at what you actually want is a 3d convex hull..Finally found Mateusz Zwierzycki's 3d Convex Hull (the latest version)http://www.grasshopper3d.com/forum/topics/incremental-3d-convex-hulland then you just extract mesh edges.(I replaced the Line inputs as you didn't internalize them in the initial file, so just replace them back)Edit: just found out that the component is included in the Starling Plugin under slHull3dhttp://www.food4rhino.com/app/starling?ufh=…