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    This study introduces an efficient real-time subsurface scattering algorithm for translucent materials. The novel photon beam diffusion (PBD) method improves large-distance scattering and illumination details, outperforming existing techniques.

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    Area of Science:

    • Computer Graphics
    • Rendering Techniques
    • Material Simulation

    Background:

    • Real-time subsurface scattering is crucial for rendering translucent materials.
    • Existing screen-space and large-distance methods have limitations in accuracy and efficiency.
    • Bidirectional scattering-surface reflectance distribution function (BSSRDF) models are computationally intensive.

    Purpose of the Study:

    • To develop a novel, efficient real-time subsurface scattering algorithm for improved large-distance scattering.
    • To enhance illumination details and translucency effects in rendered translucent materials.
    • To overcome the limitations of existing screen-space and large-distance scattering methods.

    Main Methods:

    • Extended the photon beam diffusion (PBD) model into light view and screen space.
    • Incorporated refracted beams within the medium for scattering estimation.
    • Utilized adaptive sampling and virtual sources in screen space for efficient PBD contribution estimation.
    • Implemented correction factors to align results with path-tracing references.

    Main Results:

    • Achieved real-time performance with results closest to path-tracing references among existing methods.
    • Demonstrated improved front-face illumination details and backlit translucency effects.
    • Significantly accelerated performance compared to previous large-distance scattering methods.

    Conclusions:

    • The proposed PBD algorithm offers an efficient and accurate solution for real-time subsurface scattering.
    • This method enhances the visual quality of translucent materials in computer graphics.
    • The approach provides a new consideration for photon beam utilization in scattering estimation.