我在 ARKit 中运行这个，如果你尝试一下，三角形会出现(非常高(，2 在相机的右侧，稍微平移一下。我遇到的问题是我无法将图像材质应用于对象，我可以更改它的颜色，但不能应用图像：
所以这有效：
triangle.firstMaterial?.diffuse.contents = UIColor.red
但这不会：
triangle.firstMaterial?.diffuse.contents = UIImage(named: "wallpaper.jpg")
以下是来自 Xcode9 中全新 ARKit 项目的完整 ViewController 代码：
import UIKit
import SceneKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
override func viewDidLoad() {
super.viewDidLoad()
sceneView.delegate = self
let scene = SCNScene()
let triangle = SCNGeometry.triangleFrom(vector1: SCNVector3(x: 0.059511181, y: -0.181795284, z: -0.0939711183), vector2: SCNVector3(x: 0.113824688, y: -0.181780666, z: -0.0674673915), vector3: SCNVector3(x: 0.113824688, y: 1.8182193, z: -0.0674673915))
triangle.firstMaterial?.diffuse.contents = UIImage(named: "wallpaper.jpg")
let triangleNode = SCNNode(geometry: triangle)
triangleNode.name = "Triangle"
scene.rootNode.addChildNode(triangleNode)
sceneView.scene = scene
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARWorldTrackingSessionConfiguration()
// Run the view's session
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
sceneView.session.pause()
}
}
extension SCNGeometry {
class func triangleFrom(vector1: SCNVector3, vector2: SCNVector3, vector3: SCNVector3) -> SCNGeometry {
let indices: [Int32] = [0, 1, 2]
let source = SCNGeometrySource(vertices: [vector1, vector2, vector3])
let element = SCNGeometryElement(indices: indices, primitiveType: .triangles)
return SCNGeometry(sources: [source], elements: [element])
}
}
我唯一没有包括的是纹理图像，但下载的任何图像都可以。
谢谢
为了能够将纹理映射到几何体上，除了顶点的位置外，SceneKit 还需要具有语义.texcoord的几何体源。