---
title: "Loop Stack 3"
description: "Image cards deal onto a receding stack. 8 image slots, 8s seamless loop, 1:1."
---

import { InstallCommand } from "/snippets/install-command.jsx";

<video className="w-full aspect-video rounded-xl object-cover bg-zinc-100 dark:bg-zinc-800" src="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/loop-stack-3.mp4" poster="https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/loop-stack-3.png" autoPlay muted loop playsInline />

## Install

<InstallCommand command="npx hyperframes add loop-stack-3" item="loop-stack-3" />

That writes one file: `compositions/loop-stack-3.html`.

## Add it to your video

It runs for 8 seconds at 1080×1080. Paste this into your composition:

```html index.html
<div
  data-composition-id="loop-stack-3"
  data-composition-src="compositions/loop-stack-3.html"
  data-start="0"
  data-duration="8"
  data-track-index="1"
  data-width="1080"
  data-height="1080"
></div>
```

Move it in time with `data-start`. Put it on a different timeline row with
`data-track-index`. See [data attributes](/concepts/data-attributes) for the rest.

## 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 |
| --- | --- | --- | --- |
| `mediaFit` | `natural` | `natural`, `crop` | Natural keeps each image's own ratio; Crop fills the card box at the media aspect below. |
| `cropAspectRatio` | `1:1` | `16:9`, `9:16`, `1:1`, `4:5`, `3:2`, `3:4`, `2:3` | Card aspect used when Fit is Crop. |
| `backgroundType` | `gradient` | `gradient`, `color`, `image` | Gradient (start → end colours), flat Colour, or your own Image. |
| `backgroundGradientStart` | `#111111` | color | Top colour of the gradient. |
| `backgroundGradientEnd` | `#444444` | color | Bottom colour of the gradient. |
| `backgroundColor` | `#0b0b0f` | color | Flat colour when Type is Color; also the ground under an Image. |
| `backgroundImage` | `` | image | Cover-fitted background when Type is Image. |
| `blurAmount` | `0` | 0px to 60px, step 1px | Blur on the background image, px. |
| `backgroundGradientNoise` | `0` | 0% to 100%, step 1% | Film-grain overlay strength. |
| `backgroundOpacity` | `1` | 0 to 1, step 0.05 | Opacity of the whole background layer (0 = transparent ground). |
| `borderRadius` | `0` | 0px to 200px, step 1px | Card corner radius in px at 1080. |
| `cycles` | `1` | 0 to 10, step 0.1 | Number of motion cycles per loop. |
| `stagger` | `0` | 0 to 2, step 0.01 | Stagger (engine parameter; see the block header comment). |
| `delay` | `0` | 0s to 2s, step 0.01s | Hold time between steps, seconds. |
| `direction` | `down` | `down`, `up` | Direction of travel. |
| `planeSize` | `24` | 0 to 76, step 1 | Card size in scene units. |
| `visible` | `6` | 0 to 12, step 0.1 | Visible (engine parameter; see the block header comment). |
| `perspective` | `123` | 0 to 246, step 10 | Camera focal length: smaller = stronger perspective. |
| `zoom` | `267` | 0 to 534, step 10 | Zoom (engine parameter; see the block header comment). |
| `offsetX` | `0` | -100% to 100%, step 1% | Horizontal offset of the formation, % of width. |
| `offsetY` | `-7.5` | -100% to 100%, step 1% | Vertical offset of the formation, % of height. |
| `image1` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1050' viewBox%3D'0 0 1400 1050'%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1046' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 778.05H621.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M286.65 778.05L379.05 662.55L471.45 778.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'552.3' cy%3D'674.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 1 of 8. Any aspect; fitted per mediaFit. |
| `image2` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'788' viewBox%3D'0 0 1400 788'%3E%3Crect width%3D'1400' height%3D'788' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'788' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'784' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 583.908H529.376' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'12.382857142857144' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M278.004 583.908L347.348 497.228L416.692 583.908Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'477.36800000000005' cy%3D'505.896' r%3D'26.004' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 2 of 8. Any aspect; fitted per mediaFit. |
| `image3` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1050' height%3D'1400' viewBox%3D'0 0 1050 1400'%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1046' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M189 995.05H558.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M223.65 995.05L316.05 879.55L408.45 995.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'489.3' cy%3D'891.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 3 of 8. Any aspect; fitted per mediaFit. |
| `image4` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1400' viewBox%3D'0 0 1400 1400'%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 1037.4H744.8' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'22' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M298.2 1037.4L421.4 883.4L544.5999999999999 1037.4Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'652.4000000000001' cy%3D'898.8' r%3D'46.199999999999996' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 4 of 8. Any aspect; fitted per mediaFit. |
| `image5` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1050' viewBox%3D'0 0 1400 1050'%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1046' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 778.05H621.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M286.65 778.05L379.05 662.55L471.45 778.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'552.3' cy%3D'674.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 5 of 8. Any aspect; fitted per mediaFit. |
| `image6` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'788' viewBox%3D'0 0 1400 788'%3E%3Crect width%3D'1400' height%3D'788' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'788' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'784' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 583.908H529.376' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'12.382857142857144' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M278.004 583.908L347.348 497.228L416.692 583.908Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'477.36800000000005' cy%3D'505.896' r%3D'26.004' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 6 of 8. Any aspect; fitted per mediaFit. |
| `image7` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1050' height%3D'1400' viewBox%3D'0 0 1050 1400'%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1046' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M189 995.05H558.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M223.65 995.05L316.05 879.55L408.45 995.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'489.3' cy%3D'891.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 7 of 8. Any aspect; fitted per mediaFit. |
| `image8` | `data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1400' viewBox%3D'0 0 1400 1400'%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 1037.4H744.8' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'22' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M298.2 1037.4L421.4 883.4L544.5999999999999 1037.4Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'652.4000000000001' cy%3D'898.8' r%3D'46.199999999999996' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E` | image | Image on card 8 of 8. Any aspect; fitted per mediaFit. |

