The Arnold section in the Preferences window (Edit > Preferences...) contains global application level settings.
When enabled, the Arnold plugin menu is added to the application menu bar as a separate entry.
When disabled, the Arnold plugin menu is under the Extensions menu.
The default material system decides whether a Node Material or an old Arnold Material (legacy) is created when creating an Arnold material from the plugin (e.g. Create > Arnold menu in the Material Manager, context menu in the IPR window, etc.).
When disabled, no Arnold material previews are rendered in the scene, either Arnold Material or Node Material.
When disabled, no shader previews are rendered in an Arnold Node Material.
When disabled, Arnold materials are not displayed in the viewport, either Arnold Material or Node Material.
Select the preview scene displayed when a new Arnold Material is created. Preview scenes have to be located in the application or user material preview folder (e.g. %HOME%\AppData\Roaming\MAXON\Maxon Cinema 4D R25_1FE0824E\library\materialpreview).
Select the preview scene displayed in the Node Editor when a new surface type shader is created. Preview scenes have to be located in the application or user material preview folder (e.g. %HOME%\AppData\Roaming\MAXON\Maxon Cinema 4D R25_1FE0824E\library\materialpreview).
When disabled, Arnold lights are not displayed in the viewport.
Select a folder which will be set as the LUT folder by default in a newly created tonemap imager.
Select a LUT file which will be set by default in a newly created tonemap imager.
When enabled, the selected color manager will be set when a new scene is created or a new render settings is added to an existing scene.
Defines the color manager used in the scene.
Third-party Arnold plugins (shader, procedural, volumes) can have DLL dependencies on Windows, which have to be loaded when using the given plugins in Arnold. List folders here which contains those DLL dependencies. Environment variables can be used (e.g. $MY_ENV_VAR).