You most likely have seen the step effector in Action. Quite popular over the last few years, the step effector is responsible for objects that fold/unfold or build up in an animation. Animator Tyler Jordan offers a foundation look at creating an animation that “builds upwards” in Cinema 4D but using C4D’s Step Effector.
Here is a tutorial on how you can build any kind of object in Cinema 4D using the step effectorTyler Jordan – TJordanArt.com
Tyler provides a simple way to get started using the MoGraph module in Cinema 4D and in particular the step Effector for creating this animated effect. Equiloud also had a great look at creating the folding and unfolding effect in Cinema 4D using the MoGraph Step Effector with the post Creating Animated Objects Using an Unfolding Effect in Cinema 4D.