TYPE: POP
TITLE: Fan POP

The Fan POP applies forces on the particles as if a cone shaped
fan were acting on it. The fan has an origin and applies forces 
radially from its center. Local variables are usable in parameters
denoted with a *. 

This POP modifies the following attributes: accel.

Parameters:
    Activation       - Turns the POP on and off			/activate
    Source Group     - Subset of points to act on
Fan
    Force Object   - Path to the Force Object to override POP parameter values
    Angle          - Angle from direction for which the 
                     fan has maximum intensity			/angle
    Delta          - Angle outside the fan angle through which
                     the intensity drops from maximum to zero	/delta
    Rolloff        - Rate of dropoff in delta angle		/rolloff
    Maximum Distance - A particle farther away than this distance
                       will not be affected (0 for all particles) /maxdistance
    *Strength       - Strength of the fan 			/strength
    *Scale          - Scaling factor for total force		/scale
    Show fan in guide - show fan as guide geo
    Guide Scale    - Scale factor for fan guide geo		/guidescale
    Show acceleration in guide - show particle acceleration as guide geo
Location
    Reference      - Transform space to interpret origin
    Object         - Object when using referenced object
    Origin         - Origin position		/originx /originy /originz
    Direction      - Fan direction 			/dirx /diry /dirz
Defaults
    Ignore Mass    - Ignore particle mass 
    Override Mass  - Override particle mass
    *Mass          - Mass to use for override			/mass
Noise
    *Seed       - Seed for random turbulence generator 		/seed
    *Turbulence - # of iterations to add fractional noise	/turb
    *Roughness  - Scale of noise added with each iteration	/rough
    *Exponent   - Noise attenuation				/atten
    *Frequency  - Spatial frequency of noise field	/freqx /freqy /freqz
    *Amplitude  - Maximum value of noise field			/amp
    *Offset     - Amount to shift noise		/offsetx /offsety /offsetz
    Noise Type  - Noise type to generate	

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

See Also: Attractor, Force, Wind
