Adding CustomEntity to the Plane Anchor in RealityKit-CodePudding

I have implemented a simple custom entity as shown below:

class Box: Entity, HasModel, HasAnchoring {
        
    required init(color: UIColor) {            
        super.init()                    
        self.components[ModelComponent.self] = ModelComponent(mesh: MeshResource.generateBox(size: 0.3), 
                                                         materials: [SimpleMaterial(color: color, isMetallic: true)])
    }
    
    convenience init(color: UIColor, position: SIMD3<Float>) {
        self.init(color: color)
        self.position = position 
    }
    
    required init() {
        fatalError("init() has not been implemented")
    }
}

ContentView.swift

I try to add the Box entity to the anchor, defined by the horizontal plane.

func makeUIView(context: Context) -> ARView {
        
    let arView = ARView(frame: .zero)            
    let anchorEntity = AnchorEntity(plane: .horizontal)
        
    let box = Box(color: .red)
    anchorEntity.addChild(box)
    arView.scene.anchors.append(anchorEntity)
    return arView
}

But, the Box entity never appears to be resting on the horizontal plane. It always seems to be floating on the top. Why is that?

CodePudding user response：

To prevent world anchoring at [0, 0, 0], you don't need to conform to the HasAnchoring protocol:

class Box: Entity, HasModel {
    // content...
}

So, your AnchorEntity(plane: .horizontal) are now active.