以米为单位获取SCNNode边界大小 [英] Getting SCNNode Bounding Size in Meters

问题描述

我正在尝试将SCNPlane包裹在SCNNode周围.我正在使用ARKit，因此所有内容均以米为单位进行度量，但是当我得到boundingBox时，我会以其他单位获得度量.我查看了Apple的文档，但没有指定单位是什么.

I'm trying to wrap an SCNPlane around a SCNNode. I'm using ARKit so everything is measured in meters, but when I get the boundingBox, I get measurements in some other unit. I looked at Apple's documentation, and they don't specify what the units are.

例如，其中一个节点大约3米宽，但是它说有26个单位.

For example, one of nodes is roughly 3 meters wide, but it says its 26 units.

我可以做一个粗略的除法以获得一个常数，并使用该常数进行单位转换，但是我想知道是否有一种更简单的方法?

I could do a rough division to get a constant and use that to do the unit conversions, but I was wondering if there's a less hacky way to do it?

let textContainerSize = textBodyNode.boundingBox
let xSize = textContainerSize.max.x - textContainerSize.min.x
let ySize = textContainerSize.max.y - textContainerSize.min.y
print("size")
print(xSize, ySize) // <-- returns (26,2) 
let planeGeometry = SCNPlane(width: xSize, height: ySize)

推荐答案

在ARKit中，一个SceneKit单位为一米，但

One SceneKit unit is one meter in ARKit but the boundingBox is defined in the nodes local coordinate system. So your node probably has a parent with a scale different from 1.

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