Depth Matte (PB only)

This effect reads the z-depth information in a 3D channel image file and can slice the image anywhere along that z axis. Use this effect to matte everything in front of or behind the value you specify. For example, remove a background in a 3D scene or insert objects into a 3D scene. Simply create two layers with the 3D channel file; then, in one layer, matte everything behind a certain point. In the other layer, matte everything in front of that same point, so together, the two layers make up the original image. Then insert a layer between them with the object that you want to composite into the scene.

For more information, see the After Effects product section on Adobe's Web site.