We have developed a pen device for CAD applications in virtual reality which provides novel features compared
to existing systems. The SenStylus consists of a wireless pen designed to be ergonomically handled by the user
for spatial interaction using a six degree of freedom optical tracking. In addition to the classic digital button(s)
input, it provides analog multi-axial control, and a dual-rumble feedback output. We have integrated the device
into an existing virtual reality CAD environment and extended the application functionalities with new devicespecific
features. The SenStylus vibration feedback improves perception in the virtual world by controlling
frequency, amplitude, and duration of the feedback, simulating a variety of responses during collisions and
selection tasks. This capability enforces the visual depth sensitivity, which is critical when wo rking with
complex CAD models. The multi-axial analog input provides a natural interaction paradigm to the user, thus
simulating pen pressure and angle as in real world sketching and in real clay modeling. Dynamic tool-tip
dimensioning and shaping are implemented as extra features. We present some applications to prove the added
value of the SenStylus. The evaluation of the device received positive feedback by designers and engineers
alike. The new features offered by this device can easily be extended to other VR applications using the API
provided