使用SceneKit进行ARKit广告牌效果

我希望添加类似于此应用程序的广告牌效果:https://twitter.com/marpi_/status/897130955105644544

我希望使用SCNText几何体的SCNodes始终面向相机.

我试图取得成功:

SCNLookAtConstraint与sceneView.pointOfView作为目标,但这会使节点面向远离摄像机的方向,从而导致向后文本,并且无法更改节点位置或欧拉角度.

开箱即用,SKLabelNode将始终面对ARKit中的相机,这正是我想要的,除了使用SCNText.

你应该看看SCNBillboardConstraint

更新的代码

let textGeometry = SCNText(string: "Hello, World!", extrusionDepth: 1.0)
textGeometry.fOnt= UIFont(name: "Arial", size: 2)
textGeometry.firstMaterial!.diffuse.cOntents= UIColor.red
let textNode = SCNNode(geometry: textGeometry)

// Update object's pivot to its center
// /sf/ask/17360801/
let (min, max) = textGeometry.boundingBox
let dx = min.x + 0.5 * (max.x - min.x)
let dy = min.y + 0.5 * (max.y - min.y)
let dz = min.z + 0.5 * (max.z - min.z)
textNode.pivot = SCNMatrix4MakeTranslation(dx, dy, dz)

textNode.scale = SCNVector3(0.01, 0.01, 0.01)

let plane = SCNPlane(width: 0.2, height: 0.2)
let blueMaterial = SCNMaterial()
blueMaterial.diffuse.cOntents= UIColor.blue
plane.firstMaterial = blueMaterial
let parentNode = SCNNode(geometry: plane) // this node will hold our text node

let yFreeCOnstraint= SCNBillboardConstraint()
yFreeConstraint.freeAxes = .Y // optionally
parentNode.cOnstraints= [yFreeConstraint] // apply the constraint to the parent node

parentNode.position = SCNVector3(0, 0, -0.5)
parentNode.addChildNode(textNode)

sceneView.scene.rootNode.addChildNode(parentNode) // add our text holder to the scene