Hi Sam,
Steam VR is all setup and I have been using it successfully for a few months now with 4.9.
Normally with 4.9, I don’t need to have steam vr open. I hit VR preview, and the mirror window pops up.
Often times I will then have to click in the mirror window to pop it into the HMD, but it’s working reliably.
In 4.10, if I run unreal without steamvr open, and hit vr preview, the mirror window pops up, but does not allow me to click it, and only shows my desktop background. If I run unreal with steamvr open, I start with all 5 green icons.But once I start unreal, the HMD icon turns red with the “Compositor is not fullscreen” warning. I can click on “make compositor fullscreen” and get everything back to green again, but as soon as I hit VR preview, the HMD icon goes back to red. The mirror window also does not allow me to click it. But instead of just my desktop, I do get the grey 3d steam test world, with the controllers tracking. But my scene won’t pop into the HMD and the controllers aren’t getting input in my scene. This same scene all works fine in 4.9.
Thanks for your help. I also have another issue with getting objects to recognize hit events from the controllers.
Here’s the post I made about that.