Rotating Strands 

Rotate strands modifier defines the twist value of individual hairs. Normally, the rotation in hairs around their stem doesn't matter because they are cylindrical. However, there are also times where such a rotation plays a big role. For example, if you use the Mesh from Strands modifier to skin a flat billboard or a proxy mesh along the length of each strand, you need to define which way the said billboard or proxy mesh will be facing. If some operation is performed around a guide, such as curling, it is also important to define the starting rotation of the guide's stem.

This operator gives you the control of defining the rotation around the individual strand stems. You can have the strands face in a particular direction, for example, towards the distribution surface, or you can have them be randomly orientated.

 

Parameters 

  • Apply to Group
    An strands group created in the Edit Guides modifier can be used here to rotate only a part of the hair.
  • Face Camera
    This will force all the strands to face the camera, the user can specify the camera to follow (Optional).
  • Orient Based On Strand Shape
    If this option is on, all the strands will face towards the distribution surface.
  • Angle
    Defines the rotation angle of the strands. You can use a map to control this parameter using the Global Angle Multiplier slot. A texture map can be used to control this parameter.
  • Chaos
    This is a randomness control for the rotation. A texture map can be used to control this parameter.
  • Twist
    Specifies the angle value, relative to the global rotation, at the tip of each strand. This allows to add twisting to strands around their stem.