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NAME
     t3d - clock using flying balls to display the time

SYNOPSIS
     t3d [  options ]...

DESCRIPTION
     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
     quits.

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

     -wobble factor
          Modifies the wobbling (sounds nice :-) of t3d by multi-
          plying  the  default deformation of the clock with fac-
          tor.

     -minutes
          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 image.

     -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.

     -colcycle
          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.


AUTHOR
     Bernd Paysan

     Email: [email protected]

     Hacked on by [email protected] for xscreensaver.


ACKNOWLEDGEMENT
     Acknowledgement to Georg Acher, who wrote the  initial  pro-
     gram displaying balls.


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


DISCLAIMER
     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 intented  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.


KNOWN BUGS
     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...

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