我正在自动创建多个节点,我想将它们围绕在我周围,因为目前我只将当前X位置增加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,我怎么能把所有人都围绕在身边而不是只排成一行?
你们中有人有一些数学函数吗?谢谢!
答案 0 :(得分:2)
使用以下代码(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)
}
}
}
P.S。这是用于创建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)
}
答案 1 :(得分:1)
这里需要一些数学运算
我如何准备圆节点
var nodes = [SCNNode]()
for i in 1...20 {
let node = createSphereNode(withRadius: 0.05, color: .yellow)
nodes.append(node)
node.position = SCNVector3(0,0,-1 * 1 / i)
scene.rootNode.addChildNode(node)
}
DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
self.arrangeNode(nodes: nodes)
}
func createSphereNode(withRadius radius: CGFloat, color: UIColor) -> SCNNode {
let geometry = SCNSphere(radius: radius)
geometry.firstMaterial?.diffuse.contents = color
let sphereNode = SCNNode(geometry: geometry)
return sphereNode
}
数学后面将视图排列成圆形
func arrangeNode(nodes:[SCNNode]) {
let radius:CGFloat = 1;
let angleStep = 2.0 * CGFloat.pi / CGFloat(nodes.count)
var count:Int = 0
for node in nodes {
let xPos:CGFloat = CGFloat(self.sceneView.pointOfView?.position.x ?? 0) + CGFloat(cosf(Float(angleStep) * Float(count))) * (radius - 0)
let zPos:CGFloat = CGFloat(self.sceneView.pointOfView?.position.z ?? 0) + CGFloat(sinf(Float(angleStep) * Float(count))) * (radius - 0)
node.position = SCNVector3(xPos, 0, zPos)
count = count + 1
}
}
注意:在第三张图像中,我已设置。
let xPos:CGFloat = -1 + CGFloat(cosf(Float(angleStep) * Float(count))) * (radius - 0)
let zPos:CGFloat = -1 + CGFloat(sinf(Float(angleStep) * Float(count))) * (radius - 0)
这意味着如果您需要在摄像机周围查看,则
使用CGFloat(self.sceneView.pointOfView?.position.x ?? 0)
或在随机位置提供值
输出