The Livelink connection in the FaceAR sample project is not linking?

Development Platform & Builds XR Development
1

We have followed the instructions for setting up the FaceAR Sample project (https://www.youtube.com/watch?v=AIHoDo7Y4_g) and have everything running.

However the Livelink does not seem to be activated: the Windows 10 app does not show any updates the iOS app should be sending out.
iOS does detect the face and updates within the app.

-> Both machines are on the same network and should be able to see each other. (Check with a small setup using OSC communication)
-> Tried this in 4.20.3 and 4.22.1
Do we need to add any special rules to the (Windows default) firewall?

In the docs (https://docs.unrealengine.com/en-US/…ple/index.html) it says:
"Launch your Project, and in Project Settings set Supports AR to On."
Searched back and forth but I cannot find this setting in the project settings, can this be the cause?

Thanks in advance for any tips which will push us in the right direction towards a working setup.

(cross posted here Unreal Engine Livestream - Introducing the FaceAR- August 9 - Live from Epic HQ - #27 by RogueSheep - Events - Unreal Engine Forums as I didn’t know where to place this)

2

For those ending up in this subject: one thing we found out: when the iOS app is build in 4.22, the Windows side also need to be running 4.22. A project running in 4.20 will not (properly?) receive any Live link input.

3

If you go on settings in the FaceAR app on the iPhone and choose the LiveLink connection, then with the correct ip-address, tap connect.

So, every time it doesn’t connect just tap connect again on the phone. I have to do it all the time.

4

Hello，Package successfully with 4.24， it’s not communicating with livelink on my PC,

  • Have you found a solution yet？
6

seems same problem :-(. have use windows cmd to ping my iphone, everything is ok, but i still cannot see any change in unreal project.

7

The problem is caused by the FaceAR app having no wireless data access. This might be a bug of iOS 13.

If you check your iPhone’s Settings->FaceARSample, there’s no Wireless Data entry.

When this happens, just disable Wifi on your iPhone, and relaunch the app. Then the app will ask for wireless access.

8

I’m having problems establishing connection / updating the face, after packaging. Works fine in-editor, 4.24.3. Windows

  • Matte Black Mocap’s “LiveLink” v. 1.2 app for iphone X

Questions I have asked myself:

  • Does it need to be packaged from a mac? Live link works with ipad for virtual cameras, so I suppose not. ??
  • Firewall? Made no difference.
  • Wifi? - Tried debugging by streaming a video. Task manager tells me that when connected in-editor, unreal sends about 0.2 mbit when connected to arkit. Build sends none.
  • Interference between build and editor? Tried running them seperately.
  • Tried “shipping” build configuration.

I’m not sure where to look next, so any input would be very appreciated!

9

Hello from NZ,
I was having a look around kiteboy face tracking demo, specifically FaceTrackingMap2 and Unreal Engine 4.25.3.

If you have the LiveLink Face app going and the map open in unreal - click window Livelink and you should see the readings coming through, but i couldn’t get the phone to drive the actor until i changed the name on the blueprint. So if your phone has a different name, Unreal doesn’t pick it up, mine was Als_iPhone… To fix this you need to go Content > KiteBoyHead_JointsAndBlends (double click) > Blueprint (Top Right Corner) > Move along to the first node graph (Live Link Pose) > Change Live Link Subject Name (to match your iphones name, found in the live link app settings >Live Link Subject name)

Or alternately you could just change your iphones name to match the unreal Editors iphone name.

Here’s a better link to that information i found after, doing it.
https://docs.unrealengine.com/en-US/…one/index.html

10

@Algillies hi,
@apelofff means the live link connection doesn’t work after the app packeged into a windows app.
I’m facing the same issue. Even play in a standalone game, the live link source can not be found.

11

**same issue
live link connection doesn’t work after the app packeged into a windows app.
Even play in game, and lanuch game. **