---
title: utils.curvesIntersect()
---
The `utils.curvesIntersect()` function finds the intersections between two curves
described by 4 points each.
:::warning
This function can sometimes fail to find intersections in some curves
due to a limitation in an underlying Bézier library.
Please see [Bug #3367](https://github.com/freesewing/freesewing/issues/3367)
for more information.
:::
## Signature
```js
array | Point | false utils.curvesIntersect(
Point startA,
Point Cp1A,
Point Cp2A,
Point endA,
Point startB,
Point Cp1B,
Point Cp2B,
Point endB)
```
This returns `false` if no intersections are found,
a [Point](/reference/api/point) object if
a single intersection is found, and an array
of [Point](/reference/api/point) objects if
multiple intersections are found.
## Example
<Example caption="A Utils.curvesIntersect() example">
```js
({ Point, points, Path, paths, Snippet, snippets, utils, getId, part }) => {
points.A = new Point(10, 10)
points.Acp = new Point(310, 40)
points.B = new Point(110, 70)
points.Bcp = new Point(-210, 40)
points.C = new Point(20, -5)
points.Ccp = new Point(60, 300)
points.D = new Point(100, 85)
points.Dcp = new Point(70, -220)
paths.curveA = new Path()
.move(points.A)
.curve(points.Acp, points.Bcp, points.B)
paths.curveB = new Path()
.move(points.C)
.curve(points.Ccp, points.Dcp, points.D)
const intersections = utils.curvesIntersect(
points.A,
points.Acp,
points.Bcp,
points.B,
points.C,
points.Ccp,
points.Dcp,
points.D
)
if (intersections) {
if (intersections instanceof Array) {
for (const p of intersections)
snippets[getId()] = new Snippet('notch', p)
} else {
snippets[getId()] = new Snippet('notch', intersections)
}
}
return part
}
```
</Example>
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