Samuel Winter shows a few ways that you can create a spline projection in Cinema 4D.
There are just some tasks that are commonplace when producing motion graphics and animation, and with Cinema 4D, one of those is the spline projection. As with anything in a 3D DCC, there are several ways to do one thing. Showing off some of the ways that you can create a spline projection in Cinema 4D is Digital Meat (Samuel Winter) in his latest tutorial video.
Winter walks through several methods for projecting splines on to geometry using a simple displaced example and a spline. Winter also covers the advantages and disadvantages of some of the ways.