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Download and install the Steam Desktop client and SteamVR.
Start SteamVR , right-click on your head mounted tracker and click Manage Trackers (see image below).
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In the Steam VR settings select Manage Trackers (see below)
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Set the Tracker Role to Camera. Click Close and also close SteamVR Settings.
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Note
By default, this assumes the tracker is front facing; if you have it mounted to the back of your head you will need to adjust the offsets for the tracker in your animation software, so the character’s head faces the correct direction.

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and connect the Vive tracker you want to use for head tracking. Make note of the name and serial number that shows up in the device list (e.g. LHR-4B07E0F2) as you’ll need this later.
Open C:\Program Files (x86)\Steam\config\steamvr.vrsettings in a text editor.
Add "activateMultipleDrivers" : true, "forcedDriver": "null", to near the top of the steamvr section of your steamvr.vrsettings config file and save the file.

Code Block

{
  "steamvr" : {
   "activateMultipleDrivers" : true,
  "forcedDriver": "null",
  "allowAsyncReprojection" : false,
  "allowInterleavedReprojection" : false,
  "allowSupersampleFiltering" : false,
  "enableHomeApp" : false,
  "mirrorViewGeometry" : "1387 675 2272 1270",
  "showMirrorView" : true
 }
}

Open C:\Program Files (x86)\Steam\steamapps\common\SteamVR\drivers\null\resources\settings\default.vrsettings in a text editor.
Secondly Set "enable" : true under driver_null to enable the null driver and save the file.

Code Block

 {
"driver_null" : {
	"enable" : true,
	"serialNumber" : "Null Serial Number", 
	"modelNumber" : "Null Model Number",
	"windowX" : 0,
	"windowY" : 0,
	"windowWidth" : 1920,
	"windowHeight" : 1080,
	"renderWidth" : 1920,
	"renderHeight" : 1060,
	"secondsFromVsyncToPhotons" : 0.01111111,
	"displayFrequency" : 60.0
}
  }

Start SteamVR, right-click on your head mounted tracker and click Manage Trackers (see image below).

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In the Steam VR settings select Manage Trackers (see below)

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Set the Tracker Role to Camera. Click Close and also close SteamVR Settings.

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Note
By default, this assumes the tracker is front facing; if you have it mounted to the back of your head you will need to adjust the offsets for the tracker in your animation software, so the character’s head faces the correct direction.

Open C:\Program Files (x86)\Steam\config\steamvr.vrsettings in a text editor.
Add the new section below to steamvr.vrsettings called TrackingOverrides, replacing vive_trackerLHR-xxxxxxxx with the serial number and name of the Tundra tracker you are using for your head, found in step. This will force the head mounted tracker to be used as the HMD tracking point.
Code Block
"TrackingOverrides" : { "/devices/lighthouse/LHR-xxxxxxxx" : "/user/head" }

Info
When using Vive Trackers instead of Tundra Trackers the device path is `/devices/htc/vive_trackerLHR-xxxxxxxx`.

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Changelog	Version	Publish Date (YYYY/MM/DD)
Update instruction order	v.1.1.0	2024/12/14
Initial version.	v1.0.0	2024/11/04

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