如何提高ARKit测量两个SCNNode之间距离的准确性？

Question

Do someone know how to improve measurement in ARKit.

My current ARConfiguration is:

    let configuration = ARWorldTrackingConfiguration()
    configuration.maximumNumberOfTrackedImages = 10
    configuration.environmentTexturing = .automatic

    configuration.planeDetection = [.horizontal , .vertical]
    configuration.isLightEstimationEnabled = true
    configuration.worldAlignment = .gravity

I try to calculate the distance between two SCNNodes. Are there any methods to improve this? I try to calculate distances between 2m - 10m. Sometimes the deviation is too high for me (30 cm+).

Is it possible to use the planes to improve the accuracy? Or any other ideas?

Thanks for help.

Answer 1

SCNNodes have positions in Vectors see documentation

From the these two properties of your two scenenodes you can compute the distance between them with simple physics. For example your can compute the distance in 2D and the distance in 3d world. An example can be done with these 2 extensions.

extension SCNVector3 {
    static func distanceFrom(vector vector1: SCNVector3, toVector vector2: SCNVector3) -> Float {
        let x0 = vector1.x
        let x1 = vector2.x
        let y0 = vector1.y
        let y1 = vector2.y
        let z0 = vector1.z
        let z1 = vector2.z

        return sqrtf(powf(x1-x0, 2) + powf(y1-y0, 2) + powf(z1-z0, 2))
    }
}

And then in your main class you can call the static function like that

let scnNode1 = SCNNode() //Your test node
let scnNode2 = SCNNode() //Your test node
let distance = SCNVector3.distanceFrom(vector: scnNode1.position, toVector: scnNode2.position)