Deep render AOVs work with Deep ImageRenders frames with multiple depth samples in addition to typical color and opacity channels. rendering in the Direct Lighting and the Path Tracing kernels. When enabled, all render passes enabled in the Render AOVs node are written to the deep pixel channels. By default, only the beauty AOV is written.
Note: Enabling this feature can use a lot of VRAM if you are rendering a large image.
Figure 1. Deep Render AOVs are enabled through the Kernel node