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="loop-stack-3"
  data-composition-src="compositions/loop-stack-3.html"
  data-variable-values='{"mediaFit":"natural","cropAspectRatio":"1:1","backgroundType":"gradient","backgroundGradientStart":"#111111","backgroundGradientEnd":"#444444","backgroundColor":"#0b0b0f","backgroundImage":"","blurAmount":0,"backgroundGradientNoise":0,"backgroundOpacity":1,"borderRadius":0,"cycles":1,"stagger":0,"delay":0,"direction":"down","planeSize":24,"visible":6,"perspective":123,"zoom":267,"offsetX":0,"offsetY":-7.5,"image1":"data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1050' viewBox%3D'0 0 1400 1050'%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1046' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 778.05H621.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M286.65 778.05L379.05 662.55L471.45 778.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'552.3' cy%3D'674.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E","image2":"data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'788' viewBox%3D'0 0 1400 788'%3E%3Crect width%3D'1400' height%3D'788' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'788' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'784' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 583.908H529.376' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'12.382857142857144' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M278.004 583.908L347.348 497.228L416.692 583.908Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'477.36800000000005' cy%3D'505.896' r%3D'26.004' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E","image3":"data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1050' height%3D'1400' viewBox%3D'0 0 1050 1400'%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1050' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1046' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M189 995.05H558.6' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'16.5' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M223.65 995.05L316.05 879.55L408.45 995.05Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'489.3' cy%3D'891.1' r%3D'34.65' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E","image4":"data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1400' viewBox%3D'0 0 1400 1400'%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 1037.4H744.8' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'22' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M298.2 1037.4L421.4 883.4L544.5999999999999 1037.4Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'652.4000000000001' cy%3D'898.8' r%3D'46.199999999999996' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E","image5":"data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1050' viewBox%3D'0 0 1400 1050'%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1050' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1046' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' 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></div>
```

## Source

<Accordion title={`loop-stack-3.html`}>

