我目前正在尝试构建AR Chess应用程序，但无法正常工作。
我希望能够点击一个棋子，然后突出显示它在棋盘上可以进行的合法动作，并将其移动到用户点击的任何正方形。
棋盘设计和节点的图片： https://gyazo.com/2a88f9cda3f127301ed9b4a44f8be047
我要实现的目标： https://imgur.com/a/IGhUDBW
非常感谢您提供有关如何使其正常工作的建议。
谢谢！
ViewController代码：
import UIKit
import SceneKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
override func viewDidLoad() {
super.viewDidLoad()
// Set the view's delegate
sceneView.delegate = self
// Show statistics such as fps and timing information
sceneView.showsStatistics = true
// Add lighting to the scene
sceneView.autoenablesDefaultLighting = true
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration to track an external image
let configuration = ARImageTrackingConfiguration()
// Image detection
// Reference which group to find the image to detect in the Assets folder e.g. "Detection Card"
if let imageDetect = ARReferenceImage.referenceImages(inGroupNamed: "Detection Card", bundle: Bundle.main) {
// Sets image tracking properties to the image in the referenced group
configuration.trackingImages = imageDetect
// Amount of images to be tracked
configuration.maximumNumberOfTrackedImages = 1
}
// Run the view's session
sceneView.session.run(configuration)
}
// Run when horizontal surface is detected and display 3D object onto image
// ARAnchor - tells a certain point in world space is relevant to your app, makes virtual content appear "attached" to some real-world point of interest
func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode {
// Creates 3D object
let obj = SCNNode()
// Check if image detected through camera is an ARImageAnchor - which contains position and orientation data about the image detected in the session
if let imageAnchor = anchor as? ARImageAnchor {
// Set dimensions of the horizontal plane to be displayed onto the image to be the same as the image uploaded
let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
// Display mild transparent layer onto detected image
// This is to ensure image detection works by display a faint layer on the image
plane.firstMaterial?.diffuse.contents = UIColor(white: 1.0, alpha: 0.2)
// Set geometry shape of the plane
let planeNode = SCNNode(geometry: plane)
// Flip vertical plane to horizontal plane
planeNode.eulerAngles.x = -Float.pi / 2
obj.addChildNode(planeNode)
// Initialise chess scene
if let chessBoardSCN = SCNScene(named: "art.scnassets/chess.scn") {
// If there is a first in the scene file
if let chessNodes = chessBoardSCN.rootNode.childNodes.first {
// Displays chessboard upright
chessNodes.eulerAngles.x = Float.pi / 2
// Adds chessboard to the overall 3D scene
obj.addChildNode(chessNodes)
}
}
}
return obj
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
}
答案 0 :(得分：0)
您将需要在视图上添加手势，并使用ARSceneViews hitTest方法检测手势在您的场景中所触摸的内容。然后，您可以根据手势的移动来更新位置。
这是一个与拖动节点大致相同的问题。
答案 1 :(得分：0)
首先，您需要添加一个手势识别器以点按到viewDidLoad中，如下所示：
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
myScnView.addGestureRecognizer(tapGesture)
然后实现处理程序功能：
@objc
func handleTap(_ gestureRecognize: UIGestureRecognizer) {
// HERE YOU NEED TO DETECT THE TAP
// check what nodes are tapped
let location = gestureRecognize.location(in: myScnView)
let hitResults = myScnView.hitTest(location, options: [:])
// check that we clicked on at least one object
if hitResults.count > 0 {
// retrieved the first clicked object
let tappedPiece = hitResults[0].node
// HERE YOU CAN SHOW POSSIBLE MOVES
//Ex. showPossibleMoves(for: tappedPiece)
}
}
现在，要显示可能的移动，您需要 在棋盘上标识所有象限和节点位置 。
为此，您可以分配名称或数字，或者字母和数字的组合，或者数字的组合。 （我建议使用数字组合，例如第1行第1列，例如矩阵）。
让我接受我的建议，所以您可以命名每个象限1.1 1.2 ... 2.1 2.2等等。
现在，要检测您的作品在哪里，您可以检查与PhysicsContactDelegate的联系。
现在您有了tappedPiece以及它所在的位置，因此您必须为这些作品定义规则，例如：
let rules = ["tower":"cross"] //add the others
NB 。您可以选择要定义的规则。
让我接受我的建议，现在您应该创建突出显示功能：
func highlight(quadrant: SCNNode){
quadrant.geometry?.firstMaterial?.emission.contents = UIColor.yellow
}
最后 showPossibleMoves（用于：tappedPiece）可能是这样的：
func showPossibleMoves(for piece: SCNNode){
let pieceType = piece.name //You have to give the name as you did into your rules variable
//ex. if you have rules like ["tower":"cross"] you have to set all towers name to "tower"
let rule = rules[pieceType]
switch rule{
case "cross":
//you have to highlight all nodes on the right, left, above and bottom
// you can achieve this by selecting the start point and increase it
//assuming you named your quadrants like 1.1 1.2 or 11 12 13 ecc...
let startRow = Int(startQuadrant.name.first)
let startColumn = Int(startQuadrant.name.last)
//Now loop the highlight on right
for column in startColumn+1...MAX_COLUMN-1{
let quadrant = myScnView.scene.rootNode.childNode(withName:"\(startRow).\(column)" , recursively: true)
// call highlight function
highlight(quadrant: quadrant)
}
//Now loop for above quadrants
for row in startRow+1...MAX_ROW-1{
let quadrant = myScnView.scene.rootNode.childNode(withName:"\(row).\(startColumn)" , recursively: true)
// call highlight function
highlight(quadrant: quadrant)
}
//DO THE SAME FOR ALL DIRECTIONS
}
// ADD ALL CASES, like bishop movements "diagonals" and so on
}
注意： ：在handlerTap函数中，您必须检查所点击的内容，例如，在选择一个片段后检查是否在一个象限上进行点击（您要移动），可以检查布尔值和所选节点的名称
//assuming you have set the boolean value after selecting a piece
if pieceSelected && node.name != "tower"{
//HERE YOU CAN MOVE YOUR PIECE
}