Select Stereo > Editors > Custom Stereo Rig to open the Custom Stereo Rig Editor window.

The Custom Stereo Editor is used when you want to create a custom stereocopic camera rig with MEL or Python scripting.

Modifying existing rigs - displays all the editable rigs you’ve created in the scene.

Registering a new rig - creates a new rig for the scene. Enter in the Custom Rig Name, select the type of Language used: MEL/Python from the drop down menu and the enter the procedure you want to occur for the rig. Click Add New Rig to create the new rig.