How to get nice reflections in PhotoMatch.
This Tip is more like a reminder.
Well here it comes.
When you are making your photos on location don’t forget to make photos of the opposite side of the place.
(really base80 this has absolutely no relation to 3d and such)
Also try to get as much of the environment on photo, like the side-walk, the street and the sky if it is an urban scene.
Then in Cinema4d you can rebuild the environment of your scene in rough volumes and add a compositing tag, uncheck Seen by Camera.
For the sky I still use my procedural skies (downloadable on this site)
The same goes for interior PhotoMatching the more photos you have the better it is.