Revit provides many RPC objects that you are licensed to use in rendered images for Revit projects. If desired, you can download ArchVision™ Dashboard to obtain and manage additional RPC content to use in projects.
ArchVision Software Licenses are sold separately. Go to http://www.archvision.com to learn more. (If you do not own a license to use the additional RPC content, it renders with watermarks.)
On the Options dialog, use the Rendering tab to configure Revit to connect to ArchVision Dashboard using 127.0.0.1. Use ArchVision Dashboard to configure a path to RPC content.