提出一个桌面虚拟环境下的笔式三维交互框架，包含交互原语和交互任务构造两个核心组件。
Including two main components for generating interaction primitives and interaction tasks, an architecture for pen-based 3D interaction in desktop virtual environment is proposed.
提出了动态八叉树结构和相应的自相似裂变递归算法，实现了虚拟环境下的可加工工件动态建模。
A dynamic 8-tree structure and a relative self-similar recursion algorithm are presented to model a dynamic workpiece object, which is machinable.
虚拟环境下的机械产品概念设计模型已不再停留在传统的原理符号设计阶段，而应具有直观性和可视性。
The model of machine product conceptual design under virtual environment already is not stay no longer stage of tradition's principle sign. But it should have audio-visual and sight.
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