使用 .loadModelAsync() 时可用动画集合为空

Question

我使用 LoadModelAsync 在我的 RealityKit 场景中成功地异步加载了 USDZ 文件。我正在使用苹果提供的 toy_biplane USDZ 文件，它具有默认动画。如果我异步加载模型，availableAnimations 数组总是空的！

我的代码：

func loadASingleModel(name: String, 
                completion: @escaping (_ model: ModelEntity?) -> Void) {
        
    var cancellable: AnyCancellable?
    cancellable = Entity.loadModelAsync(named: name)
        .sink(receiveCompletion: { handler in
            if case let .failure(error) = handler {
                print("Unable to load a model due to error \(error)")
            }
            cancellable?.cancel()
            completion(nil)

        }, receiveValue: { [self] (model: ModelEntity?) in
            if let model = model  {
                cancellable?.cancel()
                print("Congrats! Model is successfully loaded!")
                print(model.availableAnimations, 
                      //Here availableAnimations is empty
                      "Debug: Any Animation?")
                            completion(model)
            }
        })
    }
}

如何使用动画异步加载 USDZ 文件？

Answer 1

使用ModelEntity.loadAsync。它加载完整的层次结构，包括动画。

import RealityKit
import Combine

let anchor = AnchorEntity()
var cancellable: AnyCancellable? = nil


self.cancellable = ModelEntity.loadAsync(named: "biplane.usdz").sink(
        
    receiveCompletion: { completion in

        if case let .failure(error) = completion {
            print("Unable to load a model \(error)")
        }
        self.cancellable?.cancel()
    }, 

    receiveValue: { [self] planeModel in

        let animation = planeModel.availableAnimations[0]
            
        anchor.addChild(planeModel)
        anchor.position = [0, 0,-2]
        anchor.scale = [0.1, 0.1, 0.1]
        arView.scene.anchors.append(anchor)
                
        planeModel.playAnimation(animation.repeat(count: .max))
    }
)

使用 .loadModelAsync() 时可用动画集合为空

Available animations collection is empty, while using .loadModelAsync()

swift

realitykit