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What is the most accurate way to test for VR tracking?

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If you are developing or testing a VR application, you need to ensure that your tracking system is accurate and robust. Tracking is the process of measuring the position and orientation of the VR headset and controllers in the real world, and translating them to the virtual environment. Tracking errors can cause nausea, discomfort, and poor user experience. In this article, you will learn what is the most accurate way to test for VR tracking, and what factors can affect it.

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Md Nahid Hasan

VR/AR | UX/UI Designer | HCI Researcher
Martien Strik

Critical Care Nurse | Account Executive TactileVR | Medical simulation Specialist | Innovating AI-Enhanced VR Solutions…
Sam Clever

CEO @ NOSTRA GROUP | Sales | Leadership | Metaverse

1 Tracking Systems

Different types of tracking systems for VR exist, each with its own advantages and disadvantages. Outside-in systems, such as Oculus Rift, HTC Vive, and Valve Index, use external sensors or cameras that track the headset and controllers from a fixed position. They offer high accuracy and low latency, but require more setup and calibration, and can suffer from occlusion or interference issues. Inside-out systems, such as Oculus Quest, Windows Mixed Reality, and HP Reverb G2, employ cameras or sensors on the headset itself that track the environment and the controllers. They provide more portability and convenience, but have lower accuracy and higher latency, and can struggle with dynamic or featureless environments. Hybrid systems, like Oculus Rift S and HTC Vive Cosmos, combine outside-in and inside-out tracking in an attempt to balance the benefits and drawbacks of both; however, this may introduce more complexity and inconsistency.

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Md Nahid Hasan

VR/AR | UX/UI Designer | HCI Researcher
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When testing VR tracking, I advise focusing on both technical accuracy and user experience. Conduct quantitative tests for precision and latency and complement them with real world user testing to assess responsiveness. This dual approach ensures a well rounded evaluation of the tracking system's performance.

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George Tasick

Founder & CEO | Purveyor of Joy & Curiosity
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There are two primary VR tracking systems: "outside in" and "inside out." Outside in tracking uses external devices like lasers or infrared cameras to define a play space, offering high accuracy but requiring complex setup due to extra hardware and wiring. Inside out tracking, in contrast, is simpler, using cameras on the head-mounted display (HMD) to track the environment. This method is easier to set up with no external hardware, but can face occlusion issues and play space drift, necessitating occasional resets. Outside in is best where accuracy is key, while inside out is ideal for consumer and office use due to ease of setup.

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Sam Clever

CEO @ NOSTRA GROUP | Sales | Leadership | Metaverse
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Je nachdem wie die Brillen eingesetzt werden. In jedem Fall sind Inside-Out Tracking Systeme ein wichtiger Schritt die Ger?te flexibel einzusetzen zu k?nnen ohne auf externe Sensoren angewiesen zu sein. Nur durch den Einsatz von Inside-Out Tracking L?sungen sind bereits eine Vielzahl von neuen Einsatzgebieten entstanden und werden noch entstehen.

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Martien Strik

Critical Care Nurse | Account Executive TactileVR | Medical simulation Specialist | Innovating AI-Enhanced VR Solutions for Emergency and Tactical Medicine Training
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For this i see a lot of potential in working with markerless motion capture technology; this allows for integrating non-verbal communication elements ; like for example posture (using fullbody tracking); hand gestures (using finger tracking) and facial expressions (using facial tracking) Captury offers high quality markerless motion tracking technology; with a very good price

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2 Tracking Metrics

When testing the accuracy of your tracking system, you must define metrics that quantify the tracking performance. Positional error is the difference between the actual position of the headset or controller and the reported position by the tracking system. It is measured in millimeters or centimeters and can be impacted by noise, drift, or calibration errors. Rotational error, which is measured in degrees or radians, is the difference between the actual orientation of the headset or controller and the reported orientation by the tracking system. It can be affected by jitter, lag, or alignment errors. Latency measures the delay between movement of the headset or controller and corresponding updates in the virtual environment. It is measured in milliseconds or frames and can be affected by processing speed, bandwidth, or synchronization issues.

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Sam Clever

CEO @ NOSTRA GROUP | Sales | Leadership | Metaverse
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Insbesondere UV Einstrahlung führt zu erh?hten Abweichungen und Unterbrechungen. Das Tracking erfolgt bei den meisten Herstellern mittels UV Sensoren. An dieser Stelle wird der Einsatz von LIDAR zu erheblichen Verbesserungen führen.

