xpBlend General tab menu.
Check this box to enable the xpBlend modifier.
Independent is the default setting.
Alternatively, you can change this to Action-Controlled.
In this mode, particles will be affected if they come into the field of effect of the modifier.
When in the Action-Controlled Mode setting, the modifier will only act on a particle when told to do so by an action.
A particle’s properties will only be blended with its neighbor’s if the particles are within this Distance value.
Higher Distance settings will result in greater blending and lower settings will mean there is less blending.