Virtual Hand Grip Transition Using Intermediate Pre-Grasp States
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Solution Overview
Problem
Existing virtual reality systems face issues with latency and abrupt transitions when controlling a virtual hand to grip an object, which detract from user immersion and ergonomics.
Innovation Solution
A method is introduced to generate a graphical representation of a virtual hand that transitions smoothly from an initial state to a gripping state by determining an intermediate state based on the hand's position relative to the object, using parameters that interpolate between initial and gripping states, allowing the hand to prepare for gripping before a user instruction is given.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transition from idle state to gripping state is gradual and starts at the moment of sending the gripping instruction, then the transition is smooth and realistic, but it causes latency in the implementation of the gripping action
Solution Approach 1:
The system performs preliminary action by automatically transitioning the virtual hand to an intermediate gripping state before the user sends the gripping instruction. When the hand approaches the object within a threshold distance, the system proactively changes the hand state from idle to intermediate gripping state, so that when the user does send the gripping instruction, the hand is already prepared and can execute the gripping action immediately without latency.
2Loss of time
If the transition from idle state to gripping state is instantaneous, then there is no latency, but it greatly deteriorates the immersion for the user
Solution Approach 1:
The system segments the gripping transition into multiple discrete states: idle state, intermediate gripping state, and full gripping state. By dividing the transition into segments rather than executing it as a single instantaneous jump, the system achieves both responsiveness and realism. The hand progresses through intermediate states that are visually detectable but subtle, maintaining user immersion while ensuring rapid response to gripping commands.
3Ease of operation
If the virtual hand transitions automatically to gripping state when approaching the object, then the transition is fluid and anticipatory, but the system complexity increases
Solution Approach 1:
The system introduces an intermediary mechanism in the form of a state determination module that mediates between the hand's physical position and the graphical representation state. This intermediary automatically determines when to transition between states based on simple distance thresholds and hand position data, avoiding the need for complex AI or sophisticated sensors while achieving fluid, anticipatory transitions.
Data Source
AI summary
A method for generating a graphical representation of a virtual hand is implemented as a function of a first set of parameters representing a first state and a first position of a virtual hand in a virtual environment, and as a function of a second set of parameters representing a geometry and a position of an object intended to be gripped by the hand. The method includes a determination of a fourth set of parameters representing a third state intermediate between the first state and a second state, and a third position between the first position and the second position. The hand grips the object in the first state or the second state. The third state allows generation of a graphical representation of the virtual hand from the first state at the first position to the second state at the second position, passing through the third state at the third position.