Samuel Winter shows how to create and use custom object icons in C4D R21.
New in Cinema 4D R21 is the ability to use custom object icons for objects and tags within the trusted object manager. Check out this tutorial from Digital Meat (Samuel Winter) shows us the process for creating and using your very own icons in the object manager.
There may be times when you are working with super-large files. When that happens, you could be looking at what seems to be an ocean of icons that all look the same. Now with R21, you can create custom ones so that you can have a better overview at a glance. In R21, objects and tags can be assigned their own icons or existing icons can be re-assigned or colored.