swift - 将 SCNNode 排列成圆形

Question

我正在自动创建多个节点，并且我想将它们安排在我周围，因为目前我只是将当前 X 位置增加了 0.1。

capsuleNode.geometry?.firstMaterial?.diffuse.contents = imageView
capsuleNode.position = SCNVector3(self.counterX, self.counterY, self.counterZ)
capsuleNode.name = topic.name
self.sceneLocationView.scene.rootNode.addChildNode(capsuleNode)
self.counterX += 0.1

所以问题是，我怎样才能让所有这些都在我身边，而不是仅仅在一条线上？

你们中有人对此有一些数学功能吗？谢谢！

标签： swiftscenekitaugmented-realityarkitscnnode

Answer 1

使用此代码（macOS 版本）对其进行测试：

import SceneKit

class GameViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let scene = SCNScene()
        let scnView = self.view as! SCNView
        scnView.scene = scene
        scnView.allowsCameraControl = true
        scnView.backgroundColor = NSColor.black

        for i in 1...12 {  // HERE ARE 12 SPHERES

            let sphereNode = SCNNode(geometry: SCNSphere(radius: 1))
            sphereNode.position = SCNVector3(0, 0, 0)

            // ROTATE ABOUT THIS OFFSET PIVOT POINT
            sphereNode.simdPivot.columns.3.x = 5
            sphereNode.geometry?.firstMaterial?.diffuse.contents = NSColor(calibratedHue: CGFloat(i)/12, 
                                                                              saturation: 1, 
                                                                              brightness: 1,                
                                                                                   alpha: 1)

            // ROTATE ABOUT Y AXIS (STEP is 30 DEGREES EXPRESSED IN RADIANS)
            sphereNode.rotation = SCNVector4(0, 1, 0, (-CGFloat.pi * CGFloat(i))/6)
            scene.rootNode.addChildNode(sphereNode)
        }
    }
}

PS这是创建90个球体的代码：

for i in 1...90 {

    let sphereNode = SCNNode(geometry: SCNSphere(radius: 0.1))
    sphereNode.position = SCNVector3(0, 0, 0)
    sphereNode.simdPivot.columns.3.x = 5
    sphereNode.geometry?.firstMaterial?.diffuse.contents = NSColor(calibratedHue: CGFloat(i)/90, saturation: 1, brightness: 1, alpha: 1)
    sphereNode.rotation = SCNVector4(0, 1, 0, (-CGFloat.pi * (CGFloat(i))/6)/7.5)
    scene.rootNode.addChildNode(sphereNode)
}