基于离散点云直接映射STL文件的建模技术

随着计算机技术的发展，反求工程技术和快速原型技术的结合日趋紧密，纯复制的反求工程已不再适应市场发展的需要，在产品的设计和制造阶段都需要具备创新环节的反求工程技术的支持。提出综合优化的方法：对扫描后获取的离散扫描点进行平面的三角剖分及环域间的三角剖分，生成STL文件格式，并结合环域划分风格的特点，使用最小权和最小内角最大化相融合的方法，实现二维优化：当二维坐标释放到空间后会破坏三角形形状，影响模型的质量，用增加点的方法，得到三维优化后的原产品模型的STL文件格式。在布尔运算的基础上，通过对反求模型的三角网格进行任意叠加和任意截取，产生新产品的STL文件格式；对新产品进行总体形状控制、过渡圆角处理等空间优化工作，最终实现新产品创新，缩短了产品的开发周期，降低了开发成本。

MODELING TECHNOLOGY BASED ON SCATTER CLOUD MAPPED STL FILE DIRECTLY

The pure copying in reverse engineering (RE) has already been adapted to the developing market no longer. The integration of RE and rapid prototyping (RP) is gradually closed daily with the development of the compute technique. The innovation of RE techniques is required during the process of product's designing and manufacturing. The synthetical optimization is put forward: the scatter points got after scanning and cicrcularities are triangulated, and the format of stereo lithography file (STL) is created, the 2D optimization is realized with the method of the least right and the method of the least internal angle becoming maximum based on the specialty of the mesh and combined the peculiarity of the circularity partition. The 3D optimization is fulfilled with points adding according to the specialty of the mesh, and then the deformation of the triangles after mapping onto 3D is avoided. With the Boolean operation, the STL format of new product model is formed by arbitrarily the entity's integration and arbitrarily truncating of entity. The 3D optimization is realized by shape control and other treatments of new product model, therefore, the time and the cost of new product development is reduced.