I have received several requests to post the Grasshopper definition for rib system screen shot I posted here.
I did not post it before because the definition was extremely unorganized and very "touchy".
I have since rebuilt the definition to be compatible with GH v.0.6. Also, the definition no longer relies on solid booleans to create the rib notches (I have found solid booleans to be extremely unreliable in Grasshopper).
Anyway... now available by popular demand:Click Here to Download Cylindrical+Vertical Ribbing 1.0
Note: I make no guarantees for how well the definition works. Sometimes it has problems when a vertical rib intersects a surface seam... Suggestions welcome!