I've got a scene that I've motion tracked and it seems to be working well. Then I used "Setup tracking scene" to create a cube layer, then a floor layer that would only exist to act as a shadow catcher. When I render this in Blender Render, such as Blender Guru does in his tutorial video, it looks fine. However, because of what I would like to do with this scene in the future, I would rather use cycles instead of blender render. However, I don't think the nodes are set up right or something because when I render it in Cycles, the floor layer still appears. I would like the floor layer to only act as a shadow catcher AND (this is hard to describe) a layer where anything behind it would not be rendered. So like if I had a cube that stuck through the floor layer, only the part that is in front of it would be shown. I should also note that I have no experience with nodes, so that's probably the problem.