# computeDistance(_:to:) Computes the distance between two feature print observations. ``` func computeDistance(_ outDistance: UnsafeMutablePointer, to featurePrint: VNFeaturePrintObservation) throws ``` ## Parameters `outDistance` A pointer to store the calculated distance value. `featurePrint` The feature print object whose distance to calculate. ## Discussion Shorter distances indicate greater similarity between feature prints. --- 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)