Custom Render Passes
To render out custom passes for your cinematic refer to the following steps.
Inside Sequencer click the Render Movie Settings button.
In the Render Movie Settings window, change the Output Format to Custom Render Passes.
Select the desired Render Pass(es) from the Include Render Passes drop-down. You can include more than one pass as part of the export process.
If you do not specify which render pass(es) to include, all available passes will be included as part of the export.
Depending upon the number of frames in your sequence, this may result in hundreds of files being generated for each available render pass.
(Optional) Click the Minus button next to a render pass to remove it from the export.
Specify the Output Directory and Filename Format, then click Capture Movie.
If you use the default Filename Format, your files will automatically be named based on the render pass it reflects.
Once the render movie process completes, in your output directory there will be an image file for each frame of your sequence that corresponds to the selected render pass(es).
If you selected more than one render pass, you will have a separate set of image files for each pass. Below is an example of an render pass for Scene Depth next to the original shot from the full scene.
Exported Scene Depth