I have some animations both using regular bones and using the biped system in 3ds max. I'd like to get all the associated data and output it to a custom file format (such as json) via maxscript. I guess the part where I'm completely lost is how to get the position, rotation, length and children of every bone of my rigs, as…
Exporting all that data is not trivial. What's your goal? Do you plan to read it back in? Can you not use FBX Ascii exporter format? Or the built in Autodesk Collada XML exporter?