Anti-Aliased Rendering of Water Surface  

作　　者：Xue-YingQin EihachiroNakamae WeiHua YasuoNagai Qun-ShengPeng 

机构地区：[1]StateKeyLabofCAD＆CGZhejiangUniversity,Hangzhou310027,P.R.China [2]SaneiCo.,Hachihonmatsuminami,Higashihiroshima,739-0144,Japan [3]HiroshimaInstituteofTechnology,Miyake,Saeki-ku,Hiroshima,731-5193,Japan

出　　处：《Journal of Computer Science & Technology》2004年第5期626-632,共7页计算机科学技术学报（英文版）

基　　金：国家自然科学基金，教育部重点研究项目，国家重点基础研究发展计划(973计划)

摘　　要：Water surface is one of the most important components of landscape scenes. When rendering spacious water surface such as that of the lakes and reservoirs, aliasing and/or moire artifacts frequently occur in the regions far from the viewpoint. This is because water surface consists of stochastic water waves which are usually modeled by periodic bump mapping. The incident rays on the water surface are actually scattered by the bumped waves, and the reflected rays at each sample point are distributed in a solid angle. To get rid of the artifacts of moire pattern, we estimate this solid angle of reflected rays and trace these rays. An image-based accelerating method is adopted so that the contribution of each reflected ray can be quickly obtained without elaborate intersection calculation. We also demonstrate anti-aliased shadows of sunlight and skylight on the water surface. Both the rendered images and animations show excellent effects on the water surface of a reservoir.Water surface is one of the most important components of landscape scenes. When rendering spacious water surface such as that of the lakes and reservoirs, aliasing and/or moire artifacts frequently occur in the regions far from the viewpoint. This is because water surface consists of stochastic water waves which are usually modeled by periodic bump mapping. The incident rays on the water surface are actually scattered by the bumped waves, and the reflected rays at each sample point are distributed in a solid angle. To get rid of the artifacts of moire pattern, we estimate this solid angle of reflected rays and trace these rays. An image-based accelerating method is adopted so that the contribution of each reflected ray can be quickly obtained without elaborate intersection calculation. We also demonstrate anti-aliased shadows of sunlight and skylight on the water surface. Both the rendered images and animations show excellent effects on the water surface of a reservoir.

关 键 词：ANTI-ALIASING water waves spectral function RENDERING computer graphics (CG) 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]