| 基于Harr 小波的动态场景全频阴影绘制算法 |
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| 引用本文： | 赵沁平,车英慧.基于Harr 小波的动态场景全频阴影绘制算法[J].软件学报,2011,22(8):1948-1959. |
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| 作者姓名： | 赵沁平 车英慧 |
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| 作者单位： | 北京航空航天大学计算机学院虚拟现实技术与系统国家重点实验室,北京,100191 |
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| 基金项目： | 国家自然科学基金(60873159); 国家高技术研究发展计划(863)(2006AA01Z333) |
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| 摘 要： | 针对现有的预计算辐射传递算法对三维场景限制严格、适合于低频光照环境等问题,提出了一种动态场景的全频阴影绘制算法.在预处理阶段使用球体对三维物体进行拟合,同时对光照函数和BRDF(bidirectional reflectance distribution function)函数进行Harr小波变换;在运行时阶段利用不同基函数的优势,在像素基空间进行多个球体可见性函数的快速合并,在小波基空间进行光照函数、BRDF函数和可见性函数的三乘积分,得到最终的光照值.使用CUDA(computed unified device architecture)实现了该算法,充分利用了图形硬件的最新功能.实验结果表明,阴影绘制质量有很大的提高,可以基本达到实时绘制.
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| 关 键 词： | 预计算辐射传递 Harr小波 三乘积分 CUDA(computed unified device architecture) |
| 收稿时间： | 4/1/2008 12:00:00 AM |
| 修稿时间： | 8/7/2008 12:00:00 AM |
All-Frequency Shadows Rendering Algorithm for Dynamic Scenes Based on Harr Wavelets |
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| ZHAO Qin-Ping and CHE Ying-Hui.All-Frequency Shadows Rendering Algorithm for Dynamic Scenes Based on Harr Wavelets[J].Journal of Software,2011,22(8):1948-1959. |
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| Authors: | ZHAO Qin-Ping and CHE Ying-Hui |
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| Affiliation: | ZHAO Qin-Ping,CHE Ying-Hui(State Key Laboratory of Virtual Reality Technology and Systems,School of Computer Science,BeiHang University,Beijing 100191,China) |
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| Abstract: | Current PRT(pre-computed radiance transfer) techniques are limited to having 3D static scene,or large low-frequency lights.In this paper,an all-frequency shadow rendering method for dynamic scenes is proposed.In the preprocessing phase,the blocking geometry is modeled as a set of spheres,according to complex 3D model.The lighting and BRDF(bidirectional reflectance distribution function) are projected onto the Harr wavelet basis.At runtime,with the advantage of different basis functions,the product of visibi... |
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| Keywords: | pre-computed radiance transfer Harr wavelet triple product integral CUDA(computed unified device architecture) |
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