Koutek, MichalPost, Frits H.B. Froehlich and J. Deisinger and H.-J. Bullinger2014-01-272014-01-27200132118367131727-530Xhttps://doi.org/10.2312/EGVE/EGVE01/061-070In this paper we present new tools for user interaction with virtual worlds, to bring more natural behavior into the manipulation of objects in virtual environments. We present some principles of physically realistic behavior of virtual objects and a set of user input techniques suitable for semi-immersive VR devices such as the Responsive Workbench. We introduce springs, spring-forks and spring-probes as new tools for assisting direct manipulation of objects in VEs. In this paper we focus on controlling rotational motions.