Abstract
This chapter presents the development of a Virtual Sculpting system and addresses the issues of interactive solid modelling with a haptic interface. A virtual reality (VR) approach is used to make the sculpting process more intuitive and interactive, by providing stereo viewing and force feedback capabilities in carving a solid block into a 3D free-form object. The geometric modelling in the system is based on the sweep differential equation method to compute the tool swept volume, and uses the ray-casting method to perform Boolean operations between the tool swept volume and the virtual stock in dexel data. The PHANToM manipulator is used as an input device to provide the position and orientation of the sculpting tool, and also as an output device to provide force feedback during the sculpting process. Multithreading is used to help address the different update rates required in the graphic rendering and haptic rendering.
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