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How to generate a curve from a model ?

I have a road model which is a long looped curve made in Blender then exported to FBX. To make this model, I have created a path and then repeated a portion of road all over it. Now for my game, I need to get this path back so I can create two lanes for my IAs and player to follow. I would like to know if it would be possible to extract this path from the model topology via script and if so how ? That would be ideal so that when I make changes to my model, the paths can be recreated again automatically. If not possible I'd like to know how I could create those paths otherwise visually in the editor ? This is the model I'm talking about : ![alt text][1] [1]: /storage/temp/51876-road.jpg

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