Motion capture (MoCap) is the process of recording the movements of a person or object and translating them into digital data. This data can then be used to create realistic animations in video games, movies, and other digital media.
There are two main types of motion capture: optical and inertial.
Optical motion capture
Optical motion capture uses cameras to track the movements of markers placed on the actor’s body. The markers can be passive or active.
- Passive markers reflect light back to the cameras, where they can be detected.
- Active markers emit light, which is detected by the cameras.
Optical motion capture is the most common type of motion capture, and it is used to create high-quality animations for video games, movies, and other digital media.
Inertial motion capture
Inertial motion capture uses sensors to track the movements of the actor’s body. The sensors are attached to the actor’s body and measure their acceleration, velocity, and orientation.
Inertial motion capture is less expensive than optical motion capture, but it is not as accurate. It is often used for real-time applications, such as video games and virtual reality (VR).
Comparison of motion capture types
| Feature | Optical motion capture | Inertial motion capture |
| Accuracy | High | Lower |
| Cost | High | Lower |
| Setup | Complex | Simple |
| Real-time capability | No | Yes |
Which type of motion capture is right for you?
The best type of motion capture for you will depend on your needs and budget. If you need to create high-quality animations, then optical motion capture is the best option. However, if you need a real-time solution or are on a tight budget, then inertial motion capture may be a better option.
Here are some examples of when each type of motion capture is used:
- Optical motion capture:
- Video games, such as Uncharted and The Last of Us
- Movies, such as Avatar and Lord of the Rings
- TV shows, such as Game of Thrones
- Inertial motion capture:
- Video games, such as VR games
- Real-time applications, such as facial tracking and body tracking for VR headsets
Motion capture is a powerful tool that can be used to create realistic animations for a variety of applications. The best type of motion capture for you will depend on your needs and budget.
