Couple of ways to do this. If you are working CS6 you can create an environment layer. Press Cntl+K and click the advance tab and change your Renderer to Ray Traced 3D. Drop the layer into your comp, right click on the layer and choose environment layer.
Or Create a new comp and add a camera. Drag in your layer and go to Effects>Perspective>CC Environment.
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.