Prismatic joint to rail joint

@Simeon or @John please take a look at this for a possibility in a future update:
It takes the prismatic joint and creates a guided rail (defined by splines or sine function it seems), this could be VERY useful for games. Thanks.

Video if you or others are interest (it’s in the link anyway):

Also this implementation of a slider joint (Prismatic with min value and max value):

I’m thinking this is one of the reasons Codea should open source the runtime…