TYPE: POP
TITLE: Property POP

The Property POP can be used to change a particle's properties like mass, 
drag, charge or which attractor point to move towards. By itself, this POP 
will not affect particle behavior. The attributes are only useful when 
used in combination with some of the modifier POPs like Force, Wind, Drag, 
Follow, Orbit or Attractor. The POP will add the attribute if it doesn't 
exist already.

This POP modifies the following attributes: attract, charge, drag, follow, 
mass, oaxis, ocenter, ocntrid, oradius, ospeed and pscale.

Parameters:
    Activation          - Turns the POP on and off		/activate
    Source Group        - Subset of points to act on
Physical
    Mass                - Mass					/mass
    Center of Mass      - relative position of particle center of mass
    Bounce              - bounce coefficient
    Dynamic Friction    - friction between two moving rigid body particles
    Static Friction     - friction between two stationary rigid body particles
Orbit
    Axis                - the normal to the orbit plane		/oaxisx /oaxisy /oaxisz
    Center              - the center of orbit			/ocenterx /ocentery /ocenterz
    Radius              - the radius of the orbit in units	/oradius
    Speed               - the speed of the orbit in RPM		/ospeed
    Orbit Index         - the ID of the point in the 		/ocntrid
                          "Center Group" to be used as 
                          the center of orbit 
Misc
    Follow Index        - Which particle to follow		/follow
    Attractor Point     - Attractor point to move towards	/attract
    Charge              - Positive/negative charge		/charge
    Scale               - Particle scale			/scale
    Drag                - Drag					/drag
    Cling               - Cling factor for sliding particles	/cling

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