Editing Vtk/Quadric (section)

==Getting Started==
Here we explore the vtkQuadric method, which has been used to generate Figure 5-2 (&sect;5.1, p. 77) of the [http://www.kitware.com/products/books/vtkguide.html ''VTK User's Guide,'' authored and published by Kitware, Inc.], in an effort to learn how to draw two-dimensional spheroidal structures, three-dimensional ellipsoidal structures, and other analytically specifiable configurations. 

1. Inside VisTrails, open, then execute "VisQuad.vt" without making any changes to the default pipeline or to any module parameters:  
* Follow this directory path:  VisTrails/examples/vtk_examples/VisualizationAlgorighms/VisQuad.vt
* The default workflow pipeline is shown in the top panel of the following figure.  Upon execution, the default composite image that pops up in the VisTrails spreadsheet window is shown in the bottom panel.


<table align="center" border="1">
<tr><th align="center">Figure 1: &nbsp; &nbsp; Default</th></tr>
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  <td align="center">
[[File:QuadricDefaultWorkflow.png|350px|Default Workflow]]
  </td>
</tr>
<tr>
  <td align="center">
[[File:Figure5_2.png|350px|Default Figure 5-2 from User's Guide]]
  </td>
</tr>
</table>