Allows you to clear and regenerate the whole Arnold scene. This avoids having to close and re-open the RenderView.
Clear Scene on IPR Stop
Clear the whole Arnold session when the IPR is stopped. When the IPR is restarted, the whole scene is converted from scratch (as with Update Full Scene).
Shows the list of cameras in the scene, allowing the choice of which one will be used for rendering. This list also appears in the Toolbar as a drop-down menu.