You can enable spooling in the RenderMan Preview Queuing section of the Maya Preferences window.Since its introduction over twenty years ago, Maya has become a de facto 3D graphics application for use in the creation of TV shows and movies, visual effects, games, and even architecture. These applications manage a list of rendering jobs. It is also possible to spool preview renders, which means the job is passed to a queuing system: either LocalQueue or Tractor. Preview renders are launched directly from Maya by default. Note, the Render View is only available when spooling is not enabled. In the RenderMan section of the Maya Preferences window, you can select between 'It', 'Render View', or 'Use Global Image Format'. The pixels from preview renders appear in 'It' by default. Zero threads means all processors will be used for rendering.

It's advised to leave at least one thread to allow for interactivity in Maya while rendering is underway. The default value of -1 means that all but one CPU will be used for rendering. In the threads section of the RenderMan Preferences, the Rendering Threads setting is used for both Preview and IPR renders. The cancel button in 'It' also works to stop renders whether spooled or not. For non-spooled renders, hit the Esc key in Maya to stop the render. This can take some time, so you'll often want to stop the preview render while it still looks noisy. Preview renders will render until the image has converged. The only difference is that the button in the RenderMan shelf always switches to RenderMan before starting a render. The usual methods in Maya for rendering the current frame also work. The Image Tool (it) pops open by default. Preview Rendering (also known as Render Current Frame) can be started by clicking the render button in the RenderMan shelf.

Arnold render view