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Temporal Foveated Fluid Animation in Virtual Reality.

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    This study introduces temporal foveated fluid simulation for virtual reality (VR). It uses gaze-contingent methods to optimize fluid simulation timesteps, enhancing realism and efficiency in VR environments.

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    Area of Science:

    • Computer Graphics
    • Virtual Reality
    • Fluid Dynamics

    Background:

    • Realistic fluid simulation in VR is computationally intensive, limiting immersive experiences.
    • Current foveated approaches mainly use spatial adaptivity, neglecting temporal aspects.

    Purpose of the Study:

    • To develop a gaze-contingent fluid simulation system considering temporal dynamics.
    • To quantify perceptual thresholds for fluid simulation timesteps based on gaze.
    • To enable more complex and larger-scale fluid phenomena in real-time VR.

    Main Methods:

    • A perceptual study was conducted to link gaze eccentricity, fluid density, and timestep perception.
    • A perceptual model was fitted to predict timestep needs for realism.
    • An asynchronous position-based fluids (PBF) algorithm was developed, adapting local timesteps based on visual importance and density deviation.

    Main Results:

    • The proposed method achieves perceptually indistinguishable results compared to high-fidelity simulations.
    • Objective evaluations show improved efficiency and maintained perceptual quality.
    • Runtime experiments demonstrate speed-ups up to 1.52× in various fluid scenarios.

    Conclusions:

    • The temporal foveated fluid simulation extends foveated rendering into the temporal domain for VR.
    • This perceptually grounded framework enhances fluid simulation efficiency and realism in virtual reality.
    • The approach enables more complex and large-scale fluid phenomena in real-time VR applications.