Straightens guide curves out towards their normals, starting at either their tips or their roots.
To apply: Select at least one point on each of the guide curves you want to puff, choose either Modify 
Puff Stand on End from the Hair panel to straighten from the tip, or Modify Puff Puff Roots to straighten from the roots. Then drag the mouse left to right in the 3D views. The further you drag, the more the hairs
are straightened.
Note that the Hair Puff Operator is also applied when you choose Modify Comb Along Normals.
To display: Select the hair object, click the Selection button on the Select panel, and then click the Hair Puff Operator icon.
For more information, see Puffing and Straightening Hair [ Hair ].
