# init(url:transaction:content:) Loads and displays a modifiable model from the specified URL in phases. ``` nonisolated init(url: URL, transaction: Transaction = Transaction(), @ViewBuilder content: @escaping (Model3DPhase) -> Content) ``` ## Parameters `url` The URL of the image to display. `transaction` The transaction to use when the phase changes. `content` A closure that takes the load phase as an input, and returns the view to display for the specified phase. ## Discussion If you set the asynchronous model’s URL to `nil`, or after you set the URL to a value but before the load operation completes, the phase is [`Model3DPhase.empty`](/documentation/RealityKit/Model3DPhase/empty). After the operation completes, the phase becomes either [`Model3DPhase.failure(_:)`](/documentation/RealityKit/Model3DPhase/failure(_:)) or [`Model3DPhase.success(_:)`](/documentation/RealityKit/Model3DPhase/success(_:)). In the first case, the phase’s [`error`](/documentation/RealityKit/Model3DPhase/error) value indicates the reason for failure. In the second case, the phase’s [`model`](/documentation/RealityKit/Model3DPhase/model) property contains the loaded model. Use the phase to drive the output of the `content` closure, which defines the view’s appearance: ```swift let url = URL(string: "https://example.com/robot.usdz")! Model3D(url: url) { phase in if let model = phase.model { model // Displays the loaded model. } else if phase.error != nil { Color.red // Indicates an error. } else { Color.blue // Acts as a placeholder. } } ``` To add transitions when you change the URL, apply an identifier to the [`Model3D`](/documentation/RealityKit/Model3D). --- 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)