Mesure distance using apple ARKit
GPL-2.0 License
Mesure distance using apple ARKit
cd到工程目录下,运行pod install
因为ARKit使用限制,设备要求为6s以上,系统最低要求为iOS11,Xcode版本为9以上
测量时需保证光线充足
ARKit目前只能识别水平的平面,所以只能测量水平面的长度,不能测量垂直平面上的长度,不知道视频里的是怎么实现的,有知道的小伙伴可以一起交流一下
去除了识别平面后才进行测量的逻辑,采用最近的特征点,可以测量垂直的物体啦
项目中确定起始和结束点的位置主要有以下几种
let planeHitTestResults = sceneView.hitTest(position, types: .existingPlaneUsingExtent)
if let result = planeHitTestResults.first {
let planeHitTestPosition = SCNVector3.positionFromTransform(result.worldTransform)
let planeAnchor = result.anchor
// Return immediately - this is the best possible outcome.
return (planeHitTestPosition, planeAnchor as? ARPlaneAnchor, true)
}
let highQualityfeatureHitTestResults = sceneView.hitTestWithFeatures(position, coneOpeningAngleInDegrees: 5, minDistance: 0.1, maxDistance: 3.0)
func fliterWithFeatures(_ features:[FeatureHitTestResult]) -> [SCNVector3] {
guard features.count >= 3 else {
return features.map { (featureHitTestResult) -> SCNVector3 in
return featureHitTestResult.position
};
}
var points = features.map { (featureHitTestResult) -> SCNVector3 in
return featureHitTestResult.position
}
// 平均值
let average = points.average!
// 方差
let variance = sqrtf(points.reduce(0) { (sum, point) -> Float in
var sum = sum
sum += (point-average).length()*100*(point-average).length()*100
return sum
}/Float(points.count-1))
// 标准差
let standard = sqrtf(variance)
let σ = variance/standard
points = points.filter { (point) -> Bool in
if (point-average).length()*100 > 3*σ {
print(point,average)
}
return (point-average).length()*100 < 3*σ
}
return points
}
let detectPlane = planeDetectWithFeatureCloud(featureCloud: warpFeatures)
var planePoint = SCNVector3Zero
if detectPlane.x != 0 {
planePoint = SCNVector3(detectPlane.w/detectPlane.x,0,0)
}else if detectPlane.y != 0 {
planePoint = SCNVector3(0,detectPlane.w/detectPlane.y,0)
}else {
planePoint = SCNVector3(0,0,detectPlane.w/detectPlane.z)
}
let ray = sceneView.hitTestRayFromScreenPos(position)
let crossPoint = planeLineIntersectPoint(planeVector: SCNVector3(detectPlane.x,detectPlane.y,detectPlane.z), planePoint: planePoint, lineVector: ray!.direction, linePoint: ray!.origin)
看到微博上AR虚拟尺子视频,就想试着模仿着实现一下
部分代码来自苹果ARKitDemo
平面拟合代码参考这篇博客
有任何建议或问题请提issue
ARuler开源在 GPL 协议下,详细请查看 LICENSE 文件