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Home » Products » Research & Scientific Instruments » Eye Tracking » Motion Capture – Motion recording device

Motion Capture for Tobii Pro Glasses 3 — Gaze and body movement in one 3D measurement

A set of reflective markers that screw onto the Tobii Pro Glasses 3 wearable eye tracker. The cameras of a Qualisys or Vicon motion capture system track the markers and know where the participant's head is and which way it is facing. The glasses add where the eyes are looking — together you get gaze in the space of the entire lab.

Request a quote How it works

2 × 3 markerspassive, spherical, on two lightweight attachments

Qualisys · Viconintegration in QTM and Nexus software

6 degrees of freedomhead position and rotation tracked by cameras

in real timegaze and motion data in one program

A basketball player wearing Tobii Pro Glasses 3 with motion capture marker attachments and Qualisys markers on her body, preparing for a shot

Head: 6 degrees of freedom
markers seen by the cameras

Gaze in 3D
illustration

Eye tracking + motion capture

The glasses know where you look. The cameras — where you are

Eye tracking glasses measure gaze direction relative to the head. A motion capture system is a set of cameras placed around the room that track small reflective spheres — markers — with high precision. The Tobii kit connects both worlds: thanks to the markers on the glasses, the cameras "see" the participant's head, and gaze can be described in the space of the entire lab.

Tobii Pro Glasses 3 with two attachments — each with three spherical reflective markers on short arms

How 3D gaze is created

Three sources of information, one result — in the motion capture software.

The glasses measure where the eyes lookTobii Pro Glasses 3 record the gaze direction of each eye and the scene camera video — as in any study with the glasses.
The cameras track the markers on the glassesThree markers on one attachment form a rigid triangle. From the position of these points, the system calculates where the head is (three directions of translation) and how it is rotated (three rotations) — that is the "six degrees of freedom".
The software combines both measurementsQualisys QTM or Vicon Nexus assigns the gaze direction to the tracked head and draws the gaze ray in the lab space — together with the movement of the hands, torso or a ball.

Why markers

Gaze relative to the head or to the room?

The glasses alone describe gaze from the head's perspective: "to the left and slightly down". When the participant walks and turns, the same "to the left" points to a different place every time. Motion capture adds the head position, so gaze becomes a ray that hits a specific object in the room — in every frame of the recording.

illustration · top view

Glasses + motion capture

The cameras see the markers, so the head position and rotation are known. The gaze ray has its place in the room, and you know what it hits.

Gaze direction relative to the headglasses

Scene camera videoglasses

Head position and rotation in the roommarkers

What the gaze falls on in spaceScreen

Software

Works in the software you already use: Qualisys QTM or Vicon Nexus

The glasses are added to the motion capture system like another measurement device. Gaze data streams over the network to the mocap software, which records it together with the motion, lets you view it live in 3D and then export it — Tobii mentions MATLAB, for example.

A basketball shot study: Tobii glasses with motion capture markers and Qualisys markers on the shoulder, chest and hands — **Glasses + body in one capture.** The markers on the glasses and on the body are tracked by the same Qualisys cameras. Photo: Tobii / Qualisys.

Tobii Pro Glasses 3 in Qualisys Track Manager

You add the glasses in the project settings as an input device. QTM links the gaze direction to the rigid body of the glasses — the marker triangles — and projects the gaze vector into 3D space.

Connection

the QTM computer and the glasses' recording unit on the same network: the glasses' Wi-Fi or a router (cable or Wi-Fi)
several pairs of glasses at once — via a router
ready-made rigid body definitions for the Tobii attachments in QTM

Synchronization

sync cable: 3.5 mm plug to the recording unit's sync port, BNC to the Camera Sync Unit (Arqus, Miqus)
common recording start; the cable is needed only at the start of the measurement
gaze at 50 Hz by default, higher if the glasses support it

Why a cable? Data from the glasses arrives over the network with a delay that can vary. Qualisys recommends hardware synchronization — then the gaze and motion recordings are aligned in time.

Tobii Pro Glasses 3 eye tracking glasses with a cable to the recording unit — **Tobii Pro Glasses 3.** The recording unit connects to the Nexus computer via Ethernet or Wi-Fi.

Tobii Pro Glasses 3 in Vicon Nexus

You add the glasses in the system resources tree as a digital device. The Nexus installer includes templates (VST) for the marker attachments, so you can load the head model with the glasses right away.

