The following exercises will have you use several aspects of OpenBuildings™ GenerativeComponents to create a rig and support structure for a free form roof/tunnel. You will start by building one rig and the replicating it along a curve and use the rig endpoints as attachment points for a surface. The surface is then converted to polygons and the polygon vertices are then used as attachments for a crossbar structure. You will create and attach the crossbars and finally, you will edit the base curve and see how the associativity works.