MASH surface slide

Attaching an object to another is easy but getting it to slide across a surface takes an extra step. It's still easy and retains a lot of control once the effect is done.
Check out a simple MASH crowd: vimeo.com/6988...

[@steveherridge8965]

How do you move geo across a pipe or more 3 dimensional object?

[@xiaohuwang3221]

nice vid, thx

[@Crick2x9]

Is there a way to tell MASH to move objects along a polygon edge only? (trying to recreate a Tron look effect)