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Fast shadow casting algorithm in analytical polygon-based computer-generated holography.

Jiaqi Dong, Bo-Ru Yang, Zong Qin

    Optics Express
    |May 9, 2023
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new method for realistic computer graphics using polygon-based computer-generated holography (CGH). This approach enables efficient shadow casting and occlusion handling, improving rendering quality.

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    Area of Science:

    • Computer Graphics
    • Holography
    • Computational Geometry

    Background:

    • Shadow casting enhances realism in computer graphics.
    • Polygon-based computer-generated holography (CGH) has limitations in handling complex occlusions and shadows.
    • Existing triangle-based methods are computationally expensive and difficult to implement for complex scenes.

    Purpose of the Study:

    • To introduce a novel drawing method for polygon-based CGH that incorporates shadow casting.
    • To address the limitations of traditional occlusion handling methods in CGH.
    • To improve the efficiency and realism of holographic rendering.

    Main Methods:

    • Developed a novel analytical polygon-based CGH framework.
    • Implemented Z-buffer-based occlusion handling, replacing the Painter's algorithm.
    • Enabled shadow casting for parallel and point light sources.

    Main Results:

    • Achieved efficient shadow casting within the polygon-based CGH framework.
    • Successfully implemented Z-buffer-based occlusion handling for complex scenes.
    • Demonstrated the framework's generalizability to N-gon rendering.

    Conclusions:

    • The proposed method significantly enhances the reality of rendered images in CGH.
    • The Z-buffer approach offers a more feasible solution for occlusion and shadow casting in CGH.
    • CUDA acceleration can substantially improve rendering speeds for N-gon rendering.