我可以从 Swift 上的 Web 服务器获取 3d 模型吗? [英] Can I get 3d models from web servers on Swift?

问题描述

我正在使用 Arkit 开发一个应用程序.有很多 3D 模型，而且我的应用程序中的尺寸很大.我可以从另一台服务器(外部站点)获取这些模型吗?我是 swift 的新手，我似乎找不到关于从网络服务器加载 3d 模型的任何内容.

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.

在那里改变模型路径就足够了吗?谢谢

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)
}

所有代码:

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()
    ]
}

推荐答案

您可以从具有这样 ip 地址的网络服务器加载 scn 文件(我在下面使用了假 ip)

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)

这是一个简单的 Swift PlayGrounds，它从我的 github 存储库中提取了一个测试立方体 scn 文件.您只需点击任意位置即可加载立方体.

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 

这篇关于我可以从 Swift 上的 Web 服务器获取 3d 模型吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！