ity 
   ... </pre>
<h3><a name="export"></a>ASCII input of model</h3>
The exported model (e.g. a synthetic model) can be loaded from file into workspace. 
<h3><a name="exportvtk"></a>Export vtk file</h3>
The model can be exported to a vtk (Visual Toolkit) file, which can be viewed with the
free and powerful 3d viewer <a href="http://www.paraview.org">Paraview</a>
<h3><a name="dreid"></a>Read in 3d file</h3>
not yet implemented! 
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