An enhanced classification scheme is described, capable to provide accurate analysis of 3D interaction techniques. It is based on examples found in the literature and summarized here in a review. The feature space of the scheme has proven to be useful in analysing particular subjects of their behavior and in deriving new interaction techniques. Several interaction techniques for the rotation task are analyzed using Fitts' law to predict their performance. The treatment specializes on 2D input devices, but several results are easily generalizable to higher dimensional input devices. *Freie Universitat Berlin, Graduiertenkolleg "Algorithmische Diskrete Mathematik", Takustr. 9, 14195 Berlin, E-mail: [email protected]. Supported by the Deutsche Forschungsgemeinschaft under grant We 1265/2-1. 2 1 Introduction We need two definitions to clarify terminology for the rest of the text: Definition 1 (interaction task): An interaction task is what a user wants to do (e.g. translating, r..
