我在iOS 12 (16A5288q)下使用ARKit 2,使用Xcode10Beta6构建,在iPhone X上运行,lookAtPoint
总是零。
我使用以下命令访问面部数据(在Swift中):
func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
guard let faceAnchor = anchor as? ARFaceAnchor else { return }
FaceAnchorsProcessedCount = FaceAnchorsProcessedCount + 1
let rightEyeTransform: simd_float4x4 = faceAnchor.rightEyeTransform
let leftEyeTransform: simd_float4x4 = faceAnchor.leftEyeTransform
let lookAtPoint: simd_float3 = faceAnchor.lookAtPoint
}
我得到的数据如下:
rightEyeTransform simd_float4x4 \n[ [9.999874e-01, 0.000000e+00, 5.010252e-03, -3.208227e-02],\n [2.375229e-04, 9.988756e-01, -4.740678e-02, 2.703529e-02],\n [-5.004618e-03, 4.740737e-02, 9.988630e-01, 2.525132e-02],\n [0.000000e+00, 0.000000e+00, 0.000000e+00, 1.000000e+00] ]\n
leftEyeTransform simd_float4x4 \n[ [9.978353e-01, 0.000000e+00, -6.576237e-02, 3.208223e-02],\n [-3.110934e-03, 9.988804e-01, -4.720329e-02, 2.703534e-02],\n [6.568874e-02, 4.730569e-02, 9.967182e-01, 2.525137e-02],\n [0.000000e+00, 0.000000e+00, 0.000000e+00, 1.000000e+00] ]\n
lookAtPoint simd_float3 (0.000000e+00, 0.000000e+00, 0.000000e+00)
我做错了什么?或者这是一个已知的bug?
更新2018年10月4日我今天做了一个简单的lookAtPoint
测试。我把脸靠近听筒,然后又移得更远,再一次靠近听筒。lookAtPoint的最小z为38.59英寸,最大为39.17英寸(从米转换而来)。
用卷尺测量的实际距离为~4.5英寸和~33英寸。
苹果公司宣称,lookAtPoint
将“……相对于面部,估计用户的眼睛聚焦在哪个点上。”似乎是不正确的。
发布于 2018-08-24 09:17:33
是的,我一个月前就试过了,我可以说你是绝对正确的--在那一刻,lookAtPoint
实例属性不起作用,甚至连存根都没有。现在它总是返回float3(0.0, 0.0, 0.0)
。
我猜苹果还没有实现它(它还处于测试状态)。Cross eyes' detection
是一个ARKit的特性,我们似乎会在iOS 12最终稳定版中看到它。
目前我没有Mac,也不能检查它,所以尝试使用具有如下开放实例属性的open class
:
open class ARFaceAnchor: ARTrackable {
open var leftEyeTransform: simd_float4x4 { get }
open var rightEyeTransform: simd_float4x4 { get }
open var lookAtPoint: simd_float3 { get }
}
希望它能帮上忙!
发布于 2018-09-18 07:27:21
今天,与XCode 10 (替代测试版)一起发布了iOS 12。我用这些新版本测试了访问lookAtPoint
,现在正在填充向量。
Swift代码:
func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
guard let faceAnchor = anchor as? ARFaceAnchor else { return }
let lookAtPoint: simd_float3 = faceAnchor.lookAtPoint
os_log("lookAtPoint: %.12f,%.12f,%.12f", type: .debug, lookAtPoint.x, lookAtPoint.y, lookAtPoint.z)
日志输出:
2018-09-17 16:17:12.097369-0700 EyeSync[512:41060] lookAtPoint: 0.049317009747,-0.004630976822,0.981833696365
2018-09-17 16:17:12.113925-0700 EyeSync[512:41060] lookAtPoint: 0.050239805132,-0.006484962534,0.981752157211
2018-09-17 16:17:12.130867-0700 EyeSync[512:41060] lookAtPoint: 0.051697697490,-0.011350239627,0.981206715107
2018-09-17 16:17:12.147272-0700 EyeSync[512:41060] lookAtPoint: 0.052744854242,-0.012763299979,0.981896817684
2018-09-17 16:17:12.163683-0700 EyeSync[512:41060] lookAtPoint: 0.054889015853,-0.015469233505,0.982917487621
2018-09-17 16:17:12.180636-0700 EyeSync[512:41060] lookAtPoint: 0.056391790509,-0.017265520990,0.983718335629
2018-09-17 16:17:12.197387-0700 EyeSync[512:41060] lookAtPoint: 0.059109147638,-0.018527992070,0.983208477497
2018-09-17 16:17:12.214021-0700 EyeSync[512:41060] lookAtPoint: 0.061453290284,-0.019032688811,0.981536626816
2018-09-17 16:17:12.230689-0700 EyeSync[512:41060] lookAtPoint: 0.063107110560,-0.019657038152,0.978309571743
https://stackoverflow.com/questions/51995867
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