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

本研究的目的是开发一种软件，在该软件中，通过对物理模型的手绘草图或采样点数据的查询，可以检索用于分析的遗留网格模型，通过对遗留模型进行变形，使其与草图或采样点相适应，可以快速获得用于分析新的设计思想的新的网格模型。因此，本研究开发了具有类似于传统实体建模操作的几何建模能力和网格生成分析能力的高级网格建模操作。研究结果可以总结如下。1)开发了基于内容的手绘草图网格检索功能，其中可以使用通用傅里叶描述符和局部二值模式检索具有与草图相似投影视图的网格模型。2)通过四面体网格的表面偏移和边缘塌陷操作，开发了一种网格装配函数，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小孔、槽和凸台等小形状特征，并使用我们的LOD控制算法去除或再生这些特征。4)开发了特征识别和网格变形功能，可以自动分割大尺度网格上近似为单一解析曲面的局部曲面区域，并使用基于网格质心坐标插值的特殊变形函数以尺寸驱动的方式对网格进行几何变形。这些研究成果以10篇研究论文和2项专利申请的形式向公众展示。

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.