This is the pycao modeller. In short, this is a tool to describe a 3D-scene using the python language, with plenty of simplifying paradigms ( carrying objects in boxes, genealogy system, compact mathematical notations, markers ... ). Then you can see your 3d objects using povray as a plugin.
The documentation is available on my home page at the university of Angers. http://math.univ-angers.fr/~evain/software/pycao/distributed/documentation/