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Fast shadow casting algorithm in analytical polygon-based computer-generated holography
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DOI：10.1364/OE.487893.png)
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Abstract
En 中文
Shadow casting is essential in computer graphics, which can significantly enhance the reality of rendered images. However, shadow casting is rarely studied in polygon-based computer-generated holography (CGH) because state-of-art triangle-based occlusion handling methods are too complicated for shadow casting and unfeasible for complex mutual occlusion handling. We proposed a novel drawing method based on the analytical polygon-based CGH framework and achieved Z-buffer-based occlusion handling instead of the traditional Painter's algorithm. We also achieved shadow casting for parallel and point light sources. Our framework can be generalized to N-edge polygon (N-gon) rendering and accelerated using CUDA hardware, by which the rendering speed can be significantly enhanced.
Keywords:
ANGULAR SPECTRUM CONVOLUTION
SPECIAL-PURPOSE COMPUTER
PHASE
DIFFRACTION
REMOVAL
FIELD