This is a real-time video tracking program coded on the Processing environment to create a simulation of snowing.
The pixel snowflakes falling down from the top will be stopped by the darker regions on each frame of a live video input. When a user's hand covers the darker region, the trapped snowflakes will continue to fall down. Thus, it creates an effect of the snowflakes being wiped away by the hand.
Flash Plugin Required
Francis Lam, Nov 2003