From FreeCAD Documentation
- Click the names of the scripts to see the screenshot. The scripts that do not have a link probably cannot be executed under FreeCAD. But even so, please try to look at the code. These scripts may still give you some ideas.
- There are many other drawing files (Inventor 2.x format) that can be loaded in FreeCAD and saved as a python script. The formatting will not be great, but such a script can still help you understand the COIN3D library.
- Generally, COIN3D doesn't provide good primitive drawings. The widget system Design456 does provide some: some basic shapes, and also some complex shapes. The arrow widget and the line widget used by the Design456 Workbench are examples.