What Nexus records

Left / Right Eyeeye position (X, Y, Z) relative to the glasses and pupil diameter
Left / Right Gazegaze direction vector of each eye
Gaze positiongaze point of both eyes

Connection

Ethernet via a DHCP router (recommended) or Wi-Fi
several pairs of Glasses 3 at once — supported, according to Vicon with limited testing

Calibration

started from within Nexus for each participant
calibration card at a distance of 0.5–1.5 m

What about analyzing the eye tracking alone?

You analyze recordings from the glasses in Tobii Pro Lab — heat maps, areas of interest, mapping onto snapshots of the scene. Motion capture data stays in QTM or Nexus; the manufacturer does not state that motion data can be imported into Pro Lab.

Sources: tobii.com (Motion Capture), Qualisys QTM and Vicon Nexus 2.17 documentation, as of 2026-10.

Why Interlab

Eye tracking matched to your motion lab

Most often, the motion capture system is already in the lab, and eye tracking comes as a new layer. We help you align both systems so that your first measurement is a measurement, not a connection test.

A table tennis player wearing Tobii Pro Glasses 3 during a rally — a study of gaze in sports — **Test before you buy**Book a demo of Tobii Pro Glasses 3 — we'll also discuss how to connect the glasses to your Qualisys or Vicon system.

Authorized Tobii partner

Glasses, marker kit and Tobii software from one source — with full knowledge of how to configure the whole setup.

Methodological advice

We help you plan the study: gaze sampling rate, calibration, number of participants at once, export for analysis.

Implementation and training

We set up the glasses on your network, connect them to QTM or Nexus and go through the first measurement with your team.

Grants and tenders

We'll prepare a technical description of the setup and a specification for a grant application or tender procedure.

Local support in Poland

We resolve questions about configuration, synchronization or updates with Tobii on your behalf.

References in Poland

We supply Tobii solutions to Polish universities and research teams — we'll gladly put you in touch with users.

Multimodal lab: gaze, motion and physiology

Tobii Pro Glasses 3 also connect to BIOPAC systems — via the TTL port and Lab Streaming Layer — so alongside gaze and motion you can record, for example, heart activity or skin conductance. Details on the Tobii Pro Glasses 3 page.

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Design

What's in the kit and what else you need

Two attachments of the Tobii Motion Capture kit — each with three gray spherical markers on arms and a threaded mount

Components

2×

Marker attachments

Two lightweight attachments, each with three passive spherical markers. They screw onto the mounts on the Tobii Pro Glasses 3 frame — one on each side.

Qualisys sync cable

A dedicated cable that synchronizes both data streams based on timestamps. Needed only with a Qualisys system.

For the measurement you also need

Tobii Pro Glasses 3 — the kit is an accessory for this model
an optical Qualisys (QTM) or Vicon (Nexus) motion capture system with cameras
for hardware synchronization with Qualisys — a Camera Sync Unit (Arqus, Miqus systems)

Applications

Where it matters how the eyes work with the body

Combining eye tracking with motion capture lets you study the coordination of eye and body movements — a fuller picture of behavior than either measurement alone.

A table tennis player wearing eye tracking glasses during a game

Sports

Hand–eye coordination and visual strategies: from goalkeeping to a golf swing.

A surgical team in an operating room, one of the doctors wearing eye tracking glasses

Medicine and rehabilitation

The coordination of experienced surgeons as training material; assessing progress in motor rehabilitation.

Two pilots in an aircraft cockpit during a flight

Training and simulation

Scenarios under controlled conditions: movement and gaze show how to practice new skills and improve safety.

A study participant wearing eye tracking glasses touches a planet model at an exhibition

Psychology

Which stimuli trigger specific body language and how gestures relate to speech.

From the scientific literature

Motion capture tested how the glasses cope with movement

Close-up of a human eye with a brown iris

Lund University: glasses slipping on the face

During movement, eye tracking glasses can slip slightly on the nose, which degrades the measurement. Researchers from Lund combined eye tracking with motion capture to measure this effect in three models of glasses. Tobii Pro Glasses 3 proved the most robust.

< 2.5°mean gaze error across all tasks

1.45°mean error in the baseline condition

Nyström M., Niehorster D. C., Lund University — “Uncovering the effect of slippage on wearable eye trackers: A motion capture study”, ACM, DOI 10.1145/3797246.3803029. Results cited by Tobii.

Specifications

According to Tobii, Qualisys and Vicon documentation. We list the parameters of the glasses because they determine the gaze measurement.

