# GLKMatrix3Invert(_:_:) Returns the inverse of a matrix. ``` func GLKMatrix3Invert(_ matrix: GLKMatrix3, _ isInvertible: UnsafeMutablePointer!) -> GLKMatrix3 ``` ## Parameters `matrix` A matrix. `isInvertible` On return, this holds if the matrix was inverted or if the matrix is not invertible. ## Return Value If `isInvertible` was set to , this holds an inverted matrix. Otherwise, the identity matrix is returned. --- 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)