TYPE: POP
TITLE: Rotation POP

The Rotation POP can be used to apply an arbitrary rotation to the
particle frame of reference. The particle's velocity and up vector define 
the frame of reference on the particle. The rotation is applied to 
this reference and defines how instanced geometry will be oriented
on the particle. The rotation axis can be evaluated either in component 
form or as a vector.

This POP modifies the following attributes: rot.

Parameters:
    Activation          - Turns the POP on and off	/activate
    Source Group        - Subset of points to act on
    Apply Motion        - Type of points to apply rotation to
    Angle               - Angle to rotate		/rotangle
    Axis                - Axis about which to rotate	/rotx /roty /rotz

Local Variables 
    Overview - The standard local variables are usable in this POP.  Please
               refer to the Houdini manual for more details.
