现在,当卡被检测到时,我能够显示不同的SCNPlane
。在显示SCNPlanes
之后,用户触摸任何飞机以显示新的SCNPlane
。但现在触摸工作正常,但新的SCNPlane
没有显示。
这是我尝试过的代码:
var cake_1_PlaneNode : SCNNode? = nil
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
guard let imageAnchor = anchor as? ARImageAnchor else { return }
if let imageName = imageAnchor.referenceImage.name {
print(imageName)
if imageName == "menu" {
// Check To See The Detected Size Of Our menu Card (Should By 5cm*3cm)
let menuCardWidth = imageAnchor.referenceImage.physicalSize.width
let menuCardHeight = imageAnchor.referenceImage.physicalSize.height
print(
"""
We Have Detected menu Card With Name \(imageName)
\(imageName)'s Width Is \(menuCardWidth)
\(imageName)'s Height Is \(menuCardHeight)
""")
//raspberry
//cake 1
let cake_1_Plane = SCNPlane(width: 0.045, height: 0.045)
cake_1_Plane.firstMaterial?.diffuse.contents = UIImage(named: "france")
cake_1_Plane.cornerRadius = 0.01
let cake_1_PlaneNode = SCNNode(geometry: cake_1_Plane)
self.cake_1_PlaneNode = cake_1_PlaneNode
cake_1_PlaneNode.eulerAngles.x = -.pi/2
cake_1_PlaneNode.runAction(SCNAction.moveBy(x: 0.15, y: 0, z: -0.125, duration: 0.75))
node.addChildNode(cake_1_PlaneNode)
self.sceneView.scene.rootNode.addChildNode(node)
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first as! UITouch
if(touch.view == self.sceneView){
//print("touch working")
let viewTouchLocation:CGPoint = touch.location(in: sceneView)
guard let result = sceneView.hitTest(viewTouchLocation, options: nil).first else {
return
}
if let planeNode = cake_1_PlaneNode, cake_1_PlaneNode == result.node{
print("match")
cake_1()
}
}
}
func cake_1() {
let plane = SCNPlane(width: 0.15 , height: 0.15)
plane.firstMaterial?.diffuse.contents = UIColor.black.withAlphaComponent(0.75)
let planeNodee = SCNNode(geometry: plane)
planeNodee.eulerAngles.x = -.pi / 2
planeNodee.runAction(SCNAction.moveBy(x: 0.21, y: 0, z: 0, duration: 0))
} //cake_1
查看代码,我可以看到几个问题(更不用说变量和方法的命名约定)。
首先,您正在创建一个Global Variable
,您已声明如下:
var cake_1_PlaneNode : SCNNode? = nil
但是你在yourLocal
中使用Global Variable
和cake_1_PlaneNode
作为你的Delegate Callback
:
let cake_1_PlaneNode = SCNNode(geometry: cake_1_Plane)
self.cake_1_PlaneNode = cake_1_PlaneNode
这应该只是这样读:
self.cake_1_PlaneNode = SCNNode(geometry: cake_1_Plane)
其次,你将你的cake_1_PlaneNode
添加到你的rootNode
的ARSCNView
而不是你检测到的ARImageAnchor
,这可能是你不想做的事情,因为当检测到ARAnchor
时:
您可以通过将几何体(或其他SceneKit功能)附加到此节点或添加子节点来为锚点提供可视内容。
因此,这种方法(除非你真的想这样做)是不必要的。
剩下的问题在于你的cake_1
函数本身。
首先,你实际上并没有将planeNodee
添加到你的sceneHierachy
。
由于您尚未指定是否应将新初始化的planeNode
直接添加到您的ARSCNView
或childNode
的cake_1_planeNode
,您的function
应包括以下其中一项:
self.sceneView.scene.rootNode.addChildNode(planeNodee)
self.cake_1_planeNode.addChildNode(planeNodee)
此外,可能也没有必要旋转你的planeNodee
,因为默认情况下SCNPlane
是垂直渲染的。
由于您没有规定放置内容的位置,因此使用-.pi / 2
可能是不必要的,因为这可能使其几乎看不见肉眼。
另一个问题也可能导致您在实际添加节点时没有看到您的节点是Z位置。
如果您在同一位置设置2个节点,您可能会遇到一个问题,如Z-fighting
(您可以阅读更多有关here的信息)。因此,您可能应该在添加节点时稍微向前移动添加的节点,例如SCNVector3 (0,0,0.001)
to说明了这一点。
基于所有这些要点,我在下面提供了一个完整的工作和评论示例:
import UIKit
import ARKit
//-------------------------
//MARK: - ARSCNViewDelegate
//-------------------------
extension ViewController: ARSCNViewDelegate {
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
//1. Check We Have An ARImageAnchor, Then Get It's Reference Image & Name
guard let imageAnchor = anchor as? ARImageAnchor else { return }
let detectedTarget = imageAnchor.referenceImage
guard let detectedTargetName = detectedTarget.name else { return }
//2. If We Have Detected Our Virtual Menu Then Add The CakeOnePlane
if detectedTargetName == "cakeMenu" {
let cakeOnePlaneGeometry = SCNPlane(width: 0.045, height: 0.045)
cakeOnePlaneGeometry.firstMaterial?.diffuse.contents = UIColor.cyan
cakeOnePlaneGeometry.cornerRadius = 0.01
let cakeOnPlaneNode = SCNNode(geometry: cakeOnePlaneGeometry)
cakeOnPlaneNode.eulerAngles.x = -.pi/2
//3. To Allow Us To Easily Keep Track Our Our Currently Added Node We Will Assign It A Unique Name
cakeOnPlaneNode.name = "Strawberry Cake"
node.addChildNode(cakeOnPlaneNode)
cakeOnPlaneNode.runAction(SCNAction.moveBy(x: 0.15, y: 0, z: 0, duration: 0.75))
}
}
}
class ViewController: UIViewController {
@IBOutlet var augmentedRealityView: ARSCNView!
