层次深度拼图集:一种新的树木快速绘制方法  

LDM-Pack: A New Method for Rendering Trees Rapidly

作　　者：张淮声[1] 华炜[1] 王青[1] 鲍虎军[1] 

机构地区：[1]浙江大学CAD&CG国家重点实验室,杭州310027

出　　处：《中国图象图形学报（A辑）》2004年第10期1216-1222,共7页Journal of Image and Graphics

基　　金：国家自然科学基金(60203014);博士点基金(20030335083);创新群体项目(60021201);国家重点项目(60133020);973项目(2002CB312102)

摘　　要：提出了一种层次深度拼图集的树木表示方法,可以快速绘制树木,并有较高真实感效果。首先对树模型进行采样,得到其LDI集,然后使用一种包含遮挡信息的自适应纹理压缩方法,组合成纹理图像包,并创建对应的深度拼图集。这样树被表示成多个采样方向上的层次深度拼图集的组合。在绘制中,使用一种融合策略进行绘制合适的层次深度拼图集,实现了渐进过渡。通过实验,可以使用相对于树的原始面片较少的深度拼图绘制,能够满足交互式应用的需要。This paper presents a new specification of LDM-Pack tree, which renders trees rapidly with high fidelity. It first samples the tree model, and gains its LDI-Packs. All LDI-Pack textures are compressed by an occlusion-inclusive compression approach, and packed into texture packages. Then the corresponding LDM-Packs are created from LDI-Packs according to the predetermined viewpoints. Thus, a tree is specified by a group of LDM-Packs with several sample directions. When rendering stage, one blending scheme is used to render correct LDM-Packs for smooth transitions. Shown by the experiments, the number of rendering depth mosaics is less than the one of the tree original polygons.

关 键 词：快速绘制 拼图 纹理图像 融合策略 树模型 层次 遮挡 深度 组合 方向 

分 类 号：TB9-37[一般工业技术—计量学] TP391[机械工程—测试计量技术及仪器]