SceneKit使用兩個矢量設置旋轉

Question

我正在尋找一種輕鬆旋轉SceneKit中的SCNNode的方法。所以我們假設我有兩個矢量h = (1 0 0)和u = (0 1 0)。 （在我的腦海中）指向節點正在前進的方向，而u指向上。

旋轉後我想h爲h' = (0 5 1)和u爲u' = (0 -1 -5)。所以兩個矢量之間的角度仍然是90度。

如何旋轉我的SCNNode那樣？

Answer 1

我不知道你想做什麼，但基本上你做的是（把在操場的代碼）：

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