swift - 图像的立方体结构和旋转

Question

使用 iOS 很长时间后，我从未有过 3D 经验，现在我需要创建 1 个可以旋转的立方体。

我正在尝试弄清楚如何从图像创建立方体，并快速旋转它。

此链接https://www.raywenderlich.com/12667/how-to-rotate-a-3d-object-using-touches-with-opengl确实做到了这一点，但速度并不快。

他的其他 swift 教程要复杂得多。

我希望有两个功能:

1. 从图像创建 3D 立方体
2. 将其旋转到某个 x,y,z

是否有一个简单的 Apple 3D 动画类？

Answer 1

import UIKit
import SceneKit   
import QuartzCore

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    let scene = SCNScene()
    let scnView = self.view as! SCNView
    scnView.scene = scene

    let cameraNode = SCNNode()
    cameraNode.camera = SCNCamera()
    scene.rootNode.addChildNode(cameraNode)
    cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)   //where will be situated a cube

    scnView.allowsCameraControl = true       //that's for you can spin it any direction with your finger if you are bored
    scnView.autoenablesDefaultLighting = true   //Lightting 

    var geometries = [
        SCNBox(width: 4.0, height: 4.0, length: 4.0, chamferRadius: 0),
    ] //This is the cube with parameters of 4

    var materials = [SCNMaterial]()
    for i in 1...6 {
        let material = SCNMaterial()
        if i == 1 { material.diffuse.contents = UIImage (named: "qr.png") }
        if i == 2 { material.diffuse.contents = UIColor(red: 0.6784, green: 0.698, blue: 0.7412, alpha: 1.0) }
        if i == 3 { material.diffuse.contents = UIColor(red: 0.6784, green: 0.698, blue: 0.7412, alpha: 1.0) }
        if i == 4 { material.diffuse.contents = UIColor(red: 0.6784, green: 0.698, blue: 0.7412, alpha: 1.0) }
        if i == 5 { material.diffuse.contents = UIColor(red: 0.6784, green: 0.698, blue: 0.7412, alpha: 1.0) }
        if i == 6 { material.diffuse.contents = UIColor(red: 0.7882, green: 0.7961, blue: 0.8863, alpha: 1.0) }
        materials.append(material)
    } //this is to coloring each side of cube

    for i in 0..<geometries.count {
        let geometry = geometries[i]
        let node = SCNNode(geometry: geometry)

        node.geometry?.materials = materials
        node.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 1, y: 1, z: 1, duration: 5)))
        scene.rootNode.addChildNode(node)
    }
 }