A simple class for drawing 3D paths using SceneKit
let scene: SCNScene = sceneCreatedEarlier
var points: [SCNVector3] = arrayOfPointsFromEarlier
let path = Path3()
var nodes: [SCNNode] = []
for point in points {
nodes.append(path.continuePath(from: point)!)
}
for node in nodes { scene.rootNode.addChildNode(node) }