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Visual Quality Adjustment for Volume Rendering in a Head-Tracked Virtual Environment.

Claudia Hänel, Benjamin Weyers, Bernd Hentschel

    IEEE Transactions on Visualization and Computer Graphics
    |January 19, 2016
    PubMed
    Summary

    Participants preferred continuous visual quality adjustment in immersive virtual environments (IVEs), balancing frame rates and visual fidelity. This approach improved task performance and reduced simulator sickness during head movements.

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    Area of Science:

    • Computer Graphics
    • Human-Computer Interaction
    • Virtual Reality

    Background:

    • High frame rates and low latency are crucial for immersive virtual environments (IVEs) to prevent simulator sickness and enhance user presence.
    • Volume rendering applications often prioritize visual quality, leading to high computational loads and low frame rates, creating a trade-off in IVEs.

    Purpose of the Study:

    • To evaluate the trade-off between visual quality and performance in immersive virtual environments (IVEs) using volume rendering.
    • To determine user preferences for different volume rendering adjustment strategies in response to head tracking.

    Main Methods:

    • A controlled user study with 53 participants was conducted in a CAVE system.
    • Participants performed search and count tasks under varying volume rendering conditions, including instantaneous adjustment, continuous adjustment, and no adjustment.

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  • Head tracking data informed the application of rendering conditions based on viewer position updates.

    • Main Results:

    • Participants significantly preferred the rendering condition with continuous adjustment of visual quality.
    • The continuous adjustment condition resulted in the best task performance and reduced user disturbance during movements.
    • Continuous adjustment was favored over instantaneous adjustment (prioritizing low latency) and no adjustment (prioritizing high visual quality).

    Conclusions:

    • Continuous adjustment of visual quality in volume rendering offers an effective strategy for balancing performance and visual fidelity in IVEs.
    • This adaptive approach enhances user experience, task performance, and presence by minimizing simulator sickness.
    • Findings support further research into optimizing volume rendering acceleration based on user preferences in virtual reality applications.