When importing a BVH file with a parent node that has more than one
child that have offsets within `0.001 * global_scale` of the parent
node, the length of the parent node is considered to be zero.
For example: A parent node with `OFFSET 0 -0.1077 0`, two children with
`OFFSET 0 -0.1074 0`, and a global scale of `1.0`, the parent node's
length would be considered zero, therefore adding `global_scale / 10`
(`0.1` in this case) to the y component of the offset. The resulting
tail offset would then be `OFFSET 0 -0.0077 0`.
Ref !105492
e2ff0a45aa