A quick and very easy tutorial explaining how to save your render so that you can easily import it as an object layer in Photoshop. http://www.pixel2life.com/forums/index.php?showtopic=792
Learn to save your images in the optimal image type so it can be read and dealt with in photoshop. http://www.visualdesigncore.com/tutorials/Cinema4d/Saving-in-Cinema-4d...