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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  opti‐
        cal axis and the moving direction.  0 (zero) will stop you.  Q quits.


        -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.
        -delay 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 spec‐
               ify the radius in pixels up to  which  t3d  should  precalculate
               balls.  t3d will set a useful range by itself using the magnifi‐
               cation when it is started.
               Draws cyclic the color scale used for the  balls  in  the  back‐
               ground 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.
        -fps    Display the current frame rate and CPU load.


        Bernd Paysan
        Hacked on by for xscreensaver.


        Acknowledgement  to Georg Acher, who wrote the initial program display‐
        ing 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 super‐
        computer 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...