I'm very much into creating intuitive interactivity with minimum dependency on a controlled enviroment - so the experience can easily be recreated elsewhere with minimal hardware & setup (which is why I generally prefer optical flow analysis over blob tracking if I can, for vision related projects). So a conversation in the vidvox forums about painting in Quartz Composer using the Wiimote but without using the IR sensor really sparked my interest.

This is a demonstration of the different signal modes I added to the Mac OSX Wiimote midi driver - WiiToMidi.

None of the demonstrated signals use the IR sensor so the user has complete freedom of movement (can swing in 360s), stand pretty faraway from any received, computer etc. - and the Nunchuk also has the same position, velocity, orientation etc.

WiiToMidi (wii2midi) is an open-source Mac OSX driver to convert Wiimote and Nunchuk (Niintendo Wii motion based controllers) data to midi. Its a Cocoa application based on the DarwiinRemote WiiRemote framework. Mike Verdone wrote the main app transmitting the values and button presses as midi. I added the modules to calculate and transmit an additional 16 midi cc messages. These are for calculating/transmitting the velocity, position offset and orientation for both the wiimote and nunchuk.