Do you mean the silhouette?
Do you want to compute it once, or do you look for a data
structure to accelerate the computation for many viewpoints?
If it is just once for a view point at infinity then you might
use the Lower Envelope package.
I'd like to know if there is an easy way to get the contour
of any 2d or 3d geometry (a triangulated surface for example).
IGN / SD
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Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project
phone: +33.492.954.912 skype: andreas.fabri