# unprojectPoint(_:) Unprojects a point from the SpriteKit node’s 2D viewport coordinate system to the 3D world coordinate system of the SceneKit scene. ``` func unprojectPoint(_ point: vector_float3) -> vector_float3 ``` ## Parameters `point` A point in the SpriteKit node’s coordinate system. ## Return Value The corresponding point in the world coordinate system of the SceneKit scene. ## Discussion The z-coordinate of the `point` parameter describes the depth at which to unproject the point relative to the near and far clipping planes of the viewing frustum (defined by the [`SK3DNode`](/documentation/SpriteKit/SK3DNode) property). Unprojecting a point whose z-coordinate is `0.0` returns a point on the near clipping plane; unprojecting a point whose z-coordinate is `1.0` returns a point on the far clipping plane. A point in the SpriteKit node’s 2D viewport coordinate space can refer to any point along a line segment in the 3D SceneKit coordinate space. To test for scene contents along this line—for example, to find the geometry corresponding to a touch event—use the [`SK3DNode`](/documentation/SpriteKit/SK3DNode) method. The following Swift code shows how you might convert the location of an iOS touch event inside an [`SK3DNode`](/documentation/SpriteKit/SK3DNode), `node`, to the 3D coordinates within its SceneKit scene. The resulting value, `sceneKitCoordinates`, is given a `z` of `0.5`, meaning that the coordinate is midway between the near and far clipping planes. You could use this value to set the position of an object within the SceneKit scene. ```swift override func touchesMoved(_ touches: Set, with event: UIEvent?) { guard let touch = touches.first else { return } let location = touch.location(in: node) let scale = Float(UIScreen.main.scale) let sceneKitCoordinates = node.unprojectPoint(vector_float3(Float(location.x) * scale, Float(location.y) * scale, 0.5)) } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)