Abstract
The sense of touch is inevitable for understanding the real world. Force sensation plays an important role in the manipulation of virtual objects. A haptic interface is a feedback device that generates skin and muscle sensation, including sense of touch, weight, and rigidity. This chapter discusses various force-feedback devices and their applications. In most cases of haptic interfaces, software of a virtual environment is tightly connected to the control program of force displays. This problem is a hazard for the development of further applications of haptic virtual environments. In 1991, a project was started for the development of a modular software tool for a haptic interface. The system was called VECS at the time. The software tool has been improved to support various force displays and their applications. The latest system is composed of seven modules: the device driver of force display, haptic renderer, model manager, primitive manager, autonomy engine, visual display manager, and communication interface. The system is called LHX, library for haptics. Various types of force displays can be plugged into LHX. This chapter introduces techniques and applications for the development of a database system for haptic environments using LHX.
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