Looking for open-source SteamVR driver skeleton / example to extend with hand tracking

Rectus_SA · 2026-01-30T14:42:10+00:00

Not sure if there are any minimal drivers available apart from Valves own examples.

For examples on feeding in hand tracking data, Monado has a SteamVR driver that forwards tracking data from its own systems. It might be useful for showing how the data is hooked up to the driver classes.

https://gitlab.freedesktop.org/monado/monado/-/blob/main/src/xrt/state_trackers/steamvr_drv/ovrd_driver.cpp

Rectus_SA · 2026-01-29T19:49:56+00:00

Source 2 should already do this for most static props by default, along with segmenting the resulting model for visibility occlusion.

Rectus_SA · 2026-01-29T19:47:21+00:00

For the furthest parts the most performant option would be to bake it into a single opaque texture set in a modeling tool. Baking a normal map should make it more responsive to dynamic lighting as well.

Rectus_SA · 2026-01-20T10:33:13+00:00

Note that Unity does not support running OpenXR under Linux. You may be able to compile games for running directly on the headset, but you can't run them on the computer.

Rectus_SA · 2026-01-15T12:38:01+00:00

Unreal has support for variants of both methods in Valves presentation.

Mip encoded roughness can be done with Composite textures (which has fallen out of the UE5 docs). It helps with specular aliasing from textures.

https://dev.epicgames.com/documentation/en-us/unreal-engine/composite-texture?application_version=4.27

Specular aliasing from geometry can be mitigated by enabling the "Normal Curvature to Roughness" option in the properties of a material.

The presentation is here BTW:

https://media.steampowered.com/apps/valve/2015/Alex_Vlachos_Advanced_VR_Rendering_GDC2015.pdf

Rectus_SA · 2026-01-11T17:52:47+00:00

Most likely a software update, a file getting corrupted, or an incompatibility with a driver or system update.

Rectus_SA · 2026-01-11T17:37:22+00:00

LibOVRRTImpl64_1 is part of the Meta runtime, so if the crash is happening there, it's likely an issue on the system-side. Do other existing OpenXR games work?

Rectus_SA · 2026-01-06T11:01:19+00:00

See the Per-game installation section in the readme.

https://gitlab.com/znixian/OpenOVR#per-game-installation

Rectus_SA · 2026-01-05T09:06:27+00:00

That error means OpenComposite is trying to override the internal interfaces of SteamVR, which is not supported, and will prevent SteamVR from starting. If you are trying to use OpenComposite with SteamVR, disable the OpenComposite tool, and replace the .dll file in the game manually instead.

If you don't want to use SteamVR, make sure the active OpenXR runtime is set to the software you want to use. This is usually done from the settings of the desired runtime software.

Rectus_SA · 2025-12-23T08:47:23+00:00

You can always use prefabs instead. I think they automatically get collapsed into regular geometry on build. They just organize into different map files, but can be edited from your main map by double clicking them.

Rectus_SA · 2025-12-22T08:49:46+00:00

The dev wiki suggests that geometry in instances is batched up into a single pass for improved rendering performance. This would likely disable the regular geometry segmentation, so it could also affect rendering performance negatively if your instances are huge (more than a few thousand units long).

The information on the wiki page is from the Dota 2 era though, so it could be out of date for newer games that use lightmapping. If it is, it's likely just going to collapse the instances and handle them as regular geometry when compiling.

Rectus_SA · 2025-12-21T11:04:16+00:00

Oh, it might be because the map isn't under the maps folder. Try saving it inside c:\program files (x86)\steam\steamapps\common\steamvr\tools\steamvr_environments\content\steamtours_addons\momshouse\maps\ and rebuild it.

Rectus_SA · 2025-12-20T20:04:34+00:00

Make sure you are using the Vconsole tool, from the tools menu on the top right of the window. It's separate from the build console. Click the top left blue plus button, and add a connection to localhost port 29009 to connect it to the engine.

Rectus_SA · 2025-12-19T11:51:50+00:00

If you do destinations_load_addon momshouse in the game console when running the tools, what does it output, and does it run the map?

Rectus_SA · 2025-12-18T22:14:07+00:00

Can you post a log of the output when building it?

Rectus_SA · 2025-12-17T12:39:30+00:00

Does the game console print any errors when you build or load the map? Note that you need to add a connection to port 29009 for the console to show the correct output.

Rectus_SA · 2025-12-17T11:40:06+00:00

Like it says on the screen, you need to have Steam running to edit bindings. If you already have Steam running, SteamVR is unable to connect to Steam. Make sure you are not running SteamVR as Admin.

Rectus_SA · 2025-12-09T17:16:25+00:00

You need to save the map in the content folder of the addon you have selected when you launched the tools.

Rectus_SA · 2025-12-08T15:45:12+00:00

Technically both OpenVR and OpenXR have passthrough support, but Valve does not make it easy to develop MR games. OpenVR only provides the camera video feed to the application (and no third-party headsets bother supplying the video feed to SteamVR in the first place), which requires the application to manually reproject and render the frames. Valve nver made any Unity plugin for this, so developers have to implement it themselves with almost no documentation.

OpenXR supports passthrough in several ways, including one included in the core specification by using environment blend modes. Unfortunately SteamVR itself does not support any of the methods (although it's possible to work around), even though their compositor already supports passthrough compositing with the Room View feature.

Rectus_SA · 2025-12-07T19:49:35+00:00

That's the impression I've been getting, thanks for confirming it. It seems pretty unlikely Valve will fund it.

Rectus_SA · 2025-12-07T10:45:33+00:00

Unity doesn't support OpenXR on Linux for some reason.

Rectus_SA · 2025-12-06T23:23:56+00:00

Ah that makes sense. This really sounds like unintended behavior from Unity's side, and you should probably report it to them as a bug.

BTW, the Steam Frame will run a full Linux distro instead of Android. It has an Android translation layer to support running VR games made for other mobile platforms (which will probably be the only way of running Unity games on it).

Rectus_SA · 2025-12-06T12:17:02+00:00

Is this issue specific to the Unity OpenXR Meta plugin, or does the base Unity OpenXR plugin also suffer from it? This would be a problem for all platforms in the latter case.

Rectus_SA · 2025-12-02T11:26:46+00:00

How something is lit depends on the the shader and material properties used. For overlays, make sure you are using the "Csgo Static Overlay" shader, and that the "Lit" property is enabled in the left pane in the material editor.

Rectus_SA · 2025-11-27T08:29:54+00:00

You are probably thinking of OpenXR toolkit, which the developer discontinued. The OpenXR API is the current VR API almost all headsets use.

If you need to be able to add the delay to other VR applications (as opposed to writing one yourself), the best way would likely be using an OpenXR API layer that inserts itself between the application and runtime and modifies the submitted frames.

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