If you look at the OCC online help under Technical Overview, I
recommend the following order:
- Overview of Object Libraries
- Foundation Classes
- Modeling Data
- Modeling Algorithms
- Visualization
- Application Framework
- Data Exchange
Links to the PDF users guide for these can be found in the
Reference Documentation section of the help. Also, it is a
good idea to check out "My First Application" at:
http://www.opencascade.org/org/gettingstarted/appli/
Finally, the Draw test harness is a valuable tool for
experimentation. So, check out the users' guide under
Development Tools in the Reference Documentation section
of the help.
Good luck