# removeAnimation(forKey:fadeOutDuration:) Removes the animation attached to the object with the specified key, smoothly transitioning out of the animation’s effect. ``` func removeAnimation(forKey key: String, fadeOutDuration duration: CGFloat) ``` ## Parameters `key` A string identifying an attached animation to remove. `duration` The duration for transitioning out of the animation’s effect before it is removed. ## Discussion Use this method to create smooth transitions between the effects of multiple animations. For example, the geometry loaded from a scene file for a game character may have associated animations for player actions such as walking and jumping. When the player lands from a jump, you remove the jump animation so the character continues walking. If you use the [`removeAnimation(forKey:)`](/documentation/SceneKit/SCNAnimatable/removeAnimation(forKey:)) method to remove the jump animation, SceneKit abruptly switches from the current frame of the jump animation to the current frame of the walk animation. If you use the [`removeAnimation(forKey:fadeOutDuration:)`](/documentation/SceneKit/SCNAnimatable/removeAnimation(forKey:fadeOutDuration:)) method instead, SceneKit plays both animations at once during that duration and interpolates vertex positions from one animation to the other, creating a smooth transition. --- 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)