# contactNormal The normal vector at the contact point between the two physics bodies, in scene coordinates. ``` var contactNormal: SCNVector3 { get } ``` ## Discussion This vector tells you which direction the bodies were moving relative to one another at the time of the collision. For example, in a game you can examine this vector to have enemy characters take damage when struck from above by the player character but damage the player character instead when they collide side-to-side. --- 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)