Use the 3D Keyer node to key out a given range of colours. The 3D Keyer provides a high level of control over the settings of the key. You can also view your animation data in the Universal Channel Editor.
You can access the 3D Keyer directly from Batch. When you click a 3D Keyer node, the controls appear at the bottom of the screen; you do not need to go into the Modular Keyer to access the 3D Keyer.
The 3D Keyer node accepts a front clip as input. You use it as the key-in clip, to create a matte for the front clip. See 3D Keyer.