Efficient manipulation of object groups in virtual environments

In this paper, we describe simple techniques for object group manipulation, an important operation in user interaction with a Virtual Environment. All presented manipulation techniques exploit constraints to simplify user interaction. The techniques are based on how humans perceive groups and afford direct manipulation of such groups. Furthermore, we introduce two new intuitive ways to create a whole group of objects: drag-add and random drag-add. Finally, we present an evaluation of the presented techniques.