If you think about each piece in terms of adding a delta x and delta y (change of position) and delta angle (change of direction) to your current location and direction, it shouldn't be too difficult to lay pieces end-to-end until you either get a collision or a correct match, or you run out of pieces. Switches are indeed more difficult, especially switches with a numerical frog angle, but I think if you solve the issues in placing a curve to turn left vs a curve to turn right, you'll be well on the way.

As has been stated, this is a graph theory situation, and Winston's AI book is well worth checking out.

Don Wilde
"There's more than one level to any answer."

In reply to Re: Closed geometry: a train track problem by samizdat
in thread Closed geometry: a train track problem by SamCG

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