heygen-com--hyperframes/skills/hyperframes-animation/rules/depth-scatter-assemble.md

name, description, metadata

name	description	metadata
depth-scatter-assemble	N elements scatter into / reassemble from a rotating 3D depth-cloud, each starting at a deterministic index-derived 3D offset and settling to a clean flat layout.	tags 3d, scatter, assemble, depth, cloud, tumble, kinetic, letter, fragment, logo, reassemble

Depth Scatter ↔ Assemble

N elements (glyphs, cards, icons, logo fragments) fly in from a rotating 3D depth-cloud and lock into a clean on-screen layout — or the reverse. Each element starts at a deterministic 3D offset (translateZ depth + rotateX/rotateY + an x/y scatter derived from its index), then tweens to its assembled flat position (z: 0, rotation: 0). Because every scattered position is computed by trig on the element's index — never Math.random — it renders identically every frame.

Distinct from orbit-3d-entry (flip-in then a continuous orbit) and center-outward-expansion (a flat 2D burst from one shared center): here each element has its own point in a 3D cloud, and the resolve is a flat assembled layout, not an orbit or a radial spray.

How It Works

Each element resolves to a flat layout position (targetX/Y, set once in CSS or via data-*). Its scattered state is derived from its index i:

const GOLDEN = Math.PI * (3 - Math.sqrt(5)); // ~2.39943 rad — even angular spread, no clumping
const a = i * GOLDEN; // this element's angle in the cloud
const scatterX = Math.cos(a) * RADIUS; // index-derived, deterministic
const scatterY = Math.sin(a) * RADIUS;
const scatterZ = Z_NEAR - (i / (n - 1)) * (Z_NEAR - Z_FAR); // stepped depth across the cloud
const rotX = Math.sin(a) * TUMBLE; // tumble orientation, also from the angle
const rotY = Math.cos(a) * TUMBLE;

A single 0→1 progress proxy interpolates each element between scattered and assembled (lerp every channel). At progress = 0 the elements form the depth-cloud; at progress = 1 they sit flat in the layout. Run it forward and it's assemble; the cloud itself slowly rotates (a stage rotateY tween) so the scatter has life before it locks.

Requires perspective on the stage and transform-style: preserve-3d on the stage AND each element, or the z-depth and tumble flatten to a 2D scale.

HTML

<div
  class="scene"
  id="assemble-scene"
  data-composition-id="assemble-scene"
  data-start="0"
  data-duration="4"
  data-track-index="0"
>
  <!-- The cloud rotates; the layout lives inside it. targetX/Y = each
       element's FLAT assembled offset from stage center (px). -->
  <div class="cloud-stage">
    <div class="frag" data-target-x="-260" data-target-y="0">{glyph1}</div>
    <div class="frag" data-target-x="-130" data-target-y="0">{glyph2}</div>
    <div class="frag" data-target-x="0" data-target-y="0">{glyph3}</div>
    <div class="frag" data-target-x="130" data-target-y="0">{glyph4}</div>
    <div class="frag" data-target-x="260" data-target-y="0">{glyph5}</div>
  </div>
</div>

For a logo lockup, targetX/Y describe the parts' resting layout; for kinetic type, one .frag per glyph (inject spans from the phrase string at setup so width is exact — see Variations).

CSS

.scene {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  background: {bgColor};
  perspective: 1400px; /* REQUIRED — without it, z-depth + tumble read as flat 2D scale */
}
.cloud-stage {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  transform-style: preserve-3d; /* REQUIRED — preserves child 3D context */
  will-change: transform;
}
.frag {
  position: absolute;
  /* Live at stage center; GSAP translates each one to its layout / cloud point. */
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  font-family: {font};
  font-weight: 900;
  font-size: 120px;
  color: {textColor};
  transform-style: preserve-3d; /* each fragment keeps its own 3D context */
  backface-visibility: hidden; /* hides the mirrored face mid-tumble */
  will-change: transform, opacity;
}

GSAP Timeline

<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
  window.__timelines = window.__timelines || {};
  const tl = gsap.timeline({ paused: true });

  const frags = Array.from(document.querySelectorAll(".frag"));
  const n = frags.length;
  const GOLDEN = Math.PI * (3 - Math.sqrt(5)); // ~2.39943 — even spread, no clumps

  // RADIUS, Z_NEAR, Z_FAR, TUMBLE, ASSEMBLE_DUR, ASSEMBLE_EASE, STAGGER,
  // CLOUD_SPIN_DEG, CLOUD_SPIN_DUR — named constants per "How to Choose Values".

