> ## Documentation Index
> Fetch the complete documentation index at: https://hyperframes.heygen.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Match Cut

> A circle accelerates into a hard single-frame scene swap, matches the incoming circle exactly, and continues into a smaller resting pose.

export const InstallCommand = ({command}) => {
  const [copied, setCopied] = React.useState(false);
  const copy = async () => {
    try {
      if (navigator.clipboard && window.isSecureContext) {
        await navigator.clipboard.writeText(command);
      } else {
        const previous = document.activeElement;
        const scratch = document.createElement("textarea");
        scratch.value = command;
        scratch.setAttribute("readonly", "");
        scratch.style.position = "fixed";
        scratch.style.opacity = "0";
        document.body.appendChild(scratch);
        scratch.select();
        document.execCommand("copy");
        document.body.removeChild(scratch);
        previous?.focus?.();
      }
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {}
  };
  return <div className="hf-install-command not-prose my-4 flex items-stretch overflow-hidden rounded-xl border border-zinc-200 bg-zinc-50 dark:border-zinc-800 dark:bg-zinc-900">
      <code className="flex-1 overflow-x-auto whitespace-nowrap border-r border-zinc-200 px-4 py-3 font-mono text-sm text-zinc-800 dark:border-zinc-800 dark:text-zinc-100">
        {command}
      </code>
      <button type="button" onClick={copy} data-copied={copied ? "true" : "false"} aria-label={`Copy ${command} to the clipboard`} className="hf-install-copy">
        <svg className="hf-install-copy-clipboard" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M14.25 5.25H7.25C6.14543 5.25 5.25 6.14543 5.25 7.25V14.25C5.25 15.3546 6.14543 16.25 7.25 16.25H14.25C15.3546 16.25 16.25 15.3546 16.25 14.25V7.25C16.25 6.14543 15.3546 5.25 14.25 5.25Z" />
          <path d="M2.80103 11.998L1.77203 5.07397C1.61003 3.98097 2.36403 2.96397 3.45603 2.80197L10.38 1.77297C11.313 1.63397 12.19 2.16297 12.528 3.00097" />
        </svg>
        <svg className="hf-install-copy-check" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M2.75 9.5L6.5 13.25L15.25 4.5" />
        </svg>
      </button>
      <span className="hf-install-copy-status" role="status" aria-live="polite">
        {copied ? "Copied" : ""}
      </span>
    </div>;
};

<iframe className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800" title="match-cut preview" loading="lazy" srcDoc={`<!doctype html><html><head><meta charset="utf-8"><style>html,body{margin:0;height:100%;overflow:hidden;background:transparent}hyperframes-player{display:block;width:100%;height:100%}</style><script src="https://cdn.jsdelivr.net/npm/@hyperframes/player@0.7/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/components/match-cut.json").then(function(r){return r.json()}).then(function(d){var p=document.createElement("hyperframes-player");p.setAttribute("srcdoc",d.html);p.setAttribute("controls","");p.setAttribute("autoplay","");p.setAttribute("loop","");p.setAttribute("muted","");p.setAttribute("poster","https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/match-cut.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add match-cut" />

That writes one file: `compositions/components/match-cut.html`.

## Paste it into your composition

Open `compositions/components/match-cut.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                         |
| --------- | ------- | ------------------------- | ------------------------------------ |
| `accent`  | `green` | `green`, `blue`, `violet` | Color shared by the matched circles. |
| `label_a` | `Start` | string                    | Text inside the outgoing button.     |
| `label_b` | `Done`  | string                    | Result text revealed after the cut.  |

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 theme={null}
<div
  data-composition-id="match-cut"
  data-composition-src="compositions/components/match-cut.html"
  data-variable-values='{"accent":"green","label_a":"Start","label_b":"Done"}'
></div>
```

## Source

<Accordion title={`match-cut.html`}>
  ```html theme={null}
  <!doctype html>
  <!--
    match-cut: HyperFrames video primitive (transitions / match-cut / connect)

    Concept: scene A drives a circle into a known center-frame geometry, then a
    hard single-frame swap reveals scene B with a different circle in the exact
    same geometry. Scene B begins shrinking immediately, so the cut lands while
    the matched shape is moving rather than on a settled pose.

    Variables:
      - accent (green | blue | violet, default green): matched-circle color.
      - label_a (string, default "Start"): scene A button label.
      - label_b (string, default "Done"): scene B result label.

    Envelope (fixed IN/OUT, elastic HOLD only, never timeScale):
      IN_BASE  = 2.35s  scene A enters and accelerates into the hard cut, then
                 scene B decelerates into place while its content reveals
      HOLD     = elastic = max(0, D - (IN_BASE + OUT_BASE)); the matched circle
                 drifts subtly so a longer mount stays alive
      OUT_BASE = 0.50s  the completed scene fades cleanly
      If D is shorter than IN_BASE + OUT_BASE, IN and OUT compress together and
      HOLD becomes zero.

