基于视点细分的层次细节模型及其在虚拟内窥镜中的应用

构造了一个基于视点细分的层次细节模型，并将其应用在虚拟内窥镜中。该算法首先对原始模型层次化简得到基网格，然后通过参数化建立原始网格与基网格之间的映射关系，并采取与视点相关的细分来重采样。在视点原则的实现过程中，我们通过八叉树建立了视点变化的索引，并利用了动态变化的相邻模型间的可重用性。实验表明，该算法效率高、数据结构简单、易于实现，可以满足虚拟内窥镜实时绘制的要求。

View Dependent Subdivision LOD and its Application in Virtual Endoscope

Construct the level of details model with view-dependent subdivision, and apply it to virtual endoscope. First we simplify the mesh in hierarchy to get the base mesh, and then parameterize the mesh to map the original mesh to the base mesh, and use the view-dependent subdivision to resample. In the implementation of the view point principles, we adopt octree to index the change of the view point, and the model can be reused in the dynamic change. The experiments show that our method is efficient and is easy to implemented, and the model can be rendered in real time to meet the requirement of virtual endoscope.