1.1. Problem definition
There are many commercial CAD systems for the PC environment, but even the CAD companies behind the creation of such systems have only managed to develop 3D model viewers or cookbook
applications in smart devices. Regarding the few CAD modeling applications for smart devices such as AutoCAD WS, only 2D modeling
is supported. Why does not an application that supports 3D modeling exist? From a developer’s perspective, there are several reasons
that make it difficult to create CAD modeling programs for smart
devices.