let augmentedRealitySession = ARSession()
let configuration = ARWorldTrackingConfiguration()
//------------------
//MARK: - Life Cycle
//------------------
override func viewDidLoad() {
super.viewDidLoad()
setupARSession()
}
//-----------------
//MARK: - ARSession
//-----------------
/// Runs The ARSession
func setupARSession(){
//1. Load Our Detection Images
guard let detectionImages = ARReferenceImage.referenceImages(inGroupNamed: "AR Resources", bundle: nil) else { return }
//2. Configure & Run Our ARSession
augmentedRealityView.session = augmentedRealitySession
augmentedRealityView.delegate = self
configuration.detectionImages = detectionImages
augmentedRealitySession.run(configuration, options: [.resetTracking, .removeExistingAnchors])
}
//--------------------
//MARK: - Interaction
//--------------------
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
//1. Get The Current Touch Location & Perform An ARSCNHitTest To Check For Any Hit SCNNode's
guard let currentTouchLocation = touches.first?.location(in: self.augmentedRealityView),
let hitTestNode = self.augmentedRealityView.hitTest(currentTouchLocation, options: nil).first?.node else { return }
//2. If We Have Hit Our Strawberry Cake Then We Call Our makeCakeOnNode Function
if let cakeID = hitTestNode.name, cakeID == "Strawberry Cake"{
makeCakeOnNode(hitTestNode)
}
}
/// Adds An SCNPlane To A Detected Cake Target
///
/// - Parameter node: SCNNode
func makeCakeOnNode(_ node: SCNNode){
let planeGeometry = SCNPlane(width: 0.15 , height: 0.15)
planeGeometry.firstMaterial?.diffuse.contents = UIColor.black.withAlphaComponent(0.75)
let planeNode = SCNNode(geometry: planeGeometry)
planeNode.position = SCNVector3(0, 0, 0.001)
planeNode.runAction(SCNAction.moveBy(x: 0.21, y: 0, z: 0, duration: 0))
node.addChildNode(planeNode)
}
}
这在我的设备上产生以下内容:
对于您的信息,这似乎表明您放置内容的计算是关闭的(除非当然这是期望的结果)。
正如您所看到的,所有内容都正确呈现,但是这些内容的间距非常大,因此您可能需要稍微平移设备,以便在进一步测试和开发时看到它们。
希望能帮助到你...
***请为变量和函数使用描述性和清晰的名称,这很难阅读和理解您的代码。你可以在这里阅读更多关于swift造型指南的信息:https://github.com/raywenderlich/swift-style-guide#naming
当用户触摸屏幕时,您正在创建新平面,但是您没有将该平面添加到场景中,因此“cake_1()”函数仅创建新平面。当ARKit检测到图像时,它会自动创建一个空节点并将其添加到我们的场景中,位于检测到的图像的中心。我们必须首先保留对ARKit在检测到图像时为我们添加的节点的引用。将此变量添加到类的顶部:
var detectedImageNode: SCNNode?
然后在func渲染器(渲染器:didAdd node:,for anchor :)中添加以下行:
detectedImageNode = node
现在我们有了对节点的引用,我们可以轻松添加和删除其他节点。在cake_1()的末尾添加以下行:
if let detectedImageNode = detectedImageNode {
cake_1_PlaneNode?.removeFromParentNode()
detectedImageNode.addChildNode(planeNodee)
}
您的最终代码应如下所示:
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
guard let imageAnchor = anchor as? ARImageAnchor else { return }
if let imageName = imageAnchor.referenceImage.name {
print(imageName)
if imageName == "menu" {
let cake_1_Plane = SCNPlane(width: 0.045, height: 0.045)
cake_1_Plane.firstMaterial?.diffuse.contents = UIImage(named: "france")
cake_1_Plane.cornerRadius = 0.01
let cake_1_PlaneNode = SCNNode(geometry: cake_1_Plane)
self.cake_1_PlaneNode = cake_1_PlaneNode
cake_1_PlaneNode.eulerAngles.x = -.pi/2
cake_1_PlaneNode.runAction(SCNAction.moveBy(x: 0.15, y: 0, z: -0.125, duration: 0.75))
node.addChildNode(cake_1_PlaneNode)
// No need to add the following line. The node is already added to the scene
//self.sceneView.scene.rootNode.addChildNode(node)
detectedImageNode = node
}
}
}
func cake_1() {
let plane = SCNPlane(width: 0.15 , height: 0.15)
plane.firstMaterial?.diffuse.contents = UIColor.black.withAlphaComponent(0.75)
let planeNodee = SCNNode(geometry: plane)
planeNodee.eulerAngles.x = -.pi / 2
if let detectedImageNode = detectedImageNode {
cake_1_PlaneNode?.removeFromParentNode()
detectedImageNode.addChildNode(planeNodee)
}
}
替代方案
如果您只是想改变飞机的图像,那么更简单的方法就是改变飞机的纹理。将cake_1()的内容替换为:
if let planeGeometry = cake_1_PlaneNode?.geometry {
planeGeometry.firstMaterial?.diffuse.contents = UIImage(named: "newImage")
}