ARKit:在屏幕上查找SCNNode的坐标 [英] ARKit: Finding the coordinates of a SCNNode on the screen

问题描述

我有一个简单的Swift ARKit设置，其中有一个带有3D对象的SCNNode，该对象在ARSCNView中可见.

I have a simple Swift ARKit setup where I have a SCNNode with a 3D object that is visible in an ARSCNView.

我想确定该对象在ARSCNView上的2D坐标.我的意思是指将对象绘制到屏幕上时的x和y坐标.

I want to determine the 2D coordinates of this object on the ARSCNView. By this I mean the x- and y-coordinates the object has when it is drawn onto the screen.

我提供了一个草图来说明我的意思:

I have provided a sketch to illustrate what I mean:

有没有办法获得这些坐标，或者至少是一个近似值?我需要这样做，以便对相机框架做进一步的处理.基本上，我对对象在屏幕上占据的区域感兴趣.

Is there a way to get these coordinates, or at least an approximation? I need this in order to do some further processing with the camera frame. Basically I am interested in the area the object occupies on the screen.

推荐答案

您可以使用

You can use SCNSceneRenderer projectPoint:point :

将点从场景的3D世界坐标系投影到渲染器的2D像素坐标系.

Projects a point from the 3D world coordinate system of the scene to the 2D pixel coordinate system of the renderer.

let node:SCNNode = // Your node
let nodeWorldPosition = node.position
let nodePositionOnScreen = renderer.projectPoint(nodeWorldPosition)
let x = nodePositionOnScreen.x
let y = nodePositionOnScreen.y

注意:从近(resp.far)裁剪平面投影的点的z分量将为0(resp.1).

ARAnchor可以使用相同的方法:

The same method can be used with ARAnchor :

let anchor:ARAnchor = // ...
let anchorWorldPosition = SCNVector3(anchor.transform.columns.3)
let anchorPositionOnScreen = renderer.projectPoint(anchorWorldPosition)
let x = anchorPositionOnScreen.x
let y = anchorPositionOnScreen.y

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