在 ARImageTrackingConfiguration 中转换坐标
Convert coordinates in ARImageTrackingConfiguration
使用 ARKit 2 添加了一个新配置:ARImageTrackingConfiguration
根据 SDK 可以有更好的性能和一些新的用例。
在 Xcode 10b2 上进行试验(请参阅 https://forums.developer.apple.com/thread/103894 如何修复资产加载)我的代码现在正确地调用了跟踪图像的委托,此后添加了一个节点,但我可以找不到坐标系所在的任何文档,因此有人知道如何将节点放入场景中以覆盖检测到的图像:
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
DispatchQueue.main.async {
if let imageAnchor = anchor as? ARImageAnchor {
let imageNode = SCNNode.createImage(size: imageAnchor.referenceImage.physicalSize)
imageNode.transform = // ... ???
node.addChildNode(imageNode)
}
}
}
ps:与ARWorldTrackingConfiguration
相反,原点似乎不断移动(很可能将相机置于 0,0,0)。
pps: SCNNode.createImage
是辅助函数,没有任何坐标计算。
假设我已经正确阅读了您的问题,您可以执行以下操作:
func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
let nodeToReturn = SCNNode()
//1. Check We Have Detected Our Image
if let validImageAnchor = anchor as? ARImageAnchor {
//2. Log The Information About The Anchor & Our Reference Image
print("""
ARImageAnchor Transform = \(validImageAnchor.transform)
Name Of Detected Image = \(validImageAnchor.referenceImage.name)
Width Of Detected Image = \(validImageAnchor.referenceImage.physicalSize.width)
Height Of Detected Image = \(validImageAnchor.referenceImage.physicalSize.height)
""")
//3. Create An SCNPlane To Cover The Detected Image
let planeNode = SCNNode()
let planeGeometry = SCNPlane(width: validImageAnchor.referenceImage.physicalSize.width,
height: validImageAnchor.referenceImage.physicalSize.height)
planeGeometry.firstMaterial?.diffuse.contents = UIColor.white
planeNode.geometry = planeGeometry
//a. Set The Opacity To Less Than 1 So We Can See The RealWorld Image
planeNode.opacity = 0.5
//b. Rotate The PlaneNode So It Matches The Rotation Of The Anchor
planeNode.eulerAngles.x = -.pi / 2
//4. Add It To The Node
nodeToReturn.addChildNode(planeNode)
//5. Add Something Such As An SCNScene To The Plane
if let modelScene = SCNScene(named: "art.scnassets/model.scn"), let modelNode = modelScene.rootNode.childNodes.first{
//a. Set The Model At The Center Of The Plane & Move It Forward A Tad
modelNode.position = SCNVector3Zero
modeNode.position.z = 0.15
//b. Add It To The PlaneNode
planeNode.addChildNode(modelNode)
}
}
return nodeToReturn
}
希望这会为您指明正确的方向...
使用 ARKit 2 添加了一个新配置:ARImageTrackingConfiguration
根据 SDK 可以有更好的性能和一些新的用例。
在 Xcode 10b2 上进行试验(请参阅 https://forums.developer.apple.com/thread/103894 如何修复资产加载)我的代码现在正确地调用了跟踪图像的委托,此后添加了一个节点,但我可以找不到坐标系所在的任何文档,因此有人知道如何将节点放入场景中以覆盖检测到的图像:
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
DispatchQueue.main.async {
if let imageAnchor = anchor as? ARImageAnchor {
let imageNode = SCNNode.createImage(size: imageAnchor.referenceImage.physicalSize)
imageNode.transform = // ... ???
node.addChildNode(imageNode)
}
}
}
ps:与ARWorldTrackingConfiguration
相反,原点似乎不断移动(很可能将相机置于 0,0,0)。
pps: SCNNode.createImage
是辅助函数,没有任何坐标计算。
假设我已经正确阅读了您的问题,您可以执行以下操作:
func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {
let nodeToReturn = SCNNode()
//1. Check We Have Detected Our Image
if let validImageAnchor = anchor as? ARImageAnchor {
//2. Log The Information About The Anchor & Our Reference Image
print("""
ARImageAnchor Transform = \(validImageAnchor.transform)
Name Of Detected Image = \(validImageAnchor.referenceImage.name)
Width Of Detected Image = \(validImageAnchor.referenceImage.physicalSize.width)
Height Of Detected Image = \(validImageAnchor.referenceImage.physicalSize.height)
""")
//3. Create An SCNPlane To Cover The Detected Image
let planeNode = SCNNode()
let planeGeometry = SCNPlane(width: validImageAnchor.referenceImage.physicalSize.width,
height: validImageAnchor.referenceImage.physicalSize.height)
planeGeometry.firstMaterial?.diffuse.contents = UIColor.white
planeNode.geometry = planeGeometry
//a. Set The Opacity To Less Than 1 So We Can See The RealWorld Image
planeNode.opacity = 0.5
//b. Rotate The PlaneNode So It Matches The Rotation Of The Anchor
planeNode.eulerAngles.x = -.pi / 2
//4. Add It To The Node
nodeToReturn.addChildNode(planeNode)
//5. Add Something Such As An SCNScene To The Plane
if let modelScene = SCNScene(named: "art.scnassets/model.scn"), let modelNode = modelScene.rootNode.childNodes.first{
//a. Set The Model At The Center Of The Plane & Move It Forward A Tad
modelNode.position = SCNVector3Zero
modeNode.position.z = 0.15
//b. Add It To The PlaneNode
planeNode.addChildNode(modelNode)
}
}
return nodeToReturn
}
希望这会为您指明正确的方向...