This page would look a lot spiffier if you downloaded a standards compliant web browser.

Gesture Modelling: Using Video to Capture Freehand Modeling Commands, CAAD Futures 33-46
    CAAD Futures 'CAAD Futures 2001', Bauke de Vries, Jos P. van Leeuwen, Henri H. Achten (eds). July, 2001, Eindhoven, the Netherlands, Kluwer Academic Publishers. pp. 271-284. 2001
    abstract:
    Desktop video combined with gesture recognition can be used to build powerful and easy to use interfaces for three dimensional modelling. We have built a demonstration version of such a system.The paper describes our video capture and gesture recognition scheme and describes its use in some simple examples.