Every mechanical product is assembly of parts according to the parts 'technique requirement. 任何机械产品都是由零件按一定技术要求装配而成的。
Because of the particularity of mechanical manufacturing, virtual assembly call for higher demand to human-computer interaction, direct manipulation has become a bottleneck technique. 虚拟环境的关键特性之一是交互性,机械制造领域的特点决定了虚拟装配对人机交互有更高的要求,直接操作技术已经成为一个瓶颈技术。