---
title: "GLKMathUnproject(_:_:_:_:_:)"
framework: GLKit
role: symbol
role_heading: Function
platforms: [iOS 5.0+, iPadOS 5.0+, macOS 10.8+, tvOS 9.0+]
path: "glkit/glkmathunproject(_:_:_:_:_:)"
---

# GLKMathUnproject(_:_:_:_:_:)

Projects a point in view space into object space.

## Declaration

```swift
func GLKMathUnproject(_ window: GLKVector3, _ model: GLKMatrix4, _ projection: GLKMatrix4, _ viewport: UnsafeMutablePointer<Int32>, _ success: UnsafeMutablePointer<Bool>?) -> GLKVector3
```

## Parameters

- `window`: The point in window coordinates.
- `model`: A modelview transformation matrix.
- `projection`: A projection matrix.
- `viewport`: A pointer to an array of four integer values. The first pair of values represent the window coordinates of the viewport’s bottom left corner. The second pair of values represent the width and height of the view port.
- `success`: Upon return, contains doc://com.apple.documentation/documentation/Swift/true if the function completed successfully, otherwise it contains doc://com.apple.documentation/documentation/Swift/false. Pass NULL if you do not want error information.

## Return Value

Return Value The projected point in object space.

## See Also

### Projecting Vectors

- [GLKMathProject(_:_:_:_:)](glkit/glkmathproject(_:_:_:_:).md)