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Silhouettes are the only view-dependent part. A brute force method
will be at interactive so long as the number of surfaces and the
amount of silhouette testing are kept reasonable. Defining the bounds
on reasonable depends on machine and program speed as well as the
number of control points for the NURBS model.
I have explored three methods for finding silhouettes for a given
viewpoint. I will define the methods as Mesh Method, Tessellated-Mesh
Method, and Srf-Node Method.