中文摘要：

提出一种大规模模型表示方法——法向插值偏移曲面．将模型表示为一个简单的基曲面以及分布在基曲面上的标量偏移场，它具有结构紧凑并易于处理的特点．提出的几何模型由三角网格表示转化为法向插值偏移曲面表示的转化算法，通过原模型的受限简化获得基曲面，利用基曲面上法向量的可插值特性，在简化过程中建立并维护其与原模型之间的一一映射，并将其作为简化限制条件．实验结果表明，基于法向插值偏移曲面的复合模型表示方法精确而高效．

英文摘要：

We introduce a new type of model representation, the normal interpolation displaced surfaces （NIDS）, which decomposes a geometric model into a simple domain mesh and a scalar-valued displacement field over it. The domain mesh represents the rough shape of the model, while the displacement field describes its details. We also provide a fast algorithm to convert geometric models from triangle mesh representation to NIDS. The domain mesh is obtained by constrained simplification. By taking advantage of the distribution of the normals over the domain mesh, a one-to-one map is maintained during conversion process, which serves also as the constraint condition. This representation is shown to be compact, accurate and easy to process.