# contactTest(with:options:) Checks for contacts between one physics body and any other bodies in the physics world. ``` func contactTest(with body: SCNPhysicsBody, options: [SCNPhysicsWorld.TestOption : Any]? = nil) -> [SCNPhysicsContact] ``` ## Parameters `body` The body to test for contact. `options` A dictionary of options affecting the test, or `nil` to use default options. For applicable keys and the possible values, see `Physics Test Options Keys`. ## Return Value An array of [`SCNPhysicsContact`](/documentation/SceneKit/SCNPhysicsContact) objects describing contacts between the specified body and any others, or `nil` if the body is not in contact with any other bodies. ## Discussion SceneKit sends messages to the physics world’s contactdelegate object only when collisions occur between bodies whose [`collisionBitMask`](/documentation/SceneKit/SCNPhysicsBody/collisionBitMask) and [`categoryBitMask`](/documentation/SceneKit/SCNPhysicsBody/categoryBitMask) properties overlap, and only for collisions between certain types of bodies. (For details, see [`SCNPhysicsBodyType`](/documentation/SceneKit/SCNPhysicsBodyType).) Use this method to directly test for all contacts between one body and any other bodies at a time of your choosing. For example, to implement a game with a “wall jump” effect, you could call this method when the player presses the jump button to see if the player character is in contact with any walls. --- 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)