Accurate, Markerless Bat + Body Tracking for Real Baseball Environments

Full-swing analysis using only high-speed video. No sensors, no markers. Built for MLB, collegiate, and elite development programs.

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Validated and Used by Leading Institutions

Zero athlete setup time
Tested on 300+ athletes / 2,000+ swings
Roster-scale throughput
<2° bat-plane accuracy (independent testing)

Swing Analysis Shouldn’t Be Limited to the Lab

Traditional bat sensors and lab-based mocap systems miss the full picture. Theia captures bat + body together in the environments where hitters actually train.

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Lab systems slow training down.

Legacy motion capture systems require complex calibration, instrumentation, and controlled environments. Theia’s markerless system delivers high-fidelity bat and body data from standard video, with minimal setup.

Sensors only capture part of the swing.

Bat-only tools can’t explain why a swing produced a given outcome. Theia measures both the bat path and the underlying biomechanics, letting coaches connect movement to performance.

Single-athlete workflows don’t scale.

Many systems track one hitter at a time. Theia supports roster-scale sessions in cages, bullpens, and on-field work, without interrupting training flow.

From Cameras to Clean Data — in Minutes, Not Hours

Theia3D streamlines motion capture from setup to insight with a three-step, markerless workflow. Each stage is engineered for repeatability, accuracy, and researcher control—no cloud dependencies, no complex calibration, and no specialized suits required.

Step 1 – Calibrate

Quick setup with precise camera alignment. Define your capture volume in minutes using printed calibration boards. No reflective markers or motion trials—just consistent, reproducible calibration across any lab or field environment.

Step 2 – Record

Use any synchronized camera array to record natural motion indoors, outdoors, or in clinics. Theia3D automatically tracks 124 anatomical keypoints with sub-centimeter accuracy and maintains fidelity across varied lighting and terrain.

Step 3 – Analyze

Generate validated 3D kinematics instantly. Process videos locally to reconstruct skeletal models and joint kinematics with < 1 cm spatial error. Export open formats (.c3d, .csv) for immediate integration into biomechanics or performance pipelines—no black-box cloud processing.

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Trusted by Coaches, Analysts, and Performance Teams

Leading labs and performance centers use Theia3D to capture motion in real environments, expand research possibilities, and collect data with unmatched accuracy.

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"

Theia3D delivers research-grade, markerless motion capture to any environment — from labs and clinics to sports fields and product-testing settings. One system with endless applications for capturing real human movement.

"

Arnel Aguinaldo

Professor | Director

PLNU X Padres Biomechanics Lab

"

Theia gives us the full picture – the swing and the body working together in real training environments.

"

Joe Marsh

Principal Engineer

Driveline Baseball Enterprises

Bridging Research and Real-World Performance

Theia3D delivers research-grade, markerless motion capture to any environment — from labs and clinics to sports fields and product-testing settings. One system with endless applications for capturing real human movement.

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Scientifically Validated Motion Capture Performance

Theia’s markerless tracking platform is backed by 50+ peer-reviewed studies and validated across a wide range of sports and motion protocols. The bat-tracking expansion builds on the same modules used by elite biomechanics labs and performance institutes worldwide.

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What is the Best Camera for Markerless Motion Capture?

April 21, 2022
Some thoughts on how to choose the best camera for your markerless motion capture projects.

Integrating External Devices With Theia3D Kinematics

April 12, 2024
In this blog post, we discuss how to integrate synchronized signals from peripheral devices with your Theia3D kinematics.

Data Management Best Practices

November 29, 2023
All data is stored and analyzed locally - the user is responsible for the entire data life cycle. Using the C drive (or “boot drive”) for short term storage, an SSD or network drive for medium term storage, and a mass storage device for archiving will ensure that the data is properly managed for analysis and re-analysis, allow the IT protocols and security requirements for sensitive data of the site to be followed, and limit the likelihood of data loss.

Frequently
Asked Questions

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How accurate is Theia’s bat tracking?

The system measures bat motion within 4–6 mm and joint angles within 2–3 degrees in internal benchmark tests, consistent with Theia’s peer-reviewed motion capture performance.

Does this work in cages, bullpens, or on-field environments?

Yes. Theia is designed for real-world environments — indoor cages, outdoor turf, bullpens, and on-field training.

What equipment do I need?

Any high-speed video setup (e.g., 120–240 fps cameras) and Theia3D with the bat tracking add-on.

How long does setup take?

Typical setup takes under 10 minutes using Theia’s included calibration board.

Can it track multiple hitters in a session?

Yes. Theia supports roster-scale throughput without re-instrumentation.

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Unlock Complete Swing Intelligence

Measure the bat. Measure the body. See the full picture in the environments where hitters actually train.