3D Rails good interpolation methods?

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Hello, I have been experimenting with 3D Rails,
I wanted to generate an editor where you set some points
and the whole track is interpolated circular.

My greatest problem is detecting wether the track piece should be curved convex or concave.
Right now I have just set it to alternate between the two forms each trackpiece.

Did anyone made some experience on this subject yet?


Yes I think was Ian who did a Bezier Library , perhaps this lib can help you... I'm not sure where is (we have a lot of stuff here).

Sorry I think was Hemlos.