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wtf is momentum?

facebookresearch/momentum — explained in plain English

Analysis updated 2026-07-17 · repo last pushed 2026-06-26

★ 384C++Audience · researcherComplexity · 4/5ActiveSetup · moderate

TL;DR

A toolkit for tracking and optimizing human body poses in 3D, giving developers the math and solvers to build fitness, VR, or animation apps that understand human movement.

Mindmap

mindmap
  root((repo))
    What it does
      Tracks 3D joint positions
      Optimizes poses
      Solves kinematics
    Tech stack
      C++
      Python
      Cross-platform
    Use cases
      Fitness form tracking
      VR body capture
      Animation tools
    Audience
      Researchers
      Developers

Code map

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Why would anyone build with this?

REASON 1

Build a fitness app that detects exercise form from video using pose optimization solvers.

REASON 2

Add body tracking to a VR system that captures a user's position from a camera.

REASON 3

Feed messy sensor or video data into Momentum's solvers to find the most likely 3D pose.

REASON 4

Prototype motion analysis research in Python, then move to C++ for performance.

What's in the stack?

C++PythonCondaPyPI

How it stacks up

facebookresearch/momentumd7ead/mkpivmmcjavarp/manager2026
Stars384390391
LanguageC++C++C++
Last pushed2026-06-26——
MaintenanceActive——
Setup difficultymoderatehardeasy
Complexity4/55/51/5
Audienceresearcherresearchergeneral

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · moderate Time to first run · 30min

Conda and Pixi installs are the most stable, PyPI wheels are also available.

Yoink these prompts

Prompt 1
Help me install Momentum via Conda and run a basic pose-tracking example in Python.
Prompt 2
Show me how to use Momentum's solvers to fit a 3D pose to noisy video frame data.
Prompt 3
Explain how Momentum models human kinematics between bones and joints.
Prompt 4
Walk me through switching from Momentum's Python API to its C++ API for better performance.
Prompt 5
How would I use Momentum to build a VR body-tracking feature from camera input?

Frequently asked questions

wtf is momentum?

A toolkit for tracking and optimizing human body poses in 3D, giving developers the math and solvers to build fitness, VR, or animation apps that understand human movement.

What language is momentum written in?

Mainly C++. The stack also includes C++, Python, Conda.

Is momentum actively maintained?

Active — commit in last 30 days (last push 2026-06-26).

How hard is momentum to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is momentum for?

Mainly researcher.

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