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    This study introduces a novel all-frequency lighting algorithm that constructs visibility functions on-the-fly, reducing rendering artifacts without dense 3D object tessellation. The method enables real-time rendering of complex lighting effects, including specular shadows.

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    Area of Science:

    • Computer Graphics
    • Real-time Rendering
    • Illumination Models

    Background:

    • Existing pre-computed radiance transfer (PRT) methods require dense 3D object tessellation for high-frequency effects.
    • Interpolation artifacts arise in PRT when objects are not densely tessellated.
    • Efficiently rendering all-frequency lighting, especially direct illumination, remains a challenge.

    Purpose of the Study:

    • To present an all-frequency lighting algorithm for direct illumination that mitigates rendering artifacts.
    • To enable real-time manipulation of lighting environments, viewpoints, and object shininess.
    • To improve the rendering of specular shadows, which are difficult for existing methods.

    Main Methods:

    • A new visibility representation approximating visibility functions with 3D vectors.
    • On-the-fly construction of visibility functions per pixel.
    • A summed area table-based rendering algorithm for non-axis-aligned polygons.

    Main Results:

    • Significant suppression of rendering artifacts even with sparse 3D object tessellation.
    • Real-time performance for rotating lighting, changing viewpoints, and adjusting shininess.
    • Plausible rendering of all-frequency lighting effects, particularly specular shadows.

    Conclusions:

    • The proposed algorithm effectively renders all-frequency direct illumination in real-time.
    • The novel visibility representation overcomes limitations of dense tessellation in PRT.
    • This approach offers a significant advancement in real-time graphics, especially for specular shadow rendering.