```html
<!doctype html>
<html
  lang="en"
  data-composition-variables='[{"id":"mediaFit","type":"enum","role":"style","label":"Media · Fit","description":"Natural keeps each image&#39;s own ratio; Crop fills the card box at the media aspect below.","default":"natural","options":[{"value":"natural","label":"Natural (original ratio)"},{"value":"crop","label":"Crop"}]},{"id":"cropAspectRatio","type":"enum","role":"style","label":"Media · Aspect","description":"Card aspect used when Fit is Crop.","default":"1:1","options":[{"value":"16:9","label":"16:9"},{"value":"9:16","label":"9:16"},{"value":"1:1","label":"1:1"},{"value":"4:5","label":"4:5"},{"value":"3:2","label":"3:2"},{"value":"3:4","label":"3:4"},{"value":"2:3","label":"2:3"}]},{"id":"backgroundType","type":"enum","role":"style","label":"Background · Type","description":"Gradient (start → end colours), flat Colour, or your own Image.","default":"gradient","options":[{"value":"gradient","label":"Gradient"},{"value":"color","label":"Color"},{"value":"image","label":"Image"}]},{"id":"backgroundGradientStart","type":"color","role":"style","label":"Background · Gradient start","description":"Top colour of the gradient.","default":"#111111"},{"id":"backgroundGradientEnd","type":"color","role":"style","label":"Background · Gradient end","description":"Bottom colour of the gradient.","default":"#444444"},{"id":"backgroundColor","type":"color","role":"style","label":"Background · Color","description":"Flat colour when Type is Color; also the ground under an Image.","default":"#0b0b0f"},{"id":"backgroundImage","type":"image","role":"style","label":"Background · Image","description":"Cover-fitted background when Type is Image.","portrays":["background_image"],"default":""},{"id":"blurAmount","type":"number","role":"style","label":"Background · Blur","description":"Blur on the background image, px.","default":0,"min":0,"max":60,"step":1,"unit":"px"},{"id":"backgroundGradientNoise","type":"number","role":"style","label":"Background · Grain","description":"Film-grain overlay strength.","default":0,"min":0,"max":100,"step":1,"unit":"%"},{"id":"backgroundOpacity","type":"number","role":"style","label":"Background · Opacity","description":"Opacity of the whole background layer (0 = transparent ground).","default":1,"min":0,"max":1,"step":0.05},{"id":"borderRadius","type":"number","role":"style","label":"Appearance · Border radius","description":"Card corner radius in px at 1080.","default":0,"min":0,"max":200,"step":1,"unit":"px"},{"id":"cycles","type":"number","role":"style","label":"Animation · Cycles","description":"Number of motion cycles per loop.","default":1,"min":0,"max":10,"step":0.1},{"id":"stagger","type":"number","role":"style","label":"Animation · Stagger","description":"Stagger (engine parameter; see the block header comment).","default":0,"min":0,"max":2,"step":0.01},{"id":"delay","type":"number","role":"style","label":"Animation · Delay","description":"Hold time between steps, seconds.","default":0,"min":0,"max":2,"step":0.01,"unit":"s"},{"id":"direction","type":"enum","role":"style","label":"Animation · Direction","description":"Direction of travel.","default":"down","options":[{"value":"down","label":"Down"},{"value":"up","label":"Up"}]},{"id":"planeSize","type":"number","role":"style","label":"Template options · Media size","description":"Card size in scene units.","default":24,"min":0,"max":76,"step":1},{"id":"visible","type":"number","role":"style","label":"Template options · Visible","description":"Visible (engine parameter; see the block header comment).","default":6,"min":0,"max":12,"step":0.1},{"id":"perspective","type":"number","role":"style","label":"Template options · Perspective","description":"Camera focal length: