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# unprojectPoint(_:ontoPlane:)

Returns the projection of a point from 2D view onto a plane in the 3D world space detected by ARKit.

```
@MainActor @nonobjc @preconcurrency func unprojectPoint(_ point: CGPoint, ontoPlane planeTransform: simd_float4x4) -> simd_float3?
```

## Parameters

`point`

A point in the 2D coordinate system of the view to project onto a plane.

`planeTransform`

A transform matrix specifying the position and orientation of a plane (with infinite extent) in 3D world space. The plane is the xz-plane of the local coordinate space this transform defines.

## Return Value

The 3D point in world space where a ray projected from the specified 2D point intersects the specified plane. If the ray does not intersect the plane, this method returns `nil`.

---

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