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    <title>libigl file formats | .bf</title>
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    <h1>.bf - bone forests</h1>
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    <p>
A .bf file contains a "bone forest". Normally a skeleton for linear blend
skinning is a "bone tree" with a single root. But this format may store
multiple trees, hence a forest.
    <p>
Each line contains data about a vertex (joint) of the bone forest:
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    <pre><code>[weight index] [parent index] [x] [y] [z] [undocument optional data]</code></pre>
    <p>
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. The x,y,z coordinates
are offset vectors from this joint's parent's location (for roots, an offset
from the origin).
    </p>
    <p>See also: <a href=.>file formats</a></p>
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