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I created this model of a racetrack with the curve and array modifier and deleted the curve after I applied the modifiers. Since I've messed around with the model too many times, there's no way I can bring the curve back by simply undoing. So my question is, is there a way I can have the camera always constrain the the edges of a model? Here's a better example:

enter image description here

I've tried duplicating the track itself and pressing the keys Alt+C and clicking Curve from Mesh/Text, but the curve isn't a regular single ongoing bezier line which a camera can follow, but instead a double line (where the edges would be)

The part where there is a bridge with a lot of vertices was not converted into a curve, but instead a bunch of just empty vertices. Here's an example:

enter image description here

I can't seem to figure out what I can do, I appreciate any help! Here's the .blend file:

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  • $\begingroup$ Thumb rule I Avoid applying modifiers unless strictly necessary, Thumb rule II If you do keep the originals safe in case you need to go back Thumb rule III Don't convert curve to mesh or vice versa without keeping the originals safe Thumb rule IV Don't erase original curves and generating objects $\endgroup$ – Duarte Farrajota Ramos Jun 18 '17 at 4:29
  • $\begingroup$ I obeyed every rule except II (since I had to cut parts of the track off to make gaps). I'll be more careful next time. $\endgroup$ – Squirrel Jun 18 '17 at 4:32
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    $\begingroup$ Only workaround I see is select one of the road edgeloops alone, duplicate it in Edit Mode, separate into a new object then convert that to a new curve. You can then smooth the curve out by changing the type from Poly to Bezier but don't expect miracles, there will be information/detail loss. $\endgroup$ – Duarte Farrajota Ramos Jun 18 '17 at 4:40

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