In one of my previous five minute tips: Creating Pipes Using the Chamfer Tool in Cinema 4D I briefly touched on the idea of precisely measuring a distance when adding subdivisions. This sounds simple enough, but it can be quite challenging in a software package like Cinema 4D (where dimensions are arguably an afterthought).
The video below shows two different methods of measuring distances when they are at arbitrary angles. Furthermore, both methods should be easily repeatable for application to many points on a Spline. The first concept explores the idea that you can place circles at the exact position of the points on the spline and then increase their size by a measured amount to determine a new intersection. The second concept is a simple demonstration of Cinema 4D R14’s new guide object (it really excels at arbitrary angles with the right settings).