Tobii Pro Glasses 3 with the motion capture marker kit mounted

Specifications of the Motion Capture kit for Tobii Pro Glasses 3
Parameter	Value
Kit
Manufacturer	Tobii AB (Motion Capture Marker set)
Contents	2 lightweight attachments, each with 3 passive spherical markers
Mounting	screwed onto the mounts on the glasses' frame
Compatible glasses	Tobii Pro Glasses 3
Motion capture systems	Qualisys, Vicon
Synchronization with Qualisys	dedicated sync cable (timestamps)needed only with a Qualisys system
Qualisys Track Manager
Integration	glasses as an input device; gaze vector assigned to the rigid body of the glasses (6DOF); ready-made rigid body definitions for the Tobii attachments
Connection	shared local network: the recording unit's Wi-Fi or a router; no direct cable; several pairs of glasses via a router
Gaze sampling rate	50 Hz by default; higher if the glasses support it
Hardware synchronization	cable: 3.5 mm to the recording unit's sync port, BNC to the Camera Sync Unit output (Arqus, Miqus); for Oqus — a sync/trigger splitter
Vicon Nexus
Integration	glasses as a digital device; VST templates for the attachments in the Nexus installer
Data	eye position (X, Y, Z) and pupil diameter; gaze vector of each eye; gaze point — relative to the glasses
Connection	Ethernet via a DHCP router or Wi-Fi
Multiple pairs of glasses	supported for Glasses 3 (according to Vicon — limited testing)
Tobii Pro Glasses 3
Sampling rate	50 Hz or 100 Hz
Accuracy	0.6°
Weight of the glasses	76.5 g (with cable)
Sync port	3.5 mm socket (TTL signal) on the recording unit

Sources: tobii.com (Motion Capture, Tobii Pro Glasses 3), docs.qualisys.com, help.vicon.com (Nexus 2.17), as of 2026-10. The manufacturer does not list the marker diameter or the kit weight on the product page — we'll provide them in the quote.

Frequently asked questions

Is the kit enough to measure movement?

No — it is an accessory. Movement is measured by the cameras of a Qualisys or Vicon motion capture system, and gaze by Tobii Pro Glasses 3. The marker kit lets the cameras see the glasses, and the mocap software combines both measurements. If you are just planning your lab, we'll advise you how to put it all together.

Does it fit other Tobii glasses?

Tobii offers the kit for Tobii Pro Glasses 3 — the attachments screw onto the mounts on this model's frame. Tobii Glasses X do not have an external TTL sync port; for multimodal studies, the manufacturer intends Glasses 3.

Can I study several people at once?

Yes, with limitations described by the mocap manufacturers. In Qualisys QTM, several pairs of Glasses 3 connect via a router. Vicon Nexus supports several pairs of Glasses 3, but according to Vicon this configuration has undergone limited testing. Each person needs their own glasses and attachments.

Does synchronization work without a cable?

Data travels over the network, so the live view has some delay, which can vary. For analysis, Qualisys recommends hardware synchronization with a cable — it only needs to be connected at the start of the recording. The live delay cannot be compensated; the correction applies to the recorded data.

Where do I analyze the results?

Gaze and motion together — in QTM or Nexus: 3D view, recording and export for further analysis, for example in MATLAB. Recordings from the glasses alone (scene video, heat maps, areas of interest) are analyzed in Tobii Pro Lab. The manufacturer does not state that motion capture data can be imported into Pro Lab.

What does calibration look like?

Before each session, the glasses are calibrated on the participant — in the Glasses 3 app (when working with QTM) or from within Nexus. The participant looks at a calibration card held at a distance of 0.5–1.5 m.

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Motion Capture for Tobii Pro Glasses 3 — Gaze and body movement in one 3D measurement

The glasses know where you look. The cameras — where you are

How 3D gaze is created

Gaze relative to the head or to the room?

Glasses + motion capture

Works in the software you already use: Qualisys QTM or Vicon Nexus

Tobii Pro Glasses 3 in Qualisys Track Manager

Connection

Synchronization

Tobii Pro Glasses 3 in Vicon Nexus

What Nexus records

Connection

Calibration

Eye tracking matched to your motion lab

Authorized Tobii partner

Methodological advice

Implementation and training

Grants and tenders

Local support in Poland

References in Poland

Multimodal lab: gaze, motion and physiology

What's in the kit and what else you need

Components

Where it matters how the eyes work with the body

Sports

Medicine and rehabilitation

Training and simulation

Psychology

Motion capture tested how the glasses cope with movement

Lund University: glasses slipping on the face

Specifications

Frequently asked questions

Ask about this product