MeshInstancesComponent VisionOS 26 Beta 2

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Created 5d

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Has anyone had success with MeshInstancesComponent? I tried to follow the sample code from What's New in RealityKit but it wouldn't compile. I was able to use one of the init overloads to get it to compile, but using it crashes both my device and the simulator. Even with one instance.

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Answer 1

Vision Pro Engineer OP

Apple

5d

Hi @jkdufair,

This code is working for me:

let scene = ModelEntity(mesh: MeshResource.generateSphere(radius: 0.2), materials: [SimpleMaterial(color: .orange, isMetallic: false)])
var meshInstancesComponent = MeshInstancesComponent()
let count = 20
do {
  let instances = try LowLevelInstanceData(instanceCount: 20)
  meshInstancesComponent[partIndex: 0] = .init(data: instances)
                
  instances.withMutableTransforms { transforms in
    for i in 0..<count {
      let scale: Float = .random(in:0.018...0.025)
      let angle: Float = .random(in:0..<2) * .pi
      let range = Float(-0.1)...Float(0.1)
      let positionX = Float.random(in: range)
      let positionY = Float.random(in: range)
      let positionZ = Float.random(in: range)
      let position = SIMD3<Float>(x: positionX, y: positionY, z: positionZ)
      let transform = Transform(scale: .init(repeating: scale),
                                                     rotation: .init(angle:                angle,axis: [0, 1, 0]),
                                                  translation: position)
      transforms[i] = transform.matrix
    }
  }
                
                scene.components.set(meshInstancesComponent)
            } catch {
                print("error = \(error)")
            }
            content.add(scene)

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