VirtualHMD_OpenVR

• This project is developed based on the VRto3D and OpenVR-OpenTrack, with functionality fully similar to the UDP version of OpenVR-OpenTrack. It fixes the red screen problem and mirror shifting problem in VRChat, and you can use the same way to send the position and rotation data of HMD to this driver.

Configuration

• VRto3D has to be installed and SteamVR launched once for this config file to show up
• Modify the Documents\My Games\vrto3d\default_config.json for your setup
• Most changes made to this configuration require a restart of SteamVR to take effect

Field Name	Type	Description	Default Value
window_width	int	The width of the application window.	1920
window_height	int	The height of the application window.	1080
render_width	int	The width to render per eye (can be higher or lower than the application window)	1920
render_height	int	The height to render per eye (can be higher or lower than the application window)	1080
hmd_height +	float	The height of the simulated HMD.	1.0
aspect_ratio	float	The aspect ratio used to calculate vertical FoV	1.77778
fov	float	The field of view (FoV) for the VR rendering.	120.0
depth +	float	The max depth. Overrides VR's IPD field.	0.5
convergence +	float	Where the left and right images converge. Adjusts frustum.	0.02
debug_enable	bool	Borderless Windowed. Not 3DVision compatible. Breaks running some mods in OpenVR mode.	true
display_latency	float	The display latency in seconds.	0.011
display_frequency	float	The display refresh rate, in Hz.	60.0
user_depth +	float	The depth value for user setting # (replace # with integer number)	0.0
user_convergence +	float	The convergence value for user setting # (replace # with integer number)	0.0

Base Installation

• Install SteamVR
• Download the latest release and copy the VirtualHMD folder to your Steam\steamapps\common\SteamVR\drivers folder
• Launch SteamvR once to generate the default_config.json and you should see a 1080p SbS Headset Window
• Close SteamVR
• Edit the Documents\My Games\vrto3d\default_config.json as needed - see what each setting does
  • Set your window resolution to match your fullscreen resolution
  • Set your render resolution per eye to what you want - can save some performance by reducing this. If your display is half-SbS or half-TaB, then you can try setting this to that half-resolution
  • Single Display Mode: make sure the debug_enable flag is set to true to make more games work (not 3DVision compatible)
• Try launching a VR game

Notes

• SteamVR may still complain about Direct Display mode, but this can be safely dismissed
• Exiting SteamVR will "restart" Steam - this is normal
• Overlays generally won't work on this virtual HMD

Troubleshooting

• If you have used other SteamVR drivers that also create a virtual HMD, you will need to disable and/or uninstall them
  • Run SteamVR
  • On the SteamVR Status window, go to Menu -> Settings
  • Change to the Startup / Shutdown tab
  • Click Manage Add-Ons
  • Turn Off any virtual HMD drivers (ALVR, VRidge, OpenTrack, VCR, iVRy, etc)
  • if issues still arise, try a Clean SteamVR Install and delete your Steam\steamapps\common\SteamVR folder
• If you have a VR headset and run into issues with this driver, here's some things to try:
  • Disconnect VR headset from computer
  • Clean SteamVR Install
  • Set SteamVR as OpenXR Runtime

Building

• Clone the code and initialize submodules
• Define STEAM_PATH environment variable with the path to your main Steam folder
• Open Solution in Visual Studio 2022
• Use the solution to build this driver
• Build output is automatically copied to your SteamVR\drivers folder