---
title: "unprojectPoint(_:ontoPlane:)"
framework: arkit
role: symbol
role_heading: Instance Method
path: "arkit/arscnview/unprojectpoint(_:ontoplane:)"
---

# unprojectPoint(_:ontoPlane:)

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

## Declaration

```swift
@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

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.

## See Also

### Mapping Content to Real-World Positions

- [anchor(for:)](arkit/arscnview/anchor(for:).md)
- [node(for:)](arkit/arscnview/node(for:).md)