VRPN-FreeD-OpenVR

VRPN and FreeD server for OpenVR (based on a VRPN-OpenVR from https://github.com/zhouhs88/vrpn-openvr)

Acknowledgements

VRPN-OpenVR project https://github.com/zhouhs88/vrpn-openvr

Downloads

Latest build available for download from http://research.m1stereo.tv/ue/VRPN-FreeD-OpenVR.7z

Usage

This version of VRPN server provide original functionality of VRPN-OpenVR and some more usefull functions for using with UE4 (Unreal Engine) VRPN and FreeD services.

It is recommended to use .bat file to run server. For example:

VRPN-FreeD-OpenVR.exe ^
    port 3885 ^
    ref 0.0 0.0 1.51 ^
    cam CAMERA-78 LHR-971C5478 0.0 0.0 -0.4 ^
        freed 127.0.0.1:20000 ^
        freed 10.1.5.221:20001 ^
    cam TRACKER-78 LHR-971C5478 0.0 0.0 0.0 ^
        freed 127.0.0.1:20000 ^
        freed 10.1.5.221:20002 ^
    cam CAMERA-54 LHR-731BED54 0.0 0.0 -0.4 ^
        freed 127.0.0.1:20000 ^
        freed 10.1.5.221:20003 ^
    cam TRACKER-54 LHR-731BED54 0.0 0.0 0.0 ^
        freed 127.0.0.1:20000 ^
        freed 10.1.5.221:20004

Where:

• port 3885 - TCP port to listen for VRPN server
• ref 0.0 0.0 1.51 - reference point coordinate (in UE coordiantes X, Y, Z)
• cam CAMERA-78 LHR-971C5478 0.0 0.0 -0.4 - adding a virtual camera with name CAMERA-78 (it will be availabe with VRPN name virtual/CAMERA-78@127.0.0.1:3885), that assigned to tracker/controller with serial LHR-971C5478 and it (camera's) nodal point shifted with vector 0.0 0.0 -0.4 (X, Y, Z) (40cm bellow tracker)
• freed 127.0.0.1:20000 - request to send FreeD data packes to host 127.0.0.1 on UDP port 20000

After starting application it will display all it works and status in a text console:

Virtual Space Calibration

That is actually a main goal of this app. Virtual space's camera coordinates and rotation are in terms of UE4 (this mean no need to remap axis for using it). Calibration of virtual space performed by putting tracking into Real space position that relates to virtual space ref point specified at argument. Tracker should look forward to X axes. After putting tracker into reference position, you need to press a key that relates to tracker's index. On a screen above it is 1.

UE4 integration

nDisplay has support for VRPN. But if you need to use it in Editor, you can use LiveLink plugins:

• https://github.com/max-verem/VRPNLiveLink
• https://github.com/max-verem/FreeDLiveLink