Soft Decoupling VR Locomotion via Passive Gravity Return
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Solution Overview
Problem
Conventional omnidirectional locomotion devices for virtual reality systems are complex, expensive, and often impractical for home use due to size and stability issues, failing to provide a natural walking experience and adequate immersion.
Innovation Solution
A system comprising a platform with adjustable struts, a support halo, and a harness with sleds that allows users to move freely while decoupling their direction of movement from their gaze, utilizing sensors like IMUs to translate physical movements into virtual environment inputs, enabling natural gait and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motorized locomotion devices use sensors and motors to counter user movements, then the user can be brought back to the center of the platform, but the device becomes complex, expensive, and prone to latency and feedback errors
Solution Approach 1:
The patent removes the motorized feedback system entirely, extracting the complex control loop from the locomotion device. Instead of using motors to actively counter user movements, the system relies on passive physical constraints and gravity to return the user to the center, eliminating sensors, motors, and feedback processing.
Solution Approach 2:
The user's own body weight and gravity serve the function of returning the user to the center of the platform. The passive ball bearing system allows the user to naturally return to the center through gravity-driven movement, eliminating the need for active motorized control and feedback mechanisms.
2Reliability
If the platform is made large to prevent users from walking off, then user safety is improved, but the device becomes too large for residential rooms and difficult to store
Solution Approach 1:
The patent replaces the motorized active control system with a passive mechanical system using ball bearings and gravity. This substitution allows for a much smaller platform footprint while maintaining user safety through physical constraints and natural gravitational return, making the device suitable for residential spaces.
3Ease of operation
If omnidirectional ball bearing platforms are used to allow free movement, then the user can walk in 360 degrees, but the user experiences instability similar to walking on ice and loses natural gait
Solution Approach 1:
The patent applies different friction characteristics to different parts of the platform. The radial direction (inward toward center) has low friction to allow free omnidirectional movement, while the tangential direction has high friction through the passive ball bearing constraint to provide stability and prevent excessive outward movement, creating a balanced experience.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective, compact, and stable omnidirectional locomotion system that enhances user immersion in virtual environments by allowing natural movement and decoupling of movement direction from gaze, improving the overall VR experience.
Implementation Method 1
sleds moveably coupled to the support halo
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
In a virtual reality environment a user's movements are coupled, meaning the user cannot walk and look in different directions. Discloses are methods and systems for soft decoupling the movements of the user in a virtual reality environment, enabling the user to look and walk in different directions simulating real-world interactions. The soft decoupling is performed by receiving acceleration and orientation data from sensors attached to the user. A heading and a heading delta based on a ratio are calculated. The calculated heading and a velocity are translated into soft decoupling inputs for the virtual reality environment.