中文摘要：

通过对各类模型的分析和归纳，提出一种基于Netgen的四面体剖分算法，对不规则三角网（TIN)模型进行封闭性检查、非流形检查、表面法向量检查和相交性检查，实现基于TIN复杂模型的四面体剖分。进行四面体剖分时，不在模型的约束面加点，使原始曲面与四面体形状间高度吻合，确保模型精度，保证共面情况下的边界一致性。某矿地层数据的实例应用结果表明，使用该算法能够使边界一致，得到高质量网格，兼具稳定性和高效性。

英文摘要：

A Netgen-based tetrahedralization algorithm was proposed,which fulfilled the tetrahedralization based on complex TIN models after close,non-manifold and surface normal vector checks of TIN model through analysis of various kinds of mo-dels.No points were added on the constraint surface of TIN models in Netgen-based tetrahedralization,leading to the high con-sistency between the original surface and the tetrahedron shape,and ensuring the accuracy of the model and boundary consistency under coplanarity.A sample application in a mineral?s formation data shows that the Netgen-based tetrahedralization algorithm is stable,efficient and ensures the boundary consistency and high quality of mesh.