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Revert "feat(registry): the video-primitive moves, documented and customisable (#3090)" (#3162)

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This reverts commit 3b53bfd2f7.
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Miguel Ángel
2026-08-10 14:47:47 -04:00
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registry/components/cut-the-curve/README.md
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# cut-the-curve
A velocity-matched directional hard cut. The outgoing subject accelerates along one straight screen vector with `power4.in`; at peak velocity the timeline swaps identities; the incoming subject continues on the same vector and decelerates to rest with `power4.out`. Matched blur and opacity conceal the seam.
Transition profile: no elastic HOLD; retime by changing the mount duration only (0.3s to 3s).
## Variables
| id | type | default | notes |
| ------------- | ------ | -------- | ------------------------------------------------------------------------------------------------------------------------------- |
| `subject` | enum | `cursor` | `cursor`, `card`, or `scene`: the visual payload on both sides of the cut. |
| `direction` | enum | `left` | `left`, `right`, `up`, `down`: the shared travel vector. |
| `cutFraction` | number | `0.33` | Normalized point of the hard cut. The incoming distance derives from it so seam velocity stays matched. |
| `blurPx` | number | `12` | Blur shared by both subjects at the seam. |
| `exit` | enum | `none` | `none` rests until the cut; `fade`/`up` depart the incoming subject over a reserved tail (min(0.35s, 25% of D)) after it lands. |
## Mount
```html
<div
class="clip"
data-composition-id="cut-the-curve"
data-composition-src="./cut-the-curve.html"
data-variable-values='{"subject":"card","direction":"right","cutFraction":0.33}'
data-start="0"
data-duration="1"
data-track-index="0"
></div>
```
Elastic root: no `data-width`/`data-height`; it fills whatever box the host clip gives it. Timeline registers under the literal `cut-the-curve` key.
## Notes
- Sync point: the cut lands at `(D - exit tail) * cutFraction`; a `whip-cut` `hf:sfx` CustomEvent fires there for the scene mix stage.
- Invariants: one shared vector, identity swap only at the cut, matched blur/opacity at the seam. Never split the two halves into independently tuned velocities.