there are,
but method depends greatly on the complexity of the object your trying to trace and the purpose.
For background figures, f.ex. i would just "billboard" them, or map them on a primitive.
For other cases, like airplanes you would need top view, side view, frontview and ev. a perspective view for reference, then you would try to start with drawing splines or polygones, following the views.
There are maybe even other methods...
edit:
this is the right section;
i deleted the post in the c4d section, as this is a request and not a tutorial...
dont always listen to the old guys ...
Edited by Scythar, 08 April 2008 - 09:08 AM.