DEMoCap can be used with Meta Quest HMDs to do limited motion capture. With these HMDs only upper body motion capture are usable with the following features present (depending on your Quest model):

• Head tracking
• Hand tracking (controller or hands only)
• Eye tracking
• Face tracking
• Finger tracking

Right now DEMoCap does not yet run on the Quest itself. Instead you have to connect the Quest to your PC where DEMoCap runs. This connection can be either wired or wireless using one of these programs:

• WiVRn: Wired and wireless for Linux.
• SteamLink: Wireless for Windows and Linux.
• ALVR: Wireless for Windows.
• Occulus Link/AirLink: Wired and wireless for Windows.

The most stable out of these is WiVRn. There controller and hands only works good. SteamLink has problems with finger tracking breaking the capture on Linux. Occulus Link/AirLink pretty much can't do finger tracking at all. Hence with controller mode various solutions are working while with finger tracking WiVRn seems to be the most reliable one. You have to try for yourself what works for your setup.

The Quest 3 (3S) supports estimated full body tracking. For this the Quest uses the cameras built into the HMD to estimate the full body pose using AI calculations running on the headset. These poses can be retrieved as skeleton over WiVRn. DEMoCap supports simulating trackers using this full body tracking to make it transparent to your existing setup. This section outlines how to best configure DEMoCap and your characters to get the most out of a Quest FBT setup.

Since the Quest produces a simulated full body the actor proportions are not matching those of the actor as outlined in Create Actor. While you can use your own body proportions the results are most likely off. Hence if you plan to use Quest FBT it is recommended to create a custom actor profile named “Quest FBT” or similar. This you can then use instead of your actor profile when working with Quest FBT.

Since the quest only can use reliably the floor distance of the headset it calculates the body proportions solely from it. In general the floor height of a Quest is your own height minus 8-10cm. Hence you can measure your own height and then fill in the values as follows:

• Shoulder Level: Height - 0.4
• Shoulder Width: (Height - 0.09) * 0.25
• Arm Length: (Height - 0.09) * 0.45
• Leg Length: (Height - 0.09) * 0.6
• Foot Distance: Same as Shoulder Width

For example if you measure your height as 1.8m then you would enter the following values:

• Shoulder Level: 1.4
• Shoulder Width: 0.4275 (or rounded 0.42)
• Arm Length: 0.7695 (or rounded 0.77)
• Leg Length: 1.026 (or rounded 1)
• Foot Distance: Same as Shoulder Width