[vtkusers] X,Y,Z -> STL?

[Donald S Dunbar]

I would like to do the following:
	input topography as a set of unstructured (X,Y,Z) grid points
	generate a surface (i.e., the ground)
	output the surface as a stereo-lithography file (STL)

So far I've managed to input the data, generate a surface using 
vtkDelauney3D, and look at it.  I don't know how to take the next step; 
that is, convert the unstructured grid output of vtkDelauney3D to the 
PolyData type required by vtkSTLWriter.  Can someone please tell me how 
to complete this, or suggest a better way.  Thanks.

Don Dunbar
Lorax Environmental
Vancouver, BC