关键词: CT扫描, 材料反求, 材料空间, 非均质产品, 体参数化

Abstract: Heterogeneous products have been used in many fields. Using reverse-material- oriented methods to build heterogeneous product models can support the design of heterogeneous products with actual material distribution. This paper uses CT scan data as original data, from which point cloud data can be extracted, to achieve a construction of geometry and material space for heterogeneous products. Use volume parameterization methods to acquire geometric space of model. Use parameterization of gray-scale values to acquire materials space of model. By solving a quadratic optimization problem to embed material space into geometric space and achieve the coupling of geometry and material through. Volumetric parametric heterogeneous model is constructed. Take the femur model from human body as example, the algorithms of constructing the volume parameterization heterogeneous model are realized. The result shows that the method of volume parametric modeling for heterogeneous products based on reverse-material-oriented is more convenient and precise to represent the actual distribution information for heterogeneous products and can provide the models for performance analysis and rendering based on volume parameterization model.

Key words: CT scan, heterogeneous product, material reversing, material space, volume parameterization