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+.TH t3d 1 "Version 1.1" "Time 3D"
+.SH NAME
+t3d \- clock using flying balls to display the time
+.SH SYNOPSIS
+t3d [ \f2 options\f1 ]...
+.SH DESCRIPTION
+.PP
+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.
+.PP
+t3d uses mouse and keyboard to let you fly through the balls. Hit
+.B S
+to speed up, 
+.B A
+to slow down,
+.B Z
+to zoom in and
+.B X
+to zoom out.
+Use the
+.B left mouse button
+to rotate to the left and the
+.B right mouse button
+to rotate the view to the right. Use the
+.B middle mouse button
+to change the optical axis and the moving direction.
+.B 0
+(zero) will stop you.
+.B Q
+quits.
+.PP
+.SH OPTIONS
+.TP
+.BI "-move " "factor"
+Modifies the direction move of t3d. The clock looks 30 degrees*
+.I factor
+to the left and to the right periodically.
+.TP
+.BI "-wobble " "factor"
+Modifies the wobbling (sounds nice :-) of t3d by multiplying the
+default deformation of the clock with
+.I factor.
+.TP
+.B -minutes
+Shows one small ball for every minute, instead of one for every 2.5 minutes.
+.TP
+.BI "-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.
+.TP
+.BI "-cycle " "period"
+Sets the moving cycle to
+.I period
+seconds. By default, this value is 10 seconds.
+.TP
+.BI "-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.
+.TP
+.BI "-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.
+.TP
+.B -colcycle
+Draws cyclic the color scale used for the balls in the background instead
+of the normal black.
+.TP
+.BI "-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
+.B -colcycle
+are less intensive colors of the same hue and saturation. All values
+in range of 0 to 1.
+.TP
+.BI "-hsv " "hue saturation value"
+Selects the color in HSV color space.
+.I 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.
+.TP
+.BI "-hsvcycle " "speed"
+Rotates the hue axis every 10 seconds*
+.I speed.
+.TP
+.B -help
+Prints a short usage message.
+.TP 8
+.B \-fps
+Display the current frame rate and CPU load.
+.PP
+.SH AUTHOR
+.PP
+Bernd Paysan
+
+Email: bernd.paysan@gmx.de
+
+Hacked on by jwz@jwz.org for xscreensaver.
+
+.SH ACKNOWLEDGEMENT
+.PP
+Acknowledgement to Georg Acher, who wrote the initial program displaying
+balls.
+
+.SH COPYING
+.PP
+Copy, modify, and distribute T3D either under GPL version 2 or newer, or
+under the standard MIT/X license notice.
+
+.SH DISCLAIMER
+.PP
+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.
+
+.SH KNOWN BUGS
+.PP
+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...