  // Precompute each fragment's deterministic scattered state from its index.
  const scatter = frags.map((el, i) => {
    const a = i * GOLDEN;
    const depthT = n > 1 ? i / (n - 1) : 0;
    return {
      x: Math.cos(a) * RADIUS,
      y: Math.sin(a) * RADIUS,
      z: Z_NEAR - depthT * (Z_NEAR - Z_FAR),
      rotationX: Math.sin(a) * TUMBLE,
      rotationY: Math.cos(a) * TUMBLE,
    };
  });

  // 1) Park every fragment in the cloud BEFORE any tween fires.
  frags.forEach((el, i) => {
    const s = scatter[i];
    gsap.set(el, {
      xPercent: -50,
      yPercent: -50, // bake self-centering so x/y are offsets from stage center
      x: s.x,
      y: s.y,
      z: s.z,
      rotationX: s.rotationX,
      rotationY: s.rotationY,
      opacity: 0,
    });
  });

  // 2) The cloud rotates so the scatter has life before / during assembly.
  tl.to(
    ".cloud-stage",
    { rotationY: CLOUD_SPIN_DEG, duration: CLOUD_SPIN_DUR, ease: "power1.out" },
    0,
  );

  // 3) ASSEMBLE — each fragment tweens from its cloud point to its flat target.
  frags.forEach((el, i) => {
    tl.to(
      el,
      {
        x: Number(el.dataset.targetX),
        y: Number(el.dataset.targetY),
        z: 0,
        rotationX: 0,
        rotationY: 0,
        opacity: 1,
        duration: ASSEMBLE_DUR,
        ease: ASSEMBLE_EASE, // out-ease — fragments fly in then settle
      },
      i * STAGGER, // index stagger reads as "cloud collapsing inward"
    );
  });

  window.__timelines["assemble-scene"] = tl;
</script>

Variations

Tumble-swap (mid-shot hand-off between two phrases)

The signature for kinetic-type-beats beat changes: one phrase's glyphs scatter into the cloud at the same moment the next phrase's glyphs assemble out of it — a 3D hand-off between two states, never an empty frame. Two glyph sets share the cloud; drive both with one shared 0→1 progress so they cross deterministically.

// outgoing[] and incoming[] are two glyph arrays, each with precomputed scatter[] (above).
const swap = { p: 0 };
tl.to(
  swap,
  {
    p: 1,
    duration: SWAP_DUR,
    ease: "power2.inOut",
    onUpdate: () => {
      const p = swap.p;
      outgoing.forEach((el, i) => {
        // 1 → 0: layout → cloud (scatters AWAY)
        const s = outScatter[i];
        const tx = Number(el.dataset.targetX);
        const ty = Number(el.dataset.targetY);
        el.style.opacity = String(1 - p);
        el.style.transform =
          `translate(-50%,-50%) translate3d(${tx + (s.x - tx) * p}px,${ty + (s.y - ty) * p}px,${s.z * p}px)` +
          ` rotateX(${s.rotationX * p}deg) rotateY(${s.rotationY * p}deg)`;
      });
      incoming.forEach((el, i) => {
        // 0 → 1: cloud → layout (assembles IN)
        const s = inScatter[i];
        const tx = Number(el.dataset.targetX);
        const ty = Number(el.dataset.targetY);
        el.style.opacity = String(p);
        el.style.transform =
          `translate(-50%,-50%) translate3d(${s.x + (tx - s.x) * p}px,${s.y + (ty - s.y) * p}px,${s.z * (1 - p)}px)` +
          ` rotateX(${s.rotationX * (1 - p)}deg) rotateY(${s.rotationY * (1 - p)}deg)`;
      });
    },
  },
  SWAP_AT,
);

Inject a per-glyph span set for each phrase at setup (so targetX per glyph is the exact laid-out advance width — measure after document.fonts.ready), and hide each set's opacity to 0 until its window.

Radial letter-explode → resolve

A flat-plane special case (the kinetic-type-beats "letters explode radially then resolve" GAP): set Z_NEAR = Z_FAR = 0 and TUMBLE small so the cloud is a 2D ring, then reverse the assemble for the explode — fragments fling out to scatter[i] then snap back to layout. Pure in-plane, no depth.

Scatter-OUT (final-frame exit only)

Reverse the assemble (layout → cloud, opacity 1→0) ONLY as the composition's last beat. A scatter-out mid-shot reads as an exit and breaks the shot — keep entrances and hand-offs as assemble or tumble-swap.

Parallax depth slide-in (logo lockup)

For logo-assemble-lockup, give back layers a larger |Z_FAR| and a longer ASSEMBLE_DUR, foreground parts a shallower depth and shorter duration — parts at different depths slide in at different apparent speeds (parallax) and lock into the lockup.

How to Choose Values

• n (ELEMENT_COUNT) — fragments / glyphs in the cloud

  • Range: 4–14 (glyph sets follow the word length; for fragments/cards stay 4–9)
  • Effects: few reads as deliberate assembly; many reads as a dense swarm condensing
  • Constraints: above ~14 the cloud crowds the center and individual paths stop reading

• RADIUS — cloud spread in the x/y plane, px

  • Range: 250–700 px
  • Effects: small = a tight knot that barely separates; large = fragments arrive from the frame edges
  • Constraints: keep the farthest scatter inside frame at the chosen perspective, or fragments pop in from off-screen with no travel read

• Z_NEAR / Z_FAR — depth band of the cloud, px (front / back)

  • Range: Z_NEAR +150 to +450; Z_FAR −150 to −500
  • Effects: a wide band (e.g. +400 / −400) gives strong fly-toward / recede-from camera depth; a narrow band keeps it nearly flat
  • Constraints: very large |z| against a short perspective over-distorts (fragments smear huge then tiny) — widen perspective to match

