SceneKit相机围绕物体旋转

我正在试图制作一个围绕物体旋转的相机。因此相机应该连接到一个球体。对于我发现这堆在那里的家伙解释了如何做一个设置：Rotate SCNCamera node looking at an object around an imaginary sphere SceneKit相机围绕物体旋转

我的问题是相机的Z轴。我可以绕X轴和Y旋转，但不在身边Z.

这里是我的代码：

class SceneManager 
{ 
private let scene: SCNScene 
private let view: SCNView 
private let cameraOrbit: SCNNode 
private var cameraOrbitLastRatioWidth: Float = 0 
private var cameraOrbitLastRatioHeight: Float = 0.2 
private var maxWidthRatioRight: Float = 0.2 
private var maxWidthRatioLeft: Float = -0.2 
private var maxHeightRatioXDown: Float = 0.02 
private var maxHeightRatioXUp: Float = 0.4 

init(view: SCNView, assetFolder: String, sceneName: String, cameraName: String, backgroundColor: UIColor) { 
    self.view = view 
    self.scene = SCNScene(named: (assetFolder + "/" + sceneName))! 
    self.view.pointOfView = self.scene.rootNode.childNodeWithName(cameraName, recursively: true) 
    if self.view.pointOfView == nil { 
     print("Error: Inexistent camera specified in init SceneManager") 
     exit(1) 
    } 
    self.cameraOrbit = SCNNode() 
    self.cameraOrbit.addChildNode(self.view.pointOfView!) 
    self.scene.rootNode.addChildNode(self.cameraOrbit) 
    let panGesture = UIPanGestureRecognizer(target: self, action: #selector(panHandler(_:))) 
    panGesture.maximumNumberOfTouches = 1 
    self.view.allowsCameraControl = false 
    self.view.addGestureRecognizer(panGesture) 
    self.view.backgroundColor = backgroundColor 
    self.view.scene = self.scene 
} 

@objc private func panHandler(sender: UIPanGestureRecognizer) { 
    let translation = sender.translationInView(sender.view!) 
    let ratioWidth = Float(translation.x)/Float(sender.view!.frame.size.width) + self.cameraOrbitLastRatioWidth 
    let ratioHeight = Float(translation.y)/Float(sender.view!.frame.size.height) + self.cameraOrbitLastRatioHeight 
    if (sender.state == UIGestureRecognizerState.Changed) { 
     if self.cameraOrbitLastRatioWidth >= maxHeightRatioXUp { 
      self.cameraOrbitLastRatioWidth = maxHeightRatioXUp 
     } 
     if self.cameraOrbitLastRatioWidth <= maxHeightRatioXDown { 
      self.cameraOrbitLastRatioWidth = maxHeightRatioXDown 
     } 
     if self.cameraOrbitLastRatioHeight >= maxWidthRatioRight { 
      self.cameraOrbitLastRatioHeight = maxWidthRatioRight 
     } 
     if self.cameraOrbitLastRatioHeight <= maxWidthRatioLeft { 
      self.cameraOrbitLastRatioHeight = maxWidthRatioLeft 
     } 
     self.cameraOrbit.eulerAngles.y -= Float(M_PI_4 * 3) * ratioWidth 
     self.cameraOrbit.eulerAngles.x -= Float(M_PI_4) * ratioHeight 
    } 
    if (sender.state == UIGestureRecognizerState.Ended) { 
     self.cameraOrbitLastRatioWidth = ratioWidth 
     self.cameraOrbitLastRatioHeight = ratioHeight 
    } 
} 
}

如果任何人有一个想法，那将是非常欢迎;-)

来源

2016-07-20 Silvering

你需要的额外的手势识别器（可能是一个UIRotationGestureRecognizer）来旋转摄像机在其自己的Z轴（有效地旋转中心周围的视图）。

来源

2016-07-20 19:42:47

SceneKit相机围绕物体旋转

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