Automatic UV
This page covers the Automatic UV function in Cinema 4D. It generates an optimized, overlap-free UV layout with packed islands in one step — a fast starting point for texturing and baking, and it can also be limited to a polygon selection.
This function attempt to apply an optimized UV mapping based on the object to prevent parts of the UV mesh from overlapping, which is quickly the case with more complicated objects. In addition, depending on the parameters set, groups of UV polygons are arranged at a fixed distance from each other and with maximum utilization of the texture area. You can also use this tool with an active polygon selection if you just like to unwrap a part of your object.
Just keep in mind that Seam Selections and Pins are ignored by this tool.
If you need more control over how the object is divided into different sections and UV islands, the UV Unwrap and Relax tool offers more flexible options for this.