Hello, I am doing to load model from bundle and it is loaded successfully. Now I am scaling model using GestureExtension from apple demo code. (https://developer.apple.com/documentation/realitykit/transforming-realitykit-entities-with-gestures?changes=_8)
@State private var selectedEntityName : String = ""
@State private var modelEntity: ModelEntity?
var body: some View {
contentView
.task {
do {
modelEntity = try await ModelEntity.loadArcadeMachine()
} catch {
fatalError(error.localizedDescription)
}
}
}
@ViewBuilder
private var contentView: some View {
if let modelEntity {
RealityView { content, attachments in
modelEntity.position = SIMD3<Float>(x: 0, y: -0.3, z: -5)
print(modelEntity.transform.scale)
modelEntity.transform.scale = [0.006, 0.006, 0.006]
content.add(modelEntity)
if let percentTextAttachment = attachments.entity(for: "percentage") {
percentTextAttachment.position = [0, 50, 0]
modelEntity.addChild(percentTextAttachment)
}
} update: { content, attachments in
// I want here to get updated scaling value and it is showing in RealityView attachmnt text.
} attachments: {
Attachment(id: "percentage") {
Text("\(modelEntity.name) \(modelEntity.scale * 100) %")
.font(.system(size: 5000))
.background(.red)
}
}
// This method am using for gesture support
.installGestures()
} else {
ProgressView()
}
}
}
Below code from GestureExtension
let state = EntityGestureState.shared
guard canScale, !state.isDragging else { return }
let entity = value.entity
if !state.isScaling {
state.isScaling = true
state.startScale = entity.scale
}
let magnification = Float(value.magnification)
entity.scale = state.startScale * magnification
state.magnifyValue = magnification
magnifyScale = Double(magnification)
print("Entity Name ::::::: \(entity.name)")
print("Scale ::::::: \(entity.scale)")
print("Magnification ::::::: \(magnification)")
print("StartScale ::::::: \(state.startScale)")
> This "magnification" value I need to use in RealityView class. How can i Do it? Could you please guide it.
}
Hello @Sandip_Aura,
I believe you are trying to utilize the current gesture state of the MagnifyGesture to update your UI. For this task, I recommend making use of @GestureState.
It is tricky to implement this in that sample project, but here is how you can do it:
- Add
@GestureState private var magnification: Double = 1as a property of ContentView. - Update the RealityView extension that defines magnifyGesture to build a gesture that updates the magnification GestureState:
/// Builds a magnify gesture.
func makeMagnifyGesture(magnification: GestureState<Double>) -> some Gesture {
MagnifyGesture()
.updating(magnification) { currentState, gestureState, transaction in
gestureState = currentState.magnification
}
.targetedToAnyEntity()
.useGestureComponent()
}
- Update the installGestures function to use the new magnify gesture, passing through the GestureState:
/// Apply this to a `RealityView` to pass gestures on to the component code.
func installGestures(magnification: GestureState<Double>) -> some View {
simultaneousGesture(dragGesture)
.simultaneousGesture(makeMagnifyGesture(magnification: magnification))
.simultaneousGesture(rotateGesture)
}
- Update the ContentView to pass through the GestureState to installGestures:
.installGestures(magnification: $magnification)
// This onChange will print the current magnification value ✅
.onChange(of: magnification) { oldValue, newValue in
print("Current magnification: \(newValue)")
}
