LOLercoaster

I am coming to the end of making my first game LOLercoaster a draw and load rollercoaster gameI have a physics issue that I can't over come. I found an old topic regarding LineRider that seemed that it would answer my questions but the cap files are dead links now.

Question:

I am trying to get an object to follow a path in the style of a rollercoaster any idea how I can do this using gravity?, I have messed around with it quite a bit with no luck.

Having specific (increased) gravity at the bottom of each valley on the track route is my main problem. Any advice would be helpful. I intend on making a tutorial for he community when I get this all figured out.

Thanks in advance.

*few ideas i tried were creaing a ton of sprites with physics properties and using them as "rollers" that worked ok but is definately not giving the intended "smoothness" I am looking for.

Your best bet is to put the 'rollers' on the car itself and not the track.

You shouldn't need to add any 'extra gravity' or anything at corner points - Unless box2D doesn't take centripetal forces into account (I'm not sure on this one)

Hey boggler!

I don't know if this might help, as I haven't mucked with gravity too much, but could you use the y-coordinate of the moving object to determine how much gravity to apply? As the y increases, so does the gravity, and vice versa...