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我有几个SCNText节点以下,说明如下:的iOS SceneKit:TextNode相机
let newText = SCNText(string: "", extrusionDepth:0.1)
newText.alignmentMode = kCAAlignmentCenter
newText.font = UIFont (name: "Arial", size: 3)
textNode = SCNNode(geometry: newText)
self.addChildNode(textNode)
如何使这样文本总是看着镜头?