我有一个自定义的usdz文件（不是通过代码创建的，但可以说是一把真正的椅子！）。我将其保存在Entity中。
一旦有了它，这就是我的代码：
func updateUIView(_ uiView: ARView, context: Context) {
if let modelEntity = model.modelEntity {
print("\(model.modelName)")
let anchorEntity = AnchorEntity(plane: .horizontal)
anchorEntity.addChild(modelEntity.clone(recursive: true))
uiView.scene.addAnchor(anchorEntity)
// modelEntity.generateCollisionShapes(recursive: true)
// If we have multiple object, recursive true help to generate collision for all of them
uiView.installGestures(.rotation, for: modelEntity as! Entity & HasCollision)
uiView.debugOptions = .showPhysics
} else {
print("Unable to load modelEntity for \(model.modelName)")
}
}
这里的问题是`“参数类型'Entity'与预期类型'HasCollision'不符”。所以我无法添加任何手势。
但是我找不到任何有用的资源来实现我的最终目标。有什么建议吗？
答案 0 :(得分：2)
使用as!和Entity & HasCollision强制转换（类型转换）arView.installGestures([.rotation], for: modelEntity as! Entity & HasCollision)
。
let entity = modelEntity as? Entity & HasCollision
arView.installGestures([.all], for: entity!)
或这种方式：
installGestures(_:for:)
source 实例方法@discardableResult func installGestures(_ gestures: ARView.EntityGestures = .all,
for entity: HasCollision) -> [EntityGestureRecognizer]
看起来像这样：
physics = participates
在编译之前，在Reality Composer中为模型设置motion type = fixed和accessibility = accessibility enabled和import SwiftUI
import RealityKit
struct ARViewContainer: UIViewRepresentable {
let boxAnchor = try! Experience.loadBox()
func makeUIView(context: Context) -> ARView {
let arView = ARView(frame: .zero)
arView.scene.anchors.append(boxAnchor)
return arView
}
func updateUIView(_ uiView: ARView, context: Context) {
if let modelEntity: Entity = boxAnchor.steelBox {
let anchorEntity = AnchorEntity(.plane(.vertical,
classification: .wall,
minimumBounds: [0.2, 0.2]))
anchorEntity.addChild(modelEntity.clone(recursive: true))
uiView.scene.addAnchor(anchorEntity)
modelEntity.generateCollisionShapes(recursive: true)
uiView.installGestures([.all],
for: modelEntity as! Entity & HasCollision)
uiView.debugOptions = [.showPhysics]
}
}
}
。
import pandas as pd
import numpy as np
# These are the first 30 rows of the csv file
'Budget Code,Level 02,Level 03,2015-07-31,2015-08-31,2015-09-30,2015-10-31,2015-11-30,2015-12-31,2016-01-31,2016-02-29,2016-03-31,2016-04-30,2016-05-31,2016-06-30,2016-07-31,2016-08-31,2016-09-30,2016-10-31,2016-11-30,2016-12-31,2017-01-31,2017-02-28,2017-03-31,2017-04-30,2017-05-31,2017-06-30,2017-07-31,2017-08-31,2017-09-30,2017-10-31,2017-11-30,2017-12-31,2018-01-31,2018-02-28,2018-03-31,2018-04-30,2018-05-31,2018-06-30,2018-07-31,2018-08-31,2018-09-30,2018-10-31,2018-11-30,2018-12-31,2019-01-31,2019-02-28,2019-03-31,2019-04-30,2019-05-31,2019-06-30,2019-07-31,2019-08-31,2019-09-30,2019-10-31,2019-11-30,2019-12-31,2020-01-31,2020-02-29,2020-03-31,2020-04-30,2020-05-31,2020-06-30,2020-07-31,2020-08-31,2020-09-30,2020-10-31,2020-11-30,2020-12-31,2021-01-31,2021-02-28,2021-03-31,2021-04-30,2021-05-31,2021-06-30'
data = pd.read_csv(r'example_data.csv', index_col=[0,1,2]
data = data.fillna(0)
data.groupby('Budget Code').plot()
答案 1 :(得分：1)
问题是您试图赋予ModelEntity一种它不具备的功能（它没有碰撞处理程序）。
您需要自己创建一个符合HasCollision的实体。
我会尝试这样的事情：
import RealityKit
class MyEntity: Entity, HasAnchoring, HasModel, HasCollision {
}
func updateUIView(_ uiView: ARView, context: Context) {
// This is simply to create a dummy modelEntity
let plane = MeshResource.generatePlane(width: 0.1, depth: 0.1)
let texture = MaterialColorParameter.color(UIColor.red)
var material = SimpleMaterial()
material.baseColor = texture
let modelEntity = ModelEntity(mesh: plane, materials: [material])
// This is the class we have wrapping the model
let myEntity = MyEntity()
myEntity.addChild(modelEntity)
// Now, we add the collision component
let boxShape = ShapeResource.generateBox(width: 0.1, height: 0.1, depth: 0.1)
let boxShapeCollisionComponent = CollisionComponent (
shapes: [boxShape],
mode: .trigger,
filter: .default
)
myEntity.collision = boxShapeCollisionComponent
// Or, you could of called myEntity.generateCollisionShapes(recursive: true)
// Last thing, lets put this plane, with a box collision component,
// right in front of us
myEntity.transform = Transform.identity
myEntity.transform.translation.z = myEntity.transform.translation.z - 0.3
uiView.scene.addAnchor(myEntity)
uiView.installGestures(.rotation, for: myEntity)
uiView.debugOptions = .showPhysics
}
答案 2 :(得分：0)
我还有其他情况：我需要从.usdz文件中加载模型，它应该具有动画。但是我还需要像平移和旋转这样的手势。研究将我引向正确答案的thread。我将在下面显示的代码的主要思想是“将具有动画的加载实体嵌套在ModelEntity内，然后根据加载的模型边界为该ModelEntity赋予适当的CollisionComponent”。 （c）
loadRequest = Entity.loadAsync(contentsOf: url).sink(receiveCompletion: { status in
print(status)
}) { entity in
// Scaling entity to a reasonable size
entity.setScale(SIMD3(repeating: 0.01), relativeTo: nil)
// Creating parent ModelEntity
let parentEntity = ModelEntity()
parentEntity.addChild(entity)
// Anchoring the entity and adding it to the scene
let anchor = AnchorEntity(.plane(.horizontal, classification: .any, minimumBounds: .zero))
anchor.addChild(parentEntity)
self.arView.scene.addAnchor(anchor)
// Playing availableAnimations on repeat
entity.availableAnimations.forEach { entity.playAnimation($0.repeat()) }
// Add a collision component to the parentEntity with a rough shape and appropriate offset for the model that it contains
let entityBounds = entity.visualBounds(relativeTo: parentEntity)
parentEntity.collision = CollisionComponent(shapes: [ShapeResource.generateBox(size: entityBounds.extents).offsetBy(translation: entityBounds.center)])
// installing gestures for the parentEntity
self.arView.installGestures(for: parentEntity)
}