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3 Tracking Methods

To measure the tracking metrics, you need to use some methods that can compare the tracking system output with a ground truth reference. Common methods include optical, mechanical, and software. Optical methods use high-speed cameras or motion capture systems to capture the movement of the headset or controller with markers or LEDs. While they offer high precision and reliability, they are expensive and require a controlled environment. Mechanical methods use mechanical rigs or devices that move the headset or controller along a predefined path or angle. They are low cost and simple, but are limited in range and flexibility and can introduce mechanical errors. Software tools or algorithms simulate the movement of the headset or controller to compare it with the tracking system output. This offers high speed and versatility, but is dependent on the quality and accuracy of the simulation and can introduce computational errors.

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Martien Strik

Critical Care Nurse | Account Executive TactileVR | Medical simulation Specialist | Innovating AI-Enhanced VR Solutions for Emergency and Tactical Medicine Training
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I believe Captury is a unique solution for markerless motion tracking, in realtime and for post processing. This makes it possible to track multiple participants in real-time, without markers, full-body, finger tracking and even innovative facial tracking is possible; all in a single interface. This accessibility and flexibility could transform the XR simulation, entertainment and science industries and revolutionizing the way motion capture is used.

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4 Tracking Factors

To optimize your tracking system, you need to consider some factors that can influence the tracking performance. The environment of the physical space where the tracking system operates can affect the accuracy, stability, and consistency; sources of occlusion, interference, reflection, or distortion should be avoided. Calibration is the process of adjusting and aligning the tracking system to the environment and the user, which can affect the accuracy, offset, and drift. It's important to follow manufacturer instructions and guidelines, as well as perform regular calibration and verification. Additionally, the user wearing the headset and holding the controllers can affect comfort, usability, and feedback; thus, it's essential to make sure that they fit properly, are securely attached, and have enough battery power.

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5 Tracking Tips

To enhance the tracking quality and user experience of your tracking system, you should test it in different environments, scenarios, and movements to collect data and feedback. Analyze the tracking data to identify sources and patterns of errors, and use multiple tracking methods and metrics to compare and validate the results. Additionally, leverage tracking tools and software to visualize, monitor, and debug your system. Lastly, update the firmware and software regularly to check for new features and improvements.

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Sam Clever

CEO @ NOSTRA GROUP | Sales | Leadership | Metaverse
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To enhance VR tracking quality: Test in Various Conditions: Evaluate in different environments and lighting to identify unique performance issues. Diverse Movement Testing: Cover a range of movements to ensure system adaptability. Data Analysis: Regularly review tracking data for error patterns and improvement areas. Multiple Tracking Methods: Combine optical, mechanical, and software methods for comprehensive evaluation. Software Updates: Keep the system updated for optimal performance. User Feedback: Incorporate user experiences for practical insights. Validation Metrics: Use clear metrics like accuracy and latency for assessment.

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6 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Sam Clever

CEO @ NOSTRA GROUP | Sales | Leadership | Metaverse
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Tracking in virtual reality (VR) is crucial for enhancing full-body awareness and kinesthesia, the sense of body movement and position. Accurate tracking ensures that users' physical movements are precisely mirrored in the virtual environment, creating a seamless and immersive experience. This synchronization is vital for fostering a sense of presence, where users feel genuinely 'in' the virtual world, and their actions feel natural and intuitive.

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Martien Strik

Critical Care Nurse | Account Executive TactileVR | Medical simulation Specialist | Innovating AI-Enhanced VR Solutions for Emergency and Tactical Medicine Training
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(markerless) motion capture technology allows to create unique realtime simulations; that are not possible with other technology. For example to integrate humanlike facial expressions and non-verbal communication cues; due to the possibility of facial-, fullbody- and finger tracking

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What is the most accurate way to test for VR tracking?

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3

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5

6

1 Tracking Systems

2 Tracking Metrics

3 Tracking Methods

4 Tracking Factors

5 Tracking Tips

6 Here’s what else to consider

Virtual Reality

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What is the most accurate way to test for VR tracking?

1

2

3

4

5

6

1 Tracking Systems

2 Tracking Metrics

3 Tracking Methods

4 Tracking Factors

5 Tracking Tips

6 Here’s what else to consider

Virtual Reality

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