IPO are keys which control animation curves. The original concept of this tutorail is to use these keys to control "at sight" the changes of the shape. The idea comes from two excellent tutorials , The Cave of Thorsan A and A Ride through Mine.
1. The original profil
We start on with the generating of a NURBS curve which will be the track/profil.
For that we use the menu Surface >> Curve.
We tap twice TABKEY for record the curve ...
...and we modify this curve until convenience.
-- In this particular case, some vertices
have been added.
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