Files in the directory
======================
undeformed.obj: is the undeformed mesh of the object.
monkey_1-*.obj: are the animated frames of a falling monkey.
bvh.txt: describes a connected BVH for the object. The format of this file is 
         described below.


File format of the BVH file (bvh.txt)
=====================================
All the lines beginning with '#' are comments, and should be ignored when loading
the file.
1st line has three integers: 
    [number of BV nodes] [number of triangles] [ 1 ]
the following [# of BV nodes] lines describe the BVH: each line has three numbers
    [id of BV node (0-based)] [id of parent node] [1/0 indicating if the mesh on the node is connected]
then the following [# of triangles] lines describe how the triangles are assigned to 
eacho leaf nodes: each line has two numbers
    [id of the triangle (0-based) corresponding to the obj mesh file] [id of the leaf node where the triangle is contained]
