Recently we held a 3-day intermediate Rhino and Orca3D training class in our office, with nine attendees coming from a range of backgrounds. The third day was devoted to Orca3D, and turned out to be a very busy day!
We're making the Training Notes and associated example files available for download. They're written for use in a classroom with an instructor, but you may find some of the exercises and examples to be helpful as you learn more about Orca3D.
The files are all contained in this 20 MB zip file: Download Orca3D Training Files