How to show rectanlge boxes for each faces that is detected in Microsoft Hololens

Frebin

This is my current code that will show a rectangle for each faces. This code will work when the detected face stands exactly in center of Hololens, otherwise it fails to show the rectangle in correct position.
This also happens when it detect multiple faces from frame.

foreach (DetectedFace face in detectedFaces)
{
var cameraToWorldMatrix = Camera.main.cameraToWorldMatrix;
cameraPosition = cameraToWorldMatrix.MultiplyPoint3x4(new Vector3(0, 0, -1));
cameraRotation = Quaternion.LookRotation(-cameraToWorldMatrix.GetColumn(2), cameraToWorldMatrix.GetColumn(1));
Matrix4x4 projectionMatrix = Camera.main.projectionMatrix;
Matrix4x4 pixelToCameraMatrix = projectionMatrix.inverse;
float top = -((float)face.FaceBox.Y / (float)cameraResolution.height - .5f);
float left = (float)face.FaceBox.X / (float)cameraResolution.width - .5f;
float width = (float)face.FaceBox.Width / ((float)cameraResolution.width / 2f);
float height = (float)face.FaceBox.Height / ((float)cameraResolution.height / 2f);
GameObject faceBounds = (GameObject)Instantiate(framePrefab);
faceBounds.transform.position = cameraToWorldMatrix.MultiplyPoint3x4(pixelToCameraMatrix.MultiplyPoint3x4(new Vector3(left, top, 0)));
faceBounds.transform.rotation = cameraRotation;
Vector3 scale = pixelToCameraMatrix.MultiplyPoint3x4(new Vector3(width, height, 0));
scale.z = .1f;
faceBounds.transform.localScale = scale;
faceBounds.tag = "faceBounds";
}

nrenaud

I want to exactly do that, did you succeed doing it ?