• TUMBLE — peak rotateX/rotateY of scattered fragments, deg

  • Range: 40–110°
  • Effects: low = fragments drift in nearly upright; high = they tumble through space and rotate upright on arrival
  • Constraints: with backface-visibility: hidden, glyphs past 90° show blank mid-tween (intended for the tumble); for cards with content on one face, cap near 80°

• ASSEMBLE_DUR — per-fragment cloud → layout tween, s

  • Range: 0.7–1.4 s
  • Effects: short = snappy lock-in; long = a floating condense
  • Constraints: (n − 1) × STAGGER + ASSEMBLE_DUR must fit the scene's assembly window

• ASSEMBLE_EASE — shared ease across fragments

  • Discrete choice: power3.out, expo.out, back.out(1.4)
  • Selection: power3.out default (fly in, settle). expo.out snaps hard at the end. back.out adds a small overshoot as parts seat. Avoid in easings — fragments look sucked backward into the cloud mid-air.

• STAGGER — gap between successive fragments' assembly starts, s

  • Range: 0.03–0.09 s
  • Effects: < 0.03 = a single chord (whole cloud collapses at once); > 0.09 = a slow drip that loses the "swarm" read
  • Constraints: n × STAGGER should stay below ASSEMBLE_DUR so the cloud is collapsing as one motion, not a queue

• CLOUD_SPIN_DEG / CLOUD_SPIN_DUR — stage rotateY over the assembly, deg / s

  • Range: 15–60° over a duration ≥ ASSEMBLE_DUR
  • Effects: a gentle spin gives the scatter life so it doesn't read as a frozen explosion diagram; too fast competes with the assembly
  • Constraints: keep finite and ending by settle — no repeat

• SWAP_DUR / SWAP_AT (tumble-swap) — hand-off length / when it fires, s

  • Range: SWAP_DUR 0.5–1.0 s; SWAP_AT on the beat boundary
  • Effects: shorter = a hard cross; longer = a visible dissolve-through-cloud
  • Constraints: outgoing and incoming MUST share one progress (one tween) so they cross at the same instant

Key Principles

• perspective on the scene root + preserve-3d on stage AND each fragment — without all three, z-depth and tumble collapse to a flat scale
• Every scattered value is index-derived — cos/sin(i × GOLDEN), stepped z by i/(n−1). The golden angle spreads points evenly with no clumps and (critically) no Math.random, so the cloud is byte-identical every render
• gsap.set the cloud BEFORE adding tweens — park each fragment at its scatter point with opacity: 0 first; the assemble tweens FROM there. Skipping the set leaves frame 0 showing the assembled layout, then a teleport when the first tween starts
• Resolve flat — the settled state is z: 0, rotationX: 0, rotationY: 0 in the layout. A cloud that resolves still-tilted reads as unfinished
• Assemble / hand-off only; scatter-OUT is an exit — fragments leaving for the cloud mid-shot reads as the shot ending. Use forward assemble for entrances, tumble-swap for beat changes; reserve scatter-out for the final frame
• Depth ordering is automatic — inside preserve-3d, paint order follows actual Z, so nearer fragments correctly occlude farther ones with no manual z-index (unlike the orbit case, where the orbit is faked in 2D and needs capped z-index)

Critical Constraints

• No Math.random / Date.now — derive every scatter coordinate from the index (golden-angle trig + stepped depth). This is the whole point of the rule: a randomized cloud renders differently each frame and the seek breaks
• No CSS transition — all motion is GSAP tweens on the paused timeline
• No repeat / yoyo / infinite — the cloud spin and every assemble are finite, one-shot tweens that end before settle
• Timeline must be paused: gsap.timeline({ paused: true })
• Registry key = data-composition-id
• Transform aliases only — x, y, z, scale, rotation/rotationX/rotationY. Never width/height/left/top; x/y compose with the xPercent/yPercent -50 self-centering
• will-change: transform on stage + fragments — many simultaneous 3D transforms benefit from compositor hints
• In tumble-swap, one shared progress for both glyph sets — two separate tweens can drift out of phase under seek and the cross stops looking like a single hand-off

Combinations

• orbit-3d-entry.md — alternative 3D entrance (settles into a continuous orbit instead of a flat lockup); shares the perspective + preserve-3d stage setup
• hacker-flip-3d.md — per-glyph 3D flip/decode as the fragments seat; layer for a "letters tumble in AND decode on arrival" read
• 3d-text-depth-layers.md — give the assembled wordmark a stacked extrusion once it locks
• center-outward-expansion.md — flat 2D cousin (single shared center, no depth) when perspective isn't wanted
• press-release-spring.md — a spring settle on the assembled lockup once the cloud resolves
• sine-wave-loop.md — idle breathe on the resolved layout instead of a frozen hold

Pairs with HF skills

• /hyperframes-animation — timeline + onUpdate API (the shared-progress tumble-swap)
• /hyperframes-core — composition wiring
• /hyperframes-cli — hyperframes lint