SceneKit：具有多个摄像头的sceneView projectPoint

Question

如果一个场景包含多个摄像机，projectPoint方法使用哪个摄像机将点从3D投影到屏幕空间？如果这是由pointOfView属性定义的，那么当我更新pointOfView的位置时，给定的3D点仍被投影到相同的2D点怎么办？

Answer 1

由于SCNCamera属于SCNView，因此只需通过视图的“ pointOfView”实例属性将PoV设置为所需的摄像机节点即可。

let cameraNode001 = SCNNode()
cameraNode001.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode001)
cameraNode001.position = SCNVector3(x: 0, y: 0, z: 15)

let cameraNode002 = SCNNode()
cameraNode002.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode002)
cameraNode002.position = SCNVector3(x: 10, y: 10, z: 30)

let sceneView = self.view as! SCNView 
sceneView.scene = scene


sceneView.pointOfView = cameraNode001

然后您可以更改PoV：

sceneView.pointOfView = cameraNode002