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XMOUNTAINS(1)		     General Commands Manual		   XMOUNTAINS(1)

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 run-
     ning 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  win-
	    dow 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
	    Disable reflections in the water.
     -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 rel-
	    ative 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 sec-
	    ondary 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)
     -window-id 0xNNNNN
	    draw on existing external window.
     -K [1024]
	    initial width of window
     -L [768]
	    initial height of window

     -H
	    Print a short description of the algorithm explaining the -x  -s  -X
	    and -Y parameters.

IDENTIFICATION
     Author: S.Booth@epcc.ed.ac.uk

								   XMOUNTAINS(1)

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