    Sync point: hard-cut occurs at CUT_AT = 1.40s in the default four-second
    duration, exactly frame 42 at 30 fps. Scene A opacity becomes 0 and scene B
    opacity becomes 1 at the same timeline instant. There is no crossfade.

    Mount contract: this is a template-wrapped sub-composition. The root has no
    data-width or data-height, fills its host box, uses container query units,
    and registers one paused timeline under the literal match-cut key.
  -->
  <html
    lang="en"
    data-composition-id="match-cut"
    data-composition-duration="4"
    data-composition-variables='[
      { "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Color shared by the matched circles.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
      { "id": "label_a", "type": "string", "role": "content", "label": "Scene A label", "description": "Text inside the outgoing button.", "default": "Start" },
      { "id": "label_b", "type": "string", "role": "content", "label": "Scene B label", "description": "Result text revealed after the cut.", "default": "Done" }
    ]'
  >
    <head>
      <meta charset="UTF-8" />
      <title>Match Cut</title>
    </head>
    <body>
      <template>
        <div id="root" data-composition-id="match-cut" data-duration="4" data-fps="30">
          <style>
            *,
            *::before,
            *::after {
              box-sizing: border-box;
            }

            #root {
              position: absolute;
              inset: 0;
              overflow: hidden;
              container-type: size;
              isolation: isolate;
              color: #f8fafc;
              font-family: Inter, system-ui, sans-serif;
              pointer-events: none;
            }

            .mc-clip,
            .mc-shell,
            .mc-scene {
              position: absolute;
              inset: 0;
              overflow: hidden;
            }

            .mc-scene {
              display: grid;
              place-items: center;
            }

            .mc-scene-a {
              background: radial-gradient(circle at 50% 50%, #182032 0%, #0b0f18 68%);
            }

            .mc-scene-b {
              background: radial-gradient(circle at 50% 44%, #202b42 0%, #0d121d 72%);
              opacity: 0;
            }

            /* Both actors share this one geometry owner. At the cut, each is
               centered at scale 1, so their painted circles match exactly. */
            .mc-circle {
              display: grid;
              place-items: center;
              width: 32cqmin;
              aspect-ratio: 1;
              border-radius: 50%;
              background: var(--mc-accent, #4ade80);
              box-shadow: 0 3.2cqh 8cqh color-mix(in srgb, var(--mc-accent, #4ade80) 30%, transparent);
              transform-origin: 50% 50%;
              will-change: transform;
            }

            .mc-label-a {
              display: block;
              max-width: 78%;
              overflow: hidden;
              color: #081018;
              font-size: 5.2cqmin;
              font-weight: 780;
              letter-spacing: -0.035em;
              line-height: 1;
              text-overflow: ellipsis;
              white-space: nowrap;
            }

            .mc-circle-b {
              color: #081018;
            }

            .mc-check {
              width: 34%;
              height: 22%;
              border-left: 2.4cqmin solid currentColor;
              border-bottom: 2.4cqmin solid currentColor;
              transform: translateY(-8%) rotate(-45deg);
            }

            .mc-copy-b {
              position: absolute;
              top: 69%;
              left: 12cqw;
              right: 12cqw;
              display: flex;
              flex-direction: column;
              align-items: center;
              gap: 1.6cqh;
              text-align: center;
            }

            .mc-kicker,
            .mc-label-b {
              opacity: 0;
            }

            .mc-kicker {
              color: color-mix(in srgb, var(--mc-accent, #4ade80) 76%, #f8fafc);
              font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
              font-size: 2.1cqmin;
              font-weight: 700;
              letter-spacing: 0.18em;
              text-transform: uppercase;
            }

            .mc-label-b {
              display: block;
              max-width: 74cqw;
              overflow: hidden;
              color: #f8fafc;
              font-size: 6.8cqmin;
              font-weight: 760;
              letter-spacing: -0.04em;
              line-height: 1.05;
              text-overflow: ellipsis;
              white-space: nowrap;
            }
          </style>

          <div
            id="match-cut-clip"
            class="mc-clip clip"
            data-start="0"
            data-duration="4"
            data-track-index="0"
          >
            <div class="mc-shell">
              <section class="mc-scene mc-scene-a" aria-label="Outgoing scene">
                <div class="mc-circle mc-circle-a">
                  <span class="mc-label-a"></span>
                </div>
              </section>

