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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  pro-
       gram  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 ig-
	      nored 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
	      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 allo-
	      cates.
       -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 illumi-
	      nated 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  dou-
	      bles 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)

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