.bf - bone forests

A .bf file contains a bone forest. That is possibly multiple bone trees, or skeletons. Singleton trees will be interpreted as point handles. Otherwise each edge in a tree will be interpreted as a bone segment.

Each line contains data about a vertex (joint) of a bone tree:

[weight index] [parent index] [x] [y] [z] [undocument optional data]

Indices begin with 0. The weight index is -1 if the bone does not have an associated weight. The parent index is -1 for root nodes.