| http://www.w3.org/ns/prov#value | - The invention also relates to a system for interfacing with a virtual object in a haptic virtual environment, the system including the virtual object having a virtual surface; a virtual tool for use by the user in the haptic virtual environment; a constraint geometry limiting the movement of the virtual tool; a haptic interface device, which senses a location of the user in real space; and a model
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