NN" (center along the sweep, percent). -->
<div class="lsp-default" aria-hidden="true">
<div class="lsp-hero" data-lit style="--lsp-x: 50">
<div class="lsp-hero-bar"></div>
<div class="lsp-hero-line"></div>
<div class="lsp-hero-line"></div>
</div>
<div class="lsp-row">
<div class="lsp-card" data-lit style="--lsp-x: 31">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
<div class="lsp-card" data-lit style="--lsp-x: 50">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
<div class="lsp-card" data-lit style="--lsp-x: 69">
<div class="lsp-dot"></div>
<div class="lsp-line"></div>
<div class="lsp-line"></div>
</div>
</div>
</div>
</div>
<div class="lsp-ambient" aria-hidden="true"></div>
<div class="lsp-band" aria-hidden="true"></div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
// Literal id: mount flattening strips data-composition-id from the
// live root before this timeline registers.
var compositionId = "light-sweep-pass";
var stage = root.querySelector(".lsp-stage");
var band = root.querySelector(".lsp-band");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
function clampNumber(raw, fallback, min, max) {
var value = raw == null ? fallback : Number(raw);
if (!Number.isFinite(value)) return fallback;
return Math.max(min, Math.min(max, value));
}
var angle = clampNumber(vars.angle, 115, 60, 160);
var sweepAt = clampNumber(vars.sweep_at, 0.9, 0, 8);
var strength = vars.strength === "subtle" ? "subtle" : "standard";
var accentTokens = {
green: "var(--brand, #22c55e)",
blue: "var(--accent, #38bdf8)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentTokens, vars.accent)
? vars.accent
: "green";
// The bundler mirrors composition variables as scoped CSS custom
// props, so this unit's own accent variable can shadow the contract
// --accent token ("blue" is a valid CSS color). When the shadow is
// present, fall back to the literal contract value.
var shadowedAccent = getComputedStyle(root).getPropertyValue("--accent").trim();
if (
shadowedAccent === "green" ||
shadowedAccent === "blue" ||
shadowedAccent === "violet"
) {
accentTokens.blue = "#38bdf8";
}
// INVARIANT: only none | fade | up reaches the timeline.
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.strength = strength;
root.style.setProperty("--lsp-angle", String(angle));
root.style.setProperty("--lsp-accent", accentTokens[accent]);
// RETIME RANGE: fixed IN and OUT scale together only when D is
// too short. HOLD is the sole elastic phase. Never timeScale().
var SWEEP_BASE = 1.6;
var SETTLE_BASE = 0.55;
var STAGE_IN_BASE = 0.5;
var IN_BASE = sweepAt + SWEEP_BASE + SETTLE_BASE;
var OUT_BASE = exit === "none" ? 0 : 0.5;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = IN_BASE + OUT_BASE;
var scale = duration < totalBase ? duration / totalBase : 1;
var SWEEP = SWEEP_BASE * scale;
var SETTLE = SETTLE_BASE * scale;
var STAGE_IN = Math.min(STAGE_IN_BASE * scale, IN_BASE * scale);
var SWEEP_AT = sweepAt * scale;
var SWEEP_END = SWEEP_AT + SWEEP;
var IN = IN_BASE * scale;
var OUT = OUT_BASE * scale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
// The light's authored waypoints: parked off-frame left, fully
// crossed off-frame right, then the resting key in the upper
// third of the travel. All in --light-x units (frame percent).
var LIGHT_START = -35;
var LIGHT_CROSSED = 118;
var LIGHT_REST = 62;
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
// ONE proxy owns --light-x; every highlight, shadow, ambient
// lift, and the band transform read it via calc in static CSS.
var light = { x: LIGHT_START };
function writeLight() {
root.style.setProperty("--light-x", light.x.toFixed(3));
}
writeLight();
gsap.set(stage, { opacity: 0, y: "1.5cqh" });
gsap.set(band, { autoAlpha: 0 });
var tl = gsap.timeline({ paused: true });
// IN: the scene settles first, then one confident crossing.
tl.to(stage, { opacity: 1, y: "0cqh", duration: STAGE_IN, ease: "power2.out" }, 0);
tl.fromTo(
light,
{ x: LIGHT_START },
{
x: LIGHT_CROSSED,
duration: SWEEP,
ease: "sine.inOut",
onUpdate: writeLight,
},
SWEEP_AT,
);
tl.fromTo(
band,
{ autoAlpha: 0 },
{
autoAlpha: 1,
duration: Math.min(0.3 * scale, SWEEP),
ease: "power1.out",
immediateRender: false,
},
SWEEP_AT,
);
tl.to(
band,
{ autoAlpha: 0, duration: 0.35 * scale, ease: "power1.in" },
Math.max(SWEEP_AT, SWEEP_END - 0.35 * scale),
);
// The settle: the band is gone; the key light glides back to its
// resting position and the per-element shading follows it there.
tl.to(
light,
{ x: LIGHT_REST, duration: SETTLE, ease: "power2.out", onUpdate: writeLight },
SWEEP_END,
);
tl.call(
function () {
fireSfx("light-settle-soft", IN);
},
[],
IN,
);
// HOLD: deliberately still under the settled key.
// OUT: only when the exit variable asks for one.
if (exit !== "none") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
if (exit === "up") {
tl.to(stage, { y: "-6cqh", duration: OUT, ease: "power2.in" }, OUT_START);
}
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `motion-primitive` `overlay` `light` `sweep` `slots` `deterministic`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)