Robert Leger with a follow up on the pop up book rigging techniques with this tutorial showing how to Get the Normal Vector in the Center of Three Coordinates in Cinema 4D. Robert mentions: let’s say you have three points, objects, whatever and want to not only get the orthogonal vector (normal vector) of the invisible plane between these coordinates, but also the position in the center of these three coordinates.
Check out the tutorial for How to get the Normal Vector in the center of three coordinates here