This post is an updated version of this one.
I reworked the demo to have several loops. A loop is the name of an animated hierarchy of objects (here cubes and dummy objects). Loops are based on the code available HERE.
The loops are available in OpenGL 2.1 so they can run on the Raspberry Pi too. As usual, just drag-and-drop any loop demo (for example loop_099_gl21.xml) into GeeXLab and enjoy.