Effects of InterActor´s nodding on a collaboration support system

A collaboration support system for 3D shape evaluation in virtual space has been developed on the basis of both studies in 3D shape evaluation and communication support in virtual space. The proposed system provides the two viewpoints. One is the viewpoint of back side of user´s own avatar for the smooth communication. The other is that of avatar´s eye for 3D shape evaluation. Switching viewpoints satisfies the both task conditions for 3D shape evaluation and communication. The system basically consists of PC, HMD and magnetic sensors, and users can share the embodied interaction by observing interaction between their avatars in virtual space. However, the HMD and magnetic sensors, which are put on the users, would restrict the nonverbal communication. Then, we have tried to compensate the loss of nodding of partner´s avatar by introducing the speech-driven embodied interactive actor InterActor. Sensory evaluation by paired comparison of 3D shapes in the collaborative situation in virtual space and in real space and the questionnaire are performed. The result demonstrates the effectiveness of InterActor´s nodding in the collaborative situation.