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APLOT(9.1)							    APLOT(9.1)

       aplot - isometric plots of data arrays

       fb/aplot	[ -a ] [ -llightfile ] [ -ttype	] [ -rrange ] [	-w x0 y0 x1 y1
       ] file

       Aplot draws an anti-aliased isometric perspective plot  of  the	square
       array  of  elevations that it reads from	file.  The output is a picture
       file, written on	standard output.

       Option -t specifies the type of the data	in the binary file.   Possible
       types are

	      s	   short  i    int  l	 long f	   float d    double c	  char
	      u	   unsigned char

       The default is -t f.

       Option -w sets the WINDOW= attribute of the output image.  By  default,
       the image is drawn in a 640x512 window.

       Normally,  the  data  is	scaled to make the plot	fill the window.  This
       default scaling can be overridden by option -r, in which	case the  data
       is scaled so that range is the magnitude	of data	values that would make
       a plot that just	fills the window vertically.

       Option -l gives the name	of a file describing how to shade the  surface
       and  how	 shiny the surface is.	By default, a not-at-all shiny surface
       is lit from above by a single light  source.   The  lightfile  contains
       lines of	the following forms:

       light x y z brightness
	      specifies	light source of	the given brightness shining in	direc-
	      tion (x,y,z).  There can be up to	16 light sources.  The default
	      light is in direction (2,3,9) and	has brightness 1.

       ambient brightness
	      specifies	 the  brightness  of  then  ambient  (non-directional)
	      light.  The default is 0.02.

       diff reflectance
	      sets the amount of diffuse reflection  from  the	surface.   The
	      default is 0.98.

       spec reflectance
	      sets  the	 amount	 of specular reflection	from the surface.  The
	      default is 0.

       bump height
	      sets the width of	the specular reflection	bump.  Larger  numbers
	      produce tighter (less diffuse) bumps.  The default is 80.

       Option -a suppresses writing an alpha channel into the output file.  By
       default,	the output has CHAN=ma.


       picfile(9.6), filters(9.1)

       Input files are assumed to use native byte  order  and  floating	 point
       format, and so are not transportable, except under option -t u.



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