# enumerateChildObjects(of:root:using:stopPointer:) Executes the specified block using each object in this object’s child hierarchy. ``` func enumerateChildObjects(of objectClass: AnyClass, root: MDLObject, using block: @escaping (MDLObject, UnsafeMutablePointer) -> Void, stopPointer: UnsafeMutablePointer) ``` ## Parameters `objectClass` A Model I/O class representing a type of child objects to evaluate. For example, pass the [`MDLMesh`](/documentation/ModelIO/MDLMesh) class to evaluate all 3D objects stored in the asset. Pass the [`MDLObject`](/documentation/ModelIO/MDLObject) class to evaluate all child objects regardless of type. `root` The root object at which to begin traversing the child object hierarchy. `block` The block to apply to child objects. This block takes two parameters: the `object` to be evaluated by the block, and a `stop` pointer that you can set to to stop further evaluation of the object hierarchy. `stopPointer` Set this pointer’s value to during enumeration to stop further enumeration of the object hierarchy. --- 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)