# UnsafeForceEffectBuffer Provides access to physics body parameters from the effect’s update function or event handler. ``` struct UnsafeForceEffectBuffer ``` ## Overview This struct is a transient buffer view of underlying data, and is only available in effect’s update function or update closure. ## Topics ### Structures [`struct Iterator`](/documentation/RealityKit/UnsafeForceEffectBuffer/Iterator) Iterates over all elements of the `UnsafeForceEffectBuffer`. ### Instance Properties [`var count: Int`](/documentation/RealityKit/UnsafeForceEffectBuffer/count) Returns the number of elements in the buffer. ### Instance Methods [`func makeIterator() -> UnsafeForceEffectBuffer.Iterator`](/documentation/RealityKit/UnsafeForceEffectBuffer/makeIterator()) Returns an iterator for the sequence. ### Subscripts [`subscript(Int) -> T`](/documentation/RealityKit/UnsafeForceEffectBuffer/subscript(_:)) Returns an element by index. ## Relationships ### Conforms To [`Sequence`](/documentation/Swift/Sequence) --- 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)