An add-on for Kerbal Space Program (KSP) to enable the use of a virtual reality headset (HTC Vive, Oculus Rift, etc), as supported by OpenVR.

Built for KSP v1.1.3

This mod does not work on KSP 1.2, or 1.3, due to some breaking changes in the engine. See issue #7.

Demonstration video

This is an early WIP mod to allow the use of the HTC Vive (and potentially any HMD supported by the OpenVR SDK) in KSP. The primary focus is for use in IVA. Head-tracking works, but displaying the game screen on the HMD currently has caveats.

Currently testing with:

• HTC Vive
• Windows 10
• Intel Core i5-6600K (overclocked to 4.1GHz)
• EVGA GeForce GTX 970 4GB GDDR5 (04G-P4-3975-KR)
• 16GB DDR4 (PC4-17000)
• SteamVR / OpenVR SDK (beta version 1468542587)

This KerbalVR plugin captures the orientation information from the HMD and translates it into head-tracking movement (position & rotation). It will also render the IVA view directly into the HMD. However, rendering is slow, even on a decent rig that I'm testing with. Maybe needs some code re-work to reduce inefficiencies. But even with all graphics settings set to low, I can only get about 40-60 fps, which makes for a nauseating VR experience.

It's still fairly playable for short amounts of time. I'd also recommend installing the RasterPropMonitor mod to make it easier to navigate your craft in IVA. However be warned, I've seen the game crash randomly while using VR. Not sure if it's KSP-specific issues, or VR-related issues.

While in VR, your viewpoint is not limited to being inside the cockpit. If you have the proper setup and space to move around irl, you can actually "walk" outside your craft and see it from outside (and it's way cooler than what I can describe here).

Somehow VR will only work with KSP using OpenGL, i.e. you need to use the "-force-opengl" flag on the executable. It will not work if you try to run KSP normally, nor with the "-force-d3d11" flag (even with the OpenVR function calls set up to use DirectX rendering). To enable the OpenGL flag, create a Shortcut to either KSP.exe or KSP_x64.exe, and on the shortcut Properties, append "-force-opengl" to the Target, e.g.:

Target: C:\Games\KSP_win\KSP_x64.exe -force-opengl

1. Download the latest KerbalVR release.
2. Copy the KerbalVR folder into your KSP GameData folder. The KerbalVR folder contains KerbalVR.dll.
3. Copy openvr_api.dll into the root of the KSP directory, i.e. openvr_api.dll should be next to KSP.exe and KSP_x64.exe. Use either the 32- or 64-bit version of openvr_api.dll, according to your bit-version of Windows.

Should look something like this:

+-- Game Data
|   +-- KerbalVR
|   |   +-- KerbalVR.dll                     <-- MAKE SURE THIS IS HERE
|   +-- Squad
|   +-- <other mods>
+-- KSP.exe
+-- KSP_x64.exe
+-- openvr_api.dll                           <-- MAKE SURE THIS IS HERE
+-- <other KSP files/directories>

Instructions:

1. Start SteamVR
2. Start up KSP with the "-force-opengl" flag
3. During flight, enter IVA, and press the 'Y' key to initialize the HMD
4. You can press 'Y' again to reset the default position
5. Any errors should come up in the Debug log (press Alt-F12)