层次深度拼图集：一种新的树木快速绘制方法

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。

LDM-Pack: A New Method for Rendering Trees Rapidly

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.