Ribbons are particle streams that can be emitted from other particles. They're useful for things like contrails. Here we show how to set one up to stream from another set of falling particles.
(00:05) - Intro and Material
(02:32) - Setting up the Behavior
(05:52) - Creating an Emitter from Scratch
(11:04) - Recap

A link to the wiki for further notes is available here -