I've just created and Away3D TruncatedCone Class based on the Away3D Cylinder class.
This classe makes it possible for the user to create a truncated cone or a Cylinder with different radius at top and bottom. I don't know if there is any interest in adding this class to the Away3D Base Class or to Substitute the Cylinder Class so it can support different radius at the Top and Bottom of the Cylinder. If there is any interest, I'll upload it and make it available. Felipe.
