Wouldn't it be great to take a photo and have your model elements behave as real 3D elements in the scene created by the photo? ie. A background photo that you take, becomes a real 3D scene, no modeling required, just drop in your model and move it around the 3D photographic scene, with correct perspective. It is possible...it is called camera matching and it is available in C4D R14!
Match your 3D camera to virtually any image with the Camera Calibrator in CINEMA 4D R14. Simply draw lines or grids on top of the image, and the vanishing point, focal length and orientation of the camera will be calculated. Add a pin to solve the camera's position, and set the scene scale by adding known lengths for any line. Quickly create a background object, or generate a camera mapping tag to begin using the image as part of a matte environment.