1. An apparatus for controlling a feature on a computer generated image, the apparatus comprising: a handheld device including: an image sensor, said image sensor generating data related to the distance between a first point and a second point, the first point having a predetermined relation to the computer generated image and the second point having a predetermined relation to a handheld enclosure; and a processor coupled to said handheld device to receive said generated data related to the distance between a first point and a second point and programmed to use the distance between the first point and the second point to control the feature on the image.