[vtkusers] 3D silhouette and 2D silhouette

[Rachel]

Hi All,
I want to extract the boundary (silhouette) of 3D model (represented by
mesh)  then generate an image of the silhouette.her some examples:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ExternalContour

http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/Silhouette
 
I have some questions 
1. Does the points of the silhouette is set of points extracted from the
mesh or just set of points that are independant of the points of the mesh.
If the silhouette is respresented by set of points of the mesh , how do we
generate them.

2. How do we know from the 2D image which pixel of the silhouette correspond
to which points on 3D silhouette (or mesh)

Many Thanks 


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