基于切割环分解的三维建筑物细节层次模型构造

Generating Levels of Detail of 3D Building Models Based on Cutting Loops Decomposition

提出一种基于切割环分解的建筑物LOD(细节层次)模型的自动生成方法,该方法首先通过二面角操作算子识别建筑模型中的切割环,然后通过切割环将建筑物模型迭代分割成建筑主体和一系列细部特征,并将分割的结果存储在一棵构造实体几何树(CSG tree)中,最后对特征部件按重要性进行等级划分,同时进行简化处理。试验结果表明该方法具有较高的计算效率,能有效减少模型表面的细节和较好保持模型的结构特征。

Acutting loop decomposition approach for generating LODof3D building models was proposed. Firstly, the cutting loops of 3D building model were detected according to a dihedral angle operator. Secondly, the building model was decomposed into the main body and a series of feature parts through the cutting loops, which were stored as nodes in aCSGtree. Finally, the nodes in theCSG tree were selectively simplified according to the significance of each node. The experimental results show that the proposed approach is efficient and able to preserve the structural features of the building models.