I have little experience with computer graphics and I would

be grateful if you could give a tip on how to solve the following

problem:

I want to obtain a 3D visualition of an object. What I have is

a set of horizontal cross-sections of the object. For example

suppose that the object is a tree whith two branches. My first

sections (bottom of the tree) are a kind of a circle and the last

ones (top) show two smaller circles. I could describe the sections

by countours, but I don't how to form the triangles (or other polygons)

needed by most 3D visualization programs that I know.

Thanks in advance.