Roller Coaster Ride Simulation -- Cedar Point Pipe Scream

This is a Geogebra emulation of a ride called the Pipe Scream at the amusement park Cedar Point in Sandusky, Ohio. You can see a YouTube video of the ride at You must click on the animation "On" button in the bottom left of the 2D window and then watch the result in the 3D window. xPoint is the center of the circle which rides on a sine curve. Then a circle perpendicular to the normal of the curve has a point on it which travels around its circumference. Both xPoint and the point on the circumference are animated.