Summary:
In Unreal 4.18.3, if you turn on the 6th Lighthouse-tracked device (2 Motion Controllers and 4 Vive Trackers), the Editor crashes. Likewise, if you already have the 6 tracked devices on while starting the Editor, it crashes at startup.
Reproducability:
100% on my work PC.
Notes:
Neither does this happen on 4.16.3 on my PC, nor with 5 devices on in 4.18.3. It is also independant of the order in which the devices get turned on.
Steps to reproduce:
Option A:
- Start Steam
- Start Steam VR
- Pair 2 Motion Controllers and 4 Vive Trackers to the PC
- Turn all 6 devices off
- Start an Unreal 4.18.3 project
- Open a map
- Observe how the editor runs fine
- Turn on 5 devices in any order
- Observe how the editor still works fine
- Turn the 6th device on
- Observe how the editor crashes
Option B:
- Start Steam
- Start Steam VR
- Pair 2 Motion Controllers and 4 Vive Trackers to the PC
- Turn all 6 devices on
- Start an Unreal 4.18.3 project
- Observe how the editor crashes right after finishing loading