This one is quite Interesting I think. During the Anomalia rigging workshop in Litomyšl (Czech Republic) the instructor Josh Carey from ReelFX has constantly used follicle constraints for all kinds of rigging topics. In Softimage language a follicle constraint is just a simple surface constraint. But that was not what I found interesting. I liked the way Josh was creating the constraints. He had a small script that searched the closest location from locator, read the u and v coordinates of the location and appled a surface constraint with exact this coordinates. With this technique it is quite easy, to get the controllers exact to the point where I want them. In the case of surface constraints, it is not always as easy as you think.