treeBaseHandle: the handle of the object that describes the hierarchy tree, or sim.handle_scene for all objects in the scene.
: the object type
to retrieve or sim.handle_all for any type of object in the tree
bit0 set (1): exclude the tree base from the returned array
bit1 set (2): include in the returned array only the object's first children. If treeBaseHandle is sim.handle_scene, then only parentless objects will be included.
objectCount (out value): the number of returned object handles