Mine tutorial & rollercoaster-like

hi all,

I’ve followed the “ride in the mine” tutorial and now I’m trying to make a rollercoaster based on this tutorial; But every time I try to make a half-turn to the Bezier curve my track gets upside-down. I mean, the part just before the half-turn is OK, and after it’s upside-down. Maybe I’m not clear enough, I don’t know exactly how to explain that, so here is are some screen shots:

Any idea? I really don’t know what to do.



i’m answering to myself…
There seems to be a good tutorial on that subject, I didn 't see it earlier: http://membres.lycos.fr/bobois/Tuts/Courbes/completeRC/foreword_en.html

I think this should answer my question :slight_smile: