glutSpaceballMotionFunc  - sets the Spaceball motion call-
       back for the current window.

SYNTAX

       void glutSpaceballMotionFunc(void (*func)(int x, int y, int z));

ARGUMENTS

       func      The new entry callback function.

DESCRIPTION

       glutSpaceballMotionFunc sets the Spaceball motion callback
       for  the current window. The Spaceball motion callback for
       a window is called when the  window  has  Spaceball  input
       focus  (normally, when the mouse is in the window) and the
       user generates Spaceball translations.  The x,  y,  and  z
       callback parameters indicate the translations along the X,
       Y, and Z axes. The callback parameters are  normalized  to
       be within the range of -1000 to 1000 inclusive.

       Registering  a  Spaceball motion callback when a Spaceball
       device is not available has no effect and is not an error.
       In this case, no Spaceball motion callbacks will be gener-
       ated.

       Passing NULL to glutSpaceballMotionFunc disables the  gen-
       eration  of  Spaceball motion callbacks. When a new window
       is created, no Spaceball motion callback is initially reg-
       istered.

SEE ALSO

       glutSpaceballRotateFunc, glutSpaceballButtonFunc, glutMotionFunc,
       glutTabletMotionFunc, glutJoystickFunc, glutDeviceGet

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)