Trackballs and Spaceballs

➢ A trackball is a ball device that can be rotated with the fingers or palm of the hand to produce screen cursor movement.

➢ Laptop keyboards are equipped with a trackball to eliminate the extra space required by a mouse.

➢ Spaceball is an extension of two-dimensional trackball concept.

➢ Spaceballs are used for three-dimensional positioning and selection operations in virtualreality systems,modeling,animation,CAD and other applications.