You And Me Academy has a look into creating a shadow catcher in Cinema 4D Redshift.
One of the most critical passes might be a shadow pass. You can render shadows on an additional image to later composite it back into your scene for more control and also create objects that look as if they’re in stage without having to build them yourself!
How to Create a Shadow Catcher in Redshift.
Learn how to create a render only for shadows in this latest tutorial from Joe Lawrence with The You and Me Academy. With Redshift, it was done through the material before now – but Cinema 4D has made adding tags simple!