Live Link VRPN cannot recognize multiple tracking targets

Development Pipeline & Plugins Plugins
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I’m trying to pass the tracking information of 3 targets obtained by DTrack of ar-tracking to Live Link VRPN via VRPN server, but it doesn’t work.

When I check the information in the VRPN utility, three objects and button input and joystick input are recognized.

In VRPN in nDisplay of UE4.26, the mapping of 3 objects was done normally. (Assigned as Head, Hand, Wand)

Only one target is displayed in the tracker information in the Live Link window of UE4.27.
When I check the frame information, the position information and angle information have changed significantly even though I haven’t moved the target.

Is it possible that Live Link VRPN cannot divide the measurement information of three targets and recognizes them as one target?

Does anyone use Live Link VRPN to accurately recognize multiple targets sent by the VRPN server?

Thank you,

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hi malchin_san,
I was fighting with exactly the same problem;
I understood that, in UE 4.27, it must be done using the “device name” input field of Livelink/Add Source/ Livelink VRPN source/Connection settings but I wasn’t able to find the right syntax.
Documentation is available only for Steam VR trackers and nothing for ART Dtrack so I stopped working on VRPN and moved to the Dtrack Plugin for UE.
It is on github, you can download and compile it.

if You found a solution for VRPN please let me know

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hi BrunoMore-san,
Thank you for your information.
I alone couldn’t get to the information you knew. thank you.