smaller = stronger perspective.","default":123,"min":0,"max":246,"step":10},{"id":"zoom","type":"number","role":"style","label":"Template options · Zoom","description":"Zoom (engine parameter; see the block header comment).","default":267,"min":0,"max":534,"step":10},{"id":"offsetX","type":"number","role":"style","label":"Template options · Offset X","description":"Horizontal offset of the formation, % of width.","default":0,"min":-100,"max":100,"step":1,"unit":"%"},{"id":"offsetY","type":"number","role":"style","label":"Template options · Offset Y","description":"Vertical offset of the formation, % of height.","default":-7.5,"min":-100,"max":100,"step":1,"unit":"%"},{"id":"image1","type":"image","role":"content","label":"Media · Image 1","description":"Image on card 1 of 8. 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>
  <head>
    <title>loop-stack-3</title>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=1080, height=1080" />
    <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      html,
      body {
        width: 1080px;
        height: 1080px;
        overflow: hidden;
        background: #0b0b0f;
      }
      #loop-stack-3-bg {
        position: absolute;
        inset: 0;
      }
      #loop-stack-3-stage {
        position: absolute;
        left: 50%;
        top: 50%;
        width: 0;
        height: 0;
      }
      .card {
        position: absolute;
        overflow: hidden;
      }
      .card img {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: cover;
      }
    </style>
  </head>
  <body>
    <div
      id="loop-stack-3-root"
      data-composition-id="loop-stack-3"
      data-start="0"
      data-width="1080"
      data-height="1080"
      data-duration="8"
    >
      <div
        id="loop-stack-3-loop"
        class="clip"
        data-start="0"
        data-duration="8"
        data-track-index="1"
        data-layout-allow-overflow
      >
        <div id="loop-stack-3-bg"></div>
        <div id="loop-stack-3-stage"></div>
      </div>
    </div>
    <script>
      // Shared runtime for the the reference tool loop ports. Loaded by every family engine.
      // Everything here is a pure function of the HyperFrames variables + t.
      //
      // Reference constants (measured on the 512x512 preview library, 2026-09-08):
      //   Marquee planeSize -> 0.3% of frame height per unit (7 variants, all 1.54px/unit @512)
      //   Marquee gap       -> 0.2% of frame height per unit
      //   3D perspective    -> CSS focal length f = 1000px * (100/perspective) at H=1080
      //                        (3D01/02/08/11: card widths & far-card spacing match to <3%)
      // Both are calibrated on a SQUARE canvas; for 16:9 we scale by H. ponytail: if the
      // dashboard 16:9 reference shows width-relative scaling, flip REF below to W.
      window.RF = (() => {
        // Variables are injected by the inline script via RF.use(): HyperFrames wraps INLINE scripts in a
        // per-composition scope where getVariables() resolves; this external file only sees the host window.
        const V = {},
          MEDIA = [];
        const use = (vars, media) => {
          Object.assign(V, vars || {});
          MEDIA.splice(0, MEDIA.length, ...(media || []));
        };
        const root = document.querySelector("[data-composition-id]");
        const W = +root.dataset.width,
          H = +root.dataset.height;
        const REF = H;
        const num = (k, d) => (V[k] !== undefined && V[k] !== "" && !isNaN(+V[k]) ? +V[k] : d);
        const str = (k, d) => (V[k] !== undefined && V[k] !== "" ? String(V[k]) : d);
        const on = (k, d) => /^(true|on|1)$/i.test(str(k, d ? "on" : "off")); // spec booleans arrive as "true"/"false", enums as on/off

