Can I get 3d models from web servers on Swift? - swift

Question

I'm working on an application with Arkit. There are many 3D models and the size is big in my app. Can I get these models out of another server (outside sites)? I'm new on swift, I can't seem to find anything on loading a 3d model from a web server.
is it enough to change the model path there? Thank you
func loadModel() {
guard let virtualObjectScene = SCNScene(named: "\(modelName).\(fileExtension)", inDirectory: "Models.scnassets/\(modelName)") else {
return
}
let wrapperNode = SCNNode()
for child in virtualObjectScene.rootNode.childNodes {
let defaults = UserDefaults.standard
wrapperNode.addChildNode(child)
}
self.addChildNode(wrapperNode)
}
All code:
import UIKit
import SceneKit
import ARKit
class VirtualObject: SCNNode {
var modelName: String = ""
var fileExtension: String = ""
var thumbImage: UIImage!
var title: String = ""
var viewController: ViewController?
override init() {
super.init()
self.name = "Virtual object root node"
}
init(modelName: String, fileExtension: String, thumbImageFilename: String, title: String) {
super.init()
self.name = "Virtual object root node"
self.modelName = modelName
self.fileExtension = fileExtension
self.thumbImage = UIImage(named: thumbImageFilename)
self.title = title
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func loadModel() {
guard let virtualObjectScene = SCNScene(named: "\(modelName).\(fileExtension)", inDirectory: "Models.scnassets/\(modelName)") else {
return
}
let wrapperNode = SCNNode()
for child in virtualObjectScene.rootNode.childNodes {
let defaults = UserDefaults.standard
wrapperNode.addChildNode(child)
}
self.addChildNode(wrapperNode)
}
func unloadModel() {
self.removeFromParentNode()
for child in self.childNodes {
child.removeFromParentNode()
}
}
func translateBasedOnScreenPos(_ pos: CGPoint, instantly: Bool, infinitePlane: Bool) {
guard let controller = viewController else {
return
}
let result = controller.worldPositionFromScreenPosition(pos, objectPos: self.position, infinitePlane: infinitePlane)
controller.moveVirtualObjectToPosition(result.position, instantly, !result.hitAPlane)
}
}
extension VirtualObject {
static func isNodePartOfVirtualObject(_ node: SCNNode) -> Bool {
if node.name == "Virtual object root node" {
return true
}
if node.parent != nil {
return isNodePartOfVirtualObject(node.parent!)
}
return false
}
static let availableObjects: [VirtualObject] = [
Anatomy()
]
}

Answer 1

you can load an scn file from a webserver with ip addresses like this (i used a fake ip below)
let myURL = NSURL(string: “http://110.151.153.202:80/scnfiles/myfile.scn”)
let scene = try! SCNScene(url: myURL! as URL, options:nil)
Edit:
Here’s a simple Swift PlayGrounds which pulls a test cube scn file from my github repo. You just tap anywhere and the cube loads.
import ARKit
import SceneKit
import PlaygroundSupport
class ViewController: NSObject {
var sceneView: ARSCNView
init(sceneView: ARSCNView) {
self.sceneView = sceneView
super.init()
self.setupWorldTracking()
self.sceneView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(ViewController.handleTap(_:))))
}
private func setupWorldTracking() {
if ARWorldTrackingConfiguration.isSupported {
let configuration = ARWorldTrackingConfiguration()
configuration.planeDetection = .horizontal
configuration.isLightEstimationEnabled = true
self.sceneView.session.run(configuration, options: [])
}
}
#objc func handleTap(_ gesture: UITapGestureRecognizer) {
let results = self.sceneView.hitTest(gesture.location(in: gesture.view), types: ARHitTestResult.ResultType.featurePoint)
guard let result: ARHitTestResult = results.first else {
return
}
// pulls cube.scn from github repo
let myURL = NSURL(string: "https://raw.githubusercontent.com/wave-electron/scnFile/master/cube.scn")
let scene = try! SCNScene(url: myURL! as URL, options: nil)
let node = scene.rootNode.childNode(withName: "SketchUp", recursively: true)
node?.scale = SCNVector3(0.01,0.01,0.01)
let position = SCNVector3Make(result.worldTransform.columns.3.x, result.worldTransform.columns.3.y, result.worldTransform.columns.3.z)
node?.position = position
self.sceneView.scene.rootNode.addChildNode(node!)
}
}
let sceneView = ARSCNView()
let viewController = ViewController(sceneView: sceneView)
sceneView.autoenablesDefaultLighting = true
PlaygroundPage.current.needsIndefiniteExecution = true
PlaygroundPage.current.liveView = viewController.sceneView