TYPE: POP
TITLE: SoftLimit POP

The SoftLimit POP creates a spongy boundary object which particles
can bounce off.

Parameters:
    Activation     - Turns the POP on and off                        /activate
    Source Group   - Subset of points to act on
    Type           - Shape of object to bounce on
    +Limit         - positive object value    /limitposx /limitposy /limitposz
    -Limit         - negative object value    /limitnegx /limitnegy /limitnegz
    Behavior       - Whether the sponge will try to keep particles
                     inside itself, or keep them outside of itself.
    Force          - The constant force that should be applied in the shortest 
                     direction out of the sponge.                       /force
    Dampening      - The force is reduced by the component of the particle's 
                     velocity traveling out of the sponge.  It is increased 
                     by the component traveling into the sponge.  This is 
                     the scale to adjust that computation.  The total force is 
                     never negative.                                   /vscale
    Ignore Mass    - Ignore particle mass
    Override Mass  - Override particle mass
    Mass           - Mass to use for override                            /mass

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

See Also: Collision, Limit