        function pick(n) {
          n = Math.max(1, Math.min(MEDIA.length, n | 0));
          return MEDIA.slice(0, n);
        }
        // aspect (w/h) a card takes for a media item under mediaFit + cropAspectRatio
        function aspect(m, fit, cropAR) {
          if (fit === "natural") return m.w / m.h;
          const [a, b] = String(cropAR || "1:1")
            .split(":")
            .map(Number);
          return a && b ? a / b : 1;
        }
        function card(m, w, h, radius) {
          const el = document.createElement("div");
          el.className = "card";
          el.style.cssText = `position:absolute;width:${w}px;height:${h}px;overflow:hidden;border-radius:${radius}px;`;
          const img = document.createElement("img");
          img.src = m.src;
          img.width = Math.round(w);
          img.height = Math.round(h);
          img.style.cssText = `display:block;width:${w}px;height:${h}px;object-fit:cover;`;
          el.appendChild(img);
          return el;
        }
        function background(el) {
          // the editor's Background panel: type gradient | color | image, gradient start/end, grain (noise %), opacity, image blur
          const type = str("backgroundType", "gradient");
          const c = str("backgroundColor", "#0b0b0f");
          el.style.background = c;
          if (type === "gradient") {
            const g1 = str("backgroundGradientStart", "#111111"),
              g2 = str("backgroundGradientEnd", "#444444");
            el.style.background = `linear-gradient(180deg, ${g1}, ${g2})`;
          } else if (type === "image") {
            const im = V.backgroundImage,
              src = im && typeof im === "object" ? im.url || im.src || "" : im || "";
            if (src) {
              el.style.background = `${c} url("${src}") center / cover no-repeat`;
              const b = num("blurAmount", 0);
              if (b > 0) el.style.filter = `blur(${b}px)`;
            }
          }
          el.style.opacity = String(Math.max(0, Math.min(1, num("backgroundOpacity", 1))));
          const noise = num("backgroundGradientNoise", 0);
          if (noise > 0) {
            const g = document.createElement("div");
            g.style.cssText = `position:absolute;inset:0;pointer-events:none;mix-blend-mode:overlay;opacity:${((noise / 100) * 0.7).toFixed(3)};background:url("data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'256'%20height%3D'256'%3E%3Cfilter%20id%3D'n'%3E%3CfeTurbulence%20type%3D'fractalNoise'%20baseFrequency%3D'0.9'%20numOctaves%3D'3'%20stitchTiles%3D'stitch'%20seed%3D'7'%2F%3E%3CfeColorMatrix%20values%3D'0%200%200%200%200.5%200%200%200%200%200.5%200%200%200%200%200.5%200%200%200%201%200'%2F%3E%3C%2Ffilter%3E%3Crect%20width%3D'256'%20height%3D'256'%20filter%3D'url(%23n)'%2F%3E%3C%2Fsvg%3E") 0 0 / 256px 256px repeat`;
            el.appendChild(g);
          }
        }
        const expoInOut = (x) =>
          x <= 0
            ? 0
            : x >= 1
              ? 1
              : x < 0.5
                ? Math.pow(2, 20 * x - 10) / 2
                : (2 - Math.pow(2, -20 * x + 10)) / 2;
        const frac = (x) => x - Math.floor(x);
        return {
          V,
          use,
          W,
          H,
          REF,
          num,
          str,
          on,
          MEDIA,
          pick,
          aspect,
          card,
          background,
          expoInOut,
          frac,
        };
      })();
    </script>
    <script>
      (async () => {
        // Stack loop family — "Cards deal onto a receding stack."
        // Measured on the Stack01 preview (11s, 8 images -> 41.25f steps), 2026-09-08:
        //   front card 292px square = planeSize*zoom/100 % of H (38*1.5 = 57% -> 292 @512), `visible` cards
        //   recede behind it, peeking out above (direction down) with sizes 292/264/226 = S*(1 - .079L - .017L^2)
        //   and top edges 134/108/80 (27px = 5.3% of H higher per level); the whole group's bbox is centred
        //   (80..426; offsetY -2.5 -> -2.5px, Stack03 -7.5 -> -19px: used 0.4% of H per unit).
        //   Stack03 (perspective 123, visible 6): front 328 = 64% H, tops every 20.7px, sizes
        //   1/.957/.909/.854/.787/.689 -> quadratic a=.038 b=.0048 (max err 1.7%); Stack01 a=.079 b=.017.
        //   Step: ONE smooth ease (bezier .5,0,.5,1) over the step moves every card one level toward the
        //   camera (front 292 -> 304 at f20, card2 274 -> 284 -> 288 at f21/24/27, model within 2px); the
