Integrationsaspekte der Simulation: Technik, Organisation und Personal Gert Zülch & Patricia Stock (Hrsg.) Karlsruhe, KIT Scientific Publishing 2010 Manipulating Virtual Hair and Textiles Manipulation von virtuellen Haaren und Textilien Nadia Magnenat-Thalmann, Ugo Bonanni MIRALab, University of Geneva (Switzerland) Guido Böttcher, Franz-Erich Wolter Leibniz Universität Hannover (Germany) Abstract: The actions of modelling and manipulating virtual objects in three-dimen- sional environments are required for a number of applications in the virtual prototyping process for industrial production as well as in the movie and entertain- ment business. The research and development of interactive systems enabling such operations focus on reproducing the visual appearance, dynamic behaviour and contact response of the simulated objects. This paper presents two application examples of interactive manipulation frameworks which have been respectively designed for the interaction with virtual hair and virtual textiles. 1 Introduction The 3D representation of animated objects is largely exploited in many industries since over two decades. The touch-based interaction with such objects for modelling purposes, on the other hand, is an increasingly active research area with huge appli- cation potential. However, simulating the contact interactions enabling to model complex deformable objects in virtual reality environments and reproducing the associated haptic sensations are challenging tasks. Their computationally intensive character requires defining an appropriate trade-off between the allowed simulation accuracy and the requested performance. Time-critical tasks must be individually computed at the desired speed and efficiently synchronized in order to enable a physically plausible interaction experience. Hence, applications enabling haptics- based manipulation require a tailored and computationally efficient design. In this paper we discuss two such systems for the interaction with hair and textiles. 2 State of the Art While the computation of interaction forces arising during rigid object contact has been extensively discussed over the past decade and is now well understood, there