Parametric design and variationaldesign are the key technology in the modern CAD/CAM systems.
参数化、变量化设计已成为现代CAD／CAM系统的核心技术。
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This method keeps the location base of form feature invariance during the feature modeling and editing, and it is suitable for feature parametric variationaldesign and topological variation.
Variationaldesign is the kernel of contemporary CAD technology. There are many solving methods for geometric constraint solving at the aim of variationaldesign, but they all have some limitations.