Collaborative 3D CAD system for multiple user design

A new 3D platform is build in the self developed WebCAD system, used for multiple user collaborative design. As an extension of the WebCAD system, the collaborative 3D CAD system proposes a collaborative Boolean operation method. With the method complex physical objects can be easily obtained through Boolean operations of some elemental entities. With the new system, geographically distributed designers can design and edit 3D entities collaboratively on their own browsers. A three-tier architecture and an entity-based access control mechanism to settle confliction in collaborative design process are also employed in the system.