关键词: 虚拟现实, 三维交互技术, 语义, 约束, 隐喻

Abstract: Aiming at the requirement of interaction in complex virtual environments，a hierarchical model of 3D interaction tasks is proposed in view of the implementation of high-level application.Based on this model，semantics constraint in virtual scene，which closely related to the characteristics of special VR applications，is introduced into the design of 3D interaction techniques.As examples，several typical navigation and manipulation techniques supporting high-level interaction tasks are developed.By virtue of scene semantics constraint，multiple interaction techniques and metaphors are integrated effectively and smooth transition among these techniques are realized naturally.

Key words: virtual reality, 3D interaction technique, semantics, constraint, metaphor