Camera move

How do you isolate the floor from the images as the camera sweeps the "scene"?
For example, in one of Mark Spencer's tutorials he is rotating four images on a floor.
His floor doesn't seem to be moving while the camera rotates about the images.

And Mark says the images have "Reflection turned on." Is there a reflection filter?
He has a great tutorial on making the reflections, but if there is an easier way . . .
Thank you for your time,
Jim

What version of Motion are you using? Also have you got the link to the video? I can have a look and tell you about the floor. Depending on the version of motion depends on how you get refections to work.

Thanks for responding, but I found the answer in Mark Spencer's "Deep Dive"
Add background as the bottom layer and make it 2D. 2D objects at the root level are not affected by the Camera move. So the contents of the background layer stay in the same place.

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