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@eiffie:   now I understand how it works, and it works perfect   - Now I have to design a DE-estimated land-rover for an exploration mission to a KIFS fractal  

@Syntopia: No, you were right, the ring was just to show the orbit I'm moving the object, and how with orbit aligned to some planes it worked fine and in other arbitrary angles there was the undesired rotation problem, just happened that with a DE sphere the normal also aligns with the ring, but the idea is to use on arbitrary DE objects indeed:

<a href="https://dl.dropbox.com/s/xijy4pu0xbl00xc/alinormal_001.swf" target="_blank">https://dl.dropbox.com/s/xijy4pu0xbl00xc/alinormal_001.swf</a>

Here I'm using a normal a bit far from the surface, to make the movement smoother, and getting rid of little details... on a more complex fractal surface the object moves drastically because I'm taking only one normal and it varies a lot. Now the challenge is to make a nice vehicle reacting as real as possible when it moves over the surface.. but that's another story, will see later how it can be done...

many thanks for your help and comments.