The Maya Integration section allows control over various Arnold system settings.
Progressive Refinement
The image is rendered several times with increasing AA samples until the full quality set by the AA Samples in the Render Settings is reached. Disabling this option reverts to the usual rendering option.
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Initial Sampling Level
The initial AA samples used for the first progressive render. Negative values sub-sample the render, allowing faster feedback in the render window.
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Initial Sampling Level from -6 to 0
Clear Before Render
Clears the render view before re-rendering the scene. Also, displays a border around the bucket being rendered.
Force Scene Update on IPR Refresh
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.
Force Texture Cache Flush after Render
Clears the texture cache, forcing textures to be reloaded.
Enable Swatch Render
A switch for enabling or disabling swatch rendering in the Hypershade window and Attribute editor.
StandIn Viewport Override