Parametric trusses using pattern controller

Pattern controller in Para 3d v3.0 allows users to interweave result of other controllers by user defined pattern, in this video you see how to use the pattern controller to switch between two splines of a curve. The curves themselves belong to another array and a parametric array link controller is extracting them from the array according to the index of splines in Para Shape.
Para Shape is new parametric object added to Para 2.8 and can be used to create spline shapes with constant number of vertices and splines.
Notice that in the beginning of video I created the array from a selection of existing scene objects, this is also new feature of para 3d v 3.0.