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    <title>IGL_LIB file formats | .tgf</title>
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    <h1>.tgf - control handle graphs</h1>
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    <p>
A .tgf file contains a graph of describing a set of control handles/structures:
point controls, bones of a skelton and cages made of "cage edges".
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The first part of the file consists of lines regarding each vertex of the graph. Each line reads:
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    <pre><code>[index] [x] [y] [z] [undocument optional data]</code></pre>
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Indices begin with 1 and should proceed in order.
Then there should be a line with a sole:
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    <pre><code>#</code></pre>
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The next section concerns the edges of the graph. Each line corresponds to an edge:
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    <pre><code>[source index] [dest index] [is bone] [is pseudo-edge] [is cage edge] [undocument other data]</code></pre>
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Bone edges trump pseudo and cage edges. 
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