Temporal Foveated Fluid Animation in Virtual Reality

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.