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)