Question

我对Swift和SceneKit还是很陌生，我目前的问题是，即使框架中的原始形状显示得很好，我尝试创建的自定义形状也没有显示出来。

我一直在关注https://www.raywenderlich.com/1261-scene-kit-tutorial-with-swift-part-1-getting-started的教程。

我还检查了答案SceneKit – Custom geometry does not show up。我在这里查看了其他答案，但没有一个对我有用。

这是我的代码：

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <script src="https://d3js.org/d3.v5.js"></script>
  </head>
  <body>
    <script>
d3.json("buildings.json").then(data => console.log(data))
    </script>
  </body>
</html>

这是产生自定义形状的函数：

import UIKit
import SceneKit
import QuartzCore

class GameViewController: UIViewController {
    var scnView: SCNView!
    var scnScene: SCNScene!
    var cameraNode: SCNNode!

    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
        setupScene()
        setupCamera()
        let lightNode0 = SCNNode()
        lightNode0.light = SCNLight()
        lightNode0.light!.type = .omni
        lightNode0.position = SCNVector3(x: 0, y: 10, z: 10)
        scnScene.rootNode.addChildNode(lightNode0)

        let lightNode1 = SCNNode()
        lightNode1.light = SCNLight()
        lightNode1.light!.type = .omni
        lightNode1.position = SCNVector3(5, -10, 0)
        scnScene.rootNode.addChildNode(lightNode1)
        spawnShape()
    }

    func shouldAutorotate() -> Bool {
        return true
    }

    func prefersStatusBarHidden() -> Bool {
        return true
    }
    func setupView() {
        scnView = self.view as! SCNView
        // 1
        scnView.showsStatistics = true
        // 2
        scnView.allowsCameraControl = true
        // 3
        scnView.autoenablesDefaultLighting = true
    }
    func setupScene() {
        scnScene = SCNScene()
        scnView.scene = scnScene
    }

    func setupCamera() {
        // 1
        cameraNode = SCNNode()
        // 2
        cameraNode.camera = SCNCamera()
        // 3
        cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
        // 4
        scnScene.rootNode.addChildNode(cameraNode)
    }

Answer 1

尝试我的轻量代码（用于快速测试的macOS版本）。

正在工作：

import SceneKit

class GameViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let scene = SCNScene()
        let cameraNode = SCNNode()
        cameraNode.camera = SCNCamera()
        scene.rootNode.addChildNode(cameraNode)
        cameraNode.position = SCNVector3(x: 0, y: 0, z: 3)

        let geometry: SCNGeometry?
        let positions = [
            SCNVector3(0, 1, 0),
            SCNVector3(-0.5, 0, 0.5),
            SCNVector3(0.5, 0, 0.5),
            SCNVector3(0.5, 0, -0.5),
            SCNVector3(-0.5, 0, -0.5),
            SCNVector3(0, -1, 0),
        ]
        let source = SCNGeometrySource(vertices: positions)
        let indices: [UInt32] = [
            0, 1, 2,
            2, 3, 0,
            3, 4, 0,
            4, 1, 0,
            1, 5, 2,
            2, 5, 3,
            3, 5, 4,
            4, 5, 1
        ]
        let element = SCNGeometryElement(indices: indices, primitiveType:.triangles)
        geometry = SCNGeometry(sources: [source], elements: [element])
        geometry!.firstMaterial?.diffuse.contents = NSColor.red
        let geometryNode = SCNNode(geometry: geometry)
        scene.rootNode.addChildNode(geometryNode)

        let scnView = self.view as! SCNView
        scnView.scene = scene
        scnView.allowsCameraControl = true
        scnView.autoenablesDefaultLighting = true
        scnView.backgroundColor = NSColor.black
    }
}

SceneKit自定义几何形状未显示

1 个答案: