NAME

       xmountains - A fractal landscape generator.

SYNOPSIS

       xmountains [ bqgPdEmMrBnZIASTWFGCapcevfRltxsXYH ]

DESCRIPTION

       xmountains  is  a  X11  based  fractal  landscape  generator.  It generates random fractal
       surfaces and displays them in a window.  While the  program  is  running  the  fractal  is
       continuously  extended on the right and the image is scrolled from right to left to expose
       the newly generated area.

       Flags:
       -b
              Use the root window.
       -q
              Reset the root window when the program exits. This option  is  ignored  unless  the
              program is using the root window.
       -g [string]
              Set the geometry of the window.
       -P [filename]
              Write the PID to the specified file.
       -d [string]
              Set the display.
       -E
              Toggle  the  way  that  window  repainting  is done. By default the image pixmap is
              installed as the background pixmap of the window and window  repainting  should  be
              performed  automatically  by  the  X  server. If this does not work on a particular
              system then this flag can be used to enable explicit expose  event  processing.  In
              the default mode root window images will remain in place after the program exits.
       -m
              Display a map of the surface rather than a perspective view.
       -M
              Produce reflections in the water. This may be a little slower.
       -r [20]
              To  reduce the load on the X server the program generates several columns of pixels
              before scrolling the image. This flag sets the number of columns.  A negative value
              reverses  the direction of scrolling. A value of zero makes the program scan across
              the window without scrolling at all.
       -B [80]
              Set the number of shades of each colour that the program allocates.
       -n [245]
              Set a maximum number of colours to use. This is just a different way of setting the
              number of shades of each colour.
       -Z [10]
              Set the number of seconds that the program sleeps after scrolling the screen.
       -I [40.0]
              Set the vertical angle of illumination.
       -A [0.0]
              Set the horizontal angle of illumination.
       -S [0.6]
              Set the vertical stretch of the surface.
       -T [0.5]
              Set the vertical shift of the surface.
       -W [0.5]
              Set the height where the water occurs.
       -F [1]
              Reduce the variation in the foreground height to ensure a good view of the surface.
              This flag sets the  number  of  iterations  for  which  the  foreground  height  is
              constrained to a constant value.
       -G [-1.0]
              Mean altitude for the for foreground.
       -C [0.3]
              Set the contour parameter. The base colour of a point depends on its height and how
              flat the surface is. This parameter  controls  the  relative  importance  of  these
              factors.
       -a [2.5]
              Set the Altitude of the viewpoint.
       -p [4.0]
              Set the distance of the viewpoint from the front of the surface.
       -c [1.0]
              Set the contrast parameter. Values too far from 1.0 will give strange results
       -e [0.3]
              Set the ambient light level. This is a fractional value that sets how bright shaded
              areas will be compared to fully illuminated ground.
       -v [0.6]
              Set the vertical light level. The program also implements a secondary light  source
              shining  from  directly  above  the  surface.  This flag sets how bright this light
              source is relative to the main light source.
       -f [0.65]
              Set the fractal dimension of the surface. This should be in the range 0.5-1.0.
       -R [0]
              Set the seed for the random number generator. A value of 0 causes the  seed  to  be
              set from the clock.
       -l [10]
              Set the width of the surface. Increasing this value by one doubles the width of the
              surface.
       -t [2]
              Set the number of non-fractal iterations. Increasing this value by one doubles  the
              average number of mountains across the width of the surface.
       -x
              Use cross updates (see under -H)
       -s [1]
              Control  the  regeneration  steps used to reduce creasing. There are three possible
              regeneration steps controlled by the first 3 bits of this flag value.   (see  under
              -H)
       -X [0.0]
              regeneration step parameter (see under -H)
       -Y [0.0]
              regeneration step parameter (see under -H)
       -H
              Print  a  short  description  of  the  algorithm  explaining  the  -x  -s -X and -Y
              parameters.

IDENTIFICATION

       Author: S.Booth@ed.ac.uk

                                                                                    XMOUNTAINS(1)