ios - SceneKit 使用两个向量设置旋转

Question

我正在寻找一种在 SceneKit 中轻松旋转 SCNNode 的方法。因此，假设我有两个向量 h = (1 0 0) 和 u = (0 1 0)。 h(在我看来)指向节点前进的方向，而u指向上方。

旋转后，我希望 h 为 h' = (0 5 1) 且 u 为 u' = (0 -1 -5) 。所以两个向量之间的角度仍然是 90 度。

我怎样才能像这样旋转我的SCNNode？

Answer 1

我不确定你到底想做什么，但基本上你所做的是(将代码放在 PlayGround 中):

import UIKit
import SceneKit
import PlaygroundSupport

let scnView = SCNView(frame: CGRect(x: 0, y: 0, width: 500, height: 500))
scnView.autoenablesDefaultLighting = true

let scene = SCNScene()
scnView.scene = scene

let light = SCNLight()
light.type = .directional
let lightNode = SCNNode()
lightNode.light = light
scene.rootNode.addChildNode(lightNode)

let camera = SCNCamera()
let cameraNode = SCNNode()
cameraNode.camera = camera
cameraNode.position = SCNVector3(0,0,10)
scene.rootNode.addChildNode(cameraNode)

let box = SCNBox(width: 1, height: 1, length: 1, chamferRadius: 0)
let boxNode = SCNNode(geometry: box)
boxNode.geometry?.firstMaterial?.diffuse.contents = UIColor.red
scene.rootNode.addChildNode(boxNode)

let rotateAction = SCNAction.rotateBy(x: 0, y: -1, z: 5, duration: 1)
let repeatAction = SCNAction.repeatForever(rotateAction)
SCNTransaction.begin()
SCNTransaction.animationDuration = 1
boxNode.runAction(repeatAction)
SCNTransaction.commit()

PlaygroundPage.current.liveView = scnView