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       t3d - clock using flying balls to display the time


       t3d [  options ]...


       Time  3D  is  a  clock.  It uses flying balls to display the time. This
       balls move and wobble around to give you the  impression  your  graphic
       workstation with its many XStones is doing something.

       t3d  uses mouse and keyboard to let you fly through the balls. Hit S to
       speed up, A to slow down, Z to zoom in and X to zoom out.  Use the left
       mouse button to rotate to the left and the right mouse button to rotate
       the view to the right. Use  the  middle  mouse  button  to  change  the
       optical  axis  and  the  moving  direction.  0 (zero) will stop you.  Q


       -move factor
              Modifies the direction move of t3d. The clock looks 30  degrees*
              factor to the left and to the right periodically.

       -wobble factor
              Modifies the wobbling (sounds nice :-) of t3d by multiplying the
              default deformation of the clock with factor.

              Shows one small ball for every minute, instead of one for  every
              2.5 minutes.

       -mag factor
              Changes  the  magnification  of  t3d.  By  default,  t3d draws a
              200x200 image.  A .I factor of 2 means, it will  use  a  400x400

       -cycle period
              Sets  the moving cycle to period seconds. By default, this value
              is 10 seconds.

       -wait microsec
              Inserts a wait after drawing one view of the clock. By  default,
              t3d  waits  40 ms after each drawing. This helps you to keep the
              performance loss small.

       -fast precalc_radius
              t3d uses bitmap  copy  to  draw  precalculated  balls.  You  can
              specify the radius in pixels up to which t3d should precalculate
              balls.  t3d  will  set  a  useful  range  by  itself  using  the
              magnification when it is started.

              Draws  cyclic  the  color  scale  used  for  the  balls  in  the
              background instead of the normal black.

       -rgb red green blue
              Selects the color in RGB color space of the  lightning  spot  on
              the balls.  All the other colors used for balls or -colcycle are
              less intensive colors of the same hue and saturation. All values
              in range of 0 to 1.

       -hsv hue saturation value
              Selects  the color in HSV color space.  hue is in degrees from 0
              to 360, all other values in range from 0 to 1. It gives nice but
              rather unpredictable results, if you use a saturation of e.g. 2.
              Try it at your own risk.

       -hsvcycle speed
              Rotates the hue axis every 10 seconds* speed.

       -help  Prints a short usage message.


       Bernd Paysan


       Hacked on by for xscreensaver.


       Acknowledgement  to  Georg  Acher,  who  wrote  the   initial   program
       displaying balls.


       Copy,  modify,  and distribute T3D either under GPL version 2 or newer,
       or under the standard MIT/X license notice.


       T3D is not  related  to  T3D(tm),  the  massive  parallel  Alpha--based
       supercomputer  from  Cray  Research.  T3D’s  name was invented in 1991,
       years before the project at Cray Research started. There is no relation
       from  T3D to Cray’s T3D, even the balls surrounding T3D on some posters
       weren’t an inspiration for T3D. I don’t know anything about  the  other
       way round.

       The  programming  style of T3D isn’t intended as example of good style,
       but as example of how a fast prototyped demo may look like. T3D  wasn’t
       created to be useful, it was created to be nice.


       There  are  no  known  bugs  in  T3D. Maybe there are bugs in X. Slight
       changes in the T3D sources are known to show these bugs,  e.g.  if  you
       remove the (int) casting at the XFillArc x,y,w,h-coordinates...