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hyperframes/docs/primitives/echo-trail.mdx
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Miguel Angel Simon Sierra bb912587b9 feat(primitives): add 25 video primitives, live docs pages, and the catalog retrieval eval
Adds the 25 video primitive compositions and their generated Mintlify pages.
Each page embeds a live <hyperframes-player> preview with editable composition
variables rather than a rendered MP4.

Adds the catalog-browsing eval under evals/catalog-retrieval: a 424-entry shelf
built from HEAD, nine retrieval conditions (no-catalog control, full read,
lexical, semantic, and hybrid across several values of k), a brief generator
that constructs each brief from a known target, a blind three-pass gold
validation committee, and a mechanical scorer that keeps mountable and fit as
two separate numbers.

The eval vendors its own shelf, primitive sources, and preview list instead of
reading them from an ignored working directory, so the shelf regenerates byte
for byte from a clean checkout. Derived artifacts stay out: the embedding cache
and the run checkpoints are regenerated rather than committed, so no run can
score against a stale copy of either.

Lint ignores now cover vendored minified player bundles by pattern instead of
one path at a time.
2026-07-31 12:27:41 +02:00

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---
title: "Echo Trail"
description: "A slotted subject travels along an authored path with lagged ghost copies that collapse into it and disappear at rest."
---
import { PrimitivePlayer } from "/snippets/PrimitivePlayer.jsx";
<span className="hf-primitive-eyebrow">Motion trails</span>
<PrimitivePlayer name="echo-trail" width={1920} height={1080} />
## Variables
| Name | Type | Default | Description |
| --- | --- | --- | --- |
| `echoes` | `number` | `4` | Ghost copy count, clamped 2 to 6. |
| `delta` | `number` | `0.09` | Lag between successive ghosts in seconds, clamped 0.03 to 0.3. |
| `path` | `enum` | `sweep` | Authored traversal preset. |
| `accent` | `enum` | `green` | Subject accent color: green rides --brand, blue rides --accent, violet rides --accent-2. |
| `exit` | `enum` | `none` | Optional departure. Default none: the settled element holds until the frame cuts. |
## When to use it
One moving subject needs an onion-skin trail that shows its recent positions before a clean landing.
## When to avoid it
Avoid it when more than six ghosts or a lag outside 0.03 to 0.3 seconds is required, because echoes are limited to 2 through 6 and delta is clamped to that range.
## Pairs with
- [particle-text-dissolve](/primitives/particle-text-dissolve)
- [orbit-ring-camera](/primitives/orbit-ring-camera)
## Install
<CodeGroup>
```bash Terminal
npx hyperframes add echo-trail
```
</CodeGroup>