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I have 4 coordinates which is not in parallel (measured with total station on site) and it is not quite a circle, more like ellipse.
So how do I draw an oval (circle/arc like) line in 3D, or between these 4 points that i've taken from the total station.
One way to do this is to approximate the arc with chord segments using a 3d polyline. Some 3rd party software reduces survey data in this maner.
You can find a very useful utility from the below site:
It appears 3dutil.cip at http://www.cadresource.com/library/lisp0a.html
may be what you are looking for.