My app allows a user to place an object by tapping on the screen. It also allows the user the delete It.
However, I want to limit to just a single object at any one time. But I cannot seem to do that. It always allow for more than 1 objects to be placed and creates confusion to the user.
I've tried adding the object to addChildNode[0] but it doesn't seem to work.
I also tried setting var domeArray = [SCNNode?](repeating: nil, count: 1) to a fixed single size array but it didn't work also.
Does the community has any experience on this?
Below is my code snippet.
var domeArray = [SCNNode]()
@IBOutlet var sceneView: ARSCNView!
@IBAction func removeCompass(_ sender: UIButton) {
if !domeArray.isEmpty {
for dome in domeArray {
dome.removeFromParentNode()
}
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let touchLocation = touch.location(in: sceneView)
guard let query = sceneView.raycastQuery(from: touchLocation, allowing: .existingPlaneInfinite, alignment: .any) else {
return
}
let results = sceneView.session.raycast(query)
if let hitResult = results.first {
let domescene = SCNScene(named: "art.scnassets/DOME.scn")!
if let domenode = domescene.rootNode.childNode(withName: "Sphere", recursively: true) {
domenode.position = SCNVector3(
x: hitResult.worldTransform.columns.3.x,
y: hitResult.worldTransform.columns.3.y,
z: hitResult.worldTransform.columns.3.z
)
domenode.rotation = SCNVector4(x: 0, y: 1, z: 0, w: -Float.pi/2)
domeArray.append(domenode)
sceneView.scene.rootNode.addChildNode(domenode)
}
}
}
}
Hello tzevoon,
I want to limit to just a single object at any one time. But I cannot seem to do that. It always allow for more than 1 objects to be placed and creates confusion to the user.
This is certainly achievable, the issue in your current code is that you are creating and adding a new child node every time you get a hit result.
My recommendation is that, once you have added this node to the scene once, just change the node's position when you get a new hit result.