              <section class="mc-scene mc-scene-b" aria-label="Incoming scene">
                <div class="mc-circle mc-circle-b" aria-hidden="true">
                  <span class="mc-check"></span>
                </div>
                <div class="mc-copy-b">
                  <span class="mc-kicker">Match complete</span>
                  <span class="mc-label-b"></span>
                </div>
              </section>
            </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");
              var shell = root.querySelector(".mc-shell");
              var sceneA = root.querySelector(".mc-scene-a");
              var sceneB = root.querySelector(".mc-scene-b");
              var circleA = root.querySelector(".mc-circle-a");
              var circleB = root.querySelector(".mc-circle-b");
              var labelA = root.querySelector(".mc-label-a");
              var labelB = root.querySelector(".mc-label-b");
              var revealB = root.querySelectorAll(".mc-kicker, .mc-label-b");
              var vars =
                window.__hyperframes && window.__hyperframes.getVariables
                  ? window.__hyperframes.getVariables()
                  : {};

              var accentName =
                vars.accent === "blue" || vars.accent === "violet" ? vars.accent : "green";
              var accents = { green: "#4ade80", blue: "#60a5fa", violet: "#a78bfa" };
              var labelAText = vars.label_a == null ? "Start" : String(vars.label_a);
              var labelBText = vars.label_b == null ? "Done" : String(vars.label_b);

              root.style.setProperty("--mc-accent", accents[accentName]);
              labelA.textContent = labelAText;
              labelB.textContent = labelBText;

              var IN_BASE = 2.35;
              var OUT_BASE = 0.5;
              var CUT_AT_BASE = 1.4;
              var A_APPROACH_BASE = 0.45;
              var B_SETTLE_BASE = 0.65;
              var COPY_DELAY_BASE = 0.1;
              var COPY_IN_BASE = 0.55;

              var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
              var envelopeBase = IN_BASE + OUT_BASE;
              var phaseScale = duration < envelopeBase ? duration / envelopeBase : 1;
              var IN = IN_BASE * phaseScale;
              var OUT = OUT_BASE * phaseScale;
              var CUT_AT = CUT_AT_BASE * phaseScale;
              var A_APPROACH = A_APPROACH_BASE * phaseScale;
              var B_SETTLE = B_SETTLE_BASE * phaseScale;
              var COPY_DELAY = COPY_DELAY_BASE * phaseScale;
              var COPY_IN = COPY_IN_BASE * phaseScale;
              var HOLD = Math.max(0, duration - IN - OUT);
              var HOLD_START = IN;
              var OUT_START = IN + HOLD;

              var tl = gsap.timeline({ paused: true });

              tl.set(shell, { opacity: 0 }, 0);
              tl.set(sceneA, { opacity: 1 }, 0);
              tl.set(sceneB, { opacity: 0 }, 0);
              tl.set(circleA, { scale: 0.54 }, 0);
              tl.set(circleB, { scale: 1, y: 0 }, 0);
              tl.set(revealB, { opacity: 0, y: "2.4cqh" }, 0);

              tl.to(shell, { opacity: 1, duration: Math.min(0.3, IN), ease: "power2.out" }, 0);
              tl.to(circleA, { scale: 0.64, duration: A_APPROACH, ease: "power3.out" }, 0);
              tl.to(
                circleA,
                {
                  scale: 1,
                  duration: Math.max(0, CUT_AT - A_APPROACH),
                  ease: "power4.in",
                },
                A_APPROACH,
              );

              // HARD CUT: both opacity states change at the exact same instant.
              tl.set(sceneA, { opacity: 0 }, CUT_AT);
              tl.set(sceneB, { opacity: 1 }, CUT_AT);

              // Scene B starts at the matching geometry and leaves the cut at
              // peak speed, then decelerates into its smaller resting pose.
              tl.to(circleB, { scale: 0.74, duration: B_SETTLE, ease: "power4.out" }, CUT_AT);
              tl.to(
                revealB,
                {
                  opacity: 1,
                  y: 0,
                  duration: COPY_IN,
                  stagger: 0.08 * phaseScale,
                  ease: "power3.out",
                },
                CUT_AT + COPY_DELAY,
              );

              if (HOLD > 0) {
                tl.to(
                  circleB,
                  {
                    y: "-0.8cqh",
                    duration: HOLD / 2,
                    ease: "sine.inOut",
                    yoyo: true,
                    repeat: 1,
                  },
                  HOLD_START,
                );
              }

              tl.to(shell, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);

              tl.seek(0);
              window.__timelines = window.__timelines || {};
              window.__timelines["match-cut"] = tl;
            })();
          </script>
        </div>
      </template>
    </body>
  </html>
  ```
</Accordion>

Tagged `motion-primitive` `transition` `match-cut` `hard-cut` `continuity`.

## Related topics

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


## Related topics

- [Type Match Cut](/catalog/components/type-match-cut.md)
- [Motion that reads premium](/prompting/motion.md)
- [Transitions](/prompting/transitions.md)
