ARKit / RealityKit - 实体的动画旋转

Question

我对 ARKit / RealityKit 相当陌生，我想为加载的 USDZ 模型的旋转设置动画。不幸的是，我无法让它工作。

guard let modelEntity = try? Entity.loadModel(named: "toy_biplane_idle") else {
      return
}
anchorEntity.addChild(modelEntity)
var rotationTransform: Transform = Transform()
rotationTransform.rotation = .init(angle: 30 * .pi / 180, axis: .init(x: 1, y: 1, z: 1))
// modelEntity.orientation = rotationTransform.rotation // this works but is not animated
modelEntity.move(to: rotationTransform, relativeTo: modelEntity.parent, duration: 1.0) // no effect at all

我尝试使用带有持续时间的

move(to:

方法，但它根本没有效果，既没有动画也没有任何旋转。我做错了什么？

Answer 1

在 iOS 中，您必须在将双翼飞机模型附加到场景后应用

move(..)

属性方法：

import SwiftUI
import RealityKit

struct ContentView : View {
    var body: some View {
        ARBiplaneView()
            .ignoresSafeArea()
    }
}
struct ARBiplaneView : UIViewRepresentable {
    let arView = ARView(frame: .zero)
    let anchor = AnchorEntity()
    
    func makeUIView(context: Context) -> ARView {
        let modelEntity = try! Entity.loadModel(named: "toy_biplane_idle")
        modelEntity.scale *= 4
        anchor.addChild(modelEntity)
    
        var transform: Transform = Transform()
        transform.translation.z = -2.0
        transform.rotation = .init(angle: .pi/2, axis: [0,1,0])
        
        // doesn't work here
        modelEntity.move(to: transform, relativeTo: modelEntity, duration: 5.0)

        arView.scene.anchors.append(anchor)
        
        // DOES WORK HERE
        modelEntity.move(to: transform, relativeTo: modelEntity, duration: 5.0)
        
        return arView
    }
    func updateUIView(_ view: ARView, context: Context) { }
}