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The Research of Real-Time Shadow Rendering Algorithm of Virtual Scenes

Liu Hui, Jin Hanjun, Yan Jianlin
Sch. of Electr. & Electron. Eng., Hubei Univ. of Technol., Wuhan
Education Technology and Training, 2008, 2008 International Workshop on Geoscience and Remote Sensing. ETT and GRS 2008

@inproceedings{hui2008research,

   title={The Research of Real-Time Shadow Rendering Algorithm of Virtual Scenes},

   author={Hui, L. and Hanjun, J. and Jianlin, Y.},

   booktitle={Education Technology and Training, 2008. and 2008 International Workshop on Geoscience and Remote Sensing. ETT and GRS 2008. International Workshop on},

   volume={1},

   pages={159–162},

   organization={IEEE},

   year={2008}

}

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Shadow scenes by shadow mapping has long suffered from the problem of under-sampling artifacts due to too little shadow map resolution leading to so-called perspective and projection aliasing. On this issue, we present a new practical real-time shadow mapping algorithm. Firstly we sample the scene from the eye-point on the GPU to get the needed shadow map resolution in different parts of the scene. Then we process the resulting data on the CPU and construct a hierarchical grid structure. Finally we traverse it in quad-tree fashion, shadowing the scene with shadow map pages where needed. The results show that shadow mapping algorithm based on quad-tree is capable of shadowing large scenes by virtually increasing the resolution of the whole shadow map beyond the GPU hardware limit.
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