5. Conclusion
In this study, we developed a CAD modeling system for the smart device environment. The major contribution of this study is that we proposed the first-ever system design of a 3D CAD system
available on a smart device with consideration of the characteristics and shortcomings of smart devices. Implementation methods and case studies using a prototype system with examples were also introduced in order to demonstrate the applicability of the proposed system. This system opens up the possibility of 3D modeling on smart devices based on simple multi-touch gesture commands.Moreover, the system supports additional fine modifications of 3D models in the PC environment based on a macro-parametrics approach