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Rename fracture piece @name attribute with padded numbering in Houdini VEX.
// Fractured pieces are generated with @name such as 'piece0', 'piece1', etc.
// The following prim wrangle renames each piece with a padded number.
// String var to hold padded piece number.
string new_name = sprintf("piece_%04d", opdigits(@name));
// Update piece name.
s@name = new_name;
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