These settings provide control over some advanced settings of the renderer.

Lock Sampling Pattern

Locks the AA_seed so that the sampling noise won't change with the frame number (avoiding the film grain look).

Use Autobump in SSS

Indirect Specular Blur

Low Light Threshold

Distribute Still Image Over Frames

When enabled the render is split up over the specified number of frames, allowing you to render the slices in parallel. Then you can put the slices together via a script (e.g. in Photoshop).
Columns
Specifies the number of columns of the distribution. The number frames are the columns multiplied by the rows.
Rows
Specifies the number of rows of the distribution. The number frames are the columns multiplied by the rows.
Set frame range
Sets the frame and preview range of the scene according to the specified columns and rows. Also sets the Frame range to All Frames on the Output panel.
Get coordinates
Displays the coordinates of the slices, which can be used in a script to put them together.

AOV Shaders

A list of shaders that will be evaluated after the regular surface shader. With this, it's possible to add shaders to set specific AOVs without modifying the original shader tree. If an atmosphere or background shader is set, these global AOV shaders will also be run for atmosphere and background contexts. It is useful for instance in the cryptomatte workflow.

Create New Operator Network

Opens the Arnold Operator Network Editor.