The Maya Integration section allows control over various Arnold system settings.
A switch for enabling or disabling swatch rendering in the Hypershade window and Attribute editor.
Maya Render View
The image is rendered several times with increasing AA samples until the full quality set by the Camera (AA) samples in the Render Settings is reached. Disabling this option reverts to the usual rendering option.
The initial AA samples used for the first progressive render. Negative values sub-sample the render, allowing faster feedback in the render window.
Initial Sampling Level from -6 to 0
Clears the render view before re-rendering the scene. Also, displays a border around the bucket being rendered.
Specify whether Arnold needs to update its scene data to match the Maya scene every time IPR refreshes. If changes aren't being reflected in IPR, turn this on.
Clears the texture cache, forcing textures to be reloaded.