将场景的（x，y）转换为屏幕的（x，y） [英] Convert Scene's (x, y) to screen's (x, y)

问题描述

我有一个使用SceneKit构建的应用程序，当前正在显示多个节点。我可以弄清楚哪个节点被按下并想要使用它来使标签出现在被触摸的节点下方。现在，当我按照以下方式设置标签的中心时......

I have an application built with SceneKit that is currently displaying several nodes. I can figure out which node is pressed and want to use that to make a label appear below the Node that was touched. Now, when I set the label's center the following way...

nameLabel.center = CGPointMake(CGFloat(result.node.position.x), CGFloat(result.node.position.y+20)

...它出现在自节点在（1,0）以来的左上角。我想的是 sceneView的 （0 ，0）位于屏幕的中心，而实际物理显示的（0,0）位于左上角。

…it appears in the upper left corner since the node is on (1, 0). What I figured is that the sceneView's (0, 0) is in the center of the screen while the actual physical display's (0, 0) is in the top left corner.

有没有办法将两个不同的数字相互转换？（我可以硬编码，因为我知道Node的位置或为每个节点创建一个单独的标签，但这不是一个完美的解决方案。）

Is there a way to convert the two different numbers into each other? (I could hardcode since I know where the Node's are or create a separate label for each Node but that is not really a perfect solution.)

提前感谢：）

推荐答案

您可以使用 projectPoint：方法：

var projected = view.projectPoint(result.node.position))   
//projected is an SCNVector3
//projected.x and y are the node's position in screen coordinates
//projected.z is its depth relative to the near and far clipping planes
nameLabel.center = CGPointMake(CGFloat(projected.x), CGFloat(projected.y+20)

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