        //   front card fades out around e = 0.5 over `stagger` of the step (0.0667*41.25 = 2.75f; luma
        //   74 -> 93 -> 97 -> 101 at f20..23), the new back card fades in over tau 0.635..0.855 (luma
        //   27,43,53,61,65,68,70 at f26..32, ease-out shape).
        // Guesses/knobs: recession constants (a, b, rise) interpolated linearly in perspective between the two
        //   measured variants; direction up mirrors the peek side (Stack02: peeks below, sheet agrees);
        //   cycles = steps per loop multiplier; delay = seconds of phase.
        // media list [{src,w,h}] is inlined by build.mjs; HyperFrames scopes inline scripts, so hand both to the shared lib explicitly
        const __V = Object.assign(
          {},
          (window.__hyperframes && window.__hyperframes.getVariables
            ? window.__hyperframes.getVariables()
            : null) || {},
          { loopDuration: 8, loopRepeat: 2, imageCount: 8 },
        );
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          "data:image/svg+xml,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' width%3D'1400' height%3D'1400' viewBox%3D'0 0 1400 1400'%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'%230b0b0f'%2F%3E%3Crect width%3D'1400' height%3D'1400' fill%3D'rgba(255%2C255%2C255%2C0.18)'%2F%3E%3Crect x%3D'2' y%3D'2' width%3D'1396' height%3D'1396' fill%3D'none' stroke%3D'rgba(255%2C255%2C255%2C0.14)' stroke-width%3D'4'%2F%3E%3Cpath d%3D'M252 1037.4H744.8' stroke%3D'rgba(255%2C255%2C255%2C0.45)' stroke-width%3D'22' stroke-linecap%3D'round'%2F%3E%3Cpath d%3D'M298.2 1037.4L421.4 883.4L544.5999999999999 1037.4Z' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3Ccircle cx%3D'652.4000000000001' cy%3D'898.8' r%3D'46.199999999999996' fill%3D'rgba(255%2C255%2C255%2C0.45)'%2F%3E%3C%2Fsvg%3E",
        ];
        const __MEDIA = await Promise.all(
          ["image1", "image2", "image3", "image4", "image5", "image6", "image7", "image8"].map(
            async (id, i) => {
              const v = __V[id];
              const src = (v && typeof v === "object" ? v.url || v.src : v) || __PH[i];
              const img = new Image();
              img.src = src;
              try {
                await img.decode();
              } catch (e) {}
              return { src, w: img.naturalWidth || 1400, h: img.naturalHeight || 1050 };
            },
          ),
        );
        RF.use(__V, __MEDIA);
        const { W, H, REF, num, str, pick, aspect, background, frac } = RF;
        const DUR = num("loopDuration", 11);
        const FIT = str("mediaFit", "natural");
        const CROP_AR = str("cropAspectRatio", "1:1");
        const S = ((num("planeSize", 38) * num("zoom", 150)) / 100 / 100) * REF;
        const VIS = Math.max(1, num("visible", 3) | 0);
        const OX = num("offsetX", 0) * 0.004 * REF,
          OY = num("offsetY", 0) * 0.004 * REF; // 0.4% of H per unit (S01 -2.5px, S03 -19px @512)
        const PERSP = num("perspective", 73);
        // recession constants: measured on Stack01 (perspective 73) and Stack03 (123), interpolated linearly in perspective (knob)
        const lerpP = (a73, a123) => a73 + ((PERSP - 73) * (a123 - a73)) / 50;
        const RA = Math.max(0.005, lerpP(0.079, 0.038)),
          RB = Math.max(0, lerpP(0.017, 0.0048));
        const CYCLES = Math.max(1, num("cycles", 1) | 0);
        const STAG = num("stagger", 0.0667);
        const DELAY = num("delay", 0);
        const UP = str("direction", "down") === "up" ? -1 : 1; // +1: back cards peek out above
        const RADIUS = (num("borderRadius", 0) * REF) / 1080;
        const IMAGES = pick(num("imageCount", 16));
        const N = IMAGES.length;
        const STEPS = N * CYCLES;
        const RISE = lerpP(0.053, 0.0405) * REF; // top edge climb per level (S01 27px, S03 20.7px @512)
        const bezier = (x1, y1, x2, y2) => (x) => {
          if (x <= 0) return 0;
          if (x >= 1) return 1;
          let lo = 0,
            hi = 1,
            s = 0.5;
          for (let i = 0; i < 24; i++) {
            s = (lo + hi) / 2;
            const bx = 3 * (1 - s) * (1 - s) * s * x1 + 3 * (1 - s) * s * s * x2 + s * s * s;
            if (bx < x) lo = s;
            else hi = s;
          }
          return 3 * (1 - s) * (1 - s) * s * y1 + 3 * (1 - s) * s * s * y2 + s * s * s;
        };
        const smooth = bezier(0.5, 0, 0.5, 1);
        const sizeAt = (L) => S * Math.max(0.2, 1 - RA * L - RB * L * L);

