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The auxilliary function WriteChunk is for those who can only use
Mathematica on a computer that Geomview isn't installed on. 
WriteChunk[file,
graphics] generates a file named file which contains the
graphics object graphics in the format accepted by
math2oogl.
   
You can transfer that file to a computer that has Geomview installed on
it and then use the programs math2oogl, oogl2rib, and
geomview directly from the shell.  These programs are distributed
in the bin/<CPU>
subdirectory of the Geomview directory, and may have been installed so
that they are on your path.
     In[1]:= <<OOGL.m
     
     In[2]:= Plot3D[ Sin[x + Sin[y]], {x,-2,2}, {y,-2,2} ]
     
     Out[2]= -SurfaceGraphics-
     
     In[3]:= WriteChunk["mychunk",%2]
   This writes the file mychunk which contains a description of the graphics object. You can then transfer this file to a system with Geomview and type
math2oogl < mychunk > mma.oogl
to convert it to the OOGL file mma.oogl which you can then view
using Geomview. This is the equivalent of the WriteOOGL command.
   
For a result equivalent to the Geomview or Show
commands, type
math2oogl -togeomview Mathematica geomview < mychunk
The WriteRIb command can be emulated from the shell as
math2oogl < mychunk | oogl2rib -n mma.tiff