swift - 如何在Swift中使用核心图形绘制3D对象？

Question

如何在 Swift 中绘制带有核心图形的 3D 对象(最好是矩形)？

是否可能或者我必须使用不同的库？

用 UIKit 可以吗？

Answer 1

借用这个答案:https://stackoverflow.com/a/24127282/887210

您问题的关键部分是:

SCNBox(width: 1, height: 4, length: 9, chamferRadius: 0)

这使用 SceneKit 和 UIKit 绘制了一个矩形框。它被设置为在项目中的自定义 UIViewController 中使用，但它可以轻松适应其他用途。

示例代码:

override func loadView() {
  // create a scene view with an empty scene
  let sceneView = SCNView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
  let scene = SCNScene()
  sceneView.scene = scene

  // default lighting
  sceneView.autoenablesDefaultLighting = true

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

  // a geometry object
  let box = SCNBox(width: 1, height: 4, length: 9, chamferRadius: 0)
  let boxNode = SCNNode(geometry: box)
  scene.rootNode.addChildNode(boxNode)

  // configure the geometry object
  box.firstMaterial?.diffuse.contents  = UIColor.red
  box.firstMaterial?.specular.contents = UIColor.white

  // set a rotation axis (no angle) to be able to
  // use a nicer keypath below and avoid needing
  // to wrap it in an NSValue
  boxNode.rotation = SCNVector4(x: 1, y: 1, z: 0.0, w: 0.0)

  // animate the rotation of the torus
  let spin = CABasicAnimation(keyPath: "rotation.w") // only animate the angle
    spin.toValue = 2.0*Double.pi
  spin.duration = 10
  spin.repeatCount = HUGE // for infinity
  boxNode.addAnimation(spin, forKey: "spin around")

  view = sceneView // Set the view property to the sceneView created here.
}