I built this octet truss. Try your hand at Struck by clicking on "octet_truss.rbf" and scrolling in "new" which is the "scratch" tetra for starting a new model. Try building a tetrahelix which is easy in Struck but very difficult in a conventional XYZ modeler.

Gerald de Jong, in collaboration with Karl Erickson, developed this amazing Synergetic Geometry modeler which incorporates tensegrity {push/pull) forces and Fuller's IVM polyhedra. For more information regarding STRUCK and Gerald's "Spring Theory" visit his WEBSITE and also Karl Erickson's Springspace Gallery