This video is intended to help familiarize you with the Bella GUI, which is an application to which you can export, if you prefer not to render directly in your plugin. This export & render approach allows you to keep working on your model, as Bella works on your image.
This video demonstrates use of the Bella PBR, Principled, and Uber materials. The PBR material is a simple single-click material that makes it easy to use PBR texture sets. The Principled & Uber materials provide more control.
Bella for Rhino - Cameras
This video provides an introduction to working with cameras in Bella for Rhino.