Lab 096 – Vector Example
Shows the vector of an object.
Background
Michael Temper is teaching visionOS at the University of Applied Sciences Upper Austria. A couple of weeks ago he wrote about this work on LinkedIn. Michael graciously provided some of the labs/examples that he has been building so we can share them with you here. This is the third lab of seven. The labs in this series focus on foundational 3D concepts.
Check out the post from Michael
Lab Code
This lab uses the Draw component and system to visualize the pivot point of an entity. It also includes an ornament that displays data and UI. You can move the entity directly and watch how the values on the display change in real time.
struct Lab096: View {
@State var root = Entity()
@State var sphere = Entity()
@State var subscriptions = [EventSubscription]()
@State var rootToSphereVectorVisual: Vector?
init() {
registerComponentsAndSystems()
}
func registerComponentsAndSystems() {
DrawComponent.registerComponent()
DrawRuntimeComponent.registerComponent()
DrawSystem.registerSystem()
}
var body: some View {
RealityView { content in
setupRoot()
setupSphere()
setupVisualizations()
root.addChild(sphere)
content.add(root)
subscriptions.append(content.subscribe(to: SceneEvents.Update.self, componentType: DrawComponent.self, { event in
handleUpdate(for: event)
}))
}
.ornament(attachmentAnchor: .scene(.topBack)) {
ornamentUI
}
.preferredWindowClippingMargins(.all, 1000)
}
var ornamentUI: some View {
VStack(alignment: .leading, spacing: 10) {
let rootToSphereVector = sphere.observable.position - root.observable.position
VectorDisplay(title: "Root To Sphere Vector", vector: rootToSphereVector)
}
.padding(.horizontal, 40)
.padding(.vertical)
.glassBackgroundEffect()
}
func setupRoot() {
root.components.set(DrawComponent(showAxes: true))
root.components.set(DrawRuntimeComponent())
}
func setupSphere() {
var material = UnlitMaterial(color: .white)
material.blending = .transparent(opacity: PhysicallyBasedMaterial.Opacity(floatLiteral: 0.5))
sphere = ModelEntity(
mesh: .generateSphere(radius: 0.015),
materials: [material])
sphere.name = "Sphere"
sphere.position = [0.1, 0.1, 0.1]
var manipulationComponent = ManipulationComponent()
manipulationComponent.releaseBehavior = .stay
manipulationComponent.dynamics.primaryRotationBehavior = .none
manipulationComponent.dynamics.secondaryRotationBehavior = .none
manipulationComponent.dynamics.scalingBehavior = .none
manipulationComponent.dynamics.inertia = .zero
sphere.components.set(manipulationComponent)
sphere.generateCollisionShapes(recursive: true)
sphere.components.set(InputTargetComponent())
sphere.components.set(HoverEffectComponent())
sphere.components.set(DrawComponent())
sphere.components.set(DrawRuntimeComponent())
}
func setupVisualizations() {
rootToSphereVectorVisual = sphere.addVector(
from: root.position,
to: sphere.position,
color: .cyan
)
}
func handleUpdate(for event: Event) {
sphere.updateVector(with: rootToSphereVectorVisual?.id) { vector in
vector.start = root.position
vector.end = sphere.position
}
}
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