        document.getElementById("loop-stack-3-loop").dataset.duration = DUR;
        background(document.getElementById("loop-stack-3-bg"));
        const stage = document.getElementById("loop-stack-3-stage");
        // group bbox at rest: front bottom .. back top; centre it
        const backTop = -S / 2 - RISE * (VIS - 1) + (S - sizeAt(VIS - 1)) * 0; // top of back card relative to front centre
        const groupCentre = (backTop + S / 2) / 2; // front bottom = +S/2
        const yShift = -groupCentre * UP + OY;
        const cards = [];
        for (let i = 0; i <= VIS; i++) {
          // VIS + 1: the fading front plus the stack
          const el = document.createElement("div");
          el.className = "card";
          el.style.borderRadius = RADIUS + "px";
          const img = document.createElement("img");
          el.appendChild(img);
          stage.appendChild(el);
          cards.push({ el, img, src: null });
        }
        function place(c, m, L, op) {
          const size = sizeAt(L);
          const a = aspect(m, FIT, CROP_AR);
          const w = size * Math.min(1, a),
            h = size * Math.min(1, 1 / a);
          if (c.src !== m.src) {
            c.img.src = m.src;
            c.src = m.src;
          }
          c.el.style.display = op <= 0 ? "none" : "";
          c.el.style.opacity = Math.min(1, op);
          c.el.style.width = w + "px";
          c.el.style.height = h + "px";
          // level L: top edge RISE*L above the front's top edge (down) / below its bottom edge (up)
          const top = UP > 0 ? -S / 2 - RISE * L : S / 2 + RISE * L - h;
          c.el.style.transform = `translate(${OX - w / 2}px, ${top + yShift}px)`;
        }
        function renderAt(t) {
          const g = frac(t + DELAY / DUR) * STEPS,
            k = Math.floor(g),
            tau = g - k;
          const e = smooth(tau);
          // draw back to front: level VIS (fading in), VIS-1 .. 1, then the leaving front (level -e)
          const fin = Math.max(0, Math.min(1, (tau - 0.635) / 0.22));
          const opIn = 1 - (1 - fin) * (1 - fin);
          place(cards[0], IMAGES[(k + VIS) % N], VIS - e, opIn);
          for (let m = VIS - 1; m >= 1; m--) place(cards[VIS - m], IMAGES[(k + m) % N], m - e, 1);
          const opOut = 1 - Math.max(0, Math.min(1, (e - 0.5 + STAG / 2) / Math.max(STAG, 0.005)));
          place(cards[VIS], IMAGES[k % N], -e, opOut);
        }
        // one paused linear tween drives t; every frame is recomputed from t alone (seek-safe)
        const state = { t: 0 };
        const tl = gsap.timeline({ paused: true });
        tl.to(state, { t: 1, duration: DUR, ease: "none", onUpdate: () => renderAt(state.t) }, 0);
        renderAt(0);
        window.__timelines = window.__timelines || {};
        window.__timelines["loop-stack-3"] = tl;
      })();
    </script>
  </body>
</html>
```

</Accordion>

{/* hf:generated-footer */}

Tagged `loop` `images` `showcase` `gallery` `stack` `3d`.

Created by Miao Yang.

## Related topics

- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)