A research on integrated process of solid-model-less styling design and analysis using advanced mesh modeling operations

这项研究的目的是开发软件，其中可以通过查询手写草图或来自物理模型的采样点数据来检索用于分析的遗留网格模型，其中可以通过对遗留模型进行变形以适应草图或采样点来快速获得用于分析新设计思想的新的网格模型。因此，本研究开发了具有类似于常规实体造型能力的高级网格造型操作和用于分析的网格剖分。研究成果可概括为以下几点。1)开发了一种基于内容的手写草图网格检索功能，可以使用通用傅立叶描述子和局部二值模式来检索投影视图与草图相似的网格模型。2)建立了网格拼接函数，通过对四面体网格进行曲面偏移和边折叠操作，将两个接触的复杂网格模型合并为一个模型。3)开发了网格特征去除功能，该功能可以自动识别网格模型上的孔、槽和凸台等小形状特征，并可以使用我们的LOD控制算法来删除或重新生成这些特征。4)开发了特征识别和网格变形函数，实现了大规模网格上可近似为单一解析曲面的局部曲面区域的自动分割，并利用基于网格重心坐标内插的特殊变形函数，以尺寸驱动的方式对网格几何进行变形。这些研究成果以10篇研究论文和2项专利申请的形式公之于众。

The purpose of this research is to develop software where legacy mesh models for analysis can be retrieved using a query of a hand written sketch or sampled point data from physical model, where a new mesh model for analysis for a new design idea can be obtained quickly by deforming the legacy models so as to fit to the sketch or sampled points. Therefore, in this research, advanced mesh modeling operations which stand geometric modeling ability similar to conventional solid modeling operations and mesh-generation for analysis were developed. The research results can be summarized as follows. 1) A content based mesh retrieval function from hand-written sketch has been developed where mesh models which have similar projected view to the sketch can be retrieved using generic Fourier descriptor and local binary patterns. 2) A mesh-assembly function has been developed where two complex mesh models in contact can be merged into one model using surface offsetting and edge-collapse operations for tetrahedral mesh. 3) A mesh feature removal function has been developed where the small form features on the mesh model such as holes, slots and bosses can be automatically recognized and these features can be removed or regenerated using our LOD control algorithm. 4) Feature recognition and mesh deforming functions have been developed where partial surface regions on the large scale mesh which can be approximated to a singe kind of analytic surface can be automatically segmented, and where geometry of the mesh can be deformed in the dimension driven way using a special deforming function based on the barycentric coordinate interpolation for mesh. These research results were presented in public in the form of 10 